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

1 Summary

1.1 General

The vacuum circuit-breakers of type VD4 on with-drawable
parts for 36 kV or 40.5 kV rated voltage are intended for
indoor installation in air-insulated switchgear systems. Their
switching capacity is sufficient to handle any conditions arising
from switching of equipment and system components under
normal operating and fault conditions, particularly short-
circuits, within the parameters of their technical data.
Vacuum circuit-breakers have particular adswitching 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 auto-reclosing, and
have exceptionally high operating reliability and long life.
The vacuum circuit-breakers designed in column form, are
supplied as withdrawable modules. Their basic structure is
shown in figures 3/1,3/2,3/7 and 3/8.

1.2 Standards and specifications

1.2.1 Switchgear manufacture

The switchgear complies with the following specifications in
accor dance wi th G B, I EC and the rel evant DIN VDE
publications respectively.
GB/T 11022, IEC 62271-1 and DIN VDE 0670 part 1000,
■
"Common specifications for highvoltage switchgear and
controlgear standards".
GB 1984 and IEC 62271-100, "High-voltage alternating-
■
current circuit-breakers".

1.2.2 Installation and operation

The relevant specifications are to be taken into account during
installation and operation, particularly:
IEC 61936-1, Electrical devices with rated voltage above
■
AC 1 kV
DIN VDE 0101, Power installations exceeding AC 1 kV
■
DIN VDE 0105, operation of electrical installations
■
DIN VDE 0141, earthing systems for special power
■
installations with rated voltages over 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 Standard VBG 1
■
Health and Safety at Work Standard VBG 4
■
Safety guidelines for auxiliary and operating materials
■
Order related details provided by ABB Xiamen Switchgear
■
Co.,Ltd.

1.3 Operating conditions

1.3.1 Normal operating conditions

Design to GB/T 11022, "Common specification for high-voltage
switchgear and controlgear standards", IEC 62217-1, VDE0670
part 1000, with the following limit values:
Ambient temperature:
■
Maximum
■
Highest mean value measured in 24 hours
■
Minimum (according to "minus 5 indoor class")
■
Humidity
■
Highest mean value of relative humidity measured over
■
24 hours
Highest mean value of vapour pressure measured over
■
24 hours
Highest mean value of relative humidity measured over
■
1 month
Highest mean value of vapour pressuremeasured over
■
1 month
Maximum site altitude:
■
1000m 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 in areas:
■
○ with high humidity and/or
○ with major rapid temperature fluctuations.
Implement preventive measures (e.g. electric heaters)
■
to preclude condensation phenomena.
+40℃
+35℃
-15℃
95%
2.2kPa
90%
1.8kPa
VD4 Vacuum Circuit-breaker | Summary 5