JKX intelligent filtered capacitor assemblies combine low-voltage power capacitors, switching, monitoring and a magnetic filtering arrangement for reactive power compensation in systems containing harmonics. The application range specifies harmonic-current content below 40%, including installations with inverter loads. Filtering is intended to restrict switching surge and harmonic components including the 3rd, 5th, 7th and 9th.
The modular system supports simultaneous three-phase or individual-phase compensation. It monitors voltage, current, reactive power, power factor, CT phase sequence and ratio, individual capacitor phase currents and internal temperature. Calibration and self-diagnosis are included. Capacitor status, compensation state, voltage alarms and protection events can be indicated or communicated.
| Parameter | Specification |
|---|---|
| Rated supply options | 220VAC or 380VAC |
| Voltage deviation | ±20% |
| Supply waveform | Sinusoidal; total voltage distortion ≤7% |
| Frequency | 50Hz±5% |
| Control-unit consumption | <2W |
| Ambient temperature | -25°C to +55°C |
| Relative humidity | 20-90% at 40°C |
| Altitude | <2000m |
| Simultaneous compensation output | ≤40kvar |
| Separate-phase compensation output | ≤20kvar |
| Connected capacitor units | ≤32 |
| Switching interval | Nominal 10s; adjustable from 1s to 10s |
| Electrical safety reference | DL/T842-2003 for clearances, creepage, insulation and relevant control/protection circuits |
| Function | Accuracy | Applicable range |
|---|---|---|
| Voltage measurement | ≤0.5% | 80-120% of rated voltage |
| Current measurement | ≤1% | 5-20% of rated current |
| ≤0.5% | 20-120% of rated current | |
| Power factor measurement | ±1.5% | — |
| Temperature measurement | ±1°C | — |
| Voltage protection | ≤0.5% | — |
| Current protection | ≤1.0% | — |
| Temperature protection | ±1°C | — |
| Protection timing | ±0.01s | — |
The controller tracks reactive power and selects capacitor groups according to their available output. Equal-output groups operate in rotation; different outputs are selected to match demand. The first connected group is released first and the group with the longest off-time is connected first. Cooler units receive connection priority and hotter operating units are released first. Under a constant operating condition, the rotation interval is 15 minutes.
Protection functions cover circuit overcurrent, capacitor overvoltage, undervoltage, overtemperature, phase loss and three-phase imbalance. A capacitor temperature above 65°C causes the assembly to leave service. The control unit also disconnects an assembly when self-diagnosis detects a fault.
RS485 links the capacitor units, controller and external monitoring equipment for data exchange. Wired and wireless networking configurations are described for the wider system. Specify the communication arrangement and compensation method for the required installation.
| Parameter | Listed value |
|---|---|
| Permissible switching operations | 200000 |
| Capacitance reduction per year | ≤1% |
| Capacitance reduction per 10000 operations | ≤0.1% |
| Annual failure-rate criterion | ≤0.1% |
