Description - ABB VD4 Addendum Manual

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Description

General
The VD4-36kV cradle retrofit solution circuit
breakers are pieces of apparatus with vacuum
technology for indoor installation. For the
electrical performances, please refer to the
corresponding technical catalogue code
1VCP000307.
For special installation requirements, please
contact ABB.
The following versions are available:
- Withdrawable CB for VHA 36 switchgear.
Ratings:
36kV 1250A 31.5kA
36kV 2000A 31.5kA
Reference standards
The VD4-36kV cradle retrofit solutions confirms
to the IEC 62271-100 standards.
EL operating mechanism
The VD4-36kV cradle retrofit solution circuit
breakers are equipped with modular EL3 type
spring operating mechanisms for short- circuit
current upto 31.5kA.
Withdrawable version
The VD4-36kV cradle retrofit solution circuit
breakers are equipped with common truck
assembly which makes it possible to make the
circuit breakers withdrawable version.
The VD4-36kV cradle retrofit solution is
specifically used for retrofitting SF6 gas circuit
breakers HPA36 in ABB make VHA36 panels.
The circuit breaker is having three pole
assemblies which are firmly mounted on steel
sheet frame. The contact arms along with the
tulip contacts are mounted on fixed pole
terminals. The steel frame assembly is fixed on
the common truck which is used to move the
circuit breaker from TEST to SERVICE position &
vice versa on guide rails provided on panel side.
The CB is delivered with control cable with
58 core cables and plug in 64 pin contacts for the
control circuit.
Earthed contact which is fitted on the left side of
truck frame automatically connects to fixed earth
slide provided on metal guide rails when CB is
inserted in guide rails.
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Fig 9.1
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Fig 9.2
1. Common truck
2. CB frame
3. Front wheel of common truck
4. LHS & RHS shutter lifting bracket
5. CB pole assembly
6. Top contact arm assembly
7. Bottom contact arm assembly
8. Top tulip assembly
9. Bottom tulip assembly
10. Cable stem
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7
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9
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