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! Check the SF
6
-gas filling (see Page 12, "Checking the SF
6
-gas pressure").
! Earth all disconnectable inductive voltage transformers at the feeder through the
associated voltage transformer disconnector.
! Before the test, remove non-disconnectable voltage transformers which are not
suitable for tests at 80%-values according to IEC 60044-2.
! Close the bushings at the panel with surge-proof covers.
! For the rated short-duration power-frequency withstand voltage test, switch the
circuit-breaker and the three-position disconnector in the incoming panel to CLOSED
position.
! Close all free bushings in the testing section with surge-proof covers.
! Earth and short-circuit all test sockets of the voltage detection 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.
r Now you can perform the rated short-duration power-frequency withstand voltage
test.
Performing the power- fre-
quency voltage test
! Apply 80 % of the rated short-duration power-frequency withstand voltage
consecutively to phases L1, L2 und L3 for 60 seconds each.
Completing the power-fre-
quency voltage test
! Switch the voltage transformer disconnector of the disconnectable voltage
transformers to CLOSED position.
! After the test, mount non-disconnectable voltage transformers which are not
suitable for tests at 80%-values according to IEC 60044-2.
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 for tests at 80%-values according to IEC 60044-2 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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