Switchgear & Protection
Sulfur Hexafluoride Gas (SF6) Properties Heavy, chemically inert, non toxic No poisonous effect on the human body but decomposition products are poisonous Color…
Oil circuit breakers are the oldest type of circuit breakers. The separating contacts of the oil circuit breakers are made…
AC type protective relays are actuated by the current and voltage supplied by the current and potential (voltage) transformers which…
In Electromagnetic relays operating current flows through the coil. When this operating current increases, coil energizes the electromagnet. When the…
Step Potential Step potential is the step voltage between the feet of a person standing near an energized grounded object.…
Step Potential and Touch Potentials are very important in substations because during ground faults all the ground current returns to…
Majority of electrical substations will be air insulated type. All the electrical equipment live parts will be exposed .All the…
In air blast circuit breakers, compressed air at a pressure of 20-30 kg/cm2 is employed as an arc quenching medium. Air…
Creepage Distance for Insulators: The creepage distance for insulators is the shortest distance along the insulator surface between the metal…
