Summary; General; Standards And Specifications; Switchgear Manufacture - 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 ad-
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 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 accordance with GB, IEC and
the relevant DIN VDE publications respectively.
GB/T 11022, IEC 60694 and DIN VDE 0670
●
part 100, "Common specifications for high-
voltage 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, 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 publication 60694, VDE 0670
part 100, 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 pressure
measured 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˚C
+35˚C
-15˚C
95%
2.2kPa
90%
1.8kPa
5