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3 Mounting and Commissioning
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.
The device is to be grounded to the substation ground 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 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 (Chapter 10) must not be exceeded, neither
during testing nor during commissioning.
When testing the device with secondary test equipment, make sure that no other mea-
surement quantities are connected and that the TRIP command lines and possibly the
CLOSE command lines to the circuit breakers are interrupted, unless otherwise spec-
ified.
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.
For the commissioning switching operations have to be carried out. A prerequisite for
the prescribed tests is that these switching operations can be executed without
danger. They are accordingly not meant for operational checks.
262
7UM61 Manual
C53000-G1176-C127-3
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