What Is Power Compensation Controller？
The ZHIMING JKWD Series JKW Reactive Power Compensation Controller is an intelligent auto-compensation device designed for self-regulating capacitor banks in low-voltage distribution systems. Based on full digital AC sampling technology, this Reactive Power Compensation Controller uses reactive power as the primary controlling physical quantity to achieve high-precision power factor correction. It enhances power transformer operating efficiency, reduces line losses, and improves voltage regulation — ultimately increasing ROI and grid reliability. With support for 1 to 12 output loops, dual manual/automatic working modes, and comprehensive digital display of power factor, reactive power, voltage, and current (primary side), the JKW Controller provides a complete solution for power quality management in industrial and commercial electrical networks.
Working Conditions of the JKW Reactive Power Compensation Controller
- Rated Operating Voltage — AC 380V +10% (IEC 60038)
- Rated Frequency — 50Hz ±5%
- Current Input Range — AC 0–5A (maximum continuous)
- Anti-Interference — Resists up to 2000V interference pulse from direct power supply; no crash or data loss under surge conditions
Product Parameters
| Parameter | Specification |
|---|---|
| Rated Voltage | AC 380V +10% (IEC 60038) |
| Rated Current | AC 0–5A (max. continuous) |
| Rated Frequency | 50Hz ±5% |
| Control Parameters | |
| Sensitivity | 100mA (min. operating current) |
| Target PF Setting | 0.70–0.99 (adjustable, 0.01 resolution; factory default: 0.98) |
| Switching Delay | Transient mode: 0.5ms–200s; Steady-state mode: 2–200s |
| CT Ratio Range | 50:5 to 3000:5 (1:1 resolution; factory default: 500:5) |
| Output Capacity | Transient: DC 12V @ 50mA/channel; Steady-state: 380V AC @ 7A/channel or 200V AC @ 5A/channel |
| Measurement Accuracy | |
| Voltage | Class 1.0 (±1.0% of reading) |
| Current | Class 1.0 (±1.0% of reading) |
| Power Factor | ±1.0% |
| Reactive Power | Class 2.0 (±2.0% of reading) |
Product Size
Panel Cut-out Dimensions
| Controller Model | Cutout Dimensions (H × W) | Tolerance | Mounting Notes |
|---|---|---|---|
| JKWD5-16 | 138.0 × 138.0 mm | ±0.5 mm | Square cutout with radius ≤0.5 mm at corners |
| JKWD5 | 113.0 × 113.0 mm | ±0.5 mm | Max. panel thickness: 3.0 mm |
Critical Installation Requirements:
1.Surface Flatness: ≤0.5 mm across cutout area
2. Edge Finish: Burr-free (max. Ra 6.3 μm)
3. Clearance: ≥20 mm behind panel for wiring termination
4. Sealing: Apply an IP54 gasket (included) when used in polluted environments
Engineering Drawing Notation:
JKWD5-16
Ø4.3×4 M4
Mounting Holes
(typical)
Fig. 1: Standard cutout with M4 fastener positions (all dimensions in mm)
Why Choose ZHIMING's Power Compensation Controller?
Full Digital Control & High-Precision PF Regulation
The JKW Reactive Power Compensation Controller adopts AC sampling technology with digital integration and filtration, making it insensitive to harmonic interference. Using reactive power as the primary controlling physical quantity, it achieves high-precision automatic power factor correction with adjustable target PF from 0.70 to 0.99.
Intelligent Switching Optimization & Extended System Life
An optimized automatic control scheme minimizes unnecessary capacitor switching cycles — reducing contactor wear and extending the service life of the entire compensation system. Built-in over-voltage and under-voltage judgment with fast cutoff protects capacitor banks from abnormal voltage conditions, while the configurable 200-second re-insertion delay ensures complete capacitor discharge before reconnection.
Strong Anti-Interference & Data Protection
Capable of withstanding up to 2000V interference pulses from the direct power supply, this Reactive Power Compensation Controller maintains stable operation without crashing or losing data. All control parameters are stored in non-volatile memory, ensuring data integrity even during power failures.
Flexible Configuration & User-Friendly Operation
Equipped with both manual and automatic working modes, the controller supports easy on-site commissioning and debugging. The digital display provides real-time readout of power factor, reactive power, voltage, and current (primary side), while the current sampling input resistance below 0.05Ω allows direct connection from measuring loops without additional signal conditioning.
FAQ
What is the main purpose of this Reactive Power Compensation Controller?
The JKW Reactive Power Compensation Controller automatically regulates capacitor banks in low-voltage distribution systems to maintain the target power factor. By minimizing reactive power drawn from the grid, it improves transformer efficiency, reduces line losses, and lowers electricity costs while enhancing overall voltage stability.
How many capacitor switching loops does this controller support?
The JKWD Series supports 1 to 12 output loops, configurable based on the compensation system size. Each loop can operate in either transient mode (DC 12V @ 50mA) or steady-state mode (AC 380V @ 7A / AC 220V @ 5A), accommodating various contactor and thyristor switching configurations.
Can the target power factor be adjusted on this Reactive Power Compensation Controller?
Yes. The target power factor is programmable from 0.70 to 0.99 with 0.01 resolution (factory default: 0.98). All control parameters — including CT ratio (50:5 to 3000:5), switching delay, and sensitivity — are fully adjustable via the digital interface and retained in non-volatile memory after power-off.
How does the controller protect capacitors from over-voltage conditions?
The controller continuously monitors voltage and automatically executes fast cutoff of capacitor banks when over-voltage or under-voltage is detected, preventing capacitor damage. The built-in re-insertion delay (configurable up to 200 seconds per capacitor group) ensures complete discharge before reconnection, reducing inrush current impact on the electrical network.
What is the advantage of the AC sampling and digital filtration technology?
The AC sampling and digital integration technology makes the controller insensitive to harmonic distortion, ensuring accurate reactive power measurement even in electrically noisy environments. Combined with the <0.05Ω current sampling input resistance, it delivers reliable Class 1.0 voltage/current accuracy and ±1.0% power factor precision without requiring external signal conditioners.
