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HKFC Power Electronic Capacitors vs other Metal Enclosure Oil Filled Power Capacitors:
| HKFC Power Electronic Capacitors |
Metal Enclosure Oil impregnated Power Capacitors |
|
Durable strong plastic enclosure is relatively safer than metal can protection |
Metal Enclosure – Unsafe, especially for High Voltage applications |
| Higher Insulation Resistance between Capacitor Terminals and Capacitor Body. This is crucial for High Voltage and High Ambient Temperature application |
– Low Insulation Resistance between Capacitor Terminals and Capacitor Body – Capacitor Insulation Resistance will decrease as ambient temperature increase, that makes the situation even worse |
| High Insulation Voltage between Capacitor Two Terminals, and between the Capacitor Terminals and Capacitor Body – much Safer | Low Insulation Voltage |
| Very low Leakage Current between Capacitor Terminals and Plastic Enclosure | High Leakage Current between Capacitor Terminals and Metal Enclosure. This can shorten a lot of problems. |
| Smaller ESR and ESL | Larger ESR and ESL due to the complicated internal connections |
| HKFC Capacitor can be operated up to 105C, depends on customer’s application requirement |
Low operating Temperature, most of the metal can capacitors in the market with +65C rating. |
| Smaller Thermal Resistance Rth, even at 85C and 105C | Higher Thermal Resistance Rth |
| Doesn’t have or small clearance and creepage distance | Larger clearance and creepage requirement |
| Plastic Capacitor Enclosure doesn’t need Grounding | Metal Capacitor Enclosure needs to be Grounding. |
| Plastic Capacitor Enclosure doesn’t have rust and oxidation problem. | Metal Enclosure will have oxidation and rust problems |
| Filled with Epoxy Resin – Dry Design | Filled with Oil Impregnant |
| Doesn’t have the impregnant liquid leakage problem | Impregnant leakage problems – especially oil spillage on-site. This is a disaster to the End User, Application manufacturer and Capacitor manufacturer. |
| Dry design capacitor can be a environmental friendly approach. | Impregnant Oil is not that environmentally friendly |
| All plastic parts, both Plastic Enclosure and Epoxy resin are UL94-V0 grade | Cannot meet UL94-V0 grade |
| HKFC Capacitor can be installed in any orientation | Have installation orientation restriction |
| HKFC Capacitor can withstand stronger external vibration when compared with Metal Case Oil impregnated capacitors |
Cannot withstand vibration |
| More reliable, compact, lighter weight and more energy efficient | Less reliable, compact and Volumetric efficient |
| Longer capacitor life | Shorter capacitor life – Metal Enclosure has rust, oxidation or oil leakage problem |