circuits then it short circuit CT secondary circuit and opens VT secondary circuits
making the IED available for secondary injection.
When pulled out the test handle is mechanically stopped in half withdrawn
position, in this position the current and voltage enter the protection, but the alarm
and trip circuits are still isolated.
Not until the test handle is completely removed the trip and alarm circuits are
restored for operation.
Verify by pulling in all cables that the contact sockets have been
crimped correctly and that they are fully inserted. This should never
be done with current circuits in service.
Current circuit
1. Verify that the contact are of current circuit type.
2. Verify that the short circuit jumpers are located in the correct slots.
Voltage circuit
1. Verify that the contact are of voltage circuit type.
2. Check that no short circuit jumpers are located in the slots dedicated for voltage.
Trip and alarm circuits
1. Check that the correct type of contacts are used.
2.10
Checking transducer circuits
Verify from the manufacturer that the total circuit resistance is under specified
values from the instrument (transducer) manufacturer.
2.11
Checking binary input and output circuits
2.11.1
Binary input circuits
Preferably, disconnect the binary input connector from the binary input cards.
Check all connected signals so that both input level and polarity are in accordance
with the IEDs specifications.
1MRS756801 A
Section 2
Starting up
630 series
19
Commissioning Manual
