Why do we perform an open-circuit test and short-circuit test on the transformer?

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design a LV scheme for a 15 storied building?

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I have tow 200 KVA UPS, both are in parallel mode.My question is that, both are running on battery when power fail, if one of them fail (Eg rectifire fails or some other reason), at thet time reverse power will come to faild ups if it comes then it will harm to failed ups or not? if not then how it protects to faied ups????????????????

1 Answers  

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100V supply is appllied between 500K Resistance bulb. for 1 kwh energy, how long time the bulb will glow? explain the calculating method.

3 Answers   Bhel,

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why is the number of turns different in current and potential coils of wattmeter..?

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How to select busbar?

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in industrial lighting in each circuit how many lamps can be given? and how much load can be put on each circuit? is there standard for this? please help me with the standard description?

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What are the significant parts of dc generator?

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why ct ratio always rated 5.

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how to diffrentiate between ac & dc motors from a distance

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Hi If connecting a temp generator 670KVA .415kv with step up Tx .415/11kv. I am given Generator impedances Z1 Z2 Z0 to 100MVA base. Do I need to work out the generator fault current by using these impedances i.e gen rating / impedance. Then use this as my source impedance for the calculations that follow.

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what is the diffrence between mcb &elcb?

2 Answers   Kahramaa, Synergy,

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