Answer / alianwar

In electrical engineering, ground or earth may be the
reference point in an electrical circuit from which other
voltages are measured, or a common return path for electric
current, or a direct physical connection to the Earth.
Electrical circuits may be connected to ground (earth) for
several reasons. In mains powered equipment, exposed metal
parts are connected to ground to prevent contact with a
dangerous voltage if electrical insulation fails. A
connection to ground limits the voltage built up between
power circuits and the earth, protecting circuit insulation
from damage due to excessive voltage. Connections to ground
limits the build-up of static electricity when handling
flammable products or when repairing electronic devices. In
some telegraph and power transmission circuits, the earth
itself can be used as one conductor of the circuit, saving
the cost of installing a separate return conductor.

For measurement purposes, the Earth serves as a
(reasonably) constant potential reference against which
other potentials can be measured. An electrical ground
system should have an appropriate current-carrying
capability in order to serve as an adequate zero-voltage
reference level. In electronic circuit theory, a "ground"
is usually idealized as an infinite source or sink for
charge, which can absorb an unlimited amount of current
without changing its potential. Where a ground connection
has a significant resistance, the approximation of zero
potential is no longer valid. Stray voltages or earth
potential rise effects will occur, which may create noise
in signals or if large enough will produce an electric
shock hazard.

The use of the term ground (or earth) is so common in
electrical and electronics applications that circuits in
vehicles such as ships, aircraft, and spacecraft may be
spoken of as having a "ground" connection without any
actual connection to the Earth.

Answer / shivkumar

Grouding is same as earthing. The metal body is coneected
to earth.due to grounding the leakage current flows through
to ground.

Is there any type of starter for DC motor other than two point,Three point and Four point starters?

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As we know multiplicity factor derivation equation is as below MF = main c t ratio / main p t ratio * meter c t ratio / meter p t ratio * meter dial constant Where in digital meters for HT kwh import export now a days meter constant are calibrated already which is 1 So my question is For HT 11kv 110 v line values are as below Main c t and p t ratio are 11000 v and 110 v and 20/5 means 20 amp and 5 amp Now meter values are 11000/√3/110√3 and primary and secondary amp are displayed as -/5 amp on kwh meter so what will be the MF for this meter ?

1 Answers   NEPC,

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Why cpaciter opposes sudden changes in voltage?and how?

1 Answers  

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A ceiling fan moves Counter clockwise & a pedestal fan clockwise.....y the difference????

5 Answers   Alstom, NTPC,

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There are different classes of protections in power plants.class a,b,c are clear..is there any class d and e r there..and elaborate class b protection.

0 Answers   GMR,

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how much LT load can bear by the 100 KW HT connection.

0 Answers  

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How to write a progrramme to turn ON and turn OFF a motor with a single push button in AB?

2 Answers   HCL, Torrent Pharma,

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my 10 hp submersible pump is tripping when connected through ELCB.I have checked the megger value of the coil's with body.It was found to be 0.2mega ohm.that is leakage is there.But when connected to mccb it is not tripping.no leakage current in the motor.Is it safe to connect to mccb? what are the problem's will arise if future?also tell me in ELCB no neutral is connected to motor.than how ELCB was working?

1 Answers  

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What is the meaning of Insulation H for transformers????

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How to calculate Voltage regulation of 22 KV Over head Line.

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what happen if any one phase of a slipring induction rotor winding is open?is it start or won't?

2 Answers   Aurobindo, Hetero,

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Why is the neutral point of a star connected winding of a motor not grounded?

1 Answers  

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