General; Standards And Specifications; Switchgear Manufacture; Installation And Operation - ABB VD4 Product Manual

Summary
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1.1

General

(Figures 2/1 to 2/8)
The vacuum circuit-breakers of type VD4 are
intended for indoor installation in air-insulated
switchgear systems. They have a switching
capacity capable of handling the loads occuring
at start-up and shutdown of equipment and plant
units both in normal and in fault state.
Vacuum circuit-breakers have particular advan-
tages for use in networks where there is a high
switching frequency in the working current range
and/or where a certain number of short-circuit
breaking operations are expected. Type VD4
vacuum circuit-breakers are suitable for autore-
closing, and have exceptionally high operating
reliability and long life.
The vacuum circuit-breakers of type VD4,
designed in column form, can be supplied both
as individual units for fixed installation and
mounted on chassis. Their basic structure is
shown in figures 2/1 to 2/8.
1.2

Standards and specifications

1.2.1 Switchgear manufacture

The switchgear complies with the following
specifications 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
• VDE 0105, Operation of electrial 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.
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 5 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
dissipation.
• Climate:
– Avoid the risk of corrosion or other damage 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
–5 °C
95%
2,2 kPa
90%
1,8 kPa
ventilation for heat
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