Sulfur Hexafluoride Gas (SF6) Properties
April 28, 2016
Sulfur Hexafluoride Gas (SF6) Properties Heavy, chemically inert, non toxic No poisonous effect on the human body but decomposition products are poisonous Color...
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Advantages & Disadvantages of Oil Circuit Breakers
April 24, 2016
Oil circuit breakers are the oldest type of circuit breakers. The separating contacts of the oil circuit breakers are made...
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Functions of Instrument Transformers (CTs and PTs)
April 24, 2016
AC type protective relays are actuated by the current and voltage supplied by the current and potential (voltage) transformers which...
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Advantages & Disadvantages Electromagnetic Relays
April 24, 2016
In Electromagnetic relays operating current flows through the coil. When this operating current increases, coil energizes the electromagnet. When the...
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What Is Step and Touch Potential and Reducing Resistance To Ground?
April 24, 2016
Step Potential Step potential is the step voltage between the feet of a person standing near an energized grounded object....
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Methods to Reduce Step Potential and Touch Potential in Substation
April 24, 2016
Step Potential and Touch Potentials are very important in substations because during ground faults all the ground current returns to...
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Substation Safety Clearances
April 24, 2016
Majority of electrical substations will be air insulated type. All the electrical equipment live parts will be exposed .All the...
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Advantages and Disadvantages of Air Blast Circuit Breakers
April 24, 2016
In air blast circuit breakers, compressed air at a pressure of 20-30 kg/cm2 is employed as an arc quenching medium. Air...
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Creepage Distance for Insulators in Substation
December 7, 2015
Creepage Distance for Insulators: The creepage distance for insulators is the shortest distance along the insulator surface between the metal...
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