Basler Electric BE1-50/51B-231 User Manual

INSTRUCTION MANUAL

FOR

OVERCURRENT RELAY

BE1-50/51B-231

Publication: 9252000895
Revision: C 12/11

INTRODUCTION

This instruction manual provides information about the operation and installation of the BE1-50/51B-231
Overcurrent Relay. To accomplish this, the following information is provided:

 General Information and Specifications
 Controls and Indicators
 Functional Description
 Installation and Maintenance
 Testing

WARNING!

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

9252000895 Rev C BE1-50/51B-231 Introduction i

First Printing: January 2007

Printed in USA

© 2007-2011 Basler Electric, Highland Illinois 62249 USA

All Rights Reserved

December 2011

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, [e-mail]

PHONE [phone] FAX [phone]

ii BE1-50/51B-231 Introduction 9252000895 Rev C

REVISION HISTORY

The following information provides a historical summary of the changes made to this instruction manual
(9252000895). Revisions are listed in reverse chronological order.

Manual

Revision and Date

C, 12/11

B, 12/08

A, 03/08

—, 01/07

 Made changes to reflect that a new connection plug is included with

the relay.

 Updated year of IEEE C37.90 specifications in Section 1.
 Improved description of Locator H (Active/Pickup LED) in Table 2-1.

 Removed notes about hard-wiring relay case to ground since relay is

a direct replacement, i.e. not shipped with a case.

 Updated Storage statement in Section 4.
 Modified Figure 5-2, Target Operational Test Setup.
 In Section 5, Testing, removed list of required tools and removed

steps about disconnecting and re-connecting relay terminal wires.

 Modified Target Test so that TIME and INST targets can be verified

independently from each other.

 Minor text edits throughout manual.
 Updated front panel drawings to show new target reset button.
 Initial release

Change

9252000895 Rev C BE1-50/51B-231 Introduction iii

iv BE1-50/51B-231 Introduction 9252000895 Rev C

CONTENTS

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

SECTION 2 • CONTROLS AND INDICATORS ........................................................................................ 2-1

SECTION 3 • FUNCTIONAL DESCRIPTION ........................................................................................... 3-1

SECTION 4 • INSTALLATION .................................................................................................................. 4-1

SECTION 5 • TESTING ............................................................................................................................ 5-1

APPENDIX A • TIME CHARACTERISTIC CURVES ................................................................................ A-1

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vi BE1-50/51B-231 Introduction 9252000895 Rev C

SECTION 1 • GENERAL INFORMATION

TABLE OF CONTENTS

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

Introduction ............................................................................................................................................ 1-1

Features ................................................................................................................................................. 1-1

Advantages ........................................................................................................................................ 1-2

Specifications ......................................................................................................................................... 1-2

Current Sensing Input ........................................................................................................................ 1-2

Time Overcurrent (51) Element .......................................................................................................... 1-2

Instantaneous Overcurrent (50) Element ........................................................................................... 1-4

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

Frequency Response ......................................................................................................................... 1-6

Transient Response ........................................................................................................................... 1-6

Harmonic Response ........................................................................................................................... 1-7

Target Indicators ................................................................................................................................ 1-7

Output Contacts ................................................................................................................................. 1-7

Type Tests .......................................................................................................................................... 1-7

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

GOST-R Certification ......................................................................................................................... 1-8

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

Figures

Figure 1-1. Integrating Reset Characteristic Curve ................................................................................... 1-4

Figure 1-2. Instantaneous Characteristic Curves
Figure 1-3. Harmonic Rejection
Figure 1-4. Burden Characteristics

...................................................................................... 1-5

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

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

Tables

Table 1-1. GE IAC Relays Suitable for Direct Replacement ..................................................................... 1-1

Table 1-2. Time Characteristic Curve Constants with SW3-3 Open (Off)
Table 1-3. Time Characteristic Curve Constants with SW3-3 Closed (On)

................................................. 1-3

.............................................. 1-3

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ii BE1-50/51B-231 General Information 9252000895 Rev C

SECTION 1 • GENERAL INFORMATION

Introduction

BE1-50/51B-231 protective relays are direct replacements for General Electric, IAC relays. The BE1­50/51B-231 has a 5 ampere current sensing input. Compatible IAC model numbers are listed in
Table 1-1.

Table 1-1. GE IAC Relays Suitable for Direct Replacement

IAC Model Number Curve Type

12IAC51A∗∗∗A

12IAC51B∗∗∗A

12IAC53A∗∗∗A

12IAC53B∗∗∗A

12IAC55A∗∗∗A

12IAC55B∗∗∗A

12IAC66A∗∗∗A

12IAC66B∗∗∗A

12IAC77A∗∗∗A

12IAC77B∗∗∗A

∗ Any digit covering all pickup ranges except 50 Hz models.

Inverse

Inverse with Instantaneous

Very Inverse

Very Inverse with Instantaneous

Short Time

Short Time with Instantaneous

Long Time

Long Time with Instantaneous

Extremely Inverse

Extremely Inverse with Instantaneous

To replace an existing IAC relay, perform the following steps.

1. Select the desired relay settings on your new BE1-50/51B-231 relay.

2. Remove the existing IAC relay.

3. Attach the cover adapter to the existing case.

4. Insert the new relay.

5. Install the new Basler Electric connection plug.

6. Install the new Basler Electric cover.

Basler Electric BE1-50/51B-231 protective relays are self-powered, microprocessor-based, non­directional phase or ground relays that monitor the magnitude of a single-phase ac current to provide
accurate instantaneous and time overcurrent protection for 60 Hz power systems. Each model covers 15
popular time characteristics, a wide range of pickup settings, and field selectable instantaneous or
integrating reset.

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.
Also, an integrating reset function is available to simulate the disk reset of electromechanical relays.

BE1-50/51B-231 overcurrent relays have 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

• Built-in accuracy eliminates internal adjustments

• Minimum transient overreach

• Field selectable characteristic curve selection similar to either GE IAC or ABB type curves

• Field selectable instantaneous or integrating reset

• Field selectable 0.0, 0.1, 0.2, or 0.3 second, fixed, instantaneous delay

9252000895 Rev C BE1-50/51B-231 General Information 1-1

Internal switches provide for selecting instantaneous element delays of 0.0, 0.1, 0.2, or 0.3 second,
characteristic curve group selection for either GE IAC or ABB type curves, and instantaneous or
integrating reset characteristics. Switch location and description is provided in Section 2.

Advantages

BE1-50/51B-231 overcurrent relays have 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

BE1-50/51B-231 overcurrent relays 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-231 electrical and physical specifications are listed in the following paragraphs.

Current Sensing Input

Continuous Current.................... 14 Aac

One Second Rating ................... 400 Aac

Time Overcurrent (51) Element

Setting the TIME PICKUP control at the minimum pickup setting places the relay in the most sensitive
state and may be used as a safety setting.

Pickup

Setting Range ............................ 0.5 to 15.9 Aac

Setting Increment ....................... 0.1 Aac

Accuracy .................................... ±2%, ±25 milliamperes at or above 0.5 ampere setting

Dropout

Dropout occurs at 95% of pickup value.

Timing Range

0.0 to 9.9 seconds in 0.1 second steps.

Timing Accuracy

The 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. The measurement of the multiple of tap has an accuracy that
is the sum of ±2%, ±25 milliamperes.

Timing Accuracy Example

PU setting .................................. 5 amperes

Current Applied .......................... 6.5 amperes

+ Multiple Tolerance .................. 6.655 amperes

– Multiple Tolerance .................. 6.345 amperes

Time Curve ................................ E

Time Dial .................................... 5.0

Minimum time dial

using 6.655 amperes ............... 46.5470 seconds

Maximum time dial

using 6.345 amperes ............... 61.3968 seconds

Curve time using 6.5 amperes ... 53.1800 seconds

1-2 BE1-50/51B-231 General Information 9252000895 Rev C

Curve Characteristics

KBD

CM

AD

T

N

T

++=

-

Nine inverse time functions and one fixed time function can be selected by the front-panel Curve switch.
Characteristic curves for the inverse and definite time functions are defined by the following equation.

Where: TT = time to trip in seconds
D = time dial setting
M = multiple of pickup setting
A, B, C, N, K = constants for the particular curve

Time characteristic curve constants are listed in Tables 1-2 and 1-3. 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 computer relay setting software. Timing accuracy is ±1
cycle, ±2 percent of time to trip.

Table 1-2. Time Characteristic Curve Constants with SW3-3 Open (Off)

Curve Type ∗

BE1 Similar To A B C N K R

Figure

Number †

Constants

S ABB CO-2 A-1 0.2663 0.03393 1.000 1.2969 0.028 0.500

L ABB CO-5 A-2 5.6143 2.18592 1.000 1.000 0.028 15.750

D ABB CO-6 A-3 0.4797 0.21359 1.000 1.5625 0.028 0.875

M ABB CO-7 A-4 0.3022 0.12840 1.000 0.5000 0.028 1.750

I ABB CO-8 A-5 8.9341 0.17966 1.000 2.0938 0.028 9.000

V ABB CO-9 A-6 5.4678 0.10814 1.000 2.0469 0.028 5.500

E ABB CO-11 A-7 7.7624 0.02758 1.000 2.0938 0.028 7.750

B BS142-B ‡ A-8 1.4638 0.00000 1.000 1.0469 0.028 3.250

C BS142-C ‡ A-9 8.2506 0.00000 1.000 2.0469 0.028 8.000

F None § N/A 0.0000 1.00000 0.000 0.0000 0.000 1.000

Table 1-3. Time Characteristic Curve Constants with SW3-3 Closed (On)

Curve Type ∗

BE1 Similar To A B C N K R

Figure

Number †

Constants

S GE IAC 55 A-10 0.0286 0.0208 1.000 0.9844 0.028 0.0940

L GE IAC 66 A-11 2.3955 0.00002 1.000 0.3125 0.028 7.8001

D ABB CO-6 A-3 0.4797 0.21359 1.000 1.5625 0.028 0.8750

M ABB CO-7 A-4 0.3022 0.12840 1.000 0.5000 0.028 1.7500

I GE IAC 51 A-12 0.2747 0.1042 1.000 0.4375 0.028 0.8868

V GE IAC 53 A-13 4.4309 0.0991 1.000 1.9531 0.028 5.8231

E GE IAC 77 A-14 4.9883 0.0129 1.000 2.0469 0.028 4.7742

B BS142-B ‡ A-8 1.4636 0.00000 1.000 1.0469 0.028 3.2500

C BS142-C ‡ A-9 8.2506 0.00000 1.000 2.0469 0.028 8.0000

F None § N/A 0.0000 1.00000 0.000 0.0000 0.000 1.0000

Notes for Tables 1-2 and 1-3

∗ BE1 Curve Types: S: Short InverseV: Very Inverse
L: Long InverseE: Extremely Inverse
D: Definite TimeB: BS142 Very Inverse
M: Moderately Inverse C: BS142 Extremely Inverse
I: Inverse F: Fixed Time Delay

9252000895 Rev C BE1-50/51B-231 General Information 1-3

† Figure numbers refer to the characteristic curves located in Appendix A, Time Characteristic Curves.

1M

RD

T

2

R

−

=

Where:

M = Current in multiples of PICKUP setting during reset

1.0

10.0

100.0

0.000 0.200 0.400 0.600 0.800 1.000 1.200

Multiple of Pickup

xRD (Seconds)

P0046-11

Vertical axis xRD (Seconds) is applicable for all curves and is derived from
multiplying the constant R for the curve selected times D (the Time Dial setting).

‡ Curves B and C are defined in British Standard BS142 and IEC Standard IEC 255-4.

§ Fixed time delay, adjustable from 0.1 to 9.9 seconds.

Integrating Reset

Reset begins when the current drops below 95% of pickup. Integrating reset simulates the disk reset of
electromechanical relays. BE1-50/51B-231 relays provide the integrating reset function even when input
current falls to zero.

Integrating reset characteristics are defined by the following equation and shown in Figure 1-1. Equation
constants are provided in Tables 1-2 or 1-3.

Integrating Reset Equation:

TR = Time to reset in seconds
R = Constant for the particular curve
D = TIME DIAL setting

Figure 1-1. Integrating Reset Characteristic Curve

Instantaneous Overcurrent (50) Element

Setting the INST PICKUP control at the minimum pickup setting places the relay in the most sensitive
state and may be used as a safety setting.

Pickup

Setting Range ............................ 1 to 99 Aac

Setting Increment ....................... 1 Aac

Accuracy .................................... ±2%, ±25 milliamperes at or above 1.0 ampere setting

Dropout

Dropout occurs at 95% of pickup value.

1-4 BE1-50/51B-231 General Information 9252000895 Rev C

Curve Characteristics

P0048-10

Instantaneous characteristic curves are similar to standard electromechanical instantaneous units.
However, the time to trip for applications where the initial current through the relay is less than 0.4
ampere 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.
instantaneous characteristic curves for maximum time to trip.

An additional fixed delay of 0.1, 0.2, or 0.3 second may be added with internal switches SW3-1 and
SW3-2. This delay applies to both phase and ground applications. Closing switch SW3-1 provides an
additional delay of 0.2 second. Closing switch SW3-2 provides an additional delay of 0.1 second. Closing
both SW3-1 and SW3-2 provides an additional delay of 0.3 second. Section 2 illustrates the location of
SW3.

The instantaneous element in BE1-50/51B-231 relays may be set lower than the instantaneous element
in ABB relays and still have the same reach. This is because the BE1-50/51B-231 instantaneous element
effectively eliminates the fault current transient overreach components. When calculating BE1-50/51B­231 relay instantaneous element settings, calculate the symmetrical value without any adder for transient
overreach.

Figure 1-2 shows the

Figure 1-2. Instantaneous Characteristic Curves

9252000895 Rev C BE1-50/51B-231 General Information 1-5

Burden

P0048-11

Burden is non-linear. Figure 1-3 illustrates the device burden.

At 0.5 amperes .......................... 4.8 Ω

At 5.0 amperes .......................... 0.2 Ω

Figure 1-3. Burden Characteristics

Frequency Response

A change of ±5 Hz from the nominal 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.

1-6 BE1-50/51B-231 General Information 9252000895 Rev C

Harmonic Response

Figure 1-4 shows that a relay set for 1 ampere pickup would pick up at 0.96 amperes with a current
containing 40% seventh harmonic. This corresponds to a 10:1 rejection ratio. Other conditions may be
evaluated in the same manner.

Figure 1-4. Harmonic Rejection

Target Indicators

Gravity latched, manually reset targets indicate that current of 0.2 amperes or greater was present in the
trip circuit. Target coil resistance is less than 0.1 ohms and operate time is less than one millisecond. See
Output Contacts for maximum current rating.

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).

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

9252000895 Rev C BE1-50/51B-231 General Information 1-7

Environment

Operating Temperature ............. –40°C to 70°C (–40°F to158°F)

Storage Temperature................. –50°C to 70°C (–58°F to 158°F).

GOST-R Certification

GOST-R certified per the relevant standards of Gosstandart of Russia.

Physical

Weight ........................................ 6.1 lb (2.77 kg)

1-8 BE1-50/51B-231 General Information 9252000895 Rev C