Siemens SIPROTEC 4 7SJ61 Manual page 263

!
CAUTION
Take care when operating the device without a battery on a battery charger.
Non-observance of the following measures can lead to unusually high voltages and consequently,
the destruction of the device.
Do not operate the device on a battery charger without a connected battery. (For limit values see also
²
Technical Data, Section
Before the device is energized for the first time, it should be in the final operating environment for at least 2
hours to equalize the temperature, to minimize humidity and to avoid condensation. Connections are checked
with the device at its final location. The plant must first be switched off and grounded.
Proceed as follows in order to check the system connections:
•
Protective switches for the power supply and the measured voltages must be opened.
•
Check the continuity of all current and voltage transformer connections against the system and connec-
tion diagrams:
– Are the current transformers grounded properly?
– Are the polarities of the current transformer connections the same?
– Is the phase relationship of the current transformers correct?
–
Is the polarity for current input Ι
•
Check the functions of all test switches that are installed for the purposes of secondary testing and isola-
tion 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.
•
The short-circuiters of the current circuits of the device have to 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 of the device
– Remove the ribbon cable connected to the I/O board with the measured current inputs (on the front
side it is the right printed circuit board). Furthermore, remove the printed circuit board so that there
is no more contact with the plug-in terminal of the housing.
– At the terminals of the device, check continuity for each pair of terminals that receives current from
the CTs
– Firmly re-insert the I/O board. Carefully connect the ribbon cable. Do not bend any connector pins !
Do not use force !
– At the terminals of the device, again check continuity for each pair of terminals that receives current
from the CTs.
– 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 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.
•
Remove the voltage from the power supply by opening the protective switches.
•
Disconnect the measuring test equipment; restore the normal power supply connections.
•
Check the trip and close circuits to the power system circuit breakers.
SIPROTEC 4, 7SJ61, Manual
C53000-G1140-C210-6, Edition 05.2016
4.1 General Device Data).
correct (if used)?
4
Mounting and Commissioning
3.2 Checking Connections
263