Introduction, Dielectric test, Test procedures – Basler Electric BE1-50/51B-235 User Manual
Page 37: Model be1-50/51b-235 (five ampere sensing input), Time overcurrent (51) pickup, Section 5 • testing -1, Introduction -1, Dielectric test -1, Test procedures -1, Time overcurrent (51) pickup -1
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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)
•
AC or DC voltage source (target operation)
•
Timer or counter
Model BE1-50/51B-235 (Five Ampere Sensing Input)
1. Connect and configure the relay for 51 pickup testing:
Time Overcurrent (51) Pickup
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 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 (50-A) to 90.
g. Set INST PICKUP (50-B) (accessed at the top side of the assembly) to F0 (15.0 Aac).
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, 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.