Basler Electric BE1-BPR User Manual

INSTRUCTION MANUAL

FOR

BREAKER PROTECTION RELAY

BE1-BPR

P0052-90

Publication: 9272000990 Revision: J 04/12

INTRODUCTION

This instruction manual provides information about the operation and installation of the BE1-BPR Breaker Protection Relay. To accomplish this, the following information is provided:

 General Information and Specifications  Application  Human-Machine Interface  Functional Description  Installation and Maintenance  Calibration and Testing

WARNING!

To avoid personal injury or equipment damage, only qualified personnel should perform the procedures in this manual.

NOTE

Be sure that the BE1-BPR is hard-wired to earth ground with no smaller than 12 AWG copper wire attached to the ground terminal on the rear of the unit case. When the BE1-BPR is configured in a system with other devices, it is recommended to use a separate lead to the ground bus from each unit.

9272000990 Rev J BE1-BPR Introduction i

First Printing: December 1994

Printed in USA

April 2012

CONFIDENTIAL INFORMATION

of Basler Electric, Highland Illinois, USA. It is loaned for confidential use, subject to return on request, and with the mutual understanding that it will not be used in any manner detrimental to the interest of Basler Electric.

It is not the intention of this manual to cover all details and variations in equipment, nor does this manual provide data for every possible contingency regarding installation or operation. The availability and design of all features and options are subject to modification without notice. Should further information be required, contact Basler Electric.

BASLER ELECTRIC

12570 STATE ROUTE 143

HIGHLAND IL 62249 USA

http://www.basler.com, info@basler.com

PHONE +1 618.654.2341 FAX +1 618.654.2351

ii BE1-BPR Introduction 9272000990 Rev J

REVISION HISTORY

The following information provides a historical summary of the changes made to the BE1-BPR hardware and firmware. The corresponding revisions made to this instruction manual (9272000990) are also summarized. Revisions are listed in reverse chronological order.

Firmware

Version and Date

3.33, 07/11

3.32, 02/04

3.31, 02/02

3.30, 10/99

3.29, 06/99

3.27, 01/99

3.26, 11/98

3.23, 08/97

3.22, 02/97

3.21, 11/96

3.03, 06/96

3.02, 06/96

3.00, 12/94

 Improved production testing at the factory.  Corrected PW command operation when used with B, F, or R

command suffix.

 Eliminated fault log data errors.  Corrected HMI LCD flickering and the skipping of DIAG records when

certain diagnostic alarms are present.

 Corrected fault log data errors.  Corrected over-range display error for primary current above 10 Aac

and a CT ratio less than 99.

 Added POSC command.  Corrected operation of Ti parameter in BKRCON setting.  Implemented new device serial number format.  Added fourth password level for OUT command.

 Modified ACCESS command so that password access can be

obtained in multiple access areas simultaneously.

 Added ID screen to front panel HMI.  Removed extraneous text from settings reported by the SHOWSET

command.

 Changed time delay setting (TD command) range and recloser time

delay setting (TD79 command) range from 0 to 60 seconds to 10 milliseconds to 60 seconds. A setting of 0 disables the timer.

 Changed the minimum input contact recognition and debounce timer

(LI command) from 1 millisecond to 4 milliseconds.

 Corrected PHOLD command operation in regard to the recloser (79)

Close output.

 Improved pickup and dropout performance at very low pickup

settings.

 Added Model/Program screen to the list of Maintenance screens

available at the front panel HMI.

 Eliminated sporadic LO command errors.  Resolved communication errors during RS-485 multidrop operation.  Initial release

Change

Manual

Revision and Date

J, 04/12

H, 05/08

9272000990 Rev J BE1-BPR Introduction iii

 Minor text edits.  This revision letter not used.  Added information for model numbers 9272000328, 9272000329,

9272000330, and 9272000331.

 Updated Table 1-4, Contact Sensing Burden.

Change

Manual

Revision and Date

G, 01/08

F, 08/04

E, 12/98

D, 07/98

C, 01/96

B, 07/95

Change

 Added GOST-R to Section 1, General Information, Specifications.  Added manual part number and revision to footers.  Updated front panel drawings.

 Text was added to describe the contact sensing circuitry with jumper-

selectable turn-on and turn-off points. A procedure and diagram for configuring the contact sensing jumpers was added to Section 7.

 Power supply holdup time specification was increased.  Where applicable, drawings were modified to reflect new front panel

design for horizontal- and vertical- units.

 Figure 7-2 was changed to show revised mounting depth for the

horizontal-mount unit.

 Call-outs were added to Figure 7-5 to identify mounting hole locations

for vertical-mount units used in retrofit installations. M2 panel openings were added.

 More data about the IRIG input was added to Section 1, General

Information, and Section 7, Installation.

 POSC command and description was added to Section 4, Functional

Description.

 BKRCON command information was altered because of an expanded

Tc and Ti setting range.

 CTI parameter was removed from CT command text and all settings

lists.

 A note box discussing the need to modify older settings files for use

with newer versions of the BE1-BPR was added to Section 6, Communications.

 Diagrams and text were added to Section 5, BESTlogic

Programmable Logic, Contact Input Logic to better explain the

recognition and debounce settings of the LI command.

 A detailed table of contents was placed at the beginning of

appropriate sections. The table of contents at the beginning of the manual was simplified by listing only section numbers and titles.

 Manual style was updated.  Output relay pickup time for OUT1 was changed to 4 ms typical, 5 ms

maximum.

 Manual was revised to provide a more complete functional

description.

 Communication command information was summarized in table form

and missing command information was added.

 Panel drilling diagram of Figure 7-5 was updated and connection

diagram of Figure 7-13 was added.

 Appendix A, Terminal Emulation was added.  Testing procedures of Section 8, Calibration and Testing were

updated and clarified.

 The manual style was updated.  Revised manual to include added IRIG-B functions.  Made revisions throughout manual to reflect the vertical mounting

option. Added Figures 3-4, 7-3, 7-4, and 7-5.

 Minor corrections were made in Reclosing Mode and FLOG

Command.

 Corrected Figure 4-2.

iv BE1-BPR Introduction 9272000990 Rev J

Manual

Revision and Date

A, 04/95

—, 12/94

 Added a description of the reclosing functions.  Initial release

Change

9272000990 Rev J BE1-BPR Introduction v

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vi BE1-BPR Introduction 9272000990 Rev J

SECTION 1 • GENERAL INFORMATION ................................................................................................ 1-1

SECTION 2 • APPLICATION .................................................................................................................... 2-1

SECTION 3 • HUMAN-MACHINE INTERFACE ....................................................................................... 3-1

SECTION 4 • FUNCTIONAL DESCRIPTION ........................................................................................... 4-1

SECTION 5 • BESTlogic PROGRAMMABLE LOGIC ............................................................................... 5-1

SECTION 6 • COMMUNICATIONS .......................................................................................................... 6-1

SECTION 7 • INSTALLATION .................................................................................................................. 7-1

SECTION 8 • CALIBRATION AND TESTING .......................................................................................... 8-1

SECTION 9 • MAINTENANCE .................................................................................................................. 9-1

APPENDIX A • TERMINAL COMMUNICATION ....................................................................................... A-1

APPENDIX B • COMMAND SUMMARY ................................................................................................... B-1

APPENDIX C • RELAY SETTINGS RECORD ......................................................................................... C-1

9272000990 Rev J BE1-BPR Introduction vii

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viii BE1-BPR Introduction 9272000990 Rev J

SECTION 1 • GENERAL INFORMATION

TABLE OF CONTENTS

SECTION 1 • GENERAL INFORMATION ................................................................................................ 1-1

DESCRIPTION....................................................................................................................................... 1-1

APPLICATION - STANDARD MODELS ................................................................................................ 1-1

Breaker Failure ................................................................................................................................... 1-1

Breaker Reclosing .............................................................................................................................. 1-1

Timing Diagnostics ............................................................................................................................. 1-2

Breaker Arc Detector .......................................................................................................................... 1-3

IRIG Standard Time Format ............................................................................................................... 1-3

APPLICATION - ENHANCED MODELS ............................................................................................... 1-3

Breaker Contact Maintenance and Resistor Protection ..................................................................... 1-3

Fault Recording .................................................................................................................................. 1-4

MODEL NUMBERS ............................................................................................................................... 1-4

SPECIFICATIONS ................................................................................................................................. 1-4

Current Sensing ................................................................................................................................. 1-5

Current Detector Pickup Time ............................................................................................................ 1-5

Current Detector Dropout Time .......................................................................................................... 1-5

Current Pickup Range ........................................................................................................................ 1-5

Current Pickup Accuracy .................................................................................................................... 1-5

Sample Rate ....................................................................................................................................... 1-5

Oscillograph Recording Range .......................................................................................................... 1-5

Oscillograph Data Accuracy ............................................................................................................... 1-5

Oscillograph Recording Format.......................................................................................................... 1-6

Contact Sensing Input Recognition Time ........................................................................................... 1-6

Contact Sensing Input Range ............................................................................................................ 1-6

Contact Sensing Input Burden ........................................................................................................... 1-6

IRIG Input ........................................................................................................................................... 1-6

Timers ................................................................................................................................................. 1-6

Timer Accuracy .................................................................................................................................. 1-7

Real Time Clock Set Ability ................................................................................................................ 1-7

Real Time Clock Resolution ............................................................................................................... 1-7

Real Time Clock Stability ................................................................................................................... 1-7

Real Time Clock Accuracy ................................................................................................................. 1-7

BESTlogic Operate Time .................................................................................................................... 1-7

Output Relays ..................................................................................................................................... 1-7

Display ................................................................................................................................................ 1-7

Targets/Indicators ............................................................................................................................... 1-8

Keypad ............................................................................................................................................... 1-8

Communications ................................................................................................................................. 1-8

Power Supply ..................................................................................................................................... 1-8

Isolation .............................................................................................................................................. 1-8

Surge Withstand Capability ................................................................................................................ 1-8

Radio Frequency Interference (RFI) .................................................................................................. 1-9

Temperature ....................................................................................................................................... 1-9

Shock .................................................................................................................................................. 1-9

Vibration ............................................................................................................................................. 1-9

Gost-R Certification ............................................................................................................................ 1-9

Weight ................................................................................................................................................ 1-9

Figures

Figure 1-1. Breaker Failure Timing Diagram ............................................................................................. 1-3

9272000990 Rev J BE1-BPR General Information i

Tables

Table 1-1. BE1-BPR Relays, 5 Aac CT Secondary Table 1-2. BE1-BPR Relays, 1 Aac CT Secondary Table 1-3. Contact Sensing Turn-On Voltage Table 1-4. Contact Sensing Burden Table 1-5. Power Supply Specifications

................................................................................... 1-4

........................................................................................... 1-6

.......................................................................................................... 1-6

.................................................................................................... 1-8

ii BE1-BPR General Information 9272000990 Rev J

SECTION 1 • GENERAL INFORMATION

DESCRIPTION

BE1-BPR Breaker Protection Relays are three-phase and neutral, microprocessor based relays designed to provide power systems with protection and security against monitored breaker failure or to initiate multiple shot breaker reclosings.

These relays incorporate a powerful means of programming internal relay logic to satisfy a wide range of user requirements without making any relay hardware changes. Microprocessor based design provides the basic features of a programmable logic controller (PLC) combined with an instantaneous overcurrent module. Cased in a 19 inch rack-mount or a vertical panel mount, the relay offers installation versatility. A wide temperature, 2 lines by 16 character display provides diagnostic and setup information. Two RS-232 serial ports (one each front and rear) and one RS-485 serial port (rear) provide remote communication and relay control.

Built-in diagnostics and monitoring features provide information for both the health of the relay and the health of the breaker being monitored. Relay diagnostics include continuous background monitoring of the power supplies, analog-to-digital (A/D) converter, random-access memory (RAM), read-only memory (ROM), and electrically-erasable programmable ROM (EEPROM). A dedicated alarm (ALM) relay output provides power supply, microprocessor, and software alarm status. Breaker diagnostics include a timing diagnostic log, breaker contact duty monitoring, breaker resistor protection, and breaker arc detection. Other monitoring features include oscillographic fault records and fault summary logs. BE1-BPR relays use the Inter-Range Instrumentation Group (IRIG), Format B for high timing accuracy and resolution.

APPLICATION - STANDARD MODELS

Breaker Failure

BE1-BPR relays are intended to provide a preprogrammed solution for most breaker failure relaying applications. Breaker failure relaying is the use of a current monitoring relay to determine whether or not current continues to flow into a faulted circuit after a breaker has been instructed to interrupt the circuit. If current continues to flow into the faulted circuit after a defined period of time has elapsed (sufficient for the breaker to have interrupted the current), the circuit breaker is considered to have failed. Steps must then be taken to trip the next set of breakers in the power system to prevent system damage. Breaker failure schemes must be designed to isolate both the faulted circuit and the failed breaker.

Several reasons why a breaker fails to clear a fault are:

• Trip circuit is open (broken wire, blown fuse, open trip coil).

• Interrupting mechanism stuck, leaving a single phase of a three-phase circuit connected.

• Interrupter flash-over due to the loss of dielectric strength through contamination or damage.

• Operating mechanism failed to operate.

Breaker failure relays detect these conditions and initiate backup procedures.

Breaker failure relays are applied on a per breaker basis. That is, one breaker failure relay for each breaker in the substation. BE1-BPR relay outputs must be arranged to initiate the tripping of all the circuit breakers necessary to isolate the fault if the protected circuit breaker fails to operate. The relay may also need to initiate transfer tripping of remote breakers to accomplish this task. Transfer tripping of the remote line end for a breaker failure should also block reclosing of the remote circuit breakers. External lockout relays are typically used to trip and block reclosing of the backup breakers because they normally require a positive operator action to reset them.

Typically, breaker failure protection is applied to transmission and sub-transmission systems. However, breaker failure protection may be applied to any portion of the power system where failure of a circuit breaker to operate properly could result in severe system damage or instability. Breaker failure protection can also be used to selectively clear a failed breaker in a station with multiple buses without clearing the entire station.

Breaker Reclosing

BE1-BPR relays can be configured as multiple shot reclosing relays that operate in parallel and independently from the breaker failure function.

9272000990 Rev J BE1-BPR General Information 1-1

Three major factors should be considered when establishing a reclosing philosophy.

• Desired number or reclosure attempts.

• Time delay between breaker opening and reclosure.

• Supervisory control.

The first major factor is the desired number of reclosure attempts. Where most faults are attributable to heavy tree exposure, as in distribution networks, multiple reclosure attempts are common. This is possible because of low voltage levels and is desirable considering customer inconvenience during outages. BE1-BPR relays are programmable for up to three reclosure attempts per sequence. This allows tailoring of the reclosing sequence to the specific needs of the circuit.

The second major factor is the time delay between breaker opening and reclosure. On sub-transmission and distribution networks, it is necessary to ensure that motors are no longer running and that local generation is off-line prior to attempting reclosure. At the same time, a rapid reclosure minimizes damage, ionization, and system shock in transmission networks. After the first reclosure attempt, additional attempts are generally delayed to allow for de-ionization of the interrupter. BE1-BPR relays have three reclosing shots and each shot has a programmable time delay. Three outputs are available. They are CLOSE, RECLOSE FAIL, and LOCKOUT.

A third major factor to be considered in reclosing is supervisory control. Supervisory control allows the operator to maintain control of the system at all times. BE1-BPR relays have two supervisory inputs (WAIT and LOCKOUT). WAIT stops the reclose sequence at any point and allows the sequence to continue when the WAIT input is removed. LOCKOUT drives the reclose function immediately to lockout status and takes precedence over all other inputs.

Timing Diagnostics

To perform the typical breaker failure operation previously described, the breaker failure relay must be informed by a breaker failure initiate (BFI) contact that the breaker is being opened. One or more timers, in conjunction with the overcurrent element, determine if the breaker failure output (BFO) picks up.

Typically one or more delay timers are used to delay the BFO until the primary protection scheme has had enough time to operate. A control timer may be also be used to turn off the BFO after the backup protection has had enough time to operate.

Calculation of the correct timer values is an important part of setting up the relay. You must know how long it takes for the internal and external devices to operate. Typical timing sequences are listed in the following paragraphs and shown in Figure 1-1. Parentheses in the listed timing information indicate related times in Figure 1-1. Specific timing data for BE1-BPR relays is provided in the latter part of this section.

Normal Breaker Operation Required Timing Information

(1) Time for protective relays to operate — (this includes sending a trip signal to the breaker and

sending a BFI signal to the BE1-BPR). (2) Time required for the breaker to open. (3) Time required for the BE1-BPR overcurrent detector to drop out. (4) Margin to allow for variations in normal sequence timing plus a safety factor. (12) Control timer setting = the length of time to maintain the breaker failure operating window. Control

timer setting must coordinate with the high speed reclose delay (13). (13) Time to allow for arc de-ionization.

Failed Breaker Operation Required Timing Information

(5) Time for the BFI overcurrent detector to pickup. (6) Time required for the BFI contact to be recognized by the BE1-BPR. (7) Time for the BF logic to operate. (8) Time for the BFO relay to operate. (9) Time for the external lockout relay to pickup. (10) Time for the backup breakers to operate. (11) Delay timer setting = the sum of (breaker operate time (2) + BF current detector dropout time (3) +

margin (4)) minus BFI contact pickup time (6).

1-2 BE1-BPR General Information 9272000990 Rev J

Figure 1-1. Breaker Failure Timing Diagram

Because timing is such an important part of breaker failure protection, the BE1-BPR relay provides timing diagnostics to assist in determining if the timer settings are optimal and to allow other aspects of the protection system to be checked. This timing diagnostic is a Timer Log or TLOG. An example of its use is to create a log of the margin remaining between when a fault is cleared and when a breaker failure would occur. After a normal breaker operation clears a fault, the time remaining from when the BE1-BPR overcurrent fault detector drops out and the breaker failure delay timer would have timed out is the MARGIN. This time can be recorded by saving the time left on the delay timer when the fault detector drops out by using the program timer log alarm (PTLOG) command. The time logged will correspond to the MARGIN value in Figure 1-1. If there is a discrepancy between the calculated and actual margin value stored in the TLOG, corrective action can be taken to correct the protection timing before a serious problem occurs. If the MARGIN is too small or too large, the delay timer setting can be adjusted for optimal operation. The PTLOG command also allows an alarm time to be programmed so that if the MARGIN drops below a pre-determined value, the Alarm output (ALM) can be automatically closed to signal the operator that immediate attention is required. Timing diagnostics can be programmed for each of the six timers available.

Breaker Arc Detector

An important breaker diagnostic feature is the detection of low level arcing across an open breaker (flashover). Flashover might occur because lightning struck and a surge suppressor failed or air pressure in an air blast circuit breaker is lost. If left undetected, severe damage to the breaker contacts could result. BE1-BPR relays can detect this type of fault using an extra low level phase overcurrent pickup and a long moving average filter. These features have been provided as standard features in the BE1-BPR relays. Used with the programmable logic, a breaker arc detector can be programmed to provide a breaker close output to close the breaker and extinguish the arc. Additional interlocks may be added to the logic to inhibit the breaker close signal if the breaker is isolating a faulted line.

IRIG Standard Time Format

The IRIG function allows the BE1-BPR relay to synchronize the on-board real time clock with a standard IRIG demodulated time signal. Synchronization is automatic and the BE1-BPR initiates synchronization at regular intervals (approximately 20 seconds) in order to maintain the one millisecond overall accuracy.

APPLICATION - ENHANCED MODELS

Enhanced BE1-BPR models have all of the features of standard models plus the additional features described in the following paragraphs.

Breaker Contact Maintenance and Resistor Protection

Enhanced model BE1-BPR relays can perform two protection diagnostic functions other than the breaker failure function. One, they can estimate breaker contact duty (wear) and signal when preventative maintenance is needed. Two, they can estimate breaker opening resistor heating and provide a block reclose signal to protect the breaker resistor when the resistor heating could exceed the maximum resistor rating.

9272000990 Rev J BE1-BPR General Information 1-3

Fault Recording

Enhanced model BE1-BPR relays can also be configured to record and save digital fault data for all three phases plus neutral (0 to 200 amperes) and the digital state of each input and output contact. Analog waveforms are digitized by sampling the waveforms at a periodic rate and converting the measured signals to digital values. When a fault occurs, the digital data is stored as a fault record. Multiple fault records can be stored and recalled through the serial port by an operator. To display the fault waveform for analysis, recalled data can be imported into a data base file and converted into a graph. Standard programs that read and display ASCII data (in accordance with IEEE Standard Common Format for Transient Data Exchange (COMTRADE) for Power Systems) can also be used. BESTView application software provides a simple terminal interface to communicate with the relay, retrieve and display COMTRADE oscillographic fault data, and provide a remote front panel interface. This software is not required to communicate with the relay. However, it combines the functions of a number of separate packages into one program that is optimized for the BE1-BPR relay. To order this software free of charge, contact the Customer Service Department of the Power Systems Group, Basler Electric, and request the BESTView Software Package.

MODEL NUMBERS

Tables 1-1 and 1-2 provide information for the nominal current input to the current transformers, part number, options, mounting style, and operating power supply voltage. Standard BE1-BPR relays do not have oscillography, fault records, contact duty logs, or two calibration levels (current metering is limited to 10 amperes).

Table 1-1. BE1-BPR Relays, 5 Aac CT Secondary

Part Number Options Mounting Style IRIG Power Supply

9272000300 Standard 19” Rack Mount Yes 48/125 Vac/Vdc

9272000301 Standard 19” Rack Mount Yes 125/250 Vac/Vdc

9272000302 Enhanced 19” Rack Mount Yes 48/125 Vac/Vdc

9272000303 Enhanced 19” Rack Mount Yes 125/250 Vac/Vdc

9272000309 Standard Vertical Mount Yes 48/125 Vac/Vdc

9272000310 Standard Vertical Mount Yes 125/250 Vac/Vdc

9272000311 Enhanced Vertical Mount Yes 48/125 Vac/Vdc

9272000312 Enhanced Vertical Mount Yes 125/250 Vac/Vdc

9272000328 Enhanced Vertical Mount Yes 48/125 Vac/Vdc

9272000329 Enhanced 19” Rack Mount Yes 48/125 Vac/Vdc

9272000330 Enhanced Vertical Mount Yes 125/250 Vac/Vdc

9272000331 Enhanced 19” Rack Mount Yes 125/250 Vac/Vdc

Table 1-2. BE1-BPR Relays, 1 Aac CT Secondary

Part Number Options Mounting Style IRIG Power Supply

9272000304 Standard 19” Rack Mount Yes 48/125 Vac/Vdc

9272000305 Standard 19” Rack Mount Yes 125/250 Vac/Vdc

9272000306 Enhanced 19” Rack Mount Yes 48/125 Vac/Vdc

9272000307 Enhanced 19” Rack Mount Yes 125/250 Vac/Vdc

SPECIFICATIONS

BE1-BPR Breaker Protection Relays have the following features and capabilities.

1-4 BE1-BPR General Information 9272000990 Rev J

Current Sensing

Four isolated inputs with a maximum burden of less than 0.1 ohm.

5 Ampere CT: Maximum continuous current: 20 Aac Maximum one second current: 500 Aac

1 Ampere CT: Maximum continuous current: 4 Aac Maximum one second current: 80 Aac

Current Detector Pickup Time

Instantaneous Fault Detector (50/60 Hz RMS Filter Type 1 and 3)

1 ¼ cycle maximum for current 125% greater than pickup.

Moving Average Window Fault Detector (50/60 Hz RMS Filter Type 2)

Maximum pickup time is (Window_size/C_PM + 1 ¼ (cy)), where Window_size = Filter window size in cycles (Range 1 - 100) and C_PM = Current Pickup Multiple

Current Detector Dropout Time

Instantaneous Fault Detector (50/60 Hz RMS Filter Type 1 and 3)

Dropout/pickup ratio: 90%, typical. One-quarter cycle (4.2 milliseconds @ 60 hertz) from the time the current falls below and stays below 25% of the RMS level or 1 ¼ cycle from the time the RMS current signal decreases to less than 75% of pickup.

Moving Average Window Fault Detector (50/60 Hz RMS Filter Type 2)

Maximum dropout time is (Window_size-(Window_size/C_PM) + 1 ¼ (cy)), where Window_size = Filter window size in cycles (Range 1 - 100) and C_PM = Current Pickup Multiple level before dropout.

Current Pickup Range

Three independent settings, selectable as three-phase or neutral.

Instantaneous Fault Detector (50/60 Hz RMS Filter Type 1 and 3)

5 ampere CT: 0.25 to 9.99 amperes selectable in 0.01 increments 1 ampere CT: 0.05 to 2.00 amperes selectable in 0.01 increments

Moving Average Window Fault Detector (50/60 Hz RMS Filter Type 2)

5 ampere CT: 0.05 to 1.00 amperes selectable in 0.01 increments 1 ampere CT: 0.01 to 0.20 amperes selectable in 0.01 increments

Current Pickup Accuracy

Instantaneous Fault Detector (50/60 Hz RMS Filter Type 1 and 3)

5 ampere CT: ±2% of pickup setting or ±0.05 Aac (whichever is greater) 1 ampere CT: ±2% of pickup setting or ±0.01 Aac (whichever is greater)

Moving Average Window Fault Detector (50/60 Hz RMS Filter Type 2):

5 ampere CT: ±25% with window of 10 cycles or larger 1 ampere CT: ±25% with window of 10 cycles or larger

Sample Rate

12 samples per cycle (720 samples per second at 60 hertz, 600 samples per second at 50 hertz).

Oscillograph Recording Range

5 ampere CT: 0 - 200 amperes, rms 1 ampere CT: 0 - 40 amperes, rms

Oscillograph Data Accuracy

±0.2% of full scale or 5% of reading, whichever is greater

9272000990 Rev J BE1-BPR General Information 1-5

Oscillograph Recording Format

IEEE C37.111-1991, IEEE Standard Common Format for Transient Data Exchange (COMTRADE) for Power Systems.

Contact Sensing Input Recognition Time

User programmable 4 - 255 milliseconds ±0.01% of setting to closest sample time (one-twelfth cycle = 1.4 milliseconds at 60 hertz or 1.7 milliseconds at 50 hertz).

Contact Sensing Input Range

Energizing levels for contact sensing inputs are jumper selectable. Table 1-3 lists the turn-on range for each control voltage range and jumper position. Refer to Section 7, Installation, Contact Sensing Inputs, for jumper location.

Table 1-3. Contact Sensing Turn-On Voltage

Turn-On Range

Nominal Control Voltage

48/125 Vac/Vdc 26 V to 38 V 69 V to 100 V

125/250 Vac/Vdc 69 V to 100 V 138 V to 200 V

(JP200 through JP206)

Pin 1 - Pin 2 Pin 2 - Pin 3

Contact Sensing Input Burden

Burden per contact for sensing depends on the power supply model and the input voltage. The input sensing range is the same as the dc power supply range. Table 1-4 provides appropriate burden specifications.

Table 1-4. Contact Sensing Burden

Turn-On Range

Nominal Control Voltage

48/125 Vac/Vdc

125/250 Vac/Vdc

IRIG Input

Signal: The IRIG input accepts a demodulated (dc level-shifted) signal.

Maximum input signal level is 25 volts.

Burden: Burden is nonlinear and rated at 4 kΩ at 5 Vdc.

Timers

Standard (TD[n]): Six microprocessor controlled timers. Programmable in milliseconds,

seconds, or cycles. Ranges and increments are: 10 to 999 milliseconds in 1 millisecond increments; 1 to 60 seconds in 0.1 second increments; or 1 to 3,600 cycles in 1 cycle increments. A setting of 0 will disable the timer. If programmed in cycles, the BE1-BPR relay will display the equivalent time in milliseconds.

Reclosing (TD79[n]): Six microprocessor controlled timers. Programmable in milliseconds,

seconds, or cycles. Ranges and increments are: 10 to 999 milliseconds in 1 millisecond increments; 1 to 99 seconds in 0.1 second increments; 100 to 600 seconds in 1 second increments; or 1 to 9,999 in 1 cycle increments.

(JP200 through JP206)

Pin 1 - Pin 2 Pin 2 - Pin 3

16 kΩ 28 kΩ 56 kΩ 92 kΩ

1-6 BE1-BPR General Information 9272000990 Rev J

Timer Accuracy

Standard (TD[n]): +4 and -1 milliseconds ±0.01% of setting Reclosing (TD79[n]): +20 and -1 milliseconds ±0.01% of setting

Real Time Clock Set Ability

±1 second

Real Time Clock Resolution

±1 second

Real Time Clock Stability

±30 ppm typical

Real Time Clock Accuracy

Relays with IRIG, ±1 millisecond. If IRIG signal is lost, accuracy defaults to the real time clock stability.

BESTlogic Operate Time

Operate time is 1.4 milliseconds typical, 2.8 milliseconds maximum at 60 hertz.

Output Relays

Any output contact closed by the relay logic will be held closed for 200 to 250 milliseconds even if the initial cause of the closing goes away. After 200 to 250 milliseconds, the relay close time is determined by the state of the relay logic. This minimum hold time may be disabled by using the PHOLD command.

Factory Presets ALARM Output: Output contacts close when ALARM logic (LOA) is true or power is lost.

Outputs 1 - 5: Output contacts close when the corresponding logic equation (LO1 -

LO5) is true.

Pickup Time (All models except 9272000328, 9272000329, 9272000330, and 9272000331)

ALARM: 8 milliseconds typical, 10 milliseconds maximum OUTPUT 1: 4 milliseconds typical, 5 milliseconds maximum OUTPUT 2, 3, 4, 5: 8 milliseconds typical, 10 milliseconds maximum

Pickup Time (Models 9272000328, 9272000329, 9272000330, and 9272000331 only) ALARM: 8 milliseconds typical, 10 milliseconds maximum

OUTPUT 1, 2: 4 milliseconds typical, 5 milliseconds maximum OUTPUT 3, 4, 5: 8 milliseconds typical, 10 milliseconds maximum

Resistive Ratings 120 Vac: Make, break, and carry 7 Aac continuously

250 Vdc: Make and carry 30 Adc for 0.2 s, carry 7 Adc continuously,

break 0.3 Adc

500 Vdc: Make and carry 15 Adc for 0.2 s, carry 7 Adc continuously,

break 0.3 Adc

Inductive Ratings

120 Vac, 125/250 Vdc: Break 0.3 A (L/R = 0.04)

Display

Two-line, 16 character alphanumeric LCD (liquid crystal display) with LED (light emitting diode) backlight. Operating Temperature: -40°C to +70°C (-40°F to +158°F)

Display contrast may be impaired at temperatures below -20°C (-4°F).

9272000990 Rev J BE1-BPR General Information 1-7

Targets/Indicators

Five diagnostic LED indicators are provided.

POWER: Green LED (normally ON) to indicate power supply is operating. CLOCK: Green LED (normally OFF) turns ON to indicate that the clock needs to

be set.

50PU: Red LED (normally OFF) turns ON to indicate one or more of the inputs

has exceeded the pickup level(s).

ALARM: Red LED (normally OFF) turns ON to indicate problems. Output A

(ALARM) de-energizes (closes) when ALARM LED is ON.

TARGET: Red LED (normally OFF) turns ON if one or more of the relay outputs

has been energized. (If programmed by the PTARGET command.)

Keypad

Five keys are used to access information on the display and enter settings.

Communications

Only one communication port can be active at any time.

Front panel connector: RS-232, 9-pin, female, D-sub DCE Rear panel connectors: RS-232, 9-pin, female, D-sub DCE RS-485, 3-position terminal block Baud Rate: 300, 600, 1200, 2400, 4800, 9600, and 19200 Buffer Size: 40 characters Protocol: ASCII and binary data transmissions

Power Supply

Power for the internal circuitry may be derived from ac or dc external power sources. Power supply data is provided in Table 1-5.

Table 1-5. Power Supply Specifications

Power Supply

Range

48/125 V 48 Vdc

125/250 V 125 Vdc

Isolation

All output and power supply terminals have MOV suppressors. Maximum applied voltage must be no greater than 300 volts where MOV suppressors are used. Surge suppression capacitors are installed between terminal pairs and between terminals and chassis ground. When testing with 1,500 Vac, leakage current (approximately 8 milliamperes per terminal) is expected. 1.500 Vac (RMS) at 45 to 65 hertz for one minute or 2,121 Vdc may be applied between circuit groups, and between circuit group and chassis ground in accordance with IEC 255-5 and ANSI/IEEE C37.90-1989 (Dielectric Tests).

Nominal Input

Voltage

125 Vdc 120 Vac

120 Vac 250 Vdc 240 Vac

Input Voltage

Range

40 to 60 Vdc

90 to 150 Vdc

100 to 130 Vac

90 to 150 Vdc 100 to 130 Vac 180 to 300 Vdc 200 to 260 Vac

Burden at Nominal

(Maximum)

8 W (10 W) 8 W (10 W) 8 W (10 W)

8 W (10 W) 8 W (10 W) 8 W (10 W) 8 W (10 W)

Surge Withstand Capability

Qualified to ANSI/IEEE C37.90.1-1989, Standard Surge Withstand Capability (SWC) Tests for Protective Relays and Relay Systems. Note: This qualification does not include the front RS-232 communication

port.

1-8 BE1-BPR General Information 9272000990 Rev J

Radio Frequency Interference (RFI)

Field tested using a 5 W, hand-held transceiver operating at random frequencies centered around 144 MHz and 440 MHz, with the antenna located six inches from the relay in both horizontal and vertical planes.

Temperature

Operating: -40°C to +70°C (-40°F to +158°F) Storage: -40°C to +70°C (-40°F to +158°F)

Shock

Type tested to withstand 15 G in each of three mutually perpendicular planes, swept over the range of 10 to 500 Hz for a total of 6 sweeps; 15 minutes each sweep, without structural damage or degradation of performance.

Vibration

Type tested to withstand 2 G in each of three mutually perpendicular planes, swept over the range of 10 to 500 Hz for a total of 6 sweeps; 15 minutes each sweep, without structural damage or degradation of performance.

Gost-R Certification

Gost-R certified, No. POCC US.ME05.B03391; complies with the relevant standards of Gosstandart of Russia. Issued by accredited certification body POCC RU.0001.11ME05.

Weight

12 lb (5.44 kg) maximum

9272000990 Rev J BE1-BPR General Information 1-9

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1-10 BE1-BPR General Information 9272000990 Rev J

SECTION 2 • APPLICATION

TABLE OF CONTENTS

SECTION 2 • APPLICATION .................................................................................................................... 2-1

GENERAL .............................................................................................................................................. 2-1

APPLICATION DATA ............................................................................................................................. 2-1

Contact Sensing Inputs ...................................................................................................................... 2-1

Fault Detectors ................................................................................................................................... 2-1

General Purpose Timers .................................................................................................................... 2-5

Reclosing Timers ................................................................................................................................ 2-6

Output Contacts ................................................................................................................................. 2-7

Trip Circuit Monitor Logic ................................................................................................................... 2-7

Breaker Arc Detector .......................................................................................................................... 2-9

Breaker Resistor Protection ............................................................................................................. 2-10

Breaker Failure Protection with Pre-Insertion Resistors .................................................................. 2-11

Breaker Contact Duty Log ................................................................................................................ 2-11

Reclosing Functions ......................................................................................................................... 2-12

PREPROGRAMMED LOGIC DESCRIPTION ..................................................................................... 2-12

Breaker Failure Logic 1 for Standard Relays (BFL1) ....................................................................... 2-12

Breaker Failure Logic 2 for Standard Relays (BFL2) ....................................................................... 2-13

Breaker Failure Logic 3 for Standard Relays (BFL3) ....................................................................... 2-14

Breaker Failure Logic 1 for Enhanced Relays (BFL1E) ................................................................... 2-15

Breaker Failure Logic 2 for Enhanced Relays (BFL2E) ................................................................... 2-17

Breaker Failure Logic 3 for Enhanced Relays (BFL3E) ................................................................... 2-18

Figures

Figure 2-1. Maximum Instantaneous Pickup Timing ................................................................................. 2-2

Figure 2-2. Maximum Instantaneous Dropout Timing ............................................................................... 2-3

Figure 2-3. Maximum Pickup Timing with 10 Cycle MAF FD .................................................................... 2-3

Figure 2-4. Maximum Dropout Timing with 10 Cycle MAF Fault Detector

Figure 2-5. Multiple Breaker Arrangement ................................................................................................ 2-5

Figure 2-6. Delay Timer Operation ............................................................................................................ 2-5

Figure 2-7. Control Timer Operation .......................................................................................................... 2-6

Figure 2-8. Trip Circuit Monitor Schematic Diagram ................................................................................. 2-8

Figure 2-9. Trip Circuit Monitor Logic Diagram ......................................................................................... 2-8

Figure 2-10. Trip Circuit Monitor Timing Diagram ..................................................................................... 2-8

Figure 2-11. Trip Circuit Monitor with BFI Sensing .................................................................................... 2-9

Figure 2-12. Breaker Arc Detector Circuits ............................................................................................. 2-10

Figure 2-13. Breaker Resistor Protection Circuits ................................................................................... 2-10

Figure 2-14. Breaker Contact Duty Log Circuits ...................................................................................... 2-11

Figure 2-15. Reclosing Logic Circuit ........................................................................................................ 2-12

................................................ 2-4

9272000990 Rev J BE1-BPR Application i

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ii BE1-BPR Application 9272000990 Rev J

SECTION 2 • APPLICATION

GENERAL

BE1-BPR relays have seven inputs and five outputs plus an alarm output. There are three general purpose overcurrent fault detectors, six multipurpose timers, a three-shot recloser, and special outputs that are internally generated by the microprocessor. Using simple Boolean expressions, the user can logically connect the various functional blocks to create a custom, application specific, logic scheme to handle special protection requirements.

Standard model relays have the following special features:

• Three shot recloser.

• Pre-insertion breaker resistor operations counter with programmable reset and block reclose signal.

• Six configurable timing diagnostic logs each with an optional alarm setting. This feature can be used

to monitor the various protection system parameters such as the margin between normal breaker operation and breaker fail.

Enhanced model relays have the standard model features plus these special features:

• Twelve entry fault log detailing the system and relay status at the time the fault trigger occurred

• Twelve entry COMTRADE fault record consisting of configuration (CFG) and data (DAT) files. The

COMTRADE data contains 4 cycles of pre-fault and 16 cycles of post-fault data sampled at 12 samples per cycle. Each sample consists of the analog-to-digital converter values for each current channel as well as 32 digital channels (a digital channel is for the digital status of an input, output, or alarm).

• Integrated I

t breaker contact duty monitor with alarm.

A minimum of three basic breaker failure schemes are pre-programmed into nonvolatile memory. These schemes take full advantage of the special features available in this relay without requiring the user to do any programming. The user only selects the scheme desired and enters the pickup and timer settings.

APPLICATION DATA

Contact Sensing Inputs

Each BE1-BPR relay provides seven opto-isolated contact sensing inputs. Three inputs (IN1-3) are each completely isolated. Inputs 4 and 5 (IN4, IN5) share one common terminal and inputs 6 and 7 (IN6, IN7) share another common terminal. Each input has programmable recognition and debounce (time allowed for the external contacts to stabilize) times. Typically the default setting of four milliseconds recognition and twelve millisecond debounce should be used unless extremely slow or irregular contacts are applied. The default setting assures that the signal be present on at least two consecutive scans of the input status before recognition can occur.

It is recommended that for protective functions, a positive TRUE logic be used to enable protective outputs. This prevents a broken wire or loose connection from causing a protective trip. For example, a 52b input would be preferred for protection logic that is enabled when the breaker opens (i.e. block reclose or breaker arcing/flash over) and a 52a input would be preferred for protection logic that should be enabled when the breaker closes. On the other hand, for a diagnostic alarm, a negative TRUE logic may be preferred since it will give an alarm if the checked diagnostic occurs and also give an alarm (depending on the logic) for a bad or broken connection.

Fault Detectors

BPR relays provide three independent fault detectors. Each fault detector can be programmed for phase or neutral input sensing. Also, each fault detector can be setup to operate as an instantaneous (50) or moving average filter (MAF) fault detector.

Instantaneous (50) Fault Detector Type 1

An instantaneous fault detector provides a typical one cycle pickup and one-quarter cycle dropout for high speed operation. A three cycle software delay is imposed on any Type 1 fault detector when the current

9272000990 Rev J BE1-BPR Application 2-1

level is less than 40 milliamperes above the pickup setting. This prevents noise induced trips from

1.05 1.25 2 5 20 40

MULTIPLES OF PICKUP

MAX. PICKUP TIME (ms)

PU=5.00A

PU=0.25A

PU=9.99A

D2838-21

occurring. The Type 1 is used in BF logic schemes and is programmed by setting the fault detector logic (LF) type to PI (phase overcurrent) or NI (neutral overcurrent) and the digital filter selection to 1.

For the fault detector to pickup, the RMS value of the last cycle of current must be above the pickup setting. Due to the analog input circuitry design, the RMS value is clamped (limited) at approximately 13 amperes. As the multiple of pickup level increases, the pickup time decreases. Because of the limiting above 13 amperes, the pickup time does not appreciably decrease at high multiples of pickup. Also, the pickup may be delayed up to one-quarter cycle because the RMS current is calculated every quarter cycle. However, in no case will the pickup be slower than one and one-quarter cycles.

Figure 2-1 shows maximum pickup timing versus current input levels.

Figure 2-1. Maximum Instantaneous Pickup Timing

For the Type 1 fault detector to dropout, one of two conditions must occur. One, three sequential analogto-digital (A/D) samples must be less than one-fourth of the RMS current level for the last quarter-cycle calculation. Two, the RMS current signal level must decrease to less than 75% of pickup. Samples are made twelve times per line cycle and RMS current is calculated four times per line cycle. Three samples are used to compensate for zero crossings and noise. A short dropout delay is advantageous for BF logic in order to allow for the minimum timing margin in critical applications.

Figure 2-2 shows maximum dropout timing versus current input levels.

2-2 BE1-BPR Application 9272000990 Rev J

1.05 1.25 2 5 20 40

MULTIPLES OF PICKUP BEFORE DROP OUT

MAX. DROPOUT TIME (ms)

PU=9.99A

PU=5.00A

PU=0.25A

PU=9.99A

PU=5.00A

PU=0.25A

D2838-22

100

120

140

160

180

1.05 1.25 2 5 20 40

MULTIPLES OF

PICKUP

MAX. PICKUP TIME (ms)

PU=1.00A, 10 CYC

PU=0.50A, 10 CYC

PU=0.05A, 10 CYC

PU=1.00A, 10 CYC

PU=0.50A, 10 CYC

PU=0.05A, 10 CYC

D2838-23

Figure 2-2. Maximum Instantaneous Dropout Timing

Moving Average Filter Fault Detector Type 2

A moving average filter (MAF) fault detector provides for a slower but more consistent pickup at low current levels. A MAF fault detector should be used in applications where the current to be detected is less than 0.25 ampere. Typically, the response time for pickup and dropout depends on the number of cycles averaged and how high the input current is above pickup.

Figure 2-3 shows maximum pickup timing versus current input levels for a 10 cycle MAF fault detector.

Figure 2-3. Maximum Pickup Timing with 10 Cycle MAF FD

9272000990 Rev J BE1-BPR Application 2-3

This MAF fault detector is programmed by setting the fault detector digital filter selection to 2 (DFLTR2).

100

120

140

160

180

200

1.05 1.25 2 5 20 40

MULTIPLES OF PICKUP BEFORE DR OPOUT

MAX. DROPOUT TIME (ms)

PU=1.00A, 10 CYC

PU=0.50A, 10 CYC

PU=0.05A, 10 CYC

PU=1.00A, 10 CYC

PU=0.50A, 10 CYC

PU=0.05A, 10 CYC

D2838-24

For the MAF fault detector to pickup (or dropout), the rms value of the average of the last 'n' cycles of current must be above (or below) the pickup setting. Typically, this filter is slow to pickup and slow to dropout but it is intended for use in low current applications where speed is not critical.

Figure 2-4 shows maximum dropout timing versus current input levels for a 10 cycle MAF fault detector.

Figure 2-4. Maximum Dropout Timing with 10 Cycle MAF Fault Detector

Three-Phase Fault Instantaneous (50) Fault Detector Type 3

This fault detector has the same characteristics as the Type 1 instantaneous fault detector with the exception that all three phases must be picked up before the fault detector will pickup. This fault detector can be used in BF logic schemes and is programmed by setting the fault detector logic (LF) type to PI (phase overcurrent) and the digital filter selection to 3.

A 3-phase fault is the worst case fault for system stability and requires fast clearing times with small margins. A 3-phase fault detector and a separate timer could be used in addition to the 3-phase fault detector and timer to allow BF protection for both worst case faults and normal faults.

Application of Fault Detectors

Phase and Ground Instantaneous Fault Detectors. Normally, it is adequate to monitor the three phase

currents as they represent the current in the poles of the protected breaker. However, if the sensitivity of the ground relays is significantly higher than the sensitivity of the phase relays, it may be desirable to apply a ground fault detector so that you can be assured that the breaker failure protection will pickup for any fault that is sensed by the initiating relays. Each fault detector can be independently set to monitor either the three phase current inputs or the neutral current input. Fault detector F1 is programmed as a phase instantaneous fault detector and fault detector F2 is programmed as a neutral instantaneous fault detector in all of the preprogrammed logic schemes.

Three-Phase Instantaneous Fault Detectors. For system stability, a three-phase fault is the worst case. The dynamic stability of the system is not affected as much by the other fault combinations. Since threephase faults are generally rarer than the other fault combinations, it may be desirable to enhance security by treating three-phase faults differently. One of the fault detectors can be set up as a PI, 3 (phase current, Type 3) fault detector to supervise a timer set at the three phase fault, dynamic stability limit. The normal timer supervised by the other fault detectors would then be set with a longer time delay (with more margin) set at the two phase and ground fault (the next worst case), dynamic stability limit.

2-4 BE1-BPR Application 9272000990 Rev J

Low Level Current Detector. If the breaker fails while being opened for normal load switching or due to re-

INITIATE

OUTPUT

RESET

TD[n]

D2635-11

strike after the line has been isolated, the currents flowing across the failed interrupter may be too low to reliably detect by conventional means. The Type 2 fault detector’s moving average filter allows the BE1BPR to discern the low level line charging current from random noise. The application of this fault detector is described in detail in the Breaker Arc Detector sub-section. Fault detector F3 is programmed as a phase MAF fault detector in all pre-programmed logic schemes.

Multiple Breaker Arrangements. In ring bus and breaker and half bus applications, CTs from two breakers are often connected in parallel. If the BE1-BPR is connected to these CTs as shown in Figure 2-5, low fault detector pickup settings should be used with caution. In this arrangement, the CT feeding the BE1BPR can be energized on the secondary side from the CT on the adjacent circuit breaker. This results in current flowing in the BE1-BPR even when the protected circuit breaker has successfully interrupted the fault. This secondary excitation current is generally negligible except when flux remnants or high current/burden causes the CT to saturate.

Figure 2-5. Multiple Breaker Arrangement

General Purpose Timers

Each BPR relay provides six independent timers for breaker failure timing and diagnostics. Each timer can be programmed as a delay or a control timer and can have independent START and RESET conditions. Each timer can also provide a diagnostic log and/or alarm. These features are explained in the following paragraphs.

Delay Timer

A Delay timer has two inputs START and RESET, and one output T[n]. The timer will not start until the start condition becomes TRUE and the RESET input is FALSE. Once the timer is started, a preprogrammed time delay, TD[n], is loaded and the timer starts timing out. Toggling of the START input has no effect once the timer is started. The timer times out TD[n] time after the timer is started unless the timer is RESET before the time expires. If the timer times out, then the T[n] output becomes TRUE. After timeout, T[n] remains TRUE until the timer is RESET. Delay timer operation is illustrated in

Figure 2-6.

Figure 2-6. Delay Timer Operation

9272000990 Rev J BE1-BPR Application 2-5

This type of timer is used to delay an operation in order to allow time for other processes to occur. For

INITIATE

OUTPUT TD[n]

RESET

D2635-12

example, in breaker failure applications, a delay timer is user to delay the breaker failure output until the primary protection scheme has sufficient time to operate the breaker and open the circuit.

Control Timer

A Control timer has two inputs START and RESET, and one output T[n]. The timer will not start until the start condition becomes TRUE and the RESET input is FALSE. Once the timer is started, a preprogrammed time delay, TD[n], is loaded and the timer starts timing out. The timer times out TD[n] time after the timer is started unless the timer is RESET before the time expires. During the entire period the timer is ON (i.e. not timed out and not reset), the output T[n] is TRUE. If the timer times out, then the T[n] output becomes FALSE. After timeout, the T[n] remains FALSE until the timer is RESET and a new START input is received. Control timer operation is illustrated in

Figure 2-7.

Figure 2-7. Control Timer Operation

This type of timer is used to provide a limited window of time for an operation to occur or to provide a feedback signal to latch-in an input for a predetermined time. For example, in breaker failure applications, a control timer can be used to latch-in a BFI input to ensure that once a BFI occurs a premature opening of the BFI for whatever reason does not disable the BF logic.

Another application is to prevent a BF operation due to stuck contacts on the BFI input. BFI input stuck contacts would cause a false trip any time the fault detector picks up. This problem can be minimized by using a control timer to limit the window of opportunity for which the input can cause a trip output.

Timer Diagnostics

In many applications it is desirable to have a record of the timing relationship between different events. In order to acquire this record, data must be available and accumulated over a period of time. A method to obtain and collect this data has been incorporated into the BE1-BPR relays. This method allows relative or absolute timing between any input, output or internal operation (i.e. timers, fault detectors) to be logged into a circular 40 event record. The data can be retrieved for analysis using the TLOG[n] command. In addition, because some timing requirements are critical to proper system operation, an optional alarm output can be automatically triggered if the time logged is outside a predetermined level. The logic used to save a timer value to the log and the optional alarm time is programmable using the PTLOG[n] command.

Refer to Section 1, General Information, Timing Diagnostics, for detailed information on BF timing and an example of using the timing diagnostics to create a MARGIN log.

Reclosing Timers

Each BE1-BPR relay provides six independent reclosing timers. Three reclosing timers (TD791, TD792, and TD793) provide time delays for the multiple shots (one, two, and three). TD79R is the reset time delay, TD79F is the reclose fail time delay, and TD79M is the maximum cycle timer.

Reclosing timer delay settings are programmable from the front panel or the serial port using the TD79 command. The three reclosing time delays can be set at zero or from 10 to 999 milliseconds in 1 millisecond increments, 1 to 99 seconds in 0.1 second increments, or 100 to 600 seconds in 1 second

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