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omkar_991
Associate

Join Date: Jun 2007
Posts: 25

Power surge

06/15/2007 2:38 PM

What is the difference between a power surge and a current surge?

Why do we experience a sudden surge when electricity is restored after a failure? (a bulb that is already switched ON may simply burst and go off)
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V.I.Abraham
Guru
Safety - ESD - New Member India - Member - New Member Engineering Fields - Energy Engineering - New Member

Join Date: May 2007
Location: Pune , India
Posts: 875
Good Answers: 42
#1

Re: Power surge

06/28/2007 5:46 PM

If I understand correctly you want to know the difference between surge voltage and surge current. Surge Voltage is the voltage spikes created in electrical network due to lightening , switching of breakers etc. Surge current is large in rush current caused during starting of motors etc in electrical circuits.During switching on of breakers there is sudden rate of change of magnetisation in large transformers which in turn induces surge voltages in system.

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Anonymous Poster
#2

Re: Power surge

07/09/2007 5:29 AM

answer no. 1 is very good, in addition the equipment failure is happen in case of direct application of power to the equipment as the switching gear (breaker...etc) is reducing this voltage & current spikes rather than its direct application on the equipment

Islam

eslammourad@hotmail.om

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