Interlocks - Siemens 8DJH Series Installation And Operating Instructions Manual

Description
Mechanical interlock
Padlock
Actuating opening
Possible switching operations
Electrical interlock
22
7.3

Interlocks

• The switching gate prevents switching straight from "CLOSED" to "EARTHED" or from
"EARTHED" to "CLOSED", as the operating lever must be re-inserted in the "OPEN"
position.
• The cable compartment cover (HV HRC fuse compartment cover) can only be removed
if the transformer feeder is earthed and the operating lever is removed.
The three-position switch-disconnector can only be switched from the "EARTHED"
position to another position if the cable compartment cover (HV HRC fuse
compartment cover) is fitted.
• Interlocks between the circuit-breaker and the three-position disconnector
- Circuit-breaker in OPEN position: The three-position disconnector can be closed and
opened. The circuit-breaker is locked out.
- Circuit-breaker in CLOSED position: The three-position disconnector cannot
be operated.
• The cable compartment covers can only be removed when the associated feeder
is earthed.
• A closing lock-out (option) in the ring-main or circuit-breaker feeder prevents
the three-position disconnector / switch-disconnector from being switched to
the "CLOSED" position if the cable compartment cover is removed.
• A de-earthing lock-out in the transformer panel (standard), the ring-main panel or
the circuit-breaker panel (option) prevents the three-position disconnector / switch-
disconnector from being switched from "EARTHED" to "OPEN" if the cable
compartment cover is removed.
• With stored-energy and circuit-breaker operating mechanisms, closing and opening is
not possible if the operating lever is inserted.
• The locking device (option) of the switching gate can be padlocked in all three switch
positions. The locking device can be padlocked so that no closing or no opening or
no earthing is possible. The padlock can also be fitted in such a way that none of
the three switching operations can be performed.
Down
Earthing switch
Only EARTHING and
DE-EARTHING possible
If the operating lever for the three-position switch is inserted, the motor operating
mechanism cannot be operated from remote or locally anymore.
Revision 03 * INSTALLATION AND OPERATING INSTRUCTIONS 8DJH * 500-8067.9
Center
-
No switching operations possible
Up
Disconnector/ Circuit-breaker/
switch-disconnector transformer switch
- Only CLOSING and - Charging the spring
OPENING possible
- Only possible if the
circuit-breaker is open