文档介绍：Medium Voltage Products
HD4
Gas insulated MV circuit-breakers
12 ... kV - 630 ... 3600 A - 16 ... 50 kA
1
DESCRIPTION 2
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CIRCUIT-BREAKER SELECTION AND ORDERING 6
3
CIRCUIT-BREAKERS FOR FIXED PARTS AND 29
ENCLOSURES
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SPECIFIC PRODUCT CHARACTERISTICS 31
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OVERALL DIMENSIONS 34
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ELECTRICAL CIRCUIT DIAGRAM 54
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1 DESCRIPTION
Autopuffer breaking technique
Electric arc extinction without chopped
current
No restriking after breaking
Rapid recovery of the dielectric properties
of the means of extinction
Withstand insulation voltage even at zero
relative pressure (*)
Breaking up to 30% of the rated breaking
capacity even at zero relative pressure (*)
Sealed-for-life poles
Test for checking gas tightness carried out
three times on each piece of apparatus
Compact dimensions
General information Fixed and withdrawable version
HD4 medium voltage circuit-breakers use sulphur
hexafluoride gas (SF6) to extinguish the electric arc Stored energy operating mechanism with
and as the insulating medium. anti-pumping device as mon
Breaking in SF6 gas takes place without any arc
chopping and without generation of overvoltages. to the whole circuit-breaker series
These characteristics ensure long electrical life of
Mechanical safety locks against incorrect
the circuit-breaker and limited dynamic, dielectric
and thermal stresses on the installation. operations
The circuit-breaker poles, which make up the
Simple personalisation thanks to -
breaking part, are systems with lifelong sealed
pressure (IEC 62271-100 and CEI 17-1 Stand- plete range of accessories
ards) and are maintenance-free. Maintenance-free
The ESH type mechanical operating mechanism,
with stored energy has free release and allows SF6 gas pressure control device (on
opening and closing operations independently of request).
the operator’s actions.
The operating mechanism and the poles are fixed
to the metal structure which also ac