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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).
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 current input I
- Is the polarity for the voltage input V
• If test switches are used for the secondary testing of the device, their functions must also be checked, in
particular that in the "Check" position the current transformer secondary lines are automatically short-circuit-
ed.
• 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 MCB (Miniature Circuit Breaker) for auxiliary voltage (supply MU), 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 charg-
ing 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.
• Apply voltage to the power supply.
• Close the protective switches for the voltage transformers.
• Verify that the voltage phase rotation at the device terminals is correct.
• Open the protective switches for the voltage transformers and the power supply.
• Check the trip and close circuits to the power system circuit breakers.
• Verify that the control wiring to and from other devices is correct.
• Check the signaling connections.
• Switch the mcb back on.
SIPROTEC, 6MU805, Manual
C53000-G1140-C380-5, Release date 06.2018
correct (if used)?
N
correct (if used e.g. for broken delta winding or busbar voltage)?
3
Mounting and Commissioning
3.2 Checking Connections
93
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