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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
Preparing removal
! Isolate and earth the busbar.
! Verify safe isolation from supply.
! Remove the low-voltage plug connector at the voltage transformer.
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.
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