Summary; General; Standards And Specifications; Apparatus Manufacture - ABB VD4X Instruction Manual

S U M M A R Y
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Summary

1.1 General

(Figures 2/1a and 2/1b)
The vacuum circuit-breakers of type VD4X are
intended for installation in switchgear with
gas-tight encapsulation. The vacuum circuit-
breaker performs not only the usual functions
of making, breaking and short-circuit breaking,
but also performs the earthing function in
conjunction with a three-position switch. The
vacuum circuit-breaker is in stalled on a mounting
plate, and thus facilitates for instance gas-tight
installation in a gas-insulated panel.

1.2 Standards and specifications

1.2.1 Apparatus manufacture

The switchgear complies with the following
speci fications in accordance with the relevant
IEC and GB publications:
• IEC 62271-1, High-voltage switchgear and
controlgear Part 1: Common specifications for
alternating current switchgear and controlgear
• IEC 62271-100, High-voltage switchgear and
controlgear Part 100: Alternating current
circuit-breakers
• GB/T 11022-2011, Common specifications for
high-voltage switchgear and controlgear
standards
• GB/T 1984-2014, High-voltage alternating-
current circuitbreakers
1.2.2 Installation and operation
The relevant specifications are to be taken into
account during installation and operation,
particularly:
• DIN VDE 0101 respectively IEC 61936-1, Power
installations exceeding AC 1 kV
• VDE 0105 respectively DIN EN 50110, Operation
of electrical installations
• DIN VDE 0141 respectively DIN EN 14387,
Earthing systems for special power
installations with rated voltages above 1 kV
• Accident prevention regulations issued by the
appropriate professional bodies or comparable
organizations
• Safety guidelines for auxiliary and operating
materials
• Order related details provided by the switchgear
manufacturer
1.3 Operating conditions
1.3.1 Normal operating conditions
Design to IEC 62271-1, High-voltage switchgear
and controlgear, Part 1: Common specifications
for alternating current switchgear and controlgear,
with the following 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 water vapour pressure,
over a period of one month, does not
exceed
• Ambient air
- The ambient air is not to be significantly
contaminated by dust, smoke, corrosive or
flammable gases, vapours or salt
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:
• Increased ambient temperature
- Current carrying capacity is reduced
- Provide additional ventilation for heat
dissipation
• In areas with high humidity or major rapid
temperature fluctuations, prevent condensation
inside the low voltage compartment (e.g. by
installing electric heaters in that compartment)
5
+ 40 °C
+ 35 °C
– 15 °C
95 %
2.2 kPa
90 %
1.8 kPa