Brand: WEIJI
Series: Ring main unit
USES: High security, high reliability of urban high voltage ring network distribution solutions
Country: China
SF6 is a high-voltage switchgear in which all high-voltage live parts are sealed in the gas box, which can completely prevent operators and maintenance personnel from touching high-voltage parts, ensuring the personal safety of maintenance personnel. At the same time, it can prevent harmful substances such as moisture and dust in the external environment from affecting the insulation level and operating life of live parts, ensuring reliable operation of the equipment throughout its life cycle. The protection level of the gas box is IP42, and adding a protective shell can meet the requirements of outdoor use. In addition, the cabinet is compact in design and small in size, which is convenient for handling and transportation and can save space.
1. Equipped with a ±0.1mm high-precision industrial robot, it achieves millimeter-level control of switchgear bending and assembly, achieving a component standardization rate of ≥99% and a dimensional qualification rate exceeding 99.5%.
2. All its live parts and switches are enclosed in a stainless steel housing and are not affected by external environmental conditions, thus ensuring high reliability and safety and achieving maintenance-free operation.
3. Compatible with various brands of circuit breakers, including components from brands such as ABB and Siemens.Meet the diverse needs of users.
4. Each functional compartment in the switchgear is separated by metal partitions and equipped with independent pressure relief ducts.
6. Full-Scenario Verification and Intelligent Logistics System:
Cabinet Parallel Testing – Real-World Simulation
Full-Scenario Simulation Testing: Load Simulation, Emergency Operation Verification (Opening and Closing Response Time ≤ 20ms)
Multi-Device Interlocking Testing (Protection Device/Transformer Coordination Error <1%)
Triple Performance Verification: Passed a 72-hour full-load temperature rise test and a mechanical life test of ≥10,000 cycles
| Name | Unit | Load switch unit | Combined electrical unit | Circuit breaker unit | ||
| Rated voltage | kV | 12/24 | ||||
| Rated frequency | Hz | 50/60 | ||||
| Rated current | A | 630 | ≤125 | 630/1250 | ||
| Rated insulation level | 1‑minute power frequency withstand voltage | power frequency withstand voltage (phase‑to‑phase and phase‑to‑ground) | kV | 42/65 | ||
| power frequency withstand voltage (inter‑break) | 48/79 | |||||
| lightning impulse withstand voltage (peak) | power frequency withstand voltage (control and auxiliary circuits) | 2/2 | ||||
| lightning impulse withstand voltage (phase‑to‑phase and phase‑to‑ground) | 75/125 | |||||
| lightning impulse withstand voltage (inter‑break) | 85/145 | |||||
| Rated short‑time withstand current | main circuit/4s | kA | 20/20 | 20/25 | ||
| Ground circuit/4s | 20/20 | |||||
| Ground connection circuit/4s | 17.4/17.4 | 17.4/21.7 | ||||
| Rated peak withstand current | main circuit | kA | 50/50 | 50/63 | ||
| ground circuit | 43.5/43.5 | 43.5/54.5 | ||||
| Rated short‑circuit making current | kA | 50 | 80 | 50/63 | ||
| Rated short‑circuit breaking current | A | 31.5 | 20/25 | |||
| Rated transfer current | A | 1500/1400 | ||||
| Rated active load breaking current | A | 630 | ||||
| Rated closed‑loop breaking current | A | 630 | --- | |||
| Rated cable charging breaking current | A | 10/25 | ||||
| Mechanical life | load switch/earthing switch | 5000 | 5000 | 10000 | ||
| isolating switch/earthing switch | batch | 2000 | 2000 | 3000 | ||
| SF6 gas rated pressure(relative value at 20°C) | Rated filling pressure | Mpa | 0.04 | |||
| Minimum functional level pressure | 0.02 | |||||
| Protection level | Sealed enclosure | IP67 | ||||
| Switchgear enclosure | IP4X | |||||
| Annual relative gas leakage rate | %/Y | ≤0.01 | ||||
| Main technical parameters | ||||||
| Number | Item | Unit | Load switch unit | Combined electrical unit | Circuit breaker unit | |
| 1 | Rated voltage | kV | 40.5 | 40.5 | 40.5 | |
| 2 | Rated frequency | Hz | 50 | 50 | 50 | |
| 3 | Rated current | A | 630 | 63 | 630 | |
| Rated insulation level | 1‑minute power frequency withstand voltage (phase‑to‑phase, to ground) | kV | 95 | 95 | 95 | |
| 1‑minute power frequency withstand voltage (across the isolating fracture) | kV | 118 | 118 | 118 | ||
| 4 | 1‑minute power frequency withstand voltage (control and auxiliary circuits) | kV | 2 | 2 | 2 | |
| Lightning impulse withstand voltage (phase‑to‑ground) | kV | 185 | 185 | 185 | ||
| Lightning impulse withstand voltage (across the isolating fracture) | kV | 215 | 215 | 215 | ||
| 5 | Rated short‑circuit breaking current | kA | 20 | 20 | ||
| 6 | Rated short‑time withstand current (main switch/earthing switch) | kA | 20/20 | 20/20 | ||
| 7 | Rated short‑circuit duration | S | 3 | 3 | ||
| 8 | Rated peak withstand current (main switch/earthing switch) | kA | 50/50 | 50/50 | ||
| 9 | Rated short‑circuit making current (main switch/earthing switch) | kA | 50/50 | 50/50 | ||
| 10 | Rated number of short‑circuit closings (main switch/earthing switch) | 次 | 3/2 | |||
| 11 | Rated transfer current | A | 750 | |||
| 12 | Rated active load breaking current | A | 630 | |||
| 13 | Internal arc test level | IAC级AFL 20kA/0.5s | ||||
| Mechanical life | Circuit breaker (M2) class | 10000 | ||||
| 14 | Load switch (M2) class | 次 | 5000 | 5000 | ||
| Grounding switch (M1) class | 次 | 3000 | 3000 | 3000 | ||
| 15 | Inflation Pressure | Rated Inflation Pressure (gauge pressure at 20°C) | bar | 1.4 | ||
| Minimum Inflation Pressure (gauge pressure at 20°C) | bar | 1.2 | ||||
| 16 | Annual relative gas leakage rate | %/年 | 0.01 | |||
| 17 | SF6 gas moisture content (ambient temperature 20°C) | ppm | ≤500 | |||
| Protection level | Gas box | IP67 | ||||
| 18 | Sealed box | IP67 | ||||
| Switchgear housing | IP3X | |||||
Notice: There is a chance that WEIJI may make changes on above-mentioned information. Product pictures and parameters about models, data, performances and specifications on this website are for reference only.
