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

M E D I U M V O LTA G E P R O D U C T S
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2. Structure

2.1
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 (figure 9/17):
• 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:
- BB1 and -BB3.
2.1.1
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.
Structure of the operating
mechanism (Figures 9/11 to
9/14 and 9/26)

Structure of the control module

(Figures 9/14 and 9/16a)
2.1.2

Storage capacitor

(Figures 9/14, 9/16b and 9/26)
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 6.5).
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 9/13 and 9/14)
The systematic use of sensors permits control of
the circuitbreaker 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.
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