33 kV Indoor Fixed Type SF6 Gas Insulated Circuit Breaker

Summary

Power Tech Electric strives to bring our customers the latest technology and competitive pricing and best HM4 medium voltage circuit-breakers use sulphur hexafluoride gas (SF6) to extinguish the electric arc and as the insulating medium. Breaking in SF6 gas takes place without any arc chopping and without generation of overvoltages. These characteristics ensure long electrical life of the circuit-breaker and limited dynamic, dielectric and thermal stresses on the installation.
The circuit-breaker poles, which make up the breaking part, are systems with lifelong sealed pressure (IEC 62271- 100 and CEI 17-1 Stand- ards) and are maintenance-free.
The REH type mechanical operating mechanism, with stored energy has free release and allows opening and closing operations independently of the operator's actions.
The operating mechanism and the poles are fixed to the metal structure which also acts as a support for the kinetics for operating the moving contacts. Circuit-breakers in the withdrawable version are fitted with a truck to allow racking in and racking out of the switchgear or enclosure.
The light and compact structure of the circuit-breaker ensures great sturdiness and excellent mechanical reliability.
The RCW series automatic circuit reclosers integrates the functions of control, protection, measurement,communication, fault detection, on-line monitoring of closing or opening.

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.


Technical data
 
Outline drawing