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Anonymous Poster

11/23/2008 3:08 AM

What happend if we are maintaing leading power factor? More then Unity,it may affect the performance of equipment?

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Associate

Join Date: Nov 2007
Location: India
Posts: 41
#1

11/24/2008 12:08 AM

The leading power factor will cause leading VAR.Its effect on the equipments,cables ,relay operation etc is same as that of lagging power factor(due to lagging VAR). Further the leading VAr caused by leading PF will travel in power system grid and will cause instability in the power system.

Hence Leading Pf shall be avoided at any cost at any time.

V.Ambarani

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Guru

Join Date: Mar 2007
Posts: 2547
#2

11/24/2008 5:35 AM

There may not be any effect on the performance of the equipments. However in a unity power factor, there may be problem.

Since the power factor of almost all the load is inductive, it may be preferable to keep a bit lagging power factor, since switching on/off of a load may create

a) A unity power factor making system frequency equal tt natural frequency and hence the circuit may resonate.

b) The leading power factor is basically capacitive (trying to maintain voltage, the current may surge) whereas the lagging power factor will try a constant current.

These current surges may not be good for equipments between the capacitor and the grid.

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Anonymous Poster
#3

11/25/2008 2:10 AM

What are you operating on the system? Motors (and anything with a coil) require a certain amount of reactive power to overcome the 'inertia' of their inductance. Operating a system at leading power factors essentially means you are absorbing reactive power - so less VARs available for overcoming inertia. This will affect the voltage of these bits of equipment, which depending on the system characteristics may result in some damage.