Leading or Lagging PF?
Leading or Lagging PF?
(OP)
Hi,
in order to run / operate electrical network,
which type of power factor should we keep having?
if a system runs on leading power factor, what is the main effect ? does it matter to have leading or lagging?
since it just depends on the type of loads
thank you
in order to run / operate electrical network,
which type of power factor should we keep having?
if a system runs on leading power factor, what is the main effect ? does it matter to have leading or lagging?
since it just depends on the type of loads
thank you






RE: Leading or Lagging PF?
If you achieve leading you may cause network stability issues.
You want pf=one or a little lagging.
Keith Cress
kcress - http://www.flaminsystems.com
RE: Leading or Lagging PF?
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If we learn from our mistakes I'm getting a great education!
RE: Leading or Lagging PF?
My experience in transmission system control tells me you need VAr's to keep the voltage up in case of a fault. We'd all like zero cost for transmission, but without VAr's my understanding is you are much more subceptible to instability.
RE: Leading or Lagging PF?
RE: Leading or Lagging PF?
As far as stability, capacitor created Vars are less stable than motor/generator created Vars, from a system perspective. Under a disturbance condition the capacitor created Vars will decrease with the square of the voltage, where the motor/generator created Vars won't decrease as fast.
RE: Leading or Lagging PF?
You are both right, just looking at different time periods. For transient stability after a fault, overexcited machines (thus producing VARs) have a longer (better) critical clearing time than underexcited machines. For longer term voltage stability it it is better to produce the VARs near the loads to prevent voltage collapse.
RE: Leading or Lagging PF?
RE: Leading or Lagging PF?