General; Standards And Specifications; Switchgear Manufacture; Installation And Operation - ABB VM1 Instruction Manual

Summary
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1.1

General

The vacuum circuit-breakers of type VM1 are inten-
ded for indoor installation in air-insulated switch-
gear. Within the limits of their technical data, they
have a switching capacity which is sufficient to
withstand the loads occurring during the switching
on and off of equipment and switchgear com-
ponents under normal and fault conditions.
Vacuum circuit-breakers have particular advantages
for use in systems where the switching frequency in
the operating current range is high, and/or where a
certain number of short-circuit breaking operations
have to be reckoned with. Vacuum circuit-breakers
of type VM1 are prepared for auto-reclosing opera-
tions and are notable for their especially high
operational reliability and extremely long service life
with complete freedom from maintenance.
The vacuum circuit-breakers of type VM1 in column
design can be supplied both as individual units for
stationary mounting and mounted on trucks. Their
basic structure is shown in section "Technical
data".
1.2

Standards and specifications

1.2.1 Switchgear manufacture

The switchgear complies with the following speci-
fications in accordance with DIN VDE and the
relevant IEC publications:
• VDE 0670, part 1000 and IEC 60694
• VDE 0671, part 100, and IEC 62271-100.

1.2.2 Installation and operation

The relevant specifications are to be taken into
account during
particularly:
• DIN VDE 0101, Power installations exceeding
AC 1 kV
• DIN VDE 0100-410,
installations up to 1000 V, protective measures
• VDE 0105, Operation of electrical installations
• DIN VDE 0141, Earthing systems for special
power installations with rated voltages above 1 kV
• Accident prevention regulations issued by the
appropriate professional bodies or comparable
organisations.
In Germany, these comprise the following safety
regulations:
– Health and Safety at Work Standards BGV A1
and BGV A3
• Safety guidelines for auxiliary and operating
materials
• Order related details provided by ABB.
installation and operation,
Erection of
1.3

Operating conditions

1.3.1 Normal operating conditions

Design to VDE 0670, part 1000, "Common
specifications for high-voltage switchgear and
controlgear standards" and IEC publication 60694,
with the following limit values:
• Ambient temperature:
– Maximum
– Maximum 24 hour average
– Minimum (according to
„minus 25 indoor class")
• Humidity
– the average value of the relative
humidity, measured over a
period of 24 h, does not exceed
– the average value of the water
vapour pressure, over a period
of 24 h, does not exceed
– the average value of the relative
humidity, over a period of
one month, does not exceed
– the average value of the water
vapour pressure, over a period
of one month, does not exceed
• Maximum site altitude:
≤ 1000 m above sea level.

1.3.2 Special operating conditions

Special operating conditions are to be agreed on
by the manufacturer and user. The manufacturer
must be consulted in advance about each special
operating condition:
• Site altitude over 1000 m:
– Allow for the reduction in the dielectric
strength of the air.
• Increased ambient temperature:
power
– Current carrying capacity is reduced.
– Provide
dissipation.
• Climate:
– Avoid the risk of corrosion or other damage,
e.g. to the operating mechanisms, in areas:
• with high humidity and/or
• with major rapid temperature fluctuations.
– Implement preventive measures (e.g. electric
heaters) to preclude condensation pheno-
mena.
additional ventilation
+ 40°C
+ 35°C
– 25°C
95%
2.2 kPa
90%
1.8 kPa
for heat
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