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olivier bouilliez
ParticipantPower factor is related to lagging between current and voltage .
Of course, for a given load and voltage, power factor will change with frequency as relative impedances of coils and purely resistive loads will change.
olivier bouilliez
Participantolivier bouilliez
ParticipantI advise you nto go through the free elearning “get to know the main switchgear functions” that will answer most of your questions :
olivier bouilliez
ParticipantHi Syed,
I always have the same reply : go to the reference guide ….
Wiki-Electrical Installation Guide : Reactive_energy_and_power_factor
olivier bouilliez
ParticipantSurge protection devices have to be selected after a complete study of the installation .
You will find good documents in
http://www2.schneider-electric.com/sites/corporate/en/customers/designers/designers.page
Download the following : CT 179 – LV Surges and Surge Arresters – LV Insulation Co-ordination
olivier bouilliez
ParticipantCould you please add details to your question ?
I presume that you are speaking of LV panels .
If the breaker trips, and there is no other switching device downstream, then anyway the load is unpowered . So the best way is first visual inspection and then disconnect the circuit as downstream as possible and measure the circuit impedance . If OK, repeat upstream until you locate the S C area .
2012/03/05 at 3:42 pm in reply to: Applications where LV fuses are technically more adapted than LV circuit-breakers? #12865olivier bouilliez
ParticipantAgree with holwa on discrimination for small ratings . Be careful to at least have a gap in the fuse ratings series . For example, you may loose discrimination with 10A, 16A, 25A . In this case, the three ratings are too close.
olivier bouilliez
ParticipantHi,
I suggest you refer to the post made in 2009 on the blog of this site
/power-quality/5-8-electrical-equipment-harmonics-power-factor.html#more-1833
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