Answer / ranjit kumar mirdha

when between two conductor, the surrounding
medium is ionised and chage are deposite on
the conductor, during this process glow light
with hissing sound. Or when phase voltage is
more than the critical disruptive voltage, at
thats time will corone occure...i.e called
corona..

Answer / nipan kumar panda

It is the addition of violet glow,hissing noise and
production of ozone gas is an overhead transmission line is
known as corona.

Answer / sunit chattoraj

A corona is a type of plasma "atmosphere" of the Sun or
other celestial body, extending millions of kilometers into
space, most easily seen during a total solar eclipse, but
also observable in a coronagraph. The Latin root of the
word corona means crown.

Answer / mahantesh kanthi

CORONA EFFECT OCCURS IN O.H CONDUCTOR, WHEN APPLIED 30 KV /
CM, STARTS MAGNETIC FIELD AROUND IT WHICH ENERGISE THE
VELENCY ELECTRONS AROUND IT, ENERGISED ELECTRON GOT
VELOCITY STRIKES THE NEUTRAL ATOMS, CHARGES ITS FREE
ELECTRONS & THE PROCESS GOES ON THEN STARTS INERACTION WITH
THE PARALLEL CONDUCTOR'S SAME PROCESS, MORE CORONA EFFECT
OCCURS WHEN APPLIED VOLTAGE INCREASED MORE THAN 30 KV / CM,
THE EFFECT WILL BE EVEN MORE, WHERE THE CONDUCTOR DURTY &
COVERED WITH DUST, ALSO OCCURS AT ROUGH SURFACE OF THE
CONDUCTOR, LOOKS IN VIOLET COLOUR THAT TO IN NIGHT,HISSING
SOUND OF CORONA CAN BE HEAR BY DISTANCE.

Answer / k.c. bankar

When a high voltage transmitted in a
transmission line, due to magnetic effect on the core of
the conductor all most all electrons passes on the surface
of the conductor.And When dielectric voltage becomes more
than 30v\cm . So the air outside the conductor surface
becames conducive and looks bluish and due to dielectric
breakdown of air a hissing noise comes from surrounding,
Called as corona !

Due to corona OZONE formation on the outside surface of the
conductor. The effect of this to the power system is called
as corona effect.

Answer / pritam halder

When an extra high voltage transmitted in a
transmission line, due to magnetic effect on the core of
the conductor all most all electronics pass on the surface
of the conductor. So the air outside the conductor surface
becames conducive and looks bluish and due to dielectric
breakdown of air a hissing noise comes from surrounding,
Called as corona !

Due to corona OZONE formation on the outside surface of the
conductor. The effect of this to the power system is called
as corona effect.

Answer / ali chand

the ioization of air molecules around the conductor ,when
the phase voltge is increased beyond certain voltage is
called corona

Answer / sunny ponna

if we consider two conductors due to potential difference b/w them a violet glow is abserved around the conductor .
if the potential difference is further increased sparkover may happen . this phenomenon is named as corona

Answer / r.ezhilan

corona effect means long transmission line electro magnetic
field ,So all electron will flow surface of conductor,Some
of electron will try to flow to ground thrugh moisture and
unwanted dust that is called corona effect.

Answer / pravin kumar singh

In normal atmospheric condition ion & free electron are always present because of cosmic ray , radioactivity,& ultraviolet ray.When a voltage applied to the conductor a potential gradient in the air near to the conductor ,the free electron & ion start moving.But when these voltage increase very high ,the speed of the electron is very high,and they collide with the neutral molecule & disclosed the electron from it & farther electron acquire high speed & start colliding with the other molecules.the process of ionization is cumulative which finely result in electron avalanche.the ionization of air surrounding the conductors give rise the corona effect.

why did youi choose this career?

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10Hp, 3-phase, 415v, 50Hz induction motor. The above motor is to run on Star-Delta connection, so how do i make following hardware selection 1) MCB, 2) Contactor, 3) Wire Gage (Depending on P-P current or Line Current), 4) OLR, Please tell in detail how to do the above, so as to get the ans. of it even if the Hp rating changes.

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I do wonder why current is present in neutral wire?i check single phase lead current feeding air conditioner...on its phase its current was 10A while same was 10A in neutral...as we know in neutral voltage is zero so if voltage is zero then how current appears on amp meter? my second observation is (just imagination)when I touch phase wire it give me shock but when i touch neutral nothing happens although as above its carrying current(amps) third but with same logic...as in simple Alternate current sine curve there is + and there is negative peak.means every time phase changing so how come every time same phase and same neutral stand (pardon for english mistakes)

1 Answers  

Why use only DC supply to charge batteries why not AC Supply??

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heat can flow from a body at low temperature to a body at higher temperature only when ........ is supplied from an external source A). Voltage B). Current C). work D). Mass

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