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by:Zed Control System, Moradabad
Product Description
Why SF6?
Sulfur Hexafluoride (SF6) is an excellent gaseous dielectric for high voltage power applications. It has been used extensively in high voltage circuit breakers and other switchgears employed by the power industry. Applications for SF6 include gas insulated transmission lines and gas insulated power distributions. The combined electrical, physical, chemical and thermal properties offer many advantages when used in power switchgears. Some of the outstanding properties of SF6 making it desirable to use in power applications are:-
General Information
SF6 circuit breaker is equipped with separated poles each having its own gas. In all types of the circuit breakers, gas pressure is 2 bars (absolute 3 bars). Even if the pressure drops to I bar, there will not be any change in the breaking properties of the circuit breaker due to the superior features of SF6 and Elimsan's high safety factor for the poles. During arcing, the circuit breaker maintains a relatively low pressure (max 5-6 bars) inside the chamber and there will be no danger of explosion and spilling of the gas around. Any leakage from the chamber will not create a problem since SF6 can undergo considerable decomposition, in which some of toxic products may stay inside the chamber in the form of white dust. If the poles are dismantled for maintenance, it needs special attention during removal of the parts of the pole. This type of maintenance should be carried out only by the experts of the manufacturer.
The SF6 gas circuit breakers are available for medium voltage (3.6 kV onwards) to EHV systems. While the Vacuum circuit breakers have gained a strong footing in Medium voltage up to 36 kV ,SF6 gas circuit breakers are used from 36 kV onwards up to 400kV.
Product Description
As an option, the Siemens Type CPV2 Circuit Switcher can be equipped with a temperature compensated pressure switch to automatically monitor the status of the SF6 gas in the pole units. This switch with gauge is located inside the control cabinet, and has two sets of contacts. One set of contacts provides an alarm indication when the gas pressure approaches within 5 psi of the lockout value.
Company Information
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by:Zed Control System, Moradabad