Interlocks - Siemens 8DJH Installation And Operating Instructions Manual

3 | Description
Fig. 7: Front operating mechanism box of circuit-breaker panel
type 1.1

3.6 Interlocks

14/174
The vacuum circuit-breaker consists of a vacuum interrupter unit with integrated three-position
disconnector located in the switchgear vessel, and the associated operating mechanisms.
The vacuum circuit-breaker is a circuit-breaker for automatic reclosing.
Mechanical interlocks
▪ Separate actuating openings for DISCONNECTING, EARTHING and spring charging:
Switching straight from CLOSED to EARTHED position and from EARTHED to CLOSED position
is not possible, as the operating lever must be re-inserted in the OPEN position.
The spring in transformer panels and circuit-breaker panels is charged in a separate
actuating opening.
▪ Cable compartment interlock:
To remove the cable compartment cover, the feeder must be earthed.
▪ Locking device (option):
The locking device (option) of the three-position disconnector / three-position switch-
disconnector can be locked in all three switch positions.
The locking device can be padlocked so that no closing, 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.
In transformer panels and circuit-breaker panels, the actuating opening to charge the spring
can also be locked.
▪ Closing lockout (option):
When the cable compartment cover is removed, the three-position disconnector / three-
position switch-disconnector cannot be switched to CLOSED position. Switching from
EARTHED to OPEN position is possible, e.g. to test the cables without removing the cable
plugs.
▪ De-earthing lockout (option):
When the cable compartment cover is removed, the three-position disconnector / three-
position switch-disconnector cannot be switched from EARTHED to OPEN position.
8DJH • Installation and Operating Instructions • Version 11 • 500-8384.9
1 Ready-for-service indicator
2 Auxiliary switch at the three-position disconnector
(option)
Motor for three-position disconnector (option)
3
Actuating opening for disconnector
4
Position indicator for three-position disconnector
5
Three-position switch-disconnector locking device
6
Actuating opening for earthing switch
7
Sockets for capacitive voltage detecting system
8
Opening spring
9
"Spring charged" indicator
10
Operations counter
11
Position indicator for circuit-breaker
1 2
OFF pushbutton for circuit-breaker
1 3
ON pushbutton for circuit-breaker
14
Actuating opening for "spring charging"
1 5
Closing spring
16