Operation Of The Switchgear; Commissioning; Preparatory Work; Start-Up - ABB VD4 Instruction Manual

Operation of the switchgear

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Note on safety at work
• The switchgear may only be operated by spe-
cially trained personnel who are familiar with the
characteristics of the particular device.
• Observe the relevant instructions in section 1.2.
• Due to safety reasons, the circuit-breaker has
to be treated as "switched on" if the switching
position can not be clearly determinated.
In this case all high voltage connections to
the breaker have to be de-energized and zero
potential on the primary side of the breaker has
to be confirmed prior to commissioning, opera-
tion, maintenance or repair work.
4.1

Commissioning

4.1.1 Preparatory work

(Figures 3/1 and 3/3)
In preparation for commissioning, the following work
should be carried out prior to connection with the
high-voltage power supply:
• Check the general condition of the switchgear
for detrimental circumstances of all kinds.
• Perform a visual examination of the switching
devices, withdrawable parts, isolating contacts,
insulating parts, etc.
• Check the connection of the main earthing bar
with the station earthing conductor (DIN VDE
0141).
• Check the paintwork for damage and touch up
as described in section 5.4 where necessary.
• Remove all material residues, foreign bodies and
tools from the switchgear.
• Clean the switchgear, rubbing down insulating
parts with a clean, soft, non-fraying and dry cloth.
Remove greasy or adhesive dirt as described in
section 5.3.
• Properly refit all covers, etc., removed during
assembly and testing processes.
• Transport caps (13.9) on the poles of vacuum
circuit-breakers, where fitted, must be removed.
• Lifting lugs (13.13) for high current circuit-break-
ers, if still fitted, must be removed.
• Perform AC voltage testing on the main circuits
to VDE 0670, Part 6 (IEC 60298) as far as neces-
sary. Pay special attention during this pro cedure
to voltage transformers and cables etc.
• Turn the auxiliary and control voltage on.
• Carry out test operations of switching devices
manually or by electrical control, and simul-
taneously observe the relevant position indica-
tors.
• Check mechanical and electrical interlocks for
effectiveness, without using force.
• Set the protective devices in the panel to the
required values, and check their functioning with
test equipment.
• On motor-driven withdrawable parts, check the
direction of rotation of the travel motors as de-
scribed in section 5.5.5.
• For any further questions on the functions of the
withdrawable circuit-breaker part and its testing,
see section 5.5.
• Instruct the local operators in the fundamental
details of regular handling of the switchgear.
• Check on the operational readiness and switching
status of upstream and downstream electrical
installations.
From areas bordering on the switchgear, in accor-
dance with responsibilities, check on the following
where applicable:
• Power cables
• Auxiliary cables
• Supply voltage source
• Remote control
• Entire earthing installation, according to DIN
VDE 0141
• Switchroom equipment
• Switchroom condition

4.1.2 Start-up

• Comply with all relevant safety regulations.
• Ensure that the circuit-breakers and switch
disconnectors in the switchgear are in the OFF
position.
• Remove any existing earthing and short-circuiting
connections in the critical switching area.
• Energize the feed cables.
• Connect the switchgear, step-by-step, observing
the signals and indicators.
• Check that the relevant conductors are in phase,
as far as necessary when several incoming feeder
cables and switchgear sections are concerned.
• Carry out all measurements and check all func-
tions dependent on the high voltage power supply
being connected.
• Watch out for irregularities of any kind.
4.2

Switching operations

Perform switching operations with the front doors
shut.

4.2.1 Withdrawable circuit-breaker part

(Figures 3/1, 3/4, 4/1 to 4/4)
Manual insertion from the test/disconnected posi-
tion to the service position:
• Connect control wiring plug (10.2).
• Close the front door.
• Ensure that the circuit-breaker is in the OFF
position.
• Fit the crank (121) on square spigot (18.1) of
the spindle mechanism (18).
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