Siemens SIPROTEC 7VU681, User Manual

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Mounting And Commissioning
3.3 Commissioning
SIPROTEC, 7VU681, User Manual
C53000-G1176-C368-1, Release Date 07.2012
84
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 substantial 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 established before the device is re-energized.
The limit values given in Technical Data must not be exceeded, neither during testing nor during
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 possibly the CLOSE command lines to the circuit breakers
are interrupted, unless otherwise specified.
DANGER!
Hazardous voltages during interruptions in secondary circuits of current transformers.
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.
WARNING!
Warning of dangers evolving from improper primary tests
Non-observance of the following measures can result in death, personal injury or substantial property damage.
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.).