Description
9229 9947 176 0C
29
2013-03-28
Interlocking 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 an
interlocking device. This is also the case for vacuum circuit-breakers on switch gear
trucks, in withdrawable sections or with disconnectors.
Conditions
The vacuum circuit-breaker must be closable only in the operating or disconnected
position (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
Disconnected position
The isolating distance between the vacuum circuit-breaker contacts and the
switchgear counter-contacts is attained fully.
Operating position
The circuit-breaker is inserted fully into the switchgear and the vacuum circuit-
breaker contacts overlap completely with the switchgear counter-contacts.
Mechanical interlock (optional with spring drive mechanism)
An interrogation and actuation component (b) on the system side scans the
operating position (CLOSED/OPEN) of the vacuum circuit-breaker.
CLOSED position
If the vacuum circuit-breaker is closed, actuation of the system's interrogation and
actuation component (b) 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.
OPEN position
If the vacuum circuit-breaker is open, the interrogation and actuation component (b)
on the system side actuates, via the stroke (a), the vacuum circuit-breaker's
mechanical interlock and reliably blocks closing of the vacuum circuit-breaker.
Fig. 38
Mechanical interlock
The installation dimensions (c + d) for the interrogation and actuation component (b)
are in the dimension drawing.
X
CLOSED position
a
Stroke (min. 10 mm, max. 30 mm)
Y
OPEN position
b
Interrogation or actuation component (max. actuation force 70 N)
Z
View from below
c + d
see dimension drawing