Siemens SIPROTEC 7UT613 series Manual page 378

3 Mounting and Commissioning
378
• Check the functions of all test switches that may be installed for the purposes of
secondary testing and isolation of the device. Of particular importance are test
switches in current transformer circuits. Be sure these switches short-circuit the
current transformers when they are in the „test" mode (open).
• The short-circuiters of the plug connectors for the current circuits must be checked.
This may be performed with secondary test equipment or other test equipment for
checking continuity. Make sure that terminal continuity is not wrongly simulated in
reverse direction via current transformers or their short-circuiters.
– Remove the front panel.
– Remove the ribbon cable connected to the C–I/O-9 board and pull the board out
until there is no contact between the board and the rear connections of the
device.
7UT613: C-I/O-9 slot 33
7UT633: C-I/O-9 slot 33 right side
7UT635: C-I/O-9 slot 33 right side
– At the terminals of the device, check continuity for each pair of terminals that re-
ceives current from the CTs.
– Firmly re-insert the I/O board.
– At the terminals of the device, again check continuity for each pair of terminals.
– Repeat the above continuity tests for the other boards that receive current from
the CTs.
7UT613: C-I/O-2 slot 19
7UT633: C-I/O-2 slot 19 right
7UT635: C-I/O-9 slot 19 right side
– Carefully plug in the ribbon cable. Be careful not to bend any connector pins. Do
not apply force!
– Attach the front panel and tighten the screws.
• 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 con-
nection modules.
• The measured steady-state current should correspond to the quiescent power con-
sumption of the device. Transient movement of the ammeter merely indicates the
charging current of capacitors.
• Open the miniature circuit breakers for the power supply.
• Disconnect the ammeter; restore the normal power supply connections.
• Switch on voltage transformer protective breaker (if used).
• Verify that the voltage phase rotation at the device terminals is correct.
• Open the miniature circuit breakers for the transformer voltage (VT mcb) and the
power supply.
• Check tripping circuits to the circuit breakers.
• Verify that the control wiring to and from other devices is correct.
• Check the signalling connections.
• Close the protective switches.
7UT613/63x Manual
C53000-G1176-C160-2