Locking Devices - Siemens 3AH3 Operating Instructions Manual

Description
Conditions
Disconnected position
Operating position
CLOSED switching posi-
OPEN switching position
X CLOSED switching position
Y OPEN switching position
Z View from below
32

Locking devices

To lock vacuum circuit-breakers as a function of the switching position, the spring
drive mechanisms of the vacuum circuit-breaker can be equipped with a locking
device. This is also the case for vacuum circuit-breakers on switch gear trucks, in
withdrawable sections or with disconnectors.
The vacuum circuit-breaker must only be switched on in operating or disconnected
position. The operating or disconnected position is the position of the vacuum circuit-
breaker on the switchgear truck or withdrawable section in the switchgear. At the
same time, the vacuum circuit-breaker may be moved on the switchgear truck or
withdrawable section only when it is open.
Positions of the vacuum circuit-breaker in the switchgear
The isolating distance between the vacuum circuit-breaker contacts and the switch-
gear counter-contacts is attained fully.
The circuit-breaker is inserted fully into the switchgear and the vacuum circuit-
breaker contacts overlap completely with the switchgear counter-contacts.
Mechanical locking device (optional with spring drive mechanism)
A sensing and actuation component (b) on the system side detects the operating
position (CLOSED/OPEN) of the vacuum circuit-breaker.
If the vacuum circuit-breaker is closed, actuation of the system's sensing and actu-
tion ation component (b) is prevented. A mechanical system in the switchgear truck or
withdrawable section reliably blocks movements of the circuit-breaker on the switch-
gear truck or withdrawable section.
If the vacuum circuit-breaker is open, the sensing and actuation component (b) on
the system side actuates, via the stroke (a), the vacuum circuit-breaker's mechani-
cal locking device and reliably blocks closing of the vacuum circuit-breaker.
a
b
c + d
Fig. 43 Mechanical locking device
The installation dimensions (c + d) for the sensing and actuation component (b) are
in the dimension drawing.
Stroke (min. 10 mm, max. 30 mm)
Interrogation or actuation component (min. actuation force 70 N)
see dimension drawing
9229 9860 176 0E
2013-08-22