3.3 Commissioning
477
7SD5 Manual
C53000-G1176-C169-1
3.3 Commissioning
WARNING!
Warning of dangerous voltages when operating an electrical device
Non-observance of the following measures can result in death, personal injury or sub-
stantial property damage.
Only qualified people shall work on and around this device. They must be thoroughly
familiar with all warnings and safety notices in this instruction manual as well as with
the applicable safety steps, safety regulations, and precautionary measures.
Before making any connections, the device must be earthed at the protective conduc-
tor terminal.
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 voltage
has been removed (capacitors can still be charged).
After removing voltage from the power supply, wait a minimum of 10 seconds before
re-energizing the power supply. This wait allows the initial conditions to be firmly es-
tablished before the device is re-energized.
The limit values given in Technical Data must not be exceeded, neither during testing
nor during commissioning.
For tests with a secondary test equipment ensure that no other measurement voltages
are connected and the trip and close commands to the circuit breakers are blocked,
unless otherwise specified.
DANGER!
Hazardous voltages during interruptions in secondary circuits of current trans-
formers
Non-observance of the following measure will result in death, severe personal injury
or substantial property damage.
Short-circuit the current transformer secondary circuits before current connections to
the device are opened.
During the commissioning procedure, switching operations must be carried out. The
tests described require that they can be done without danger. They are accordingly
not meant for operational checks.
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