Circuit-Breakers For Zs8.4 Switchgear; Prevention Of Traverse With Circuit-Breaker Closed; Prevention Of Traverse With Socket-Plug Disconnected - ABB VD4 Installation And Service Instructions Manual

Circuit-breakers for ZS8.4 switchgear (fig. 5b)
The socket (13) takes the connector (plug) placed in the switchgear.
The slides (9) for operating the segregation shutters of the medium
voltage contacts of the switchgear are fixed on the sides of the circuit-
breaker.
The crosspiece with the handles (17) for hooking up the circuit-breaker
for the racking-in/out operations by means of the special operating
lever (16) is mounted on the front part of the circuit-breaker truck.
The circuit-breaker is completed with the isolating contacts (8).
The withdrawable circuit-breaker is fitted with special locks, described
below (see fig.5c - 5d).

1) Prevention of traverse with circuit-breaker closed

With the circuit-breaker closed, the feeler pin (16 - fig. 5c) prevents
the shutter sliding (19- fig. 5c) and therefore insertion of the lever (20-
fig. 5c) for traverse of the apparatus.
Fig. 5c
23
Fig. 5d
16

2) Prevention of traverse with socket-plug disconnected

When the plug is not inserted in the socket (13), the stem (21 - fig. 5c)
prevents the plate (22 - fig. 5c) lifting and traverse of the apparatus.
3) Prevention of switchgear door closing with socket-plug
disconnected (*)
When the plug is not inserted in the socket (13), the feeler pin (23 - fig.
5d) prevents door closing.
4) Prevention of circuit-breaker racking-out with the socket-
plug connected (*)
When the plug is inserted in the socket (13), the lock bolt (29 - fig. 5d)
hits the pin (30 - fig. 5d) preventing the apparatus from being racked
out of the switchgear.
19 20
29 30
22 21
17