Instructions For Circuit-Breaker Operation - ABB hd4 Installation And Service Instructions Manual

6.

Instructions for circuit-breaker operation

6.1. Safety indications
HD4 circuit-breakers ensure a minimum degree
of protection IP2X if installed under the following
conditions:
– fixed version, with protection netting
– withdrawable version, installed in a switchgear.
Under these conditions, the operator is guaranteed
against accidental contact with moving parts.
Should any mechanical operations be carried out
on the circuit-breaker outside the switchgear or
with the protection netting removed, be very careful
of any moving parts.
If the operations are prevented, do not force the
mechanical interlocks and check that the operation
sequence is correct.
The racking-in and racking-out operations of
the circuit-breaker must be carried out gradually
to prevent any impacts which might deform the
mechanical interlocks.
6.2. Operating and signalling parts
Fig. 6
Caption
1 Signalling device for state of SF6 pressure (on request)
2 Opening push button
3 Closing push button
4 Operator counter
5 Signalling device for circuit-breaker open/closed
6 Shaft for manual closing spring charging
7 Signalling device for closing springs charged/discharged
8 Resetting button for protection circuit-breaker of geared motor (on request)
12
6.3. Circuit-breaker closing and opening
operations (fig. 6)
Circuit-breaker operation can be manual or electrical.
a) Manual operation for spring charging
To manually charge the closing springs, it is necessary fully
insert the charging lever into the seat (6) and turn it clockwise
until the yellow indicator (7) appears.
The force which can normally be applied to the charging lever
fitted is 130 N. In any case, the maximum force which can be
applied must not exceed 170 N.
b) Electrical operation for spring charging
On request the circuit-breaker can be fitted with the following
accessories for electrical operation:
– geared motor for automatic charging of the closing springs
– shunt closing release
– shunt opening release.
The geared motor automatically recharges the springs after
each closing operation until the yellow indicator (7) appears.
Should there be no voltage during charging, the geared motor
stops and then starts recharging the springs automatically
when the voltage is on again. It is, however, always possible
to complete the charging operation manually.
c) Circuit-breaker closing
This operation can only be carried out with the closing springs
completely charged.
For manual closing, push the push button (3).
When there is a shunt closing release, the operation can
also be carried out with remote control by means of a
control circuit. The indicator (4) shows that closing has been
1
accomplished.
2
In case of earthing truck with making capacity, activate
4
the key lock (in the closed position) and remove the key.
7
This is to prevent accidental opening operations during any
5
maintenance work on the installation.
3
d) Circuit-breaker opening
6
For manual opening, push the push button (2).
8
When there is a shunt opening release, the operation can
also be carried out with remote control by means of a control
circuit. The indicator (4) shows that opening has been
accomplished.