Time Delay Test - GE Multilin DBT Instruction Manual

7.4 TIME DELAY TEST

The check the tripping time the loss of continuity of the coil connected to terminals B2 and B3 will be simulated.
CLOCK
start stop
P
U
S
H
B
U
T
T
O
N
* The maximum setting will be made by placing all the dip switches in the UP position
The setting is limited to 20 s (as explained previously).
Measure the drop-out time of the output relay.
This time will be between 100 and 150 ms (nominal value 125 ms).
During this test it can be seen that the measured times may vary slightly owing to the response time of the measuring
units and the output relays.
GEK-105597C
RECEPTION TESTS
Insert a dual-circuit switch. One of the circuits
which is normally closed will short-circuit
terminals B2 and B3, simulating that the coil is
correct. The other contact (normally opened)
will be connected to the start-up of a timer. The
DBT
timer stop will be connected to one of the
breaker circuit failure relays. When the push-
C11
button is pressed the B2-B3 will be opened,
Breaker
leading to a start of failure.
D11 circuit
failure
Create a fault as described (above) and check
B3
that the results in the table are complied with.
B2
TIMER DELAY
setting
200 ms
300 ms
400 ms
600 ms
1 s
1.8 s
3.4 s
6.6 s
13 s
Maximum *
DBT Digital Trip Coil Supervision Relay
Minimum time Maximum time
200 ms 240 ms
300 ms 340 ms
400 ms 440 ms
600 ms 640 ms
1 s 1.04 s
1.8 s 1.84 s
3.4 s 3.44 s
6.6 s 6.64 s
13 s 13.04 s
19.9 s 20.1 s
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