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5.13. Putting into service
5.13.1. Preparatory operations
Before connection to the medium voltage network
The following operations must be carried out in preparation
for putting into service:
– Check the general condition of the switchgear to make sure
there are no defects or damage.
– Visually inspect the switching devices, isolating contacts,
insulating parts, etc.
– Check the main earthing busbar connection to the earthing
conductor of the installation (in compliance with the
appropriate safety regulations).
– Check the paintwork for damage and touch up where
necessary.
– Remove all residues of materials, foreign objects and tools
from the switchgear.
– Clean the switchgear by rubbing down the insulating parts
with a clean, dry, soft, non-fraying cloth. Remove any
traces of greasy or sticky dirt with water and slightly alkaline
detergent.
– All covers removed during the assembly and testing
operations must be properly fitted back in place.
– Preparatory work for circuit-breakers:
− Clean the insulating parts with a clean, dry cloth.
− Check that the upper and lower terminals are clean and
free from any deformation caused by shocks received
during transport and storage.
− If the HD4 circuit-breaker is equipped with a pressure
measuring device, it is advisable to check the SF6 gas
pressure.
– Switch on the auxiliary and operating voltage.
– Perform tests on the switching devices either manually or
using electrical operating mechanisms while observing the
relative position indicators.
– Check the efficiency of the mechanical and electrical
interlocks without using force.
– Check the SF
6
gas pressure of the GSec switch-
disconnector and HD4 circuit-breaker (if available).
– Set the required values for the protection devices in the
switchgear and make sure they operate properly using test
equipment.
– Train local operators regarding the basic instructions for
correct use of the switchgear.
– Check to make sure the apparatus is ready to operate and
check the operating status of the electrical systems on the
supply side and load side of the switchgear.
Other checkpoints
Depending on the allocation of responsibilities, it may also be
necessary to check the following equipment in the vicinity of
the switchgear:
– Power cables
– Auxiliary cables
– Auxiliary power source
– Remote control system
– Complete earthing system
– Equipment in the switchgear installation room
– Characteristics of the switchgear installation room
− Pressure resistance in the case of an internal arc fault
− Ventilation
− Temperature
− Humidity.
5.13.2. Start-up
Instructions
– Comply with all the relevant safety regulations.
– Make sure that the switch-disconnectors and circuit-
breakers in the system are in the OPEN position.
– Remove any existing earthing and short-circuiting
connections in the critical operating area.
– Energize the power supply feeders.
– Connect the switchgear step by step, observing the signals
and indications.
– Where necessary, check that the conductors are in
phase when there are several incoming feeder lines and
switchgear sections.
– Take all the necessary measurements and check that
all functions that depend on the high voltage supply are
connected.
– Make sure that there are no anomalies of any kind.
Summary of Contents for GSec/IB
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