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7.2 Test procedure
Testing the off-circuit condition
In switchgear panels which are not equipped with
capacitive voltage indication, checking the off-
circuit condition is carried out with a HV tester on
the isolating contacts in the isolating tulips, after
the corresponding upper shutter or lower shutter
has been opened. Shutter opening can be carried
out by means of a module. If the panels are
equipped with capacitive voltage indication, this
can be used to check the off-circuit condition. In
this case, proceed according to the
manufacturer’s instructions or the indicators.
(Optionally, switchgear can be equipped with
various types of indicators from differents
manufacturers). In case of any doubt about
correct operation of capacitive voltage
indication, the off-circuit condition must be
checked using a HV tester.
Checking the off-circuit condition must always be
carried out in compliance with the relevant safety
regulations and local operating conditions!
Current and voltage tests
The testing and earthing module is available for
carrying out current and voltage tests. It is also
suitable for supplying primary current to any
current transformers which may be fitted during
measurements in the protection circuit and, for
example, for application of a test voltage during
insulating tests.
• Isolate and secure the working area in
accordance with the IEC safety regulations.
• For primary current supply, fix the
connecting cable of the est transformer to
the contact pins.
• For AC voltage tests, ball is required on the
contact pin. The bore in the ball is used for
connection of the voltage supply.
• For current tests, for example of small
connected generators, the short-circuit
bridge must be fixed onto the contact pins.
Note:
With voltage tests at power frequency withstand
voltage and/or impulse voltage, carry out the
following procedure:
Disconnect any voltage transformers and surge
arresters and cover them with an insulating plate.
—
7. Operation of the switchgear
Figure 181:
1 Top shutter
2 Contact system
3 Isolation tulip
4 Contact arm, with insulating sleeve
Figure 182:
1 Isolating tulip
2 Isolating contact
3 Lower shutter
Withdrawable part during insertion into
the service position, shutters not yet fully open
View inside the circuit-breaker
compartment, withdrawable part removed, shutters open
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