Metal Clad Fully Enclosed SF6 Ring Main Unit
Metal fully enclosed gas-insulated ring main unit is an SF6 gas-insulated metal enclosed switchgear. This equipment can be composed of modules such as load switch units, load switch-fuse combination units, vacuum circuit breakerunits, and busbar inlet units.
Product Overview
Metal fully enclosed gas-insulated ring main unit is an SF6 gas-insulated metal-enclosed switchgear. This equipment can be composed of modules such as load switch units, load switch-fuse combination units, vacuum circuit breaker units, and busbar inlet units. It incorporates a series of advanced technologies and materials, offering excellent electrical and mechanical performance, minimal impact from environmental and climatic conditions, compact size, easy installation, convenient operation, and maintenance-free use, as well as flexible combination options. Its clear and intuitive design ensures simple and straightforward operation. The feeder connection capacity is large, making it suitable for various wiring systems.
Core Advantage
Technical Description
The gas-insulated high-voltage AC metal-enclosed switchgear is installed on a galvanized sheet frame. The switch units are housed within SF6 gas compartments, which are made of 3mm thick corrosion-resistant and non-magnetic stainless steel plates. The SF6 gas compartment is a "sealed pressure system" that can operate for 30 years under normal working conditions. The normal operating pressure of SF6 gas is 0.15~0.4 bar. The gas compartment is equipped with a pressure relief device to ensure that gas can be released from the bottom or the rear when the pressure is too high.
Switch Unit
The load switch adopts a coaxial rotating double-break design, which operates through the same operating hole in conjunction with a sliding plate, so the switch can only be in one of three states at any time: "closed, open, or grounded," completely preventing misoperation.
Operating Mechanism
The switch operating mechanism is installed at the front outside of the gas compartment, treated with special processes for rust prevention, which facilitates manual operation and maintenance, and can also easily be integrated for electric operation.
Technical Parameters
| Project | Unit | C module load switch unit | F module load switch-fuse combination electric unit | V module breaker unit | |
|---|---|---|---|---|---|
| Rated voltage | kV | 12 | 12 | 12 | |
| Rated current | A | 630 | 125 Note(1) | 630 | |
| Power frequency withstand voltage / 1 minute | kV | Phase/phase | 42 | 42 | 42 |
| Fracture | 48 | 48 | 48 | ||
| Impact pressure | kV | Phase/phase | 75 | - | 75 |
| Fracture | 85 | - | 85 | ||
| Rated closed-loop breaking current | A | 630 | - | - | |
| Rated cable charging breaking current | A | 30 | - | - | |
| Rated breaking inductive current | A | Note(2) | - | - | |
| Rated short-time withstand current /3s | kA | 20 | - | 20 | |
| Rated peak withstand current | kA | 50 | 1700 | 50 | |
| Rated transfer current | A | - | Note(3) | - | |
| Rated short-circuit breaking current | kA | - | - | 20 | |
| Rated short-circuit current | kA | 50 | - | - | |
| Rated short circuit breaking frequency | times | - | - | 30 | |
| Rated short circuit closing times (load switch/grounding switch) | times | 5/5 | - | - | |
| Rated current breaking frequency | times | >100 | - | - | |
| Number of mechanical operations (load switch/grounding switch) | times | 5000/2000 | 5000/2000 | 30000 |