Voltage Test Of The Main Circuit - ABB ZX0 Manual For Installation And Operation

5.3.2

Voltage test of the main circuit

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In the course of testing, the test voltage is applied
in sequence to every conductor in the main circuit,
with the other conductor earthed. Do not exceed the maxi-
mum test voltage (80 % of the rated short-duration power
frequency withstand voltage (U
Comply with the test conditions as set out in IEC 62271-200.
In the case of a sectionalizer (without circuit-
breaker), application of the test voltage to the
busbar in operation is not permissible. Earth the
system section concerned for the duration of the test (figure
5.3.2.1).
Fig. 5.3.2.1: Voltage test in case of a sectionalizer (without circuit-breaker)
Earthed busbar
Comply with the safety regulations to EN 50110.
− Isolate the switchgear section to be tested in accordance
with section 4.
− est the switchgear section for the off-circuit condition as
described in section 5.1.
− Earth the switchgear section and secure the working area
in accordance with section 4 and EN 50110 standard.
− Switch the mcbs of the relevant operating mechanisms
1)
off in order to prevent the switchgear section being ener-
gized by remote control.
− Dismantle the cover on the relevant cable termination com-
partment.
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Isolate all voltage transformers inside the switch-
gear section to be tested by operating the
isolating device (see section 4.5).
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Remove plugged-in voltage transformers inside the
switchgear section to be tested as described in
section 2.3.5.2
mcb: miniature circuit-breaker
1)
66 | Manual ZX0 HB 600 en - Revision 05
) as stated on the type plate).
D
Busbar to be tested
− Close off free inner cone sockets (for plugged-in voltage
transformers) (Section 2.4.3).
− Remove any surge arresters fitted in accordance with the
manufacturer's instructions.
− Close off free outer cones within the system section to be
tested with blanking plugs in accordance with the manu-
facturers instructions.
− Short-circuit the secondary terminals of the block-type
current transformers installed in the test circuit (in section-
alizers, risers and metering panels) and earth them.
− Short-circuit the sockets for the capacitive indicator
system in the relevant switchgear section using the short-
circuiting plug.
− Fit the high voltage testing set to the (outer cone) cable
connector system of the panel to which the test voltage is
to be applied, following the manufacturer's instructions.
− Connect the test transformer to the test plug or test cable
and earth the other two phases of the test system.
− Connect the second terminal of the test transformer to
system earth.
− Connect other sections of the switchgear to be tested by
operating the relevant disconnectors and circuit-breakers.
− Cancel the earthing of the system section to be tested
before applying the test voltage.
− Perform the high voltage test.
− Earth the system section on completion of individual tests
and on conclusion of testing.
− Dismantle the test cables or test plugs.
− Fit any surge arresters and voltage transformers required.
− Close off any free test sockets and cable sockets with
blanking plugs.
− Close off free outer cones with insulating blanking plugs in
accordance with the manufacturer's instructions.
− Cancel any isolation of voltage transformers.
− Remove the short-circuiting plugs from the capacitive
indicator.
− Refit the cover on the cable termination compartment.