Basler Electric BE1-50/51B-240 User Manual

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INSTRUCTION MANUA L

FOR

BE1-50/51B-240

Overcurrent Relay

Publication: 9252000790 Revision: B 08/14

9252000790 Rev B i

Caution

Note

Preface

This instruction manual provides information about the installation and operation of the BE1-50/51B-240 Overcurrent Relay. To accomplish this, the following information is provided:

• General information and specifications

• Controls and indicators

• Functional description

• Installation and maintenance

• Testing

Conventions Used in this Ma nua l

Important safety and procedural information is emphasized and presented in this manual through Warning, Caution, and Note boxes. Each type is illustrated and defined as follows.

Warning!

Warning boxes call attention to conditions or actions that may cause personal injury or death.

Caution boxes call attention to operating conditions that may lead to equipment or property damage.

Note boxes emphasize important information pertaining to Overcurrent Relay installation or operation.

Overcurrent Relay Preface

ii 9252000790 Rev B

Basler Electric does not assume any responsibility to compliance or noncompliance with national code, local code, For terms of service relating to this product and software, see the Commercial Terms of Products and Services

document available at www.basler.com/terms.

It is not the intention of this manual to cover all details and variations in equipment, nor does this manual provide and options are subject to modification without notice. Over time, improvements and revisions may be made to this manual.

The English-language version of this manual serves as the only approved manual version.

12570 State Route 143

Highland IL 62249-1074 USA

www.basler.com

info@basler.com

Tel: +1 618.654.2341

Fax: +1 618.654.2351

First printing: November 2008

Warning!

READ THIS MANUAL. Read this manual before installing, operating, or maintaining the BE1-50/51B-

240. Note all warnings, cautions, and notes in this manual as well as on the product. Keep this manual with the product for reference. Failure to follow warning and cautionary labels may result in personal injury or property damage. Exercise caution at all times.

To prevent personal injury or equipment damage, only qualified personnel should install, operate, or service this system.

or any other applicable code. This manual serves as reference material that must be well understood prior to installation, operation, or maintenance.

data for every possible contingency regarding installation or operation. The availability and design of all features publication. Before performing any of the following procedures, contact Basler Electric for the latest revision of this

Preface Overcurrent Relay

9252000790 Rev B iii

Manual

Revision and Date

Change

–, 11/2008

• Initial release

A, 10/2012

• Added ABB/Westinghouse catalog number CO-2 to list of relays suitable

• Updated relay storage recommendation

B, 8/2014

• Added notes about relay compatibility in older CO relay applications

Revision History

The following information provides a historical summary of the changes made to this instruction manual (9252000790 Rev B). Revisions are listed in chronological order.

for replacement by BE1-50-51B-240

• Improved description of operating current jumpers for targets

Overcurrent Relay Revision History

iv 9252000790 Rev B

Revision History Overcurrent Relay

9252000790 Rev B v

Contents

General Information ...................................................................................................................................... 1

Controls and Indicators ................................................................................................................................. 7

Introduction ................................................................................................................................................ 7

Front Panel Controls and Indicators .......................................................................................................... 7

Circuit Board Controls ............................................................................................................................... 8

Functional Description ................................................................................................................................. 11

Introduction .............................................................................................................................................. 11

Function Block Descriptions .................................................................................................................... 11

Installation ................................................................................................................................................... 13

General .................................................................................................................................................... 13

Factory Settings ....................................................................................................................................... 13

Installation................................................................................................................................................ 13

Connections ............................................................................................................................................. 14

Application Coordination .......................................................................................................................... 15

Maintenance ............................................................................................................................................ 16

Storage .................................................................................................................................................... 16

Testing ......................................................................................................................................................... 17

Introduction .............................................................................................................................................. 17

Dielectric Test .......................................................................................................................................... 17

Test Procedures ...................................................................................................................................... 17

Characteristic Curves .................................................................................................................................. 23

Introduction .............................................................................................................................................. 23

Instantaneous Overcurrent Characteristics ............................................................................................. 23

Time Overcurrent Characteristics ............................................................................................................ 24

Integrating Time Reset Characteristic ..................................................................................................... 40

Overcurrent Relay Contents

vi 9252000790 Rev B

Contents Overcurrent Relay

9252000790 Rev B 1

Catalog Number

Curve Type

CO-2

Short Time

CO-5

Long Time

CO-6

Definite

CO-7

Moderately Inverse

CO-8

Inverse

CO-9

Very Inverse

CO-11

Extremely Inverse

Note

General Information

Introduction

The BE1-50/51B-240 protective relay is a direct replacement for ABB/Westinghouse type CO relays housed in an FT-21 case. The BE1-50/51B-240 has a 5-ampere current sensing input. Compatible ABB/Westinghouse model numbers are listed in Table 1.

Table 1. ABB/Westinghouse Relays Suitable for Direct Replacement

If replacing a CO relay manufactured prior to 1966, please contact Basler Electric to verify compatibility.

To replace an existing ABB/Westinghouse type CO relay, perform the following steps:

1. Select the desired relay settings on your new BE1-50/51B-240 relay.

2. Remove the existing ABB/Westinghouse relay cradle.

3. Insert the new relay cradle.

4. Close the knife-blade switches.

5. Install the new Basler Electric replacement cover glass into existing cover and secure with the

captive thumbnut.

The BE1-50/51B-240 relay is self-powered, compatible with 50 or 60 Hz power systems, and has two protection elements: one time overcurrent (51) element and one instantaneous overcurrent (50) element. The 51 element offers timing characteristic curves similar to those used by GE IAC and Westinghouse CO relays.

Features

A wide range of pickup settings and front panel selectable time characteristics permit applications involving coordination with fuses, reclosers, cold load pickup, motor starting, and fixed time requirements. In addition, an integrating reset function is available to simulate the disk reset of electromechanical relays.

The BE1-50/51B-240 overcurrent relay has the following standard features.

• Independent time and instantaneous elements

• A secure method to manually trip the breaker at the relay front panel

• Direct reading front panel controls

• Minimum pickup setting for safety during installation

• Time characteristics extend to a pickup multiple of 40

• Rugged draw-out construction with steel case

• Gravity latching targets retain indication without power

BE1-50/51B-240 General Information

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• Built-in accuracy eliminates internal adjustments

• Minimum transient overreach

• Field selectable characteristic curve selection similar to GE IAC or Westinghouse CO type curves

• Field selectable instantaneous or integrating reset

• Field selectable 50 or 60 Hz operation

• Field selectable 0.0 or 0.1 second, fixed, instantaneous delay

Internal switches provide for selecting system-operating frequencies of 50 or 60 Hz, instantaneous element delays of 0.0 or 0.1 second, characteristic curve group selection for either GE IAC or Westinghouse CO type curves, and instantaneous or integrating reset characteristics. Switch locations and descriptions are provided in the Controls and Indic ators chapter.

Advantages

The BE1-50/51B-240 overcurrent relay has many advantages over other overcurrent relays. The primary advantages are:

• Time characteristics are defined by equations and graphs

• Field selectable time characteristics

• Very low burden extends the linear range of the CTs

• Self-powered from the sensed current

• Continuous automatic calibration

The BE1-50/51B-240 overcurrent relay may be tested without removing the relay from the case. Shorting contacts are provided for all current inputs when the connection plugs or relay chassis is removed from the relay case.

Specifications

BE1-50/51B-240 electrical and physical specifications are listed in the following paragraphs.

Time Overcurrent (51) Element

Pickup

Setting Range: 0.5 to 15.9 Aac Setting Increment: 0.1 Aac Accuracy: Sum of ±2% and ±25 mAac

Dropout

Dropout occurs at 95% of pickup value.

Characteristic Curves

Available curve types follow IEEE Standard C37.112 (1996) and emulate standard GE IAC, Westinghouse CO, and BS142 curves. The Characteristic Curves chapter illustrates the available curves and lists the applicable constants.

Curve Types: Short Inverse, Long Inverse, Definite Time, Moderately Inverse, Inverse,

Very Inverse, Extremely Inverse, BS142 Very Inverse, BS142 Extremely

Inverse, Fixed Time Time Multiplier: 11 curves for each characteristic Timing Accuracy: ±1 cycle, ±2%. This accuracy applies to the range of 1.3 to 40 times tap

and is for a given measured multiple of tap.

Fixed Timing

Setting Range: 0.1 to 9.9 s Setting Increment: 0.1 s Timing Accuracy: ±1 cycle, ±2% of the time to trip for time dial settings ≥0.1.

General Information BE1-50/51B-240

9252000790 Rev B 3

Continuous Current

Current Sensing Input

-40 -20 0 20 40 60

Ambient Temperature (C)

Current (Aac)

Reset

Integrating: Simulates the disk reset of electromechanical relays and begins when

the current decreases below 95% of pickup. The Characteristic Curves

chapter illustrates the integrating reset characteristic curve and equation. Instantaneous: Reset occurs within 16 ms of when the current decreases below 95% of

the pickup level.

Instantaneous Overcurrent (50) Element

Pickup

Setting Range: 2 to 99 Aac Setting increment: 1 Aac Accuracy: Sum of ±2% and ±25 mAac

Dropout

Dropout occurs at 95% of pickup value.

Time Delay

Switch selectable—no intentional delay (SW3-2 OFF) or a fixed delay of 100 ms (SW3-2 ON). The Characteristic Curves chapter illustrates the characteristic curve for the 50 element.

Current Sensing Input

Continuous Rating: 14 Aac∗ 1 Second Rating: 400 Aac ∗ Continuous rating is 14 Aac for temperatures up to 45°C. See Figure 1 for de-rating curve.

Burden

Figure 1. Current Sensing Input De-rating Curve

Figure 2 illustrates the current sensing input burden characteristic. At 0.5 Aac: 2.8 Ω

At 5.0 Aac: 0.3 Ω

BE1-50/51B-240 General Information

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BE1-50/51B-230 CT Burden

100

120

140

160

0 10 20 30 40 50

Input Current (Amps)

Burden in VA (rms)

BE1-50/51B-240 CT Burden

Figure 2. Current Sensing Input Burden

Frequency Response

A change of ±5 Hz from the nominal 50/60 Hz current causes <0.5% change in the current required for pickup.

Transient Response

<10% overreach with system time constants up to 40 ms.

Harmonic Rejection

Rejection of odd and even harmonics is illustrated in Figure 3.

General Information BE1-50/51B-240

Figure 3. Harmonic Rejection

9252000790 Rev B 5

Target Indicators

A gravity-latched, manually-reset, current-operated target indicator is provided for the time-overcurrent (51) trip output and the instantaneous overcurrent (50) trip output. The level of trip circuit current required to operate each target is individually controlled by a circuit board jumper. See the Controls and Indicators chapter for jumper locations and function assignments

Target Operate Current

Jumper Position—Pins 1 and 2: Must operate ≥ 2.25 A; must not operate < 900 mA.* Jumper Position—Pins 2 and 3: Must operate ≥ 200 mA; must not operate < 80 mA.*

∗ See Output Contacts for the maximum acceptable levels of trip circuit currents.

Output Contacts

Output contacts are surge protected and rated as follows.

Resistive Ratings

120/240 Vac: Make 30 amperes for 0.2 seconds, carry 7 amperes for 2 minutes, 3

amperes continuously, and break 5 amperes. 125/250 Vdc: Make 30 amperes for 0.2 seconds, carry 7 amperes for 2 minutes, 3

amperes continuously, and break 0.3 ampere.

Inductive Ratings

120/240 Vac, 125/250 Vdc: Make and carry 30 amperes for 0.2 seconds, carry 7 amperes for 2

minutes, 3 amperes continuously, and break 0.3 ampere. (L/R = 0.04).

Terminal Assignments

51 Element: 1, 10 50 Element: 2, 10

Type Tests

Isolation: IEEE C37.90-2005 Transient Surge: IEEE C37.90.1-2004 Radiated Interference: IEEE C37.90.2-2004 Electrostatic Discharge: IEEE C37.90.3-2006 Vibration: IEC 255-21-1 Shock and Bump: IEC 255-21-2

Environment

Operating Temperature: –40 to 70°C (–40 to 158°F) Storage Temperature: –50 to 70°C (–58 to 158°F)

Physical

Weight: 4.3 lb (2 kg)

BE1-50/51B-240 General Information

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General Information BE1-50/51B-240

9252000790 Rev B 7

Controls and Indicators

Introduction

BE1-50/51B-240 relay controls and indicators are located on the front panel and circuit board.

Front Panel Controls and Indi c a t ors

Front panel controls and indicators are illustrated in Figure 4 and described in Table 2. The locators and descriptions of Table 2 correspond to the locators shown in Figure 4.

Figure 4. Front Panel Controls and Indicators

BE1-50/51B-240 Controls and Indicators

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Locator

Description

Time Overcurrent Time Dial Selector Switches. These two rotary switches select the

these switches corresponds to a time delay of 0.0 to 9.9 seconds.

Curve Selector Switch. This ten position rotary switch selects one of nine inverse timing details about the timing characteristics of the BE1-50/51B-240.

Time Overcurrent Pickup Selector Switches. These two rotary switches select the time

sting these

selector switches while the relay is in service may cause the relay to trip.

Target Indicators. Re d target indicators latch when the c orresponding set of trip contacts

target indicators are reset by pressing the target reset button (locator G).

Instantaneous Overcurr ent Pickup Selector Switches. T hese two rotary switc hes select the

Note

Instantaneous Overcurrent Manual Trip Jacks. These jacks are used to manually trip a wire, terminated with two standard 0.08 inch diameter phone-tip plugs, into the two jacks.

Target Reset Button. This button is pressed to reset the two, gravity-latched target indicators (locator D).

Active/Pickup Indicator . This bicol or LED indicates the level of curr ent sensed by the relay.

up.

Time Overcurrent Manual Trip Jacks. These jacks are used to manually trip a breaker terminated with two standard 0.08 inch diameter phone-tip plugs, into the two jacks.

Table 2. Front Panel Controls and Indicators

desired curve of the tim ing charac teristic sel ected by the Cur ve Select or Switch ( locator B). When a fixed time charac teristic is use d (Curve Sele ctor Switch set ting of F), th e setting of

characteristics or one fixed time function. Refer to the Characteristic Curves chapter for

overcurrent pickup current setting in amperes (UNITS and TENTHS). Adju

closes and sufficient trip c ircuit current is detected. (The lev el of current that will trip each target indicator is jumper-selectable. See Circuit Boar d Controls for more informat ion.) The Time target indicates the flow of current in the time overcurrent (51) trip circuit. The Inst target indicates the flow of current in the instantaneous overcurrent (50) trip circuit. Both

instantaneous overcurrent (50) pickup current setting in amperes (UNITS and TENTHS). Adjusting these selector switches while the relay is in service may cause the relay to trip.

When testing time overcurrent functions, instantaneous pickup settings of 00 will affect the calibration of the time functions. Time pickup settings of 00 also affect instantaneous functions.

breaker controlled by the 50 trip output contacts. This is achieved by plugging a jumper

The LED is red when t he sensed curre nt exceeds th e time overcurren t pickup settin g. The LED color changes from red to green when the sense d c ur rent dec r eas es b elo w 95% of the time overcurrent pickup setting. A green LED indicates that the relay is active but not picked

controlled by the 51 trip output contacts. This is achieved by plugging a jumper wire,

Circuit Board Controls

Circuit board controls consist of two rotary selector switches, a four-position slide switch, and two jumpers. Circuit board controls are illustrated in Figure 5 and described in Table 3. The locators and descriptions of Table 3 correspond to the locators shown in Figure 5.

Controls and Indicators BE1-50/51B-240

9252000790 Rev B 9

Locator

Description

Target Operating Current J umpers. Two user-adjustable jumpers control the r ange of trip

operate < 80 mA.

Four Position Slide Switc h. This switch assembly, designated S W3, has four independent

instantaneous reset characteristic.

Figure 5. Circuit Board Controls

Table 3. Circuit Board Controls

circuit current required to o perate the time overcurrent ( 51) and instantaneous overcur rent (50) target indicators. J umper J1 sets the m inimum cur rent rang e for the 5 0 target indicator and J2 sets the minimu m c urr ent range for the 51 target indic at or. Two j um per po s itions ar e possible: across pins 1 and 2 or across pins 2 and 3. When the jumper is insta lled across pins 1 & 2, the tar gets must operate ≥ 2.25 A and mus t

not operate < 900 mA. When the

jumper is installed across pins 2 & 3, the targets must operate ≥ 200 mA and must not

slide switches designated SW3-1, SW3-2, SW3-3, and SW3-4. Each switch functions as follows:

SW3-1 selects the no minal system frequency. The OF F position selects 60 Hz operation and the ON position selects 50 Hz operation.

SW3-2 provides an additional time delay for the instantaneous overcurrent (50) element . The ON position provides an additional delay of 100 milliseconds.

SW3-3 selects either GE IAC or Westinghouse CO type characteristic curves. The ON position selects the G E I AC ty pe curv es (l isted i n Tabl e 4) a nd the OFF pos ition s elects t he Westinghouse CO type curves (listed in Table 5).

SW3-4 selects either an instantaneous or integrating time reset characteristic. The ON position selects an integrating reset characteristic and the OFF position selects an

BE1-50/51B-240 Controls and Indicators

10 9252000790 Rev B

Locator

Description

SW9 and SW10. These switches and ass ociated insta ntaneous over current (50-B) element are NOT used on the BE1-50/51B-240.

Controls and Indicators BE1-50/51B-240

9252000790 Rev B 11

Functional Description

Introduction

This chapter illustrates and describes the functional capabilities of the BE1-50/51B-240 relay.

Function Block Descriptions

BE1-50/51B-240 function blocks are illustrated in Figure 6 and described in the following paragraphs.

Figure 6. Function Block Diagram

Current Sensing Input

Single-phase ac current supplied by a system current transformer (CT) is applied to the BE1-50/51B-240 through terminals 8 and 9. Sensing current is applied to internal power and signal CTs.

Power CT and Power Supply

The output of the power CT is supplied to the power supply which provides rectified and filtered operating power for all relay circuitry. A precision 5 Vdc output of the power supply serves as a reference for automatic calibration.

Signal Conditioning

Current from the signal CT is rectified and applied to two independent sets of scaling resistors controlled by the Time Overcurrent (51) and Instantaneous Overcurrent (50) pickup switches. The analog-to-digital converter receives the analog voltage developed across the scaling resistors and converts it into a digital signal that is supplied to the microprocessor.

Microprocessor

The microprocessor performs program operations based on the sensed current, switch settings, and the internal software program.

BE1-50/51B-240 Functional Description

12 9252000790 Rev B

When sufficient current is sensed by the relay, the microprocessor is active and executing code, and the Active/Pickup LED is green. When the sensed current decreases below the operating threshold, microprocessor operation is interrupted and the Active/Pickup LED turns off. A watchdog circuit resets the microprocessor program when code execution is interrupted.

Power-off sensing circuits measure the voltage across a capacitor at power-down and power-up. These circuits determine how long power has been removed based on the difference voltage and the circuit’s RC time constant. This provides information from the integrating reset function even when power has been entirely removed.

The microprocessor performs the program operations based on the inputs and the internal software program. When the sensed current exceeds the TIME PICKUP setting, the ACTIVE/PICKUP LED turns from green to red. The 51 contact is closed in accordance with the TIME characteristic equation or if the sensed current exceeds the INST PICKUP setting. Likewise, sensed current exceeding the Instantaneous Overcurrent Pickup selector switch setting causes the 50 Trip output contacts to close.

Outputs

Two sets of normally-open output contacts rated for tripping duty are provided. The first is used by the time overcurrent (51) element. The second is used by the instantaneous overcurrent (50). A system circuit breaker controlled by the 51 or 50 output contacts can be manually tripped by connecting a jumper across the Time Overcurrent Manual Trip jacks or the Instantaneous Overcurrent Manual Trip jacks. Current flow in a trip circuit is indicated by operation of the corresponding target. The targets will not operate without adequate relay operating power.

Warning!

Trip circuit voltage is present at the front panel trip jacks. When shorting the trip jacks, use insulated jumpers to avoid contact with these voltages.

Target Indicators

Gravity-latched, manually-reset, current-operated target indicators are provided for the time overcurrent (51) trip output and the instantaneous overcurrent (50) trip output. The level of trip circuit current required to operate each target is individually controlled by a circuit board jumper. The minimum operating current range can be set for 80 to 200 milliamperes or 0.9 to 2.25 amperes. See the Controls and Indicators chapter for jumper locations and function assignments.

Functional Description BE1-50/51B-240

9252000790 Rev B 13

Note

Installation

General

When not shipped as part of a control or switchgear panel, the relays are shipped in sturdy cartons to prevent damage during transit. Immediately upon receipt of a relay, check the model and part number against the requisition and packing list to see that they agree. Visually inspect the relay for damage that may have occurred during shipment. If there is evidence of damage, immediately file a claim with the carrier and notify the Regional Sales Office, or contact the Sales Representative at Basler Electric, Highland, Illinois.

Proper operation of the relay may be confirmed by performing the operational test procedures of the Testing chapter. If the relay will not be installed immediately, store the relay in its original shipping carton in a moisture- and dust-free environment.

Factory Settings

BE1-50/51B-240 jumpers and internal switch SW3 are configured at the factory as follows:

• SW3-1: OFF (60-hertz operation)

• SW3-2: OFF (0.0 additional fixed delay for the instantaneous element)

• SW3-3: OFF (Westinghouse CO type characteristic curves)

• SW3-4: ON (Integrating reset characteristics)

• J1 pins 2 and 3: 50 minimum target operating current of 80 to 200 mA

• J2 pins 2 and 3: 51 minimum target operating current of 80 to 200 mA

Installation

If replacing a CO relay manufactured prior to 1966, please contact Basler Electric to verify compatibility.

Select the desired relay settings before putting the relay into service. Changing pickup current settings while the relay is in service may cause tripping. Perform the following procedures to install the BE1-50/51B-240 relay.

1. Select the desired relay settings on your new BE1-50/51B-240 relay.

2. Remove the existing ABB/Westinghouse relay cradle.

3. Insert the new relay cradle and close the knife-blade switches.

4. Install the new Basler Electric replacement cover glass into existing cover and secure with the

captive thumbnut.

BE1-50/51B-240 Installation

14 9252000790 Rev B

Connections

Typical ac connections are shown in Figure 7 and typical dc connections are shown in Figure 8.

Figure 7. Typical AC Connections

Installation BE1-50/51B-240

9252000790 Rev B 15

KBD

−

028.0)202758.0(

110

27624.7

0938.2

+×+

−

Figure 8. Typical DC Connections

Application Coordinat ion

In a typical application coordination scheme, a BE1-50/51B-240 is used to provide distribution protection. An electromechanical overcurrent relay with extremely inverse timing provides protection for the transformer and bus. To improve coordination with the electromechanical relay, the BE1-50/51B-240 is configured with the following settings:

• Integrating reset enabled (SW3-4 ON)

• Westinghouse CO type curves selected (SW3-3 OFF)

The feeder reclosing relay is set for two reclose attempts at 3 and 15 seconds after the initial trip. If a permanent fault occurs (magnitude 10 times pickup), calculate the feeder breaker trip time for each of the three operations. Refer to the Characteristic Curves chapter for the characteristic curve constants and definition of the terms used in the following time characteristic curve equations.

From the time characteristic curve equation:

= 0.209 seconds

BE1-50/51B-240 Installation

16 9252000790 Rev B

−

seconds 15.5

27.75

−=

−

From the reset characteristic curve equation:

M equals 0 if current goes to zero. A negative result indicates reset time.

Result: Full trip equals 0.209 seconds and full reset equals 15.5 seconds if current goes to zero. In Figure 9:

= 0.209 seconds (relay was at reset)

= value<TA because rewind has not gone to zero

Figure 9. Coordination Timing Diagram

Maintenance

A BE1-50/51B-240 relay requires no preventative maintenance other than periodic checking of relay connections to make sure that they are clean and tight. If the relay fails to function properly, contact Basler Electric Technical Sales Sup por t.

Storage

This device contains long-life aluminum electrolytic capacitors. For devices that are not in service (spares in storage), the life of these capacitors can be maximized by energizing the device for 30 minutes once per year.

Installation BE1-50/51B-240

9252000790 Rev B 17

Testing

Introduction

Proper relay operation may be confirmed by performing the test procedures in this chapter.

Dielectric Test

In accordance with IEC 255-5 and IEEE C37.90-1989, one-minute dielectric (high potential) tests may be performed as follows:

• All circuits to ground: 2,828 Vdc or 2,000 Vac

• Input to output circuits: 2,828 Vdc or 2,000 Vac

Output contacts are surge protected.

Test Procedures

The following test procedures verify operation of the BE1-50/51B-240 relay. The test setups illustrated in Figure 10 and Figure 11 are intended primarily as an illustration of the principles involved. Other test equipment known to be capable of testing with the stated and implied tolerances (including equipment designed specifically for testing protective relays) may be used.

The minimum test equipment requirements are:

• Current source with a range of 0 to 20 Aac (sensing input current)

• AC or DC voltage source for target operation

• Timer or counter

Time Overcurrent (51) Pickup

1. Connect and configure the relay for 51 pickup testing: a. Connect the test setup shown in Figure 10. b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation SW3-2 = OFF (no additional time delay for the 50 element) SW3-3 = ON (Westinghouse CO type characteristic curves)

SW3-4 = ON (integrating reset characteristic)

c. Set the TIME DIAL to 0.0. d. Set CURVE to S. e. Set TIME PICKUP to 0.5. f. Set INST PICKUP to 90.

2. Apply and increase current to terminals 8 and 9 until the Active/Pickup LED turns red. The applied

current should be no greater than 0.55 Aac.

3. Decrease the applied current until the Active/Pickup LED changes from red to green and then off.

4. Set TIME PICKUP to 2.2.

5. Slowly increase current to terminals 8 and 9 until the Active/Pickup LED turns red. The applied

current should be between 2.131 and 2.269 Aac.

6. Reduce the applied current to zero.

BE1-50/51B-240 Testing

18 9252000790 Rev B

Figure 10. 51 Pickup, Time Dial, Integrating Reset, 50 Pickup, and Manual Trip Test Setup

Time Dial

1. Connect and configure the relay for time dial testing: a. Connect the test setup shown in Figure 10. b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation SW3-2 = OFF (no additional time delay for the 50 element) SW3-3 = ON (Westinghouse CO type characteristic curves)

SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 4.5. d. Set CURVE to S. e. Set TIME PICKUP to 1.0. f. Set INST PICKUP to 90.

2. Prepare to apply 1.5 Aac to terminals 8 and 9 and record the elapsed time from when current is

applied until the 51 output contacts close.

3. Apply the current (step from 0 to 1.5 Aac) and record the elapsed time. The elapsed time should be

between 0.345 and 0.424 seconds. (This tolerance is greater than ±2% because it is the accumulation of both pickup and timing tolerances.)

4. Remove the input current.

Integrating Reset

1. Connect and configure the relay for integrating reset testing. a. Connect the test setup shown in Figure 10. b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation SW3-2 = OFF (no additional time delay for the 50 element) SW3-3 = ON (Westinghouse CO type characteristic curves) SW3-4 = ON (integrating reset characteristic)

Testing BE1-50/51B-240

9252000790 Rev B 19

c. Set TIME DIAL to 9.9 d. Set CURVE to V. e. Set TIME PICKUP to 1.0. f. Set INST PICKUP to 90.

2. Apply 4.0 Aac to terminals 8 and 9. After the unit trips, remove the applied current for 29 ±0.25

seconds, then reapply the current (4.0 Aac). Note the elapsed time from the reapplication of current to the second trip. The elapsed time should be 2.08 ±0.4 seconds.

Instantaneous Overcurrent (50) Pickup

1. Connect and configure the relay for 50 pickup testing: a. Connect the test setup shown in Figure 10. b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation SW3-2 = OFF (no additional time delay for the 50 element) SW3-3 = ON (Westinghouse CO type characteristic curves)

SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 0.0. d. Set CURVE to S. e. Set TIME PICKUP to 15.0. f. Set INST PICKUP to 02.

2. Apply and slowly increase current to terminals 8 and 9 until the 50 output contacts close. The applied

current should be between 1.935 and 2.065 Aac.

3. Decrease the applied current until the 50 output contacts open.

4. Set INST PICKUP to 08.

5. Slowly increase the current applied to terminals 8 and 9 until the 50 output contacts close. The

applied current should be between 7.815 and 8.185 Aac.

6. Reduce the applied current to zero.

Manual Trip

1. Configure the relay for manual trip testing: a. Connect the test setup as shown in Figure 10. b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation SW3-2 = OFF (no additional time delay for the 50 element) SW3-3 = ON (Westinghouse CO type characteristic curves)

SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 0.0 d. Set CURVE to S. e. Set TIME PICKUP to 1.0. f. Set INST PICKUP to 90.

2. Apply 0.9 Aac to terminals 8 and 9 (0.9 Aac provides relay operating power but is below the pickup

threshold.)

3. Connect a jumper to the Time Overcurrent Manual Trip jacks. Verify that the stop input of the test set

timer recognizes a 51 contact closure.

BE1-50/51B-240 Testing

20 9252000790 Rev B

4. Remove the jumper and the current applied at relay terminals 8 and 9.

5. Apply 0.9 Aac to terminals 8 and 9.

6. Connect a jumper to the Instantaneous Overcurrent Manual Trip jacks. Verify that the stop input of

the test set timer recognizes a 50 contact closure.

7. Remove the jumper and the current applied to relay terminals 8 and 9.

Warning!

Trip circuit voltage is present at the front panel trip jacks. When shorting the trip jacks, use insulated jumpers to avoid contact with these voltages.

Target Indicators

1. Connect and configure the relay for target indicator testing: a. Connect the test setup shown in Figure 11. b. Set circuit board switch SW3 as follows:

SW3-1 = ON for 50 Hz operation or OFF for 60 Hz operation SW3-2 = OFF (no additional time delay for the 50 element) SW3-3 = ON (Westinghouse CO type characteristic curves)

SW3-4 = ON (integrating reset characteristic)

c. Set TIME DIAL to 0.0. d. Set CURVE to S. e. Set TIME PICKUP to 1.0. f. Set INST PICKUP to 90.

The Target Operating Current Jumpers are located on the circuit board and identified as J1 and J2. J1 sets the minimum current range for the 50 target and J2 sets the minimum current range for the 51 target. A jumper installed across pins 1 and 2 gives a minimum operating current of 0.9 to 2.25 A. A jumper installed across pins 2 and 3 gives a minimum operating current of 80 to 200 mA.

2. Apply 2 Aac to terminals 8 and 9 to trip the 51 relay output.

3. Set voltage source to provide a target current determined by the target operating current jumpers.

4. Verify that the 51 target operates.

5. Remove the target and sensing current and reset the target.

6. Set TIME PICKUP to 9.0.

7. Set INST PICKUP to 01.

8. Apply 2 Aac to terminals 8 and 9 to trip the 50 relay output.

9. Set voltage source to provide a target current determined by the target operating current jumpers.

10. Verify that the 50 target operates.

11. Remove the target and sensing current and reset the target.

Testing BE1-50/51B-240

9252000790 Rev B 21

Figure 11. Target Indicators Test Setup

BE1-50/51B-240 Testing

22 9252000790 Rev B

Testing BE1-50/51B-240

9252000790 Rev B 23

Characteristic Curves

Introduction

This chapter describes and defines the instantane ous overcurr ent, time overcurre nt, and integrating tim e reset characteristics of the BE1-50/51B-240 relay.

Instantaneous Overcurrent Characteristics

Timing

The instantaneous characteristic curves of the BE1-50/51B-240 relay are similar to standard electromechanical instantaneous units. However, the time to trip for applications where the initial sensing current is less than 400 mA may be slightly longer. This may occur on a very lightly loaded circuit or when the relay is providing ground protection and is connected to measure neutral current. Figure 12 shows the instantaneous characteristic curves for the maximum time to trip.

Figure 12. Instantaneous Characteristic Curves

The delay of the Instantaneous (50) element can be set for no intentional delay (switch SW3-2 open) or a fixed delay of 100 milliseconds (SW3-2 closed). Figure 5 illustrates the location of SW3.

Pickup

The instantaneous elements of the BE1-50/51B-240 relay may be set lower than the instantaneous element in Westinghouse CO relays and still have the same reach. This is because the BE1-50/51B-240 instantaneous elements effectively eliminate the fault current transient overreach components. When setting the BE1-50/51B-240 instantaneous elements, calculate the symmetrical value without any adder for transient overreach.

BE1-50/51B-240 Characteristic Curves

24 9252000790 Rev B

KBD

−

Curve

Type

Similar To

Number

BE A B C N K R

CO-2

A-2

0.2663

0.03393

1.000

1.2969

0.028

0.500

CO-5

A-3

5.6143

2.18592

1.000

1.0000

0.028

15.750

CO-6

A-4

0.4794

0.21359

1.000

1.5625

0.028

0.875

CO-7

A-5

0.3022

0.12840

1.000

0.5000

0.028

1.750

CO-8

A-6

8.9341

0.17966

1.000

2.0938

0.028

9.000

CO-9

A-7

5.4678

0.10814

1.000

2.0469

0.028

5.500

CO-11

A-8

7.7624

0.02758

1.000

2.0938

0.028

7.750

BS142-B∗

A-9

1.4636

0.00000

1.000

1.0469

0.028

3.250

BS142-C∗

A-10

8.2506

0.00000

1.000

2.0469

0.028

8.000

None†

None

0.0000

1.00000

0.000

0.0000

0.000

1.000

Time Overcurrent Characteristics

Nine inverse time functions and one fixed (definite) time function can be selected at the front panel. Curve types are identified by a letter designator. Available curve types are short inverse (S), long inverse (L), definite time (D), moderately inverse (M), inverse (I), very inverse (V), extremely inverse (E), BS142 inverse, (B), and BS142 extremely inverse (C).

Inverse Time Functions

Characteristic curves for the inverse and definite time functions are defined by the following equation:

Where: T

= time to trip in seconds

D = time dial setting M = multiple of pickup setting A, B, C, N, K = constants for the particular curve

Characteristic Curve Groups

Either GE IAC or Westinghouse CO characteristic curve groups are selected through switch SW3-3. (Refer to Figure 5 for the location of SW3.)

Characteristic Curve Constants

Table 4 and Table 5 list the time characteristic curve constants used by the relay. Constants have been selected to conform to the characteristics of electromechanical relays over a range of pickup multiples from 1.3 to 40. Values of the constants are provided for use in PC relay setting applications. Timing accuracy is ±1 cycle ±2% of time to trip.

Table 4. Time Characteristic Curve Constants with Switch SW3-3 Open (Off)

Figure

Constants

∗ Curves B and C are defined in British Standard BS142 and IEC 255-4 (International

Electrotechnical Commiss io n) . † Fixed time from 0.1 to 9.9 seconds.

Characteristic Curves BE1-50/51B-240

9252000790 Rev B 25

Curve

Type

Similar To

Number

BE A B C N K R

IAC 55

A-11

0.0286

0.0208

1.000

0.9844

0.028

0.0940

IAC 66

A-12

2.3955

0.00002

1.000

0.3125

0.028

7.8001

CO-6

A-4

0.4797

0.21359

1.000

1.5625

0.028

0.8750

CO-7

A-5

0.3022

0.12840

1.000

0.5000

0.028

1.7500

IAC 51

A-13

0.2747

0.1042

1.000

0.4375

0.028

0.8868

IAC 53

A-14

4.4309

0.0991

1.000

1.9531

0.028

5.8231

IAC 77

A-15

4.9883

0.0129

1.000

2.0469

0.028

4.7742

BS142-B∗

A-9

1.4636

0.00000

1.000

1.0469

0.028

3.2500

BS142-C∗

A-10

8.2506

0.00000

1.000

2.0469

0.028

8.0000

None†

None

0.0000

1.00000

0.000

0.0000

0.000

1.0000

Table 5. Time Characteristic Curve Constants with Switch SW3-3 Closed (On)

Figure

Constants

∗ Curves B and C are defined in British Standard BS142 and IEC 255-4 (International

Electrotechnical Commiss io n) . † Fixed time from 0.1 to 9.9 seconds.

Characteristic Curves

Figure 13 through Figure 26 illustrate the BE1-50/51B-240 time overcurrent characteristic curves.

BE1-50/51B-240 Characteristic Curves

26 9252000790 Rev B

Figure 13. Short Inverse (S) Time Characteristic Curve (SW3-3 Off, Similar to CO-2)

Characteristic Curves BE1-50/51B-240

9252000790 Rev B 27

Figure 14. Long Inverse (L) Time Characteristic Curve (SW3-3 Off, Similar to CO-5)

BE1-50/51B-240 Characteristic Curves

28 9252000790 Rev B

Figure 15. Definite Time (D) Time Characteristic Curve (Similar to CO-6)

Characteristic Curves BE1-50/51B-240

9252000790 Rev B 29

Figure 16. Moderately Inverse (M) Time Characteristic Curve (Similar to CO-7)

BE1-50/51B-240 Characteristic Curves

30 9252000790 Rev B

Figure 17. Inverse (I) Time Characteristic Curve (SW3-3 Off, Similar to CO-8)

Characteristic Curves BE1-50/51B-240

9252000790 Rev B 31

Figure 18. Very Inverse (V) Time Characteristic Curve (SW3-3 Off, Similar to CO-9)

BE1-50/51B-240 Characteristic Curves

32 9252000790 Rev B

Figure 19. Extremely Inverse (E) Time Characteristic Curve (SW3-3 Off, Similar to CO-11)

Characteristic Curves BE1-50/51B-240

9252000790 Rev B 33

Figure 20. BS142 Very Inverse (BS142-B) Time Characteristic Curve

BE1-50/51B-240 Characteristic Curves

34 9252000790 Rev B

Figure 21. BS142 Extremely Inverse (BS142-C) Time Characteristic Curve

Characteristic Curves BE1-50/51B-240

9252000790 Rev B 35

Figure 22. Short Inverse (S2) Time Characteristic Curve (SW3-3 On, Similar to IAC 55)

BE1-50/51B-240 Characteristic Curves

36 9252000790 Rev B

Figure 23. Long Inverse (L2) Time Characteristic Curve (SW3-3 On, Similar to IAC 66)

Characteristic Curves BE1-50/51B-240

9252000790 Rev B 37

Figure 24. Inverse (I2) Time Characteristic Curve (SW3-3 On, Similar to IAC 51)

BE1-50/51B-240 Characteristic Curves

38 9252000790 Rev B

Figure 25. Very Inverse (V2) Time Characteristic Curve (SW3-3 On, Similar to IAC 53)

Characteristic Curves BE1-50/51B-240

9252000790 Rev B 39

Figure 26. Extremely Inverse (E2) Time Characteristic Curve (SW3-3 On, Similar to IAC 77)

BE1-50/51B-240 Characteristic Curves

40 9252000790 Rev B

−

Trip to TimeKBD

=++

−

Timing Accuracy

Timing accuracy is the sum of ±1 cycle, ±2%. This accuracy applies to the range of 1.3 to 40 times tap and is for a given measured multiple of tap. Measurement accuracy of the multiple of tap is the sum of ±2%, ±25 mA.

Fixed Time Characteristic

The fixed time characteristic corresponds to the time dial setting and provides delays of 0.0 to 9.9 seconds. The time setting is constant over a range of pickup multiples from 1.0 to 40. Accuracy is ±1 cycle, ±2% of the time to trip for time dial settings of 0.1 and greater.

Integrating Time Reset Characteristic

The relay can be user-configured for integrating or instantaneous type reset. Integrating reset simulates the disk reset of electromechanical relays and begins when the current

decreases below 95% of pickup. The BE1-50/51B-240 relay provides the integrating reset function even when input current decreases to zero.

Integrating reset characteristics are defined by the following equation and are illustrated in Figure 27. See Table 4 and Table 5 for the equation constants.

Where: T R = constant for the particular curve D = time dial setting M = current in multiples of pickup setting during reset

= time to reset in seconds

Figure 27. Integrating Reset Characteristic Curve

Time characteristic curve equation:

Where: D = time dial setting M = multiple of pickup setting

Characteristic Curves BE1-50/51B-240

9252000790 Rev B 41

Reset to Time

−

Reset characteristic curve equation:

Instantaneous Reset

Reset occurs within 16 milliseconds of when the current decreases to 95% of the pickup level.

BE1-50/51B-240 Characteristic Curves

42 9252000790 Rev B

Characteristic Curves BE1-50/51B-240

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Basler Electric BE1-50/51B-240 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

Revision History

General Information

Introduction

Features

Specifications

Controls and Indicators

Introduction

Front Panel Controls and Indi c a t ors

Circuit Board Controls

Functional Description

Introduction

Function Block Descriptions

Installation

General

Factory Settings

Installation

Connections

Application Coordinat ion

Maintenance

Storage

Testing

Introduction

Dielectric Test

Test Procedures

Characteristic Curves

Introduction

Instantaneous Overcurrent Characteristics

Time Overcurrent Characteristics

Integrating Time Reset Characteristic