Answer / krishna kant kamal

The distribution of current throughout the
cross-section of a conductor is uniform only when DC
is passing through it. on the contrary when AC is
lowing through a conductor, the current is non-uniformly
distributed over the cross-section in a manner that
the current density is higher at the surface of the
conductor compared to the current density at its centre.
This effect becornes more pronounced as frequency is
increased. This phenonlenon is cilled stir qffect.It
causes larger power loss for a given rms AC than the
loss when the Same vaiue of DC is flowing ihrough the
conciuctor. Consequently, the effective conductor
resistance is more for AC then for DC

Answer / risandha

AC has more lossess

Answer / vicky

tat s not stir effect.. tat s called as skin effect.. AC has more losses...

Answer / sunil parmar

IN DC SYSTEM CURRENT DISTRIBUTION IS UNIFORM COMPARED TO AC,SO AC HAS MORE LOSSES.

diff b/w normal grounding and resistance grounding

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what is mean by NTPC?,why didn't electric shock in train?

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why we dont prefer ac voltage controller instead dimmerstat [if both have same rating] for conducting experiments in laboratories?

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Can I use measuring current transformers in protection purposes?

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in transformer star connection with neutral are shorted. is there is any effect.

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why vector group is ued

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what is the difference between 'Control Transformer & Potential/Voltage Transformer'?

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Just a silly question but just to make my curious mind bac to normal - Why was not 67 and 67N relays built into a single relay as i have noticed that the R,Y,B CT wiring end up into the 67 relay while the common of the R,Y,B CT wiring end up into the 67N relay. Then it was better if a single relay was manufactured just like the distance relay (21). Another question i would like to ask is - how do we know where the 67 and 67 N relay has to be placed.why is it not placed at the transformer bay? In the substaion that i am working -i have noticed that it is placed between a breaker and a common double bus bar and this line bay is connected to another substation at a remote place which is furthur connected to a load. B U S______CT for 67 & 67N ______Breaker _____ remot s/s. B A R

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How do I know if a transformer is saturated? I am doing the simulation of the saturation of a transformer, but what parameter tells me when a transformer is saturated? How do you calculate? is on the plate?, there is a rule that can help me? How could model? I understand the saturation occurs when the flow can no longer bind to the other winding, this is given to certain current, this current is the same that appears as the highest in the bale of features? Thank you for your help Eduardo Alvarez Guatemala

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