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VM1/A/P
- INSTALLATION AND SERVICE INSTRUCTIONS ANSI: ... 15 KV; ... 2000 A; ... 31.5 K A
—
8. Maintenance
8.1. General
Vacuum circuit breakers are characterised by
simple, sturdy construction and long life.
The drive is maintenance-free for its whole
operating life and only requires functional
inspections.
The vacuum interrupters are maintenance-free for
their whole operating life.
Vacuum interruption does not produce harmful
effects even when there are frequent trips at the
rated and short-circuit current.
The servicing interventions and their aim depend on
the environmental conditions, on the sequence of
operations and on the trips under short-circuit.
Note
For maintenance work, respect the following Standards:
•
the relative specifications indicated in the “Standards and Specifications”
chapter;
•
regulations for safety in the workplace indicated in the “Putting into
service and operations” chapter;
•
regulations and specifications of the country where the apparatus is
installed.
The maintenance operations can only be carried out
by trained personnel who respect all the safety
regulations. Furthermore, it is recommended that
ABB service personnel should be called in, at least
to check the service performances, and for any
repair work.
During maintenance work, turn the power supply off
and put the apparatus under safe conditions.
CAUTION
Before carrying out any operations, always
make sure that the circuit breaker is open,
the capacitor discharged and that it is not
supplied (Medium voltage circuit and
auxiliary circuits).
8.2. Maintenance on VM1/A/P
circuit breakers
CAUTION
The storage capacitor may be charged in the
disconnect and withdrawn positions. Verify
that the circuit breaker is open and the
storage capacitor (s) is (are) discharged
before removing the front cover.
VM1/A/P circuit breakers are designed for a
minimum amount of maintenance. Circuit breakers
in a clean, non-corrosive environment require only
annual inspection. Dusty or corrosive environments
require inspection more often at the discretion of
the user. Following each interrupted fault
inspection is required.
DO NOT
work on an energized circuit breaker.
DO NOT
work on a circuit breaker unless all of the
components are disconnected by means of a visible
break and securely grounded.
DO NOT
work on a circuit breaker with power
supplied to the secondary control circuit.
DO NOT
defeat safety interlocks. This may result in
bodily injury, death and/or equipment damage.
DO NOT
work on a closed circuit breaker.
DO NOT
work on a circuit breaker with charged
energy. capacitors.
DO NOT
use a circuit breaker by itself as the sole
means of isolating a high voltage circuit.
DO NOT
leave a circuit breaker in an intermediate
position in a cell. Always have the circuit breaker in
the Disconnect, Test, or Connect position.
Summary of Contents for VM1/A/P
Page 49: ...MEDIUM VOLTAGE PRODUCTS 49 49 ...
Page 51: ...MEDIUM VOLTAGE PRODUCTS 51 51 ...
Page 53: ...MEDIUM VOLTAGE PRODUCTS 53 53 ...
