864-5091.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • Revision 06 93/214
Installation
24 Performing the power- frequency voltage test
The transport units are already tested at the factory at rated short-duration power-frequency
withstand voltage. On the customer´s request, the dielectric strength of the switchgear can
be tested on site. This is a repeat test at 80% of the values according to IEC 62271-1 and -200.
Preparing the power-
frequency voltage test
Due to the interlocking condition, busbar system 1 and busbar system 2 must be tested
separately from each other.
➭ Check the SF
6
gas filling (see page 128, "Checking the SF
6
gas filling").
➭ Before the test, remove non-disconnectable voltage transformers which are not suitable at
least for tests at 80% values according to IEC 62271-200.
➭ Cover the bushings at the panel with surge-proof caps.
Testing busbar system 1 ➭ Switch the three-position disconnector of busbar system 1 and the circuit-breaker in
the incoming panel to CLOSED position for the rated short-duration power-frequency
voltage test.
➭ Fit dummy plugs on all free sockets of the incoming panel.
➭ While testing circuit-breaker panels: Fit dummy plugs on all sockets of the panel to be
tested.
➭ Earth and short-circuit all test sockets of the voltage detecting system.
➭ Switch all other three-position disconnectors to READY-TO-EARTH position.
➭ Apply the power-frequency test voltage in a surge-proof way at the cable connection
bushing via test adapters.
✔ The rated short-duration power-frequency withstand voltage test can now be performed.
DANGER
High voltage! Danger! If the panel feeders are included in the rated short-duration power-
frequency withstand voltage test, the panel connections are live during the test.
➭ Keep a minimum distance of 3 m to the panel connections.
ATTENTION
If the rated short-duration power-frequency withstand voltage test is performed incorrectly,
the switchgear may be damaged.
➭ Do not perform a rated short-duration power-frequency withstand voltage test without
the manufacturer´s assistance.
ATTENTION
Already mounted non-disconnectable inductive voltage transformers which are not suitable at
least for tests at 80% values according to IEC 62271-200 will be damaged during the rated
short-duration power-frequency withstand voltage test.
➭ Remove already mounted non-disconnectable inductive voltage transformers.
➭ Do not install non-disconnectable inductive voltage transformers until the rated short-
duration power-frequency withstand voltage test has been completed.
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