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•
Connect an ammeter in the supply circuit of the power supply. A range of about 2.5 A to 5 A for the
meter is appropriate.
•
Switch on m.c.b. for auxiliary voltage (supply protection), check the voltage level and, if applicable, the
polarity of the voltage at the device terminals or at the connection modules.
•
The current input should correspond to the power input in neutral position of the device. The measured
steady state current should be insignificant. Transient movement of the ammeter merely indicates the
charging current of capacitors
•
Apply voltage to the power supply
•
Close the protective switches for the voltage transformers.
•
Verify that the voltage phase rotation at the device terminals is correct.
•
Open the protective switches for the voltage transformers and the power supply.
•
Check the trip and close circuits to the power system circuit breakers.
•
Verify that the control wiring to and from other devices is correct.
•
Check the signaling connections.
•
Switch the mcb back on.
SIPROTEC 4, 7RW80, Manual
C53000-G1140-C233-4, Edition 07.2018
Mounting and Commissioning
3.2 Checking Connections
143
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