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7.2
Commissioning
7SS60 Manual
E50417-G1176-C132-A1
Warning!
Hazardous voltages are present in this electrical equipment during operation. Non–
observance of the safety rules can result in severe personal injury or property dam-
age.
Only qualified personnel shall work on and around this equipment after becoming thor-
oughly familiar with all warnings and safety notices of this manual as well as with the
applicable safety regulations.
Particular attention must be drawn to the following:
• The earthing screw of the device must be connected solidly to the protective earth
conductor before any other electrical connection is made.
• Hazardous voltages can be present on all circuits and components connected to the
supply voltage or to the measuring and test quantities.
• Hazardous voltages can be present in the device even after disconnection of the
supply voltage (storage capacitors!).
• After switching of the auxiliary voltage, 10 s should be allowed to elapse before
switching the auxiliary voltage on again, in order to ensure defined start-up condi-
tions.
The limit values stated in chapter 9.1 must not be exceeded at all, not even during test-
ing and commissioning.
When performing tests with secondary test equipment, attention must be paid that no
other measuring values are applied and that the trip command lines to the circuit
breakers are interrupted, unless explicitly stated otherwise.
DANGER!
The CT secondary terminals must be short-circuited on the CTs before the cur-
rent supply conductors to the device are interrupted!
Where a testing switch is provided which short-circuits the CT secondary lines auto-
matically, it is sufficient to set it to "Test" position, provided that the short-circuiters
have been checked previously.
The commissioning procedure requires to perform switching operations. The tests de-
scribed assume that they can be performed safely. Therefore, they are not suited for
checks during operation.
Warning!
Primary test may only be carried out by qualified personnel, who are familiar with the
commissioning of protection systems, the operation of the plant and the safety rules
and regulations (switching, earthing, etc.).
Installation and Commissioning
7-5
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