IMM 8001/8002 – Digital Motor Protection Relay
ICE / CEE
____________________________________________________________________________________________
IMU307-1 GB Ind. B
91
TESTS : Verification of ALARM FOR TRIP LOOP SUPERVISION unit
CONNECTION
Protection verification
Current injection
Coefficient
M
to be applied
Terminals
In =
1A
In =
5A
- single-phase
1.732
2-4 or 10-12
3-5 or 11-13
- balanced three-phase
1
2-4 phase 1
3-5 phase 1
10-12 phase 3
11-13 phase 3
Caution – the adjustment of coefficient K must be taken into account in the current to be injected :
K = In machine/IN
CT
Sequence of operations to be performed
Results to be obtained
What is to be done is to simulate a fault (not an alarm) related to phase
currents and to check that if the current or control order on the EL1 input is
still present after the fault, there is a trip loop fault problem.
Check of trip loop supervision unit
Put into service the supervision unit, and route it to a chosen unit.
Put into service a unit affected by a current fault, and route it to a chosen
unit.
Note value
tSup>
Connect the current generator according to the desired connection.
Inject a current to cause the fault :
If the current is not cut off after the fault, or if the EL1 input is still active
after the fault, the supervision unit operates after programmed time
tSup>
.
If the current is cut off immediately after the fault, or if the EL1 input is
deactivated immediately after the fault, the supervision unit does not
operate.
Note : A choice must be made between the detection by the current Ipos or
by EL1.
The selection is actived in the menu
Start
Æ
Start / reacc
Æ
IST>
At the end of time-delay tSup> :
the selected relay must be energised,
the Alarm indicator LED must illuminate,
the alarm message must be displayed.
The supervision unit is inactive.
