Locking Devices - Siemens 3AH41 Operating Instructions Manual

Description
Conditions
Disconnected position
Operating position
CLOSED switching
position
OPEN switching position
X CLOSED switching position
Y OPEN switching position
Z View from below
30

Locking devices

To lock vacuum circuit-breakers as a function of the switching position, the spring
charge 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.
It must only be possible to switch on the vacuum circuit-breaker 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, it must only be possible to move the vacuum circuit-
breaker on the switchgear truck or withdrawable section when it is open.
Positions of the vacuum circuit-breaker in the switchgear
The isolating distance between the vacuum circuit-breaker contacts and the
switchgear 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 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
actuation component is prevented. A mechanical system in the switchgear truck or
withdrawable section reliably blocks movements of the circuit-breaker on the
switchgear truck or withdrawable section.
If the vacuum circuit-breaker is open, the sensing and actuation component on the
system side actuates the vacuum circuit-breaker's mechanical locking device and
reliably blocks closing of the vacuum circuit-breaker.
a Stroke (min. 10 mm, max. 30 mm)
b Interrogation or actuation component (min. actuation force 70 N)
c + d see dimension drawing
Fig. 39 Mechanical locking device
9229 9862 176 0D
2013-08-28