Siemens 8DA Installation Instructions Manual page 37

Performing the power- fre-
quency voltage test
Completing the power-fre-
quency voltage test
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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.
!
Check the SF -gas filling (see Page 12, "Checking the SF
6
!
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.
!
Apply 80 % of the rated short-duration power-frequency withstand voltage
consecutively to phases L1, L2 und L3 for 60 seconds each.
!
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.
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-gas pressure").
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