Power Factor Correction Capacitor + Electric Arc Furnace Transformer
Power Factor Correction Capacitor + Electric Arc Furnace Transformer
(OP)
My client, a steel manufacturer, has an electric arc furnace transformer with power correction capacitors connected on the incoming HV side. During power outage, he has noticed heavy inrush currents and voltage spikes for a very short period. I know that in ac induction motor connected permanently with power factor correction capacitor, heavy inrush currents and high voltages occur during power outage due to induction generator effect created by still rotating motor. Will such phenomenon occur in a transformer-capacitor circuit also ? I reason that transformer being a static unit, there is no stored energy to produce to such transient inrush currents and voltages. Or am I wrong ?






RE: Power Factor Correction Capacitor + Electric Arc Furnace Transformer
read "electric arc furnace transformer with power correction capacitors" as
"electric arc furnace transformer with power factor correction capacitors".
RE: Power Factor Correction Capacitor + Electric Arc Furnace Transformer
RE: Power Factor Correction Capacitor + Electric Arc Furnace Transformer
RE: Power Factor Correction Capacitor + Electric Arc Furnace Transformer
I will post that information the moment I get it. In the mean time, you got any ideas about my question "whether the arc furnace trafo with parallel power factor correcting caps will behave like an induction motor (or rather induction generator) on power loss " ?
RE: Power Factor Correction Capacitor + Electric Arc Furnace Transformer
I reason that transformer being a static unit, there is no stored energy to produce to such transient inrush currents and voltages.
///The transformer also contains energy (See SMETs) that will be exchanging with capacitor stored energy (energy oscillation) until fully damped by resistances.\\\
Or am I wrong ?
///Visit
http://www.afrlhorizons.com/Briefs/Dec01/ML0009.html
http://www.energy.ca.gov/distgen/equipment/energy_storage/energy_storage.html
for SMESs, which are in essence large magnetic coils holding energy.
etc. for more info.\\\
RE: Power Factor Correction Capacitor + Electric Arc Furnace Transformer
Edison—your client may be experiencing a ferroresonant condition in capacitor-transformer interaction at some point during voltage decay. A search on ferroresonance in Forum238 should yield significant discussion and references. Without some instrumentation to monitor the affected system, causes and effects may remain speculative.
RE: Power Factor Correction Capacitor + Electric Arc Furnace Transformer
http://www.pserc.wisc.edu/cgi-pserc/getbig/publicatio/2000public/heydt_korea2000.pdf
You may find that your customer is not having a problem.
RE: Power Factor Correction Capacitor + Electric Arc Furnace Transformer
Thanks for your good tips. They were useful.
RE: Power Factor Correction Capacitor + Electric Arc Furnace Transformer
RE: Power Factor Correction Capacitor + Electric Arc Furnace Transformer
RE: Power Factor Correction Capacitor + Electric Arc Furnace Transformer
http://www.cooperpower.com/Products/Systems/Setup/summer98.pdf
for Harmonic Measurements article by Frank DeCesaro
http://www.cooperpower.com/Products/Systems/Setup/summer96.pdf
for:
1. Ferroresonance article
2. Arc furnace article
http://grouper.ieee.org/groups/harmonic/iharm/docs/ih519.pdf
for: Arc furnaces interharmonics