Answer / md. faruque

A combination of disconnect switches and breakers used to isolate equipment in substations. It refers to electrical equipment that regulates the flow of electricity within an electrical system. It is used by utility providers and private facilities alike for two reasons: to prevent overloads and short circuits, and to de-energize circuits for testing and maintenance. The most familiar types of switchgear are circuit breakers , fuses & lighting arrestors, which interrupt the flow of electricity to a circuit when its current becomes too high and directly pass the surge voltage to earth.
Main considerations in apparatus protection – transformer, generator and motor protection – protection of busbars. Transmission line protection – zones of protection.CTs and PTs and their applications in protection schemes.
Types of circuit breakers – air blast, air break, oil, SF6 and vacuum circuit breakers. Types of lighting arrestors are- horn gap, expulsion type, gapless metal oxide type etc. It is also classified on the basis of class.

Answer / k.prakashchandra

Switch gears include c.b.and isolators

Answer / younas

what is the important think in switchgear room

What is the need of motor starter?

6 Answers  

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star delta starter contorl circuit... drawing..

0 Answers  

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why ct is testing using dc.. y cant we use AC insted of dc on POLARITY TEST.

6 Answers  

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what is kVA

6 Answers   TATA, Tata Motors,

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Difference between UPS and Inverter?

7 Answers   HCL,

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What different between kw and kva. why maser AC in kva.

3 Answers  

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what is the CT & PT. where is it uses.what is the using that plese kindly answer me...?

4 Answers   Cap Gemini, JLL,

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What is the purpose of Rotor earth fault relay and How to test the Rotor earth fault relay in generators and What is the procedure?.

1 Answers  

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I am getting above 60 V as open delta voltage against single phase unit ICT at tertiary delta formed and ICT getting trippped on NDR. ICT tested and found in order. PTs provided on tertiary are tested and in order. what may be the reason?

0 Answers  

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How many battery required for an 3kva online ups with 3 hrs back up with usage of 3 fans,3tube lights

1 Answers  

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1.differance between onload ups and off line ups.

1 Answers   CTS,

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Why Water motor is not taking a load or pressure while everything is correct. (Note: Motor running properly)

0 Answers  

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