Commissioning
Commissioning
Before starting work on an opened switchboard it is imperative that the complete switchboard is dead and the
following 5 safety regulations are always met: ,
Safety precautions:
•
Disconnect from the power supply
•
Secure against reconnection
•
Verify if the equipment is dead
•
Connect to ground and short-circuit all phases
•
Cover or safeguard all live adjacent parts
The secondary circuit of a current transformer must never be opened
during operation. The prevailing high voltages are dangerous to life.
Even when the auxiliary voltage is switched off, it is likely that there are still
hazardous voltages at the component connections.
All locally applicable national and international installation and safety
regulations for working at electrical power installations must always to be
followed (e.g. VDE, EN, DIN, IEC).
Prior to the initial voltage connection, the following must be guaranteed:
•
Correct grounding of the device
•
That all signal circuits are tested
•
That all control circuits are tested
•
Transformer wiring is checked
•
Correct rating of the CTs
•
Correct burden of the CTs
•
That the operational conditions are in line with the Technical Data
•
Correct rating of the transformer protection
•
Function of the transformer fuses
•
Correct wiring of all digital inputs
•
Polarity and capacity of the supply voltage
•
Correct wiring of the analogue inputs and outputs
The permissible deviations of measuring values and device adjustment are
dependent on the technical data/tolerances.
Page 304
EN MRU4 10/09
