92 ZX2 GAS-INSULATED MEDIUM VOLTAGE SWITCHGEAR
Important notes
• Dismantle plugged-in transformers in
the relevant outgoing feeder as
described in section 3.3.7.1 or remove
the blanking plugs from the test
sockets.
• Close off any free cable sockets with
blanking plugs.
• Dismantle any surge arresters in the
relevant outgoing feeder in accordance
with the manufacturer’s instructions.
• Short-circuit the sockets of all
capacitive indicator systems of the
relevant panel using short-circuiting
plugs.
• Short-circuit the cores of the current
transformers concerned which are
located in gas compartments and
ground them.
Panel with inner cone sockets
• Fit test plugs or test cables to test sockets of
the panel.
Panel with outer cones
• Fit the high voltage testing set to the (outer
cone) plug system of the panel in accordance
with the manufacturer’s instructions.
Test sequence
• Establish the test circuit in accordance with the
manufacturer’s directions for the test
apparatus.
• Cancel the grounding of the system section to
be tested before applying the test voltage by
opening the circuit-breaker.
• Perform the cable test in accordance with the
manufacturer’s directions for the test
apparatus.
• Ground the system section on completion of
individual tests and on conclusion of testing by
closing the circuit-breaker.
• Dismantle the test cables or test plugs.
• Refit any dismantled surge arresters and
voltage transformers.
• 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.
• Remove the short-circuiting bridges and the
grounding connection from the secondary
terminals of the current transformers.
• Remove the short-circuiting plugs from the
capacitive indicator.
• Refit the cover on the cable termination
compartment.
6.2. Testing for the in-phase condition
Testing for the in-phase condition, e.g. when
there is more than one incoming feeder, can be
performed with a suitable phase comparator at
the measuring sockets of the capacitive voltage
indication system.
The phase comparator must comply with
IEC 61243-5 and correspond to the technical
design of the indicator system used.
Important note
Observe the instruction manual for the
phase comparator.
6.3. High voltage tests
Panels with inner cone
The test voltage is applied via the test socket on
the panel (inner cone, size 2).
Panels with outer cone
Direct access to the conductors via the fitted
cable connectors is available for the performance
of high voltage tests. The test voltage is applied
through suitable test sets for the outer cone plug
system used.
6.3.1. Cable tests with DC-voltage
Important note
Do not exceed the maximum test
voltages and the maximum test duration
Hazard warning
Comply with the safety regulations to
• Isolate the panel whose cables are to be
tested in accordance with section 5.
Test the outgoing feeder for the off-
circuit condition as described in
section 6.1.
• Ground the outgoing feeder and secure
the working area in accordance with
• Switch the mcbs (
1
operating mechanisms off in order to
prevent the outgoing feeder being
energized by remote control.
• Dismantle the cover on the relevant cable
termination compartment.
1. mcb: miniature circuit breaker.
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