Answer Posted / pragya

electronics appliances operate below 25 volt.

electrical appliances operate above 25 volt.

My question is whether bellow formula is correct to find bus size for 46kA for 0.5 second & what is RT in bellow formula. formula to calculate the size of busbar to withstand the thermal stresses due to currents with duration of 0.2 sec to 5 sec. Sp = RT( I x I x t) / K Where Sp – is the cross sectional area of bus bar in millimeters. I -    is the value of AC fault current. t -    is the operating time of disconnecting device in seconds. K –  is the factor depending on the material of the conductor, insulation and initial and final temperature. Value of ‘k’ for copper is 143.

1815

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how choose conductor&depending upon load

1835

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what types of electrical & mechanical test conducted in switchyard?

2145

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what is the function of capacitor duty contactor in an capacitor panel???

4093

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1818

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who invented active elements? plz give me the complte details of active elements...

1793

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If a transformer primary winding operates at 240v, the secondary at 120v and the load is 1500w & the transformer is rated at 92% efficient, what's the current flowing through the primary winding of the transformer? What is the formula for finding this?

2144

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1966

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4576

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2476

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1744

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1058

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1105

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2058

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3405

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