What is Reactive Power and Why Does It Matter?
Electrical systems have two power components: active power (kW) and reactive power (kVAR). Active power does useful work running machines. Reactive power creates magnetic fields for motors and transformers but produces no useful work.
The Reactive Power Problem
| Issue | Impact |
|---|---|
| Low power factor | Higher electricity bills |
| Excess current draw | Cable and transformer heating |
| Voltage drop | Equipment performance loss |
| Utility penalties | Up to 30% additional monthly cost |
How Does a Power Factor Correction Panel Work?
A PFC panel adds capacitive reactive power to the system, compensating for the reactive power consumed by inductive loads.
Key Components
- Power Factor Controller - Monitors cos phi and manages switching stages
- Capacitor Banks - Generate reactive power (typically 5-50 kVAR stages)
- Contactors - Switch capacitors in/out of circuit
- Fuses/Breakers - Protection devices
- Reactors (Optional) - For harmonic filtering
Compensation Types
| Type | Application | Advantage |
|---|---|---|
| Centralized | Near main switchboard | Low cost |
| Group | At each MCC | Medium efficiency |
| Individual | Per motor | Highest efficiency |
Power Factor Regulations in Turkey
Turkey's energy regulator (EPDK) imposes reactive power penalties on consumers with low power factors:
Penalty Calculation
- Inductive Limit: cos φ > 0.98 required
- Capacitive Limit: cos φ < 1.00 required
- Penalty: 50% of active energy price for each excess kVARh
Example Calculation
Monthly active consumption: 100,000 kWh
Reactive consumption: 40,000 kVARh
Free allowance: 100,000 x 0.20 = 20,000 kVARh
Penalized amount: 40,000 - 20,000 = 20,000 kVARh
Penalty cost: 20,000 x (unit price x 0.50) = $$$
Selecting the Right PFC System
Step 1: Load Analysis
- Current power factor measurement
- Load profile analysis
- Harmonic analysis
Step 2: Capacity Calculation
Required kVAR = P x (tan φ₁ - tan φ₂)
Example:
P = 500 kW, cos φ₁ = 0.70, cos φ₂ = 0.98
kVAR = 500 x (1.02 - 0.20) = 410 kVAR
Step 3: Harmonic Evaluation
- THD > 5% requires detuned reactor system
- THD > 12% requires active filter
DOA Enerji Power Factor Correction Solutions
DOA Enerji designs and manufactures project-specific PFC panels:
Product Features
- ✅ 50-1000 kVAR capacity range
- ✅ 7% or 14% detuned reactor systems
- ✅ Harmonic filtered models
- ✅ SCADA compatible monitoring
- ✅ IEC 61921 compliant
- ✅ 2-year warranty
Our References
- Metro Grosmarket retail chains
- Industrial manufacturing facilities
- Commercial buildings and shopping centers
Get a free reactive power analysis for your facility.