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

1

Summary

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 switch-
ing on and off of equipment and switchgear com ponents
under normal and fault conditions.
Vacuum circuit-breakers have particular advan t ages 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 free-
dom from maintenance.
The vacuum circuit-breakers of type VM1 in column design
can be supplied both on withdrawable parts and 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
installation and operation, particularly:
- DIN VDE 0101, Power installations exceeding AC 1 kV
- DIN VDE 0100-410, Erection of power installations up to
1000 V, protective measures
- VDE 0105, Operation of electrical installations
- DIN VDE 0141, Earthing systems for special power installa-
tions 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.
6 VM1 Vacuum circuit-breaker | Instruction manual 504/05
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:
- Current carrying capacity is reduced.
- Provide additional ventilation for heat 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.
+40°C
+35°C
–25°C
95%
2.2 kPa
90%
1.8 kPa