Answer Posted / bramananthan

Whenever the unbalanced current flow in the circuit the connected EFR sense that current and giving signal to the UV or shunt coil which is placed in the breaker.At that instant the breaker comes to Trip & break the supply.

What is the function of probe in cro?

1190

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how to calculate the Neutral transformer impedance?

2430

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Why AC current leads voltage in capacitor and how?

2140

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how many current required for hypo test

1964

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Benifits of 3ph 4 wire metering over 3ph 3 wire

2460

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please give me solution to rectify the emi(electromagnetic interference)

1899

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What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer?

2002

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Why there are some equipment(i.e:TV) that using 2-pin plug instead of three? What happen if there is current leakage? Are we going to get electric shock??

2176

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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.

1865

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i want to apper for apgenco or aptransco or related can any one sugest me where can i get previous papers of thouse exams

3297

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for opening electrical shop, tips needed.

1819

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Wt is the function of reactive power? How it generates & consume though resultant is zero?

1879

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How does a tertiary winding filter harmonic(espcially 3rd one) from entering into load system?

1797

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solor panels arrange some angle,panel is flat fitted energy was produced or not why?

1894

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A 3-phase IM is supplied from 50 Hz system. It runs at speed of 1440 rpm and slip equal to 4 %. Calculate number of pole pairs. A 1 B 6 C 2 D 3

2014

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