Checking The System Connections - Siemens SIPROTEC 7RW80 Manual

Mounting and Commissioning
3.2 Checking Connections
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).
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 voltage transformer connections against the switchgear and connection diagrams:
– 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 voltage input V
• If check switches are used for secondary testing of the device, their functions also must be checked.
• 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 po-
larity 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.
• 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 signalling connections.
• Switch the mcb back on.
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correct and if used, e.g. for broken delta winding or busbar voltage)?
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SIPROTEC, 7RW80, Manual
C53000-G1140-C233-1, Release date 10.2010