GE MVAX 11, Technical Manual

Page: 20 / 38

R8010
R
B
Service Manual
Page 10/24 MVAX
Test 6
With the circuit breaker closed, operate, or simulate operation of the associated trip relay.
Ensure the CB trips but ensure that RL1 of the MVAX does not operate.
The MVAX relay units are slugged on drop-off to prevent mal-operation during the transition
period.
Relay V. rating 24/27 30/34 48/54 110/125 220/250
Ref. V. for tolerance 27 34 54 125 250
Hand
reset flag
7.8 – 8.2V 9.4 – 9.8V 13.6 – 14.2V 27.9 – 29.4V 55.3 – 58.4V
Test 1
(Trip
supply)
Self reset
flag
6.3 – 6.7V 9.4 – 9.8V 13.6 – 14.2V 27.9 – 29.4V 55.3 – 58.4V
Hand
reset flag Full volts
(no ext. R) Full volts
(no ext. R)
36.5 – 42.7V 31.3 – 38.8V 27.3 – 33.8V
Test 2
(Alarm
supply)
Self reset
flag Full volts
(no ext. R) Full volts
(no ext. R)
38.2 – 39.3V 40.9 – 43.7V 31.1 – 34.0V
Hand
reset flag
15.7 – 16.3V 18.8–19.7V 27.1 – 28.5V 55.8 – 58.9V 110.6 –116.8V
Test 3
(Trip
supply)
Self reset
flag
12.7 – 13.3V 18.8–19.7V 27.1 – 28.5V 55.8 – 58.9V 110.6 –116.8V
Hand
reset flag
665 1085 3100 7400 14700
Test 4
Self reset
flag
522 1085 3100 7400 14700
Table 2
2.7.5 MVAX 31 04 only
The following test assume trip and alarm supply battery voltages are equal to the maximum
voltage for the relays voltage rating range. For other voltages within the relays normal
voltage rating range, tolerance bands for other measured supply voltages should be altered
pro-rata. A Table (Table 1) of acceptable tolerance for the test is given.
Measure the trip supply and alarm supply voltages immediately prior to tests
and note.
Test 1
With the circuit breakers open, check that no voltage appears across terminals 13 and 14, 21
and 22 of the relay. Check that the voltage appearing across terminals 27(+) and 28 comply
with that given in Figure 1 (alarm supply) and that the front relay RL1, has operated. Reset
the flag.
Test 2
With the circuit breakers closed, check that the front relay remains operated. Measure the
voltage across terminals 13(+), 14, 21(+) and 22. Ensure that these comply with Figure 1
(trip supply).
Test 3
With the circuit breakers closed, apply a temporary short circuit across each of the external
resistors R
EXT 2(1)* and R EXT 2(2)* of the trip supply circuits. Ensure the circuit breakers do
not trip. Remove the short circuits and reapply them across terminals 13 and 14 and 22 of
the relay. Check that RL1 drops-off to initiate alarm circuits and that the RL1 flag indication
is given. Ensure the circuit breakers do not trip. Remove the short circuits and reset the
flag/alarms.
*Note: Where 2 resistors are used in series for R
EXT
2, a temporary short
circuit should be applied across each resistor in turn.