These rectangular low-voltage shunt capacitors use self-healing metallized film for power factor correction. The common dimensional schedule covers 1-20kvar at 400-450V, 50Hz. Select the output and height together; the listed cases share a 170mm length and 60mm width.
The described construction includes an internal discharge resistor, a protective device and a semi-solid impregnant with a dropping point above 70°C.
| Parameter | Specification |
|---|---|
| Installation | Indoors |
| Ambient temperature | -40°C to +45°C |
| Capacitance tolerance | -5% to +10% |
| Terminal-to-terminal withstand | 700VAC for 2-5s |
| Terminals-to-case withstand | 3000VAC for 10s |
| Loss factor | <0.12% |
| Maximum permissible current | 130% of rated current |
| Insulation resistance, terminals to case | >300MΩ at 500VDC for 1 minute |
| Internal discharge | Residual voltage <75V within 3 minutes |
| Voltage relative to rating | Maximum duration | Frequency limit |
|---|---|---|
| 110% | 8 hours | Per 24 hours |
| 115% | 8 minutes | |
| 120% | 5 minutes | No more than twice per month |
| 130% | 1 minute |
| Voltage (kV) | Frequency (Hz) | Output (kvar) | Dimensions (mm) | ||
|---|---|---|---|---|---|
| L | W | H | |||
| 0.4-0.45 | 50 | 1 | 170 | 60 | 150 |
| 2 | |||||
| 2.5 | |||||
| 3 | |||||
| 4 | |||||
| 5 | |||||
| 6 | |||||
| 7.5 | |||||
| 10 | 190 | ||||
| 12.5 | |||||
| 15 | 210 | ||||
| 20 | 250 | ||||
Use crimp terminals with an M5 fixing hole and fit the terminal cover after making the connections. The illustrated fixing torque is 35-40kgf·cm, approximately 3.4-3.9N·m. The mounting drawing shows the installation plate, clamping nut and fixing screw arrangements for the case.
Isolate the circuit and discharge the capacitor before inspecting connections or the enclosure.
| Inspection point | Action |
|---|---|
| Unexpected temperature rise above 15K | Investigate capacitor faults and ambient conditions outside the operating range |
| Rust | Remove corrosion and restore the protective coating |
| Cracked or open enclosure | Replace the capacitor |
| Rain or water exposure | Move the capacitor to a protected indoor installation |
| Loose fixing screws | Check vibration, secure the fixings and use an appropriate mounting location or vibration-control measures |
| Iron particles or dust | Clean light deposits; change the installation location if contamination is excessive |
| Swollen enclosure | Investigate protective-device operation and the cause of damage, then replace the capacitor |
| Leakage | Inspect the enclosure and replace the damaged capacitor |
