Answer Posted / dr rajan

There is no formula. It is always a thumb rule. The dielectric
break down of air is about 6kv/cm of gap. So depending on the
terminal voltage, use a rational distance keeping in mind the
connecting terminal dimensions of the cable. An average of 15
cm space between phases in 11Kv accepted as a practice.

Is it possible to measure correct value of earth resistance & cable insulation ristance with out disconncting earth lead & both sides of cable ends? If not, any other method to measure ER & CIR with out disconneting from the system.

2108

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if in 3-phase system voltage=440V,frequency=60Hz, current=400A. then if it is single phase then current=? and if it is single phasing then current=?

2566

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What are the types of instrument transformer?

1180

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In a power conditoining unit (inverter) of a solar plant when we measure the d.c. current fed by different strings of solar plates to inverter, the current in the negative wire is less almost by 1 ampere to the current in its positive wire say current in positive wire 5 A , then current in negative wire of the same string is 4 A. Since the current entering should be equal to current leaving then why the current is noticably less in negative wire.

1613

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What is mean 2XWY

2500

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Explain mechanical rotational system?

1137

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why output is out of phase in case of common emitter?

2151

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how to compute kvar in substation feeder to improve power factor and sending voltage

2153

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What is center gravity load in substation?

2428

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What is the abbreviation of NGT panel

2048

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How to test REF relay testing for LV panel as per Kahramaa standard?

4953

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CPC cable .PVC \1C....I want to get sure that type is flexible indoor or to be install on trench. please advice .thanx :)

1850

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What is a differential amplifier?

1263

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Explain the working of variable frequency transformer?

1160

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Why we cant store an ac power. If we coo store in which device we can?

2183

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