ABB AMVAC Installation And Operation Manual page 15

C B C
IRCUIT REAKER
All the conditions for control of the magnetic actuator mechanism are defined in a permanently programmed logic
module. These conditions are:

Auxiliary voltage must be applied to the AC/DC converter.

The storage capacitors must have sufficient charge for the next switching operation.

The moving contacts in the circuit breaker poles must be in a defined CLOSE or OPEN limit position.

The closing coil can only be activated with the circuit breaker in the OPEN position and there is sufficient energy.

The opening coil can only be activated with the circuit breaker in the CLOSE position and there is sufficient energy.

Closing is blocked when an opening command is simultaneously active.

Activation of the closing coil can be disabled by an external blocking signal.

The antipumping system ensures that, when a closing command is applied and followed by an opening command,
only one CLOSE-OPEN switching operation is performed.
command has to be cleared and must be issued again.

Deactivation of the opening or closing coil takes place when the relevant limit position has been reached.

All close signals must be by momentary contacts with a close time of 6-300ms.
Switch Position: Storage Capacitor Energy For:
OPEN CLOSE and OPEN
CLOSE OPEN
O
PENING AND CLOSING PROCEDURE
The opening and closing processes are initiated either by remote control via momentary closing contacts or locally by
manual operation of push-buttons (3) or (4).
In the closing process, the armature motion acts directly via the lever shaft (18) on the moving contact (24.1) until the
vacuum interrupter contacts meet.
In the full motion sequence, the spring arrangement (20) is tensioned to 100% and the necessary contact force thus
applied. The available overtravel is greater than the maximum contact burn-off throughout the life of the vacuum
interrupter.
A
UTORECLOSING SEQUENCE
The operating mechanism is fundamentally prepared for autoreclosing, and with the short recharging time of the storage
capacitor it is also suitable for multi-shot autoreclosing.
V I
ACUUM NTERRUPTER
Due to the extremely low static interrupter chamber pressure of 10
required to achieve a high dielectric strength. The vacuum arc is extinguished on one of the first natural current zeros.
Due to the small contact gap, high conductivity of the metal vapor plasma, and short arcing time, the associated arc
energy is extremely low, which has advantageous effects on the life of the contacts and thus on that of the vacuum
interrupters.
STRUCTURE AND FUNCTION
:
ONTROL
:
(Figures 2a to 2c, Page 16)
:
Q P
UENCHING RINCIPLE
1VAL050601-MB Rev C
For the next closing operation, the active closing
:
-4 -8
to 10 mbar, only a relatively small contact gap is
15