Installation and Commissioning
262
7SS52 V4 Manual
C53000-G1176-C182-3
7.3 Commissioning
When testing the device with secondary test equipment, make sure that no other
measurement quantities are connected and that the TRIP command lines and possi-
bly the CLOSE command lines to the circuit breakers are interrupted.
During the commissioning procedure, switching operations will be carried out. It is as-
sumed for the tests described here that this is possible without danger. Therefore,
these tests are not intended for checks during operation
WARNING!
Hazardous voltages are present in this electrical equipment during operation. Severe
personal injury or property damage can result if the device is not handled properly.
Only qualified personnel shall work on and around this equipment after becoming thor-
oughly familiar with all warnings and safety notices in this instruction manual as well
as with the applicable safety steps, safety regulations, and precautionary measures.
The main points to observe are:
• The device is to be earthed to the substation earth before any other connections are
made.
• Hazardous voltages can exist in the power supply and at the connections to current
transformers, voltage transformers, and test circuits.
• Hazardous voltages can be present in the device even after the power supply volt-
age has been removed, i.e. capacitors can still be charged.
• After removing voltage from the power supply, wait a minimum of 10 seconds be-
fore re-energizing the power supply. This wait allows the initial conditions to be firm-
ly established before the device is re-energized.
• The limit values given in Technical Data must not be exceeded, neither during test-
ing nor during commissioning.
Danger!
The output terminals of the current transformers must be short-circuited on the
transformers themselves before the power supply lines to the device are
disconnected.
Where a test switch is available that short-circuits automatically the output lines of the
current transformer, it will be sufficient to set it to “Test” position, provided that the
short-circuiters have been checked in the first place.
WARNING!
Primary tests may only be carried out by qualified persons who are familiar with the
commissioning of protection systems, with the management of power systems and the
relevant safety rules and guidelines (switching, earthing etc.)
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