文档介绍：HD4/R
MV gas circuit-breakers for secondary distribution
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DESCRIPTION 3
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CIRCUIT-BREAKER SELECTION AND ORDERING 9
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SPECIFIC PRODUCT CHARACTERISTICS 23
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OVERALL DIMENSIONS 43
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ELECTRIC CIRCUIT DIAGRAM 47
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DESCRIPTION
General information 4
Versions available 4
Application range 4
Protection relay 5
Standards and approvals 6
Service safety 6
Accessories 6
ESH operating mechanism 6
Technical documentation 8
Electrical characteristics 8
Quality Assurance System 8
Environmental Management System 8
Test laboratory 8
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DESCRIPTION
General information
HD4/R medium voltage circuit-breakers for indoor
installation use sulphur hexafluoride gas (SF6) to
extinguish the electric arc and as the insulating
medium between the main fixed and moving
contacts. They are constructed using the separate
pole technique.
The operating mechanism is the ESH type with
stored energy and trip free with opening and
closing operations independent of the operator.
Remote control of the circuit-breaker is possible by
means of applying special electrical accessories
(geared motor, shunt opening release, etc.).
The operating mechanism, the three poles and any
accessories are mounted on a metallic frame
without wheels. Construction is -
pact, sturdy and of limited weight.
The circuit-breakers in the HD4/R series are
maintenance-free “sealed for life” pressure sys-
tems (IEC 62271-100 and CEI 71-1 Standards).
Versions available
HD4/R circuit-breakers are available in the fixed
version with right lateral operating mechanism.
The circuit-breakers with rated voltage up to 24 kV
can be fitted with current sensors and with PR521
microprocessor-based overcurrent release.
. In the 24 kV versions with 230 mm pole centre
distance, only two current sensors can be mounted (on
the lateral poles).
Application range
The circuit-breakers in the HD4/R series are used
in all applications for medium voltage seco