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3.2.2
Checking the System Connections
WARNING!
Warning of dangerous voltages
Non-observance of the following measures can result in death, personal injury or substantial property damage.
Therefore, only qualified people who are familiar with and adhere to the safety procedures 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 destruc-
tion 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 configurable, pickup is to be stopped, i.e. the measuring voltage is connected or
voltage protection is blocked. This can be performed by operation.
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 for checking the system connections:
• Circuit breakers for the auxiliary power supply and the measuring voltage 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 transformer connections the same?
– Is the phase assignment of the current transformers correct?
– Are the voltage transformers grounded properly?
– Are the polarities of the voltage transformer connections the same and correct?
– Is the phase assignment of the voltage transformers correct?
– Is the polarity for the current input I
– Is the polarity for the voltage input V
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
, I
correct (if used)?
N
Ns
correct (if used e.g. for broken delta winding or busbar voltage)?
3
Mounting and Commissioning
3.2 Checking Connections
325
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