3.2 Checking Connections
377
7UT613/63x Manual
C53000-G1176-C160-2
3.2.2 Checking the System Connections
Before the device is energized for the first time, the device should be in the final oper-
ating environment for at least 2 hours to equalize the temperature, to minimize humid-
ity and avoid condensation. Connections are checked with the device at its final loca-
tion. The plant must first be switched off and grounded.
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 shall perform the inspection steps.
Caution!
Be careful when operating the device on a battery charger without a battery
Non-observance of the following measure 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. (Limit
values can be found in the technical data).
Connection examples for current transformer circuits are provided in the Appendix
A.3. Please observe the terminal assignments (see Appendix A.2).
Proceed as follows in order to check the system connections:
• Protective switches for the power supply and the measured voltages must be
switched off.
• Check the continuity of all current and voltage transformer connections against the
system and connection diagrams:
– Is the connection of all 3-phase current transformer sets to the device inputs
correct and in accordance with the set topology?
– Is the connection of all 1-phase current transformers to the device inputs correct
and in accordance with the set topology?
– Are the current transformers earthed properly?
– Are the polarities of the current transformers the same for each CT set?
– Phase assignment of all 3-phase current transformers correct?
– Are the polarities of all single-phase current inputs correct (if used)?
– Are the voltage transformers earthed properly (if used)?
– Are the polarities of the voltage transformers correct (if used)?
– Is the phase relationship of the voltage transformers correct (if used)?
– Is the polarity for voltage input U
4
correct (if used, e.g. with open delta winding)?
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