ABB VD4X, Instruction Manual

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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                                                     + 40 °C

-  Maximum 24 hour average                     + 35 °C

-  Minimum (according to

“minus 5 indoor class”)                            – 15 °C

•  Humidity

-  the average value of the relative humidity 

measured over a period of 24 h, does not 
exceed                                                              95 %

-  the average value of the water vapour 

pressure, over a period of 24 h, does not 
exceed                                                          2.2 kPa

-  the average value of the relative humidity, 

over a period of one month, does not 

exceed                                                              90 %

-  the average value of water vapour pressure, 

over a period of one month, does not 

exceed                                                          1.8 kPa

•  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)

S U M M A R Y

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