GE BUS1000, Instructions Manual

Page: 47 / 129

7. ACCEPTANCE TESTS
GEK-98514B BUS1000 Busbar Protection 7-11
7.12. UNITS CALIBRATION
The units must only be readjusted if the values measured are beyond the indicated tolerance limits.
7.12.1. MAIN UNITS
Prior to the measure units calibration, the currents should be lead to the corresponding differential (double
bus). For this purpose, a positive must be applied to terminals (see table 2: Bar connection & disconnection
or differential A, and to terminals (see table 2: Bar connection & disconnection) for differential B. These
terminals correspond to the position to be used for the carrying out of the test.
Before starting these tests, adjust the SUP. units of every differential board to 0.2 ( Instruction Book FIG 20
back Cambion ) and shorting the stabilization resistors.
Set the cambion slope (Instruction Book FIG 20 front Cambion ) to 0.8. Apply 0.5 A through the leads
corresponding to each phase, according to the above list, and adjust with P1 potentiometer of each board for
the differential of the corresponding phase to operate with that value.
Check the rest of the pickup currents of each differential for each phase and for each of the rest of the
slopes (Instruction Book FIG 20 front Cambion).
SLOPE PICKUP CURRENT
0.5 0.190 - 0.210
0.6 0.237 - 0.263
0.7 0.313 - 0.347
0.8 0.475 - 0.525
The obtained value will be recorded in the corresponding box.
7.12.2. SUPERVISION UNITS
Before starting with these tests, adjust the slope of the differential units to 0.5 (Instruction Book FIG 20 front
Cambion), Check that the stabilization resistors are shorted.
Set the supervision of the differential boards to 0.5 (Instruction Book FIG 20. back Cambion). Apply 0.5 A
through the leads corresponding to each phase, according to the above, and adjust with the P4
potentiometer of each board for the differential of the corresponding phase to operate with that value.
Check the rest of the pickup currents of each differential for each phase and for each of the rest of the
adjustment values (Instruction Book FIG 20 back Cambion).
ADJUSTM. VALUE PICKUP VALUE
0.2 0.190-0.210
0.3 0.285-0.315
0.5 0.475-0.525
0.8 0.760-0.840
1.0 0.950-1.050
1.5 1.425-1.575
2 1.900-2.100
The obtained value will be recorded in the corresponding box.