Typical primary plan
Rated Parameters
| S/N | Name | Unit | Load switchgear C | Circuit breaker cabinet V | Combined electric cabinet F |
| 1 | Rated voltage | kV | 35.0 |
| 2 | Rated frequency | Hz | 50/60 |
| 3 | Rated current | A | 630 | 630 | 1250 | 80 |
| 4 | Rated short-time
power frequency
withstand voltage | Phase-to-phase and
Phase-to-earth | kV | 70/95 |
| Across isolating distance | kV | 80/118 |
| 5 | Rated lightning
impulse
withstand voltage | Phase-to-phase and
Phase-to-earth | kV | 170/185 |
| Across isolating distance | kV | 195/215 |
| 6 | Rated peak withstand current | kA | 50 | 50 | 50/63 | |
| 7 | Rated short-time withstand current | kA | 20 | 20 | 20/25 | |
| 8 | Rated short circuit duration | s | 4 | 4 | 4/2 | / |
| 9 | Rated short circuit breaking current | kA | / | 20 | 20/25 | 31.5 |
| 10 | Closing current (peak) | kA | 50 | 50 | 50/63 | 80 |
| 11 | Electrical life rating
(main switchgrounding switch) | / | E2 | / |
| 12 | gas rated pressure (20℃) | MPa | 0.045 |
| 13 | annual gas leakage rate | % | ≤0.01 |
| 14 | Mechanical endurance for circuit breaker | Time(s) | / | 10000 | / |
| 15 | Mechanical endurance for load switch | Time(s) | 5000 | / | 5000 |
| 16 | Mechanical endurance for isolating switch | Time (s) | / | 3000 | / |
| 17 | Mechanical endurance for grounding switch | Time (s) | 3000 | 3000 | 3000 |
| 18 | Gas tank protection degree | / | IP67 |
| 19 | Shell protection degree | / | IP4X |
Product Overview
QLG series ring main unit is a SF6 gas insulated metal enclosed switchgear independently developed and produced by our company. The equipment uses SF6 gas as insulation and breaking medium, and the load switch, vacuum circuit breaker and live busbar are all sealed in a closed stainless steel container filled with a certain pressure. The external American standard / European standard bushing is connected with the incoming and outgoing cable through the cable joint to form a fully insulated and fully closed structure. This effectively prevents flooding and withstands contamination, making it suitable for various harsh environments. The product is widely used in 35kV ring network or terminal power supply system.
Product Features
Modular and expandable
The use of expansion modules in coordination allows for up to five modules with the same gas tank. Beyond that, further expansion is achieved through busbar expansion.
Maintenance Free
SF6 gas integrated structure, with moving and static contacts, arc extinguishing chamber, busbar sealed in the same gas tank. It is designed for a maintenance-free life of 30 years.
Reliable Mechanical Interlock
It has a variety of reliable mechanical interlocks, and there are analog signs on the cabinet panel to fully ensure the safety of operation.
Automatic and Intelligent
Cooperate with DTU to realize automatic and intelligent control.
Product Tags:
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35kV QLG Series SF6 Gas Insulated RMU Images
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