Removing And Installing Non-Disconnectable Busbar Voltage Transformers; Removing Non-Disconnectable Busbar Voltage Transformers - Siemens 8DA Installation Instructions Manual

Preparing removal
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11 Removing and installing non-disconnectable busbar voltage
transformers
If a power-frequency voltage test must be performed before putting the switchgear into
operation, already mounted non-disconnectable inductive voltage transformers which
are not suitable for tests at 80%-values according to IEC 60044-2 must be removed.
The work operations described hereafter apply to all voltage transformer types. Special
work operations for individual voltage transformer types are pointed out.
11.1

Removing non-disconnectable busbar voltage transformers

DANGER!
High voltage! Danger! Before starting installation work at the busbar voltage
transformers, the busbar must have been isolated and earthed.
!
Isolate and earth the busbar.
ATTENTION!
Sensitive parts of the switchgear may be damaged during installation work at the
busbar and the busbar housings.
!
While working at the busbars or the busbar housings, prop up only on the
aluminium housings and the supporting frame.
!
Do not prop up on sensitive parts of the switchgear like gas pipes, rupture
diaphragms, shafts, etc.
ATTENTION!
While working on metal-coated voltage transformers, the coating may be scratched or
damaged. Then, the voltage transformers are not safe-to-touch anymore.
!
Work carefully while mounting metal-coated voltage transformers.
!
Take care not to scratch or damage the metal coating.
!
Isolate and earth the busbar.
!
Verify safe isolation from supply.
!
Remove the low-voltage plug connector at the voltage transformer.
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