Checking Power Plant Connections - Siemens siprotec 7SA6 User Manual

Installation and Commissioning
8.2.2

Checking Power Plant Connections

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8-38
The character idle state for the optical fibre interface is "Light off." If this setting is to
be changed, use the operating program DIGSI
Warning!
Laser injection! Do not look directly into the fibre-optic elements!
Warning!
Some of the following test steps will be carried out in presence of hazardous voltages.
They shall be performed only by qualified personnel which is thoroughly familiar with
all safety regulations and precautionary measures and pay due attention to them.
Caution!
Operating the device on a battery charger without a connected battery can lead to
unusually high voltages and consequently, the destruction of the device. For limit
values see Sub-section 10.2.1 under Technical Data.
Before the device is energized for the first time, the device should be in the final
operating environment for at least 2 hours to equalize the temperature and to minimize
humidity and avoid condensation. Connection are checked with the device at its final
location. The plant must first be switched off and grounded.
Protective switches (e.g. test switches, fuses, or miniature circuit breakers) 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:
q
Are the current transformers grounded properly?
q
Are the polarities of the current transformers the same?
q
Is the phase relationship of the current transformers correct?
q
Are the voltage transformers grounded properly?
q
Are the polarities of the voltage transformers correct?
q
Is the phase relationship of the voltage transformers correct?
q
Is the polarity for current input I
"Currents"?
q
Is the polarity for voltage input U
busbar voltage), cf. also Subsection 8.1.2, "Voltages"?
®
4, as described in Section 5.6.
correct (if used), also refer to Subsection 8.1.2,
4
correct (if used, e.g. with broken delta winding or
4
7SA6 Manual
C53000-G1176-C133-1