9252000898 Rev —
BE1-50/51B-235/-236 Testing
5-1
SECTION 5
•
TESTING
INTRODUCTION
Proper relay operation may be confirmed by performing the test procedures in this section.
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-235 and BE1-50/51B-236 relays. The
test setups illustrated in Figures 5-1 through 5-6 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)
•
Current source with a range of 0 to 3.0 Aac (target operation)
•
Timer or counter
Model BE1-50/51B-235 (Five Ampere Sensing Input)
Time Overcurrent (51) Pickup
1. Connect and configure the relay for 51 pickup testing:
a. Connect the test setup shown in Figure 5-1.
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-A element)
SW3-3 = ON (Westinghouse/ABB 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.
NOTES
To ensure proper timing during testing, remove the current from the relay for R
times D seconds. (Refer to Appendix A,
Characteristic Curves
for definitions of R
and D.
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.
When testing TIME overcurrent functions, INST PICKUP settings of 00 will affect
the calibration of the TIME functions. TIME PICKUP settings of 00 also affect
INST functions.
Observe all applicable electrostatic discharge (ESD) precautions when handling
the relay assembly.
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