Checking System Connections - Siemens siprotec SJ62 User Manual

3.2.2

Checking System Connections

SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
WARNING!
Warning of dangerous voltages
Non-observance of the following measures can result in death, personal injury or sub-
stantial property damage.
Therefore, only qualified people who are familiar with and adhere to the safety proce-
dures and precautionary measures should perform the inspection steps.
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 Technical Data, Section 4.1).
If undervoltage protection is configured and enabled in the device and if, at the same
time, the current criterion is disabled, the device picks up right after auxiliary voltage
has been connected, since no measuring voltage is available. To make the device con-
figurable, pickup is to be stopped, i.e. the measuring voltage is connected or voltage
protection is blocked. This can performed by operation.
Before the device is energized for the first time, it should be in the final operating en-
vironment 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 connection diagrams:
– Are the current transformers grounded properly?
– Are the polarities of the current transformers the same?
– Is the phase relationship of the current transformers correct?
– Are the voltage transformers grounded properly?
– Are the polarities of the voltage transformers correct?
– Is the phase relationship of the voltage transformers correct?
– Is the polarity for current input I
– Is the polarity for voltage input V
broken delta winding or busbar voltage)?
3.2 Checking Connections
correct (if used)?
4
correct (only with 7SJ64 and if used, e.g. for
4
418