Basler BE1-50/51B-233 User manual

INSTRUCTION MANUAL
FOR
OVERCURRENT RELAY
BE1-50/51B-233
Publication: 9252000897
Revision: A 03/08

9252000897 Rev A BE1-50/51B-233 Introduction i
INTRODUCTION
This instruction manual provides information about the operation and installation of the BE1-50/51B-233
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.
NOTE
Be sure that the relay 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 relay is configured in a system with other devices, it is recommended to use a
separate lead to the ground bus from each unit.

ii BE1-50/51B-233 Introduction 9252000897 Rev A
First Printing: January 2007
Printed in USA
© 2008 Basler Electric, Highland Illinois 62249 USA
All Rights Reserved
March 2008
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
ROUTE 143, BOX 269
HIGHLAND IL 62249 USA
http://www.basler.com, [email protected]
PHONE [phone] FAX [phone]
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.

9252000897 Rev A BE1-50/51B-233 Introduction iii
REVISION HISTORY
The following information provides a historical summary of the changes made to this instruction manual
(9252000897). Revisions are listed in reverse chronological order.
Manual
Revision and Date Change
A, 03/08 •Updated front panel drawings to show new target reset button.
―, 01/07 •Initial release.

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9252000897 Rev A BE1-50/51B-233 Introduction v
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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9252000897 Rev A BE1-50/51B-233 General Information i
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................................................................................................................................................ 1-5
Frequency Response.........................................................................................................................1-6
Transient Response ...........................................................................................................................1-6
Harmonic Response...........................................................................................................................1-6
Target Indicators ................................................................................................................................1-7
Output Contacts .................................................................................................................................1-7
Type Tests..........................................................................................................................................1-7
Environment .......................................................................................................................................1-8
Agency Recognition ...........................................................................................................................1-8
Physical..............................................................................................................................................1-8
Figures
Figure 1-1. Integrating Reset Characteristic Curve...................................................................................1-4
Figure 1-2. Instantaneous Characteristic Curves......................................................................................1-5
Figure 1-3. Burden Characteristics............................................................................................................1-6
Figure 1-4. Harmonic Rejection.................................................................................................................1-7
Tables
Table 1-1. ABB Relays Suitable for Direct Replacement..........................................................................1-1
Table 1-2. Time Characteristic Curve Constants with SW3-3 Open (Off).................................................1-3
Table 1-3. Time Characteristic Curve Constants with SW3-3 Closed (On) .............................................. 1-3

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9252000897 Rev A BE1-50/51B-233 General Information 1-1
SECTION 1 •GENERAL INFORMATION
INTRODUCTION
BE1-50/51B-233 protective relays are direct replacements for Westinghouse/ABB type CO relays. The
BE1-50/51B-233 has a 5 ampere current sensing input. Specific relays by catalog number are listed in
Table 1-1.
Table 1-1. ABB Relays Suitable for Direct Replacement
ABB Catalog Number Curve Type
CO-2∗11∗1N Short Time
CO-5∗11∗1N Long Time
CO-6∗11∗1N Definite
CO-7∗11∗1N Moderately Inverse
CO-8∗11∗1N Inverse
CO-9∗11∗1N Very Inverse
CO-11∗11∗1N Extremely Inverse
∗Any digit covering all pickup ranges except 50 Hz models.
To replace an existing Westinghouse/ABB type CO (hereinafter referred to as ABB relay), perform the
following steps.
1. Select the desired relay settings on your new BE1-50/51B-233 relay.
2. Remove the existing ABB relay cradle.
3. Insert the new relay cradle.
4. Close the knife-blade switches.
5. Install the new Basler Electric cover and secure with the captive thumbnut.
Basler Electric BE1-50/51B-233 protective relays are self-powered, microprocessor-based, non-
directional 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-233 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
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 ABB CO or GE IAC type curves, and instantaneous or
integrating reset characteristics. Switch location and description is provided in Section 2.

1-2 BE1-50/51B-233 General Information 9252000897 Rev A
Advantages
BE1-50/51B-233 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-233 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-233 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
Curve Characteristics
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
KBD
CM
AD
TN
T++= -

9252000897 Rev A BE1-50/51B-233 General Information 1-3
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 ∗Constants
BE1 Similar To Figure
Number †A B C N K R
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 ∗Constants
BE1 Similar To Figure
Number †A B C N K R
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 Inverse V: Very Inverse
L: Long Inverse E: Extremely Inverse
D: Definite Time B: BS142 Very Inverse
M: Moderately Inverse C: BS142 Extremely Inverse
I: Inverse F: Fixed Time Delay
† Figure numbers refer to the characteristic curves located in Appendix A, Time Characteristic Curves.
‡ 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-233 relays provide the integrating reset function even when input
current falls to zero.

1-4 BE1-50/51B-233 General Information 9252000897 Rev A
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:
1M
RD
T2
R−
=
Where:
TR= Time to reset in seconds
R = Constant for the particular curve
D = TIME DIAL setting
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).
Figure 1-1. Integrating Reset Characteristic Curve
Instantaneous Overcurrent (50) Element
Setting the INST PICKUP control to 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.
Curve Characteristics
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. Figure 1-2 shows the
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

9252000897 Rev A BE1-50/51B-233 General Information 1-5
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-233 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-233 instantaneous element
effectively eliminates the fault current transient overreach components. When calculating BE1-50/51B-
233 relay instantaneous element settings, calculate the symmetrical value without any adder for transient
overreach.
P0048-10
Figure 1-2. Instantaneous Characteristic Curves
Burden
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

1-6 BE1-50/51B-233 General Information 9252000897 Rev A
P0048-11
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.
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.

9252000897 Rev A BE1-50/51B-233 General Information 1-7
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
Meets IEC 255-5 and exceeds IEEE C37.90-1989, one-minute dielectric (high potential) tests as follows.
All circuits to ground: 2,828 Vdc
Input to Output Circuits: 2,000 Vac or 2,828 Vdc
Surge Withstand Capability
Qualified to IEEE C37.90.1-1989 Standard Surge Withstand Capability (SWC) Tests for Protective Relays
and Relay Systems.
Impulse
Qualified to IEC 255-5.

1-8 BE1-50/51B-233 General Information 9252000897 Rev A
Radio Frequency Interference (RFI)
Field-tested using a 5-watt, hand-held transceiver operating at random frequencies centered around 144
MHz and 440 MHz, with the antenna located 6 inches from the relay in both horizontal and vertical
planes.
Vibration
Withstands 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.
Shock
Withstands 15 G in each of three mutually perpendicular planes.
Environment
Operating Temperature: –40°C to 70°C (–40°F to158°F)
Storage Temperature: –50°C to 70°C (–58°F to 158°F).
Agency Recognition
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.
Physical
Weight: 6.1 lb (2.77 kg)

9252000897 Rev A BE1-50/51B-233 Controls and Indicators i
SECTION 2 •CONTROLS AND INDICATORS
TABLE OF CONTENTS
SECTION 2 •CONTROLS AND INDICATORS........................................................................................2-1
INTRODUCTION....................................................................................................................................2-1
Figures
Figure 2-1. Front Panel Controls and Indicators .......................................................................................2-1
Figure 2-2. Location of SW3......................................................................................................................2-2
Tables
Table 2-1. BE1-50/51B-233 Controls and Indicators (Refer to Figures 2-1 and 2-2)................................2-3

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