Outdoor SF6 Gas Circuit Breaker

Outdoor Live Tank SF6 Gas Circuit Breaker

RHB-40.5 type medium voltage live tank sf6 gas circuit-breakers for outdoor installation use sulphur hexafluoride gas (SF6) to extinguish the electric arc and as the insulating medium.

Breaking in SF6 gas takes place without current chopping or generation of overvoltages.

These characteristics guarantee a long electrical life for the circuit-breaker and limited dynamic, di-electric and thermal stresses on the installation.

The GSH (MH)  type of stored energy and free release mechanical operating mechanism allows opening and closing operations through local and remote control.

The operating mechanism, the activating kinematics of the moving contacts and the anti-condensation heater are located inside a tight metal enclosure which also acts as the support for the poles.

The above-mentioned structure is supported by a frame made of telescopic metal sections which allow the height of the circuit-breaker terminal to be adapted from 2800 mm to 3700 mm.

The metal enclosure has IP 54(*) degree of protection and is fitted with a tight door with an inspection window.

The circuit-breaker is compact and ensures a high level of sturdiness and excellent mechanical reliability.

The enclosure is made out of a steel plate with adequate surface protection by a special metalising and painting process. The support structures are hot dip galvanised.

Fields of application of RHB-40.5 type medium voltage live tank sf6 gas circuit-breakers

RHB-40.5 type medium voltage live tank sf6 gas circuit-breakers are used in power distribution for control and protection of lines and for control and protection of transformers, rectifier units, capacitor banks, etc.
Due to the SF6 autopuffer breaking technique, the RHB-40.5 circuit-breakers do not generate overvoltage during switching, and are therefore also highly suitable for retrofitting, upgrading and enlarging older installations where the insulating materials of the cables and apparatus may have already been stressed during service.

Service environment of RHB-40.5 type medium voltage live tank sf6 gas circuit-breakers

1. Altitude: no more than 2500 meters; high prototype 4000 meters;
2. Ambient temperature: -30 ℃ — + 40 ℃ (special requirements -40 ℃ — + 40 ℃);
3. Relative humidity: daily average is not greater than 95%, monthly average is not greater than 90% (25 ° C);
4. Wind speed: no more than 35 meters / second;
5. Where there is no flammable substance, explosion hazard, chemical corrosion and severe vibration.