Battery Charging Plant
TYPE OF INDUSTRY – Battery Charging Plant at Himachal Pradesh, India.
YEAR OF IMPLEMENTATION – 2014
- Low Power factor
- High KVAH consumption
- High breakdown
- Frequent failure of existing capacitor bank
- Heating of transformer and cables.
After conducting Power Quality Audit in the plant, following observations are made:
Total Harmonic Distortion (THD) current is 64.60%
THD voltage is 23%
Power factor is 0.82
Due to resonance effect between conventional type APFC & system inductive impedance, the harmonic current amplify to dangerous level and badly affect Power Quality of whole electrical system.
Detune Resonance condition by providing suitable Passive Harmonic Filter Banks.
Add Digitally controlled Active Harmonic Filter Bank to control THDI & THDV < 5% as per IEEE 519-1992
System Improvement Post Implementation
Measurement at main incomer 4000A ACB, 433V Supply
|Sr No.||Parameters||Before Installation of Harmonic Filter banks||After Installation of Harmonic Filter bank|
|1.||Fundamental current I1 Amp||1975 A||1974|
|2.||3rd Harmonic Current I3||—||27A|
|3.||5th Harmonic Current I5||1235 A||57A|
|4.||7th Harmonic Current I7||201 A||23|
|5.||11th Harmonic Current I11||62 A||54|
|6.||13th Harmonic Current I13||30 A||27|
|7.||Total Harmonic Distortion Current %||Rph-64.6%, Yph-60.4%, Bph-57.5%||Rph-4.4%, Yph-4%, Bph-5.4%|
|8.||Total Harmonic Distortion Voltage %||23 %||4 %|
|9.||Cos Ø||0.99||1.0 lag|
|10.||True Power Factor PF||0.82||0.996 lag|
|11.||True RMS current Amp||2348 A||1999 A|
|12.||True RMS Voltage V/ Phase||234 V||230 V|
THDI & THDV reduced to < 5% from initial value of 65% & 23% respectively after Installation of Harmonic Filters.
PF improvement to unity (1.0) from 0.82 lag
Apprx 20% saving in KVA demand.
Apprx 7% saving in Monthly units consumption.