Circuit-Breaker Operation; Maintenance; General - ABB VM1 Instruction Manual

6.4

Circuit-breaker operation

(Figures 9/19 to 9/22)
The power supply has been established when the
"Ready" lamp 2 lights up.
Please also note the remarks in Section 3.1.5.
1. Closing:
Remote control by applying a voltage to input
-Y3 (see sections 10.1.1a and 6.2) or locally by
pressing ON push-button 3.
2. Opening:
Remote control by applying a voltage to input
-Y2 (see also sections 10.1.1a and 6.2) or locally
by pressing OFF push-button 4.
3. Opening in case of power failure:
a) Opening via the remote control system or by
pressing push-button 4 is initially still possible:
– up to 60 seconds for breaking currents up
to 25 kA
– up to 120 seconds for breaking currents up
to 31.5 kA.
b) Manual emergency opening is possible
beyond these times.
Insert emergency manual operation lever 28
into socket 8 in the front plate and turn it anti-
clockwise to open the circuit-breaker.
During this the auxiliary spring 29 on the lever
28 will be charged at first. After a movement
of about 65° to 70° a resistance must be
overcome which is generated from the rem-
oval of the armature in the actuator. Then the
circuit-breaker is swiched off. A further
rotation will be a free movement.
c) On power failure and after expiry of the times
stated under 3a), the circuit-breaker remains
in its current position. If an automatic switch-
off is desired immediately on expiry of the
times stated under 3a), this behaviour can be
effected by activating DIP switch I 1004/1
(see figure 9/18a, "AUTO-OFF on declining
capacitor voltage").
4. Closing on failure of the supply voltage:
Closing is not appropriate and not possible.
5. Operating cycle and position indicators on the
switching device:
After each operating cycle (ON-OFF), the operating
cycle counter 5 is incremented by one full digit.
On termination of a switching operation, the
position indicator 6 displays the relevant switch
position.
6. Anti-pumping system:
• The circuit-breaker controller ensures that
closing of the circuit-breaker is blocked when
an opening command is active.
• When closing on a subsequent opening
command, further closing with the still active
closing command is blocked. The closing
command must be issued again for the next
closing operation.

Maintenance

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Maintenance serves to preserve trouble-free
operation and achieve the longest possible working
life of the switchgear. In accordance with
DIN 31 051 and IEC 61208, it comprises the
following closely related activities:
Inspection: Determination of the actual condition
Servicing: Preservation of a functional condition
Repair: Measures to restore the functional
condition
7.1

General

All vacuum circuit-breakers are characterised by a
simple and robust construction. They have a long
life expectancy. There is no adverse effect on the
vacuum, even from frequent switching of operating
and short-circuit currents.
The typical life expectancy of a VM1 vacuum
circuit-breaker is determined by:
• Maintenance-free, potted vacuum interrupters
for up to 30,000 mechanical operating cycles.
• Magnetic actuator mechanism, maintenance-
free under normal service conditions:
– up to 100,000 operating cycles for all
breakers with a breaking current ≤ 25 kA and
a rated current ≤ 1250 A.
– up to 50,000 operating cycles for all breakers
with a rated current of ≥ 1600 A (high-current
breakers).
– up to 50,000 operating cycles for all breakers
with a breaking current ≥ 31.5 kA.
• Maintenance-free control module with sensors
and without auxiliary switches.
• Auxiliary switch ON/OFF position signalization
(optional) up to 30,000 switching cycles.
• Withdrawable part: With careful operation and
appropriately performed inspection work, up to
1000 movement operations can be achieved.
See also IEC 60298.
The service life data fundamentally apply to all
components which are not directly influenced by
the operator.
Components operated manually (movement of the
withdrawable part, etc.) may deviate, depending on
how they are handled.
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