Eaton SVS/12, User Manual

Page: 27 / 138

SVS/12
994.530 G01 02 27
2.4 Safety (system-specific)
2.4.1 Interlocks, 630 A panels
Definitions

Panel in the "operating position" means:
the disconnector is in the busbar position and the load-
break switch or circuit-breaker is closed

Panel in the "earthing position" means:
the disconnector is in the earthing position and the
load-break switch or circuit-breaker is closed

Panel in the "intermediate position" means:
the disconnector is in the busbar or earthing position
and the load-break switch or circuit-breaker is open.
Disconnector

The disconnector can only be operated if the load-
break switch or circuit-breaker is open.
Load-break switch or circuit-breaker panel

The load-break switch or circuit-breaker can only be
closed if the disconnector is fully in the busbar position
or fully in the earthing position.

A panel has a padlock to prevent opening of:

the load-break switch in the operating position and
in the earthing position

the circuit-breaker only in the earthing position

As an option, an interlock can be provided on the
access door of the cable compartment:

This means that the door can only be opened in the
earthing position.
In that case, the load-break switch can no longer be
locked to prevent opening in the operating position.

The cable entry port of the 17.5 kV cable terminal block
can only be opened if the cable is earthed, that is to
say, if the field is in the earthing position.

A scissor-type interlock with padlock is available as an
option. This scissor-type interlock can be used to lock
the load-break switch or circuit-breaker in an
intermediate position.
Load-break switch/fuse panel

On the load-break switch/fuse panel, access to the fuse
holders is only possible if the disconnector is in the
earthing position and the load-break switch is open.

In this position, the load-break switch cannot be closed
if the disconnector is in the earthing position.
Bus-section panel

On a bus-section panel, the load-break switch or circuit-
breaker cannot be closed if the disconnector is in the
earthing position.

The load-break switch can be locked against opening
with a padlock.

The circuit-breaker cannot be locked with a padlock.
Metering panel

A padlock can be provided on the access door of a
metering panel.