SF6 Gas or Sulfur Hexafluoride Gas Properties

History of SF6 SF6 or sulfur hexafluoride gas molecules are combined by one sulfur and six fluorine atoms. This gas was first realized in the year 1900 in the laboratories of the Faculte de Pharmacie de, in Paris. In the year of 1937, General Electrical Company first realized that SF6 gas could be used as … Read more

Circuit Breaker Maintenance

For maintenance of circuit breaker or circuit breaker maintenance, it must be first switched off and then isolated from both sides by opening concerned electrical isolator. At this no isolated condition the circuit breaker must be operated for local and remote condition yearly and when required. The circuit breaker should be operated electrically from local … Read more

High Voltage Testing | Low Frequency Constant DC High Frequency Surge or Impulse Test

The electrical power demand is rising rapidly. Now days, huge quantity of electrical power is necessary to transmit from one place to other for fulfilling this rising power demand. Bulk power transmission can be most efficiently done through high voltage electrical power transmission system. Hence, high voltage system becomes most essential requirement for power transmission. … Read more

Rating of Circuit Breaker | Short Circuit Breaking Making Current

The rating of a circuit breaker includes, Rated short circuit breaking current. Rated short circuit making current. Rated operating sequence of circuit breaker. Rated short time current. Short Circuit Breaking Current of Circuit Breaker This is the maximum short circuit current which a circuit breaker can withstand before it, finally cleared by opening its contacts. … Read more

Routine Tests of Circuit Breakers

Various routine tests are performed for ensuring the quality, performance of a circuit breaker and these are Power frequency over voltage withstand test Dielectric test on auxiliary circuit and control circuit Measurement of resistance of main circuit or contact resistance test Tightness test or SF6 gas leakage test Design and visual checks Mechanical operation tests. … Read more

Remote Controlling of Circuit Breaker by Microcontroller

We often come across a situation where we want to switch on the electrical load by pressing some buttons on computer program. Consider an example, where you are sitting in a power plant and you want to switch on a circuit breaker. Controlling circuit breaker from remote is mainly done by using Microcontroller. Let us … Read more

Residual Current Circuit Breaker

RCCB (Residual Current Circuit Breaker) falls under the category of wide range of circuit breakers. As we know there are several types of miniature circuit breakers like MCCB which works on different operational principle and has different safety purposes. Function: Residual Current Circuit Breaker is essentially a device which senses current and disconnects any low … Read more

Dielectric Gases

Dielectric materials are basically basic and pure electrical insulators. By applying a sensible electrical field, the dielectric gases can be polarised. Vacuum, Solids, Liquids and Gases can be a dielectric material. A dielectric gas is also called as an insulating gas. It is a dielectric material in gaseous state which can prevent electrical discharge. Dry … Read more

Circuit Breaker Operation

The primary function of an electrical circuit breaker is to provide opening and closing of the current carrying contacts. Although it is seems to be very simple. But we should remember, that, one circuit breaker remains at its closed position for maximum period of its life span. Very occasionally it is required to operate a … Read more

Short Circuit Current of Circuit Breaker

When there is a short circuit fault in the electrical system, huge short circuit current flows through the system including the circuit breaker contacts unless the fault is cleared by tripping the CB. When the short circuit current flows through the CB, the different current carrying parts of the circuit breaker are subjected to huge … Read more