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Section 4
Starting up
4.9
Using the RTXP test switch
The RTXP test switch is designed to provide the means of safe testing of the IED. This is
achieved by the electromechanical design of the test switch and test plug handle. When the
test plug handle is inserted, it first blocks the trip and alarm circuits then it short circuits the
CT secondary circuit and opens the 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When pulled out, the test handle is mechanically stopped in half withdrawn position.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. Before removing the test handle, check that no trip or alarms are present in the IED.
Not until the test handle is completely removed, the trip and alarm circuits are restored for
operation.
Current circuit
1.
Verify that the contacts are of current circuit type.
2.
Verify that the short circuit jumpers are located in the correct slots.
Voltage circuit
1.
Verify that the contacts 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 types of contacts are used.
4.10
Checking binary input and output circuits
4.10.1
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 IED
specifications.
32
Verify that the contact sockets have been crimped correctly and that they are
fully inserted by tugging on the wires. Never do this with current circuits in
service.
Insert only the corresponding male connector to the female connector.
Inserting anything else (such as a measurement probe) may violate the female
connector and prevent a proper electrical contact between the printed circuit
board and the external wiring connected to the screw terminal block.
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Breaker protection REQ650
Commissioning manual
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