๐ What is Power Factor?
Power Factor (PF) is the ratio of real power (kW) to apparent power (kVA). It indicates how efficiently electrical power is being used. PF = kW รท kVA. A PF of 1.0 (unity) means all power is being used effectively.
๐ Power Factor Formulas
PF = P / S | ฯ = cosโปยน(PF) | Q = S ร sin(ฯ)
๐ Power Factor Guide
| PF Range | Status | Action Needed |
|---|
| 0.95 - 1.00 | โ
Excellent | No correction needed |
| 0.85 - 0.95 | ๐ Good | Minor correction may help |
| 0.75 - 0.85 | ๐ Average | Correction recommended |
| 0.60 - 0.75 | โ ๏ธ Poor | Urgent correction needed |
| Below 0.60 | โ Very Poor | Immediate action required |
๐ก Why PF Correction Matters
- Lower Electricity Bills: Utilities charge penalties for low PF (below 0.85-0.90)
- Reduced Losses: Lower current means less IยฒR losses in cables
- Increased Capacity: Improves available capacity of transformers and generators
- Better Voltage Regulation: Reduces voltage drops in distribution systems
โ Frequently Asked Questions
What is Power Factor? โผ
Power Factor is the ratio of real power (kW) to apparent power (kVA). It indicates how efficiently electrical power is being used. PF = kW รท kVA. Higher PF means better efficiency.
What is a good power factor? โผ
A PF of 0.95 or higher is considered excellent. Utilities often penalize industrial consumers for PF below 0.85-0.90. Most facilities aim for 0.90-0.95.
What causes low power factor? โผ
The most common causes are induction motors running at less than full load, under-loaded transformers, welding equipment, VFDs, and long distribution lines with high inductance.
How to improve power factor? โผ
The most common method is installing capacitor banks. Other methods include using synchronous motors, active harmonic filters, and static VAR compensators.