6. TEST PROCEDURES 93
6.3.2. Voltage test of the main circuit
Important note
In the course of testing, the test voltage
is applied in sequence to every conductor
in the main circuit, with the other
conductors grounded. Do not exceed the
test voltage levels (80 % of the rated
short-duration power frequency
withstand voltage (U
D
Hazard warning
In the case of a sectionalizer (without
voltage to the busbar in operation is not
permissible. Ground the system section
concerned for the duration of the test
Hazard warning
Comply with the safety regulations to
• Isolate the section to be tested in
accordance with section 5.
• Test the switchgear sections for the
off-circuit condition as described in
section 6.1.
• Ground the section to be tested and
secure the working area in accordance
• Switch the mcbs (
1
operating mechanisms off in order to
prevent the switchgear section being
energized by remote control.
Important notes
• If there are busbar metering panels
within the system section to be tested,
isolate the relevant voltage
transformers in the metering panels by
operating the isolating device (see
• Dismantle plugged-in voltage
transformers within the system section
• Dismantle any surge arresters within
the system section to be tested in
accordance with the manufacturer’s
instructions.
•
within the system section to be tested
with insulating blanking plugs.
• Close off free outer cones within the
system section to be tested with
insulating blanking plugs in accordance
with the manufacturer’s instructions.
• Short-circuit the sockets of all
capacitive indicator systems, which are
connected to the section intended for
testing, using short-circuiting plugs.
• Short-circuit the cores of the current
transformers concerned which are
located in gas compartments and
ground them.
Application of test voltage via a panel with inner
cone sockets
• Fit test plugs or test cables to test sockets or
free cable sockets in the panel to which the test
voltage is to be applied.
Application of test voltage via a panel with
outer cones
• Fit the high voltage testing set to the (outer
cone) plug system of the panel to which the test
voltage is to be applied, in accordance with the
manufacturer’s instructions.
—
Fig. 6.3.2.1:
Voltage test in case of a
sectionalizer
(without circuit-breaker)
Grounded
busbar
Busbar
to be tested
• Dismantle the cover on the relevant cable
termination compartment.
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