China SF6-free Dead Tank Circuit Breaker Manufacturer-72.5 kV
Key attributes
| Brand | ROCKWILL |
| Series | RVD |
| Rated voltage | 72.5kV |
| Rated frequency | 60 Hz |
| At lightning impulse | 350kV |
| Rated normal current | 1200/2000/3000 A |
| Rated short-circuit making current | 100 kA |
Description
Rockwill Group is a leading high-tech enterprise in China, specializing in the R&D, manufacturing, and sales of medium- and high-voltage switchgear and components for over 20 years. Following Pinggao Electric, XD Group, and XJ Electric, Rockwill Group is one of the few domestic manufacturers in China that has independently mastered the core technology of 72.5kV SF₆-free dead tank circuit breakers and successfully commercialized the product.
Based on this expertise, we have developed an SF₆-free dead tank circuit breaker (DTCB) that is very similar to its SF₆ predecessor. Using our g³ insulating and switching SF₆-free technology, the new RVD-72.5 remains compact with the same footprint. Performance and life cycle costs remain similar while offering a significant decrease in the carbon footprint.
The SF₆-free gas mixture used in the new RVD-72.5 works on the same well-known principle for insulation and breaking purposes as that of SF₆ gas. The g³ gas is a mixture of carbon dioxide (CO₂) with oxygen (O₂) and a small percentage of an additive (C4F7N), whose physical properties are essential to g³. Its contribution to global warming is significantly lower than that of SF₆ gas – reduced by 99%.
Product Showcase Video
Main Characteristics
Advanced self-blast interrupters
- Shares many components with the RHD-72.5 SF₆ circuit breaker
- Durable low-energy spring-spring operated mechanisms
- 2 μs chopped wave 452 kV
- Zero bar withstand capability
Easy System Integration
- Breakers are completely factory assembled, wired and tested before shipment
- Similar operational and maintenance procedures as with SF₆ circuit breakers
- Compact design that’s common to all substation applications, including extension of existing substations
Technical specifications
| IEC | VALUE | UNITS |
|---|---|---|
| Rated voltage | 72.5 | kV |
| Rated frequency | 60 | Hz |
|
Rated insulation level
|
160 | kV |
| 140 | kV | |
| At lightning impulse | 350 | kV |
| Rated normal current | 1200/2000/3000 | A |
| Rated short-circuit breaking current | 40 | kA |
| Rated short-circuit making current | 100 | kA |
| Rated break time | 50 | ms |
| Rated operating sequence | O-CO-15s-CO O-0.3s-CO-180s-CO |
|
Dimensions
Environmental Conditions
| Ambient air temperature upper limit | +40 °C |
| Ambient air temperature 24-hour average | +35 °C |
| Ambient air temperature lower limit | –30 °C |
| Altitude above sea level | ≤ 1000 m |
| Relative humidity (24-hour average) | ≤ 95% |
| Relative humidity (monthly average) | ≤ 90% |
| Water vapor pressure (24-hour average) | ≤ 2.2 kPa |
| Water vapor pressure (monthly average) | ≤ 1.8 kPa |
| Solar radiation | ≤ 1000 W/m² |
| Pollution level | Level III |
| Seismic capability | High seismic per IEEE 693 |
Application Scenarios
- Urban & Industrial 72.5 kV Distribution Substations
- Renewable Energy Step-Up / Grid Integration
- Existing Substation Retrofit & Extension
- High-Seismic Regions
- Green / Eco-Sensitive Grid Projects
Documentation Resource Library SF₆-free Dead Tank Circuit Breaker
FAQ for SF₆-free Dead Tank Circuit Breaker
Yes. It keeps the same compact footprint as its SF₆ predecessor. Maintenance and operation procedures are similar, easy for substation retrofit and extension.
Rockwill is one of the few Chinese manufacturers that independently mastered and commercialized 72.5kV SF₆-free dead tank breaker core technology, with over 20 years of MV & HV switchgear R&D and production experience.
It is equipped with advanced self-blast interrupters and durable low-energy spring-spring operating mechanisms. Many parts are interchangeable with RHD-72.5 SF₆ circuit breaker.
The breaker is fully assembled, wired and tested in factory before shipment to simplify on-site installation and commissioning.
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