Structure; Structure Of The Operating Mechanism; Structure Of The Control Module; Storage Capacitor - ABB VM1 Instruction Manual

Structure

2
2.1

Structure of the operating mechanism

(Figures 9/13 to 9/16 and 9/28)
The operating mechanism is of the magnetic type.
It fundamentally consists of the magnetic actuator
10, the control module 27 with sensor systems, the
storage capacitor(s) 26 and the linkages which
transmit the force to the breaker poles.
In addition, there are supplementary components
for emergency manual opening and the controls
located on the front of the enclosure.
The actuator 10 acts on the three breaker poles via
lever shaft 18. The storage capacitor 26 provides
the necessary actuating energy on demand.
The mechanical switch positions of the circuit-
breaker are detected by two sensors 15 and 16
directly at lever shaft 18.
There are rating plates 7 with the main data of the
switching device on front plate 1.1, and at the left
side in the mechanism enclosure.
The basic version of the magnetic actuator
mechanism is fitted with the following controls and
instruments:
• ON push-button 3
• OFF push-button 4
• Emergency manual OFF 8
• Mechanical position indicator 6
• Mechanical operating cycle counter 5
• Signal lamp for switching readiness 2
("Ready" lamp).
The following may also be installed:
• Five-pole auxiliary switches for switch position
signal: -S3 and -S5.

2.1.1 Structure of the control module

(Figures 9/16 and 9/18a)
Control module ED 2.0 produces a voltage of
80 V from any supply voltage within the
input voltage range, with which the storage
capacitor(s) is/are charged. This is also used to
generate a voltage of 18 V to supply the breaker
controller.
The circuit-breaker controller consists of:
• a microprocessor,
• electronic optocouplers for input,
• relays for output,
• power electronics to control the actuator
coils.
6

2.1.2 Storage capacitor

(Figures 9/16, 9/18 b and 9/28)
The energy for operation of the circuit-breaker is
stored electrically in a capacitor. Circuit-breakers
for breaking currents of 31.5 kA and above are
fitted with two capacitors. The capacitors are
designed in such a way that the energy for an
OFF-ON-OFF operating cycle is provided without
recharging.
The energy stored by the capacitor is permanently
monitored. This is achieved by measuring the
capacitor voltage.
The "Ready" lamp indicates that supply voltage is
applied and the circuit-breaker is ready for the
impending switching operation (see also sections
3.1.5 and 6.2).
The energy stored in the capacitors is one criterion
for illumination of the "Ready" lamp:
• Case 1: Breaker in the OFF position.
The energy available is sufficient for an ON and
an OFF switching operation.
• Case 2: Breaker in the ON position.
– The energy available is sufficient for an OFF
switching operation.
– The energy available is sufficient for an OFF
switching operation in the first 60 or 120
seconds (from 31.5 kA) after failure of the
auxiliary power supply (see also section 6.4).
If the energy stored is not sufficient, the "NOT
READY" contact is closed, indicating that the switch
is not ready for operation.

2.1.3 Sensor system

(Figures 9/15 and 9/16)
The systematic use of sensors permits control of
the circuit-breaker without auxiliary switches.
Two inductive proximity switches 15 and 16 are
used to detect the mechanical limit positions,
which also provide for self-monitoring of the
system.
2.2

Structure of the breaker poles

(Figures 9/9, 9/11 and 9/14)
The poles in column design are mounted on the
bracket-shaped rear part of mechanism enclosure 1.
The live parts of the breaker poles are enclosed in
cast resin and protected from impacts and other
external influences.
With the breaker closed, the current path leads
from the upper breaker terminal 25 to the fixed
contact 24.2 in the vacuum interrupter 24, then via
the moving contact 24.1 and the flexible connector
21 to the lower breaker terminal 22.
The switching motions are effected by means of
the insulated link rod 19 with internal contact force
springs 20.