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February 11, 2012

What is different between resistance grounding system and resistance earthing system?

Resistance grounding system means connecting the neutral point of the load to the ground to carry the residual current in case of unbalanced conditions through the neutral to the ground whereas resistance earthing system is done in an electric equipment in order to protect he equipment in occurence of fault in the system.

February 8, 2012

When we connect the large capacitor bank in series ?

We connect large capacitor bank in series to improve the voltage power supply at the load end in balanced transmission line when there is considerable voltage drop along the balanced transmission line due to high impedance of the line.So in order to bring the voltage at the load terminals within its limits (i.e (+ or - %6 )of the rated high terminal voltage )the large capacitor bank is used in series.

February 7, 2012

What is the usual apparatus in a substation?

A substation usually contains the following major apparatus:

1. Transformers
2. Circuit breakers
3. Horn-gap switches
4. Disconnect switches

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