| Brand | ROCKWILL |
| Series | DDPC |
| DC Rated Voltage | Up to 3400 V |
| Rated RMS Current | Up to 800 A |
| Creepage Distance | 52 mm |
As power electronics technology advances and global demand for eco‑friendly, safe and high‑reliability power equipment rises, conventional oil‑filled capacitors face critical drawbacks including oil leakage risks and environmental pollution. Such issues may trigger sudden short‑circuits or unexpected power outages, failing to meet the strict requirements of modern voltage‑source converter topologies.
To address these challenges, oil‑free soft‑cell dry‑type DC capacitors are developed. They deliver high‑capacity performance with minimized environmental impact, serving as an ideal solution for next‑generation power conversion systems.
Oil‑free & Eco‑friendly: Adopts non‑oil soft‑cell structure, eliminating leakage risks and complying with global green power standards.
High operational reliability: Modular construction with self‑healing metallized film. In case of partial failure, capacitance degrades gradually instead of causing short‑circuit or full power outage.
Compact & high energy density: Smaller footprint with equivalent capacity to bulkier oil‑filled capacitors, saving installation space. Can be mounted together with IGBT valves to reduce inductance and component stress.
End‑of‑life safety: Segmented design improves safety performance in later service stages, ensuring long‑term stable operation.
| Category |
Parameter |
Value |
|---|---|---|
| Electrical Ratings |
Capacitance Range |
Up to 7.4 mF |
| Electrical Characteristics |
Dissipation Factor |
0.0002 |
| Self‑Inductance |
Less than 75 nH at 1 MHz |
|
| Insulation Performance |
Terminal‑to‑Casing Withstand Voltage |
5200 V AC, 10 seconds |
| Temperature Range |
Operating Temperature |
+5 °C ~ +60 °C |
| Storage Temperature |
−40 °C ~ +70 °C |
|
| Core Technology |
Dielectric Material |
Self‑healing metallized polypropylene film |
| Filling Material |
Polyurethane, Resin, Oil‑free design |
|
| Safety Protection |
Self‑healing technology + Fuse segmentation |
|
| Grading Resistors |
Not required |
Ideal for high‑reliability power conversion applications with strict safety and environmental requirements:
HVDC transmission systems
SVC & FACTS power quality converters
High‑power industrial motor drives
Hazardous‑environment converters such as offshore oil platforms
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