Indoor SF6 Circuit Breaker

General

HR4 type high voltage indoor SF6 gas circuit breaker with two installation way by drawable/Fixed. which is widely application for three-phase AC power system of rated voltage from 3.3kV up to 36kV at frequency 50/60Hz, especially using for power plant, transformer substation, petrol chemical industry, metallurgy, manufacturing industry, airport, residential area, etc..

Its high performance switchgear which will reduce over-voltage and harmonic impulse at max for by a normal or fault breaking or making.

Its easy for interchange for VD4,SF1,HD4 type switchgear like type KYN28 or AMS, ABB type ZS1 series, etc.

This circuit breaker is follow per standards like:

IEC62271-100AC high voltage circuit breaker,

GB1984-2003 AC high voltage circuit breaker

JB3855 3.6-40.5Kv indoor AC High voltage circuit breaker

DL/T403 Specification of 12-40.5kV indoor High voltage vacuum circuit breaker.

 

Offering

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

Fixed and withdrawable version

Stored energy operating mechanism with anti-pumping device as standard common

to the whole circuit-breaker series

Mechanical safety locks against incorrect operations

Simple personalisation thanks to a com- plete range of accessories

Maintenance-free

SF6 gas pressure control device (on request).

 

Fields of application

HM4 circuit-breakers are used in power distribution to control and protect lines, transformer and distribution substations, motors, transformers, capacitor banks, etc.

Thanks to the SF6 autopuffer breaking technique,the HM4 circuit-breakers do not generate operating overvoltages, and are therefore also highly suitable for retrofitting, upgrading and enlarging older installations where the motor, cable, etc. insulating materials may be particularly sensitive to dielectric stresses.

 

Breaking technique

The breaking technique of HD4 circuit-breakers is based on compression and self-blast techniques to obtain top performances at all service current values, with minimum arc times, gradual arc extinction without chopping, and no restriking or operating overvoltages.

The HM4 series brings to medium voltage the advantages of the “autopuffer” breaking technique already used in high voltage.

 

Standards and approvals

HM4 circuit-breakers comply with IEC 62271-100, CEI 17-1 file 1375 Standards and with those of major industrialised countries.

They have undergone the following tests and guarantee safety and reliability of the apparatus in service in all   installations.

Type tests: heating, withstand insulation at industrial and impulse frequency, short-time and peak withstand current, mechanical duration, making and breaking of short-circuit currents;

Individual tests: insulation with voltage at industrial frequency in the main circuits and insulation of the auxiliary and control circuits, measurement of the main circuit resistance, mechanical and electrical operation.

The HM4 circuit-breakers are tested according to the requirements of the IEC 62271-100 Standard (class E2 - table 21) and guarantee suitability for use in overhead lines, with rapid reclosing cycle.

 

Service safety

Thanks to the availability of a complete range of mechanical and electrical locks (on request), safe distribution switchgear can be constructed using HM4 circuit-breakers. The locking devices have been designed to prevent incorrect operations and to carry out inspection of the installation, ensuring maxi- mum operator safety.

Technical Service:

ROCKWILL®, China. Provide with best support

Tel: 0086-577-27869969

Email: barry@rockwill.cn