Ring Main Switchgear
Ring Main Switchgear
Modular design
Fully insulated and fully sealed design
New environmentally friendly gas optional
High safety and reliability
Product Overview
JSR series gas insulated compact ring main unit (Gas Insulated Ring Main Unit) is a new type of gas insulated medium voltage independently developed by our company in accordance with the standardization and customization requirements of the State Grid. The switchgear adopts a modular design and can be arranged arbitrarily according to different design plans to achieve the perfect combination of common box units and extended units to meet the needs of various secondary transmission and distribution substations for flexible use of compact switch cabinets.
JSR series switchgear is a completely sealed system. All its live parts and switches are sealed in a stainless steel shell and are not affected by the environment; it has reliable operation and guarantee Safety, compact structure design, small footprint, maintenance-free, long life and other characteristics.
The product has passed the type test verification of the National High Voltage Electrical Test Center and is widely used in small secondary distribution stations, box-type switching stations, industrial and mining enterprises, airports, railways, commercial areas, high-rise buildings, and highways , subways, tunnels and areas with harsh natural conditions.
Technical parameters
| Name | Unit | Load Switch unit (R) | Combined electrical unit (T) | Circuit breaker unit (L) | ||
| Rated voltage | kV | 12/24 | 12/24 | 12/24 | ||
| Rated frequency | Hz | 50 | 50 | 50 | ||
| Rated current | A | 630 | 125 (depending on fuse current) | 630 | ||
| Rated insulation level | 1min power frequency withstand voltage | Phase to phase, ground to ground | kV | 42/65 | 42/65 | 42/65 |
| Fracture | kV | 48/79 | 48/79 | 48/79 | ||
| Control and Auxiliary Loop | kV | 2/2 | 2/2 | 2/2 | ||
| Lightning impulse resistance Voltage | phase to phase, ground | kV | 75/125 | 75/125 | 75/125 | |
| Fracture | kV | 85/145 | 85/145 | 85/145 | ||
| Rated short-time withstand current | kA /s | 25/4 | -- | 25/4 | ||
| Rated peak withstand current | kA | 63 | -- | 63 | ||
| Rated short circuit making current | kA | 63 | Limited by high voltage fuse | 63 | ||
| Rated short circuit breaking current | kA | -- | Limited by high voltage fuse | 25/25 | ||
| Rated transfer current | A | -- | 1700/1400 | -- | ||
| Rated active load breaking current | A | 630 | -- | -- | ||
| Rated closed-loop breaking current | A | 630 | -- | 630 | ||
| Mechanical life | Compliant with switches/circuit breakers | times | 10000 | 10000 | 2000 | |
| Isolating/grounding switch | times | 3000 | 3000 | 3000 | ||
| Loop resistance | μΩ | ≤150 | -- | ≤150 | ||
| Filling gas | SF6/C4 mixed gas | SF6/C4 mixed gas | SF6/C4 mixed gas | |||
| SF6 rated charging pressure ( 20℃ display) | Mpa | 0.14 | 0.14 | 0.14 | ||
| C4 mixed gas rated inflation Pressure (displayed at 20℃) | Mpa | 0.02 | 0.02 | 0.02 | ||
| Relative leakage per year Rate | % | 0.01 | 0.01 | 0.01 | ||
| IP protection level | Cabinet | IP4X | IP4X | IP4X | ||
| Air box | IP67 | IP67 | IP67 | |||
Switchgear dimensions
| Cabinet type | Width (mm) | Depth (mm) | Height (mm) | Instrument box (mm) |
| Load switch cabinet | 375 | 750 | 1600 | 200/350 |
| Circuit breaker cabinet | 420 | 750 | 1600 | 200/350 |
| Combined electrical cabinet | 420 | 750 | 1600 | 200/ 350 |
| PT cabinet | 420/600 (depending on PT capacity) | 750 | 1600 | 200/350 |
Features
Modular design - including load switch unit (R), load switch + fuse combination electrical unit (T), circuit breaker unit (L), metering cabinet unit (M), busbar PT unit (PT), etc. Different modules can Any combination can form a ring main unit.
Fully insulated and fully sealed design - the primary live part (main busbar) and switch body of the JSR series switchgear are sealed in an air box welded by stainless steel plates. The main circuit is connected to the air box through a casing installed on the air box that meets the DIN47636 standard. The external connection can be connected to the incoming and outgoing cables through fully insulated, fully shielded and fully sealed detachable connectors. The protection level of the air box reaches IP67. The inside of the air box is not affected by the external environment and has short-term flood resistance and anti-condensation functions.
New environmentally friendly gas can be used - C4 mixed new environmentally friendly gas can be used, providing users with a green and environmentally friendly choice while maintaining safety, reliability and the same size. The GWP (Global Warming Potential) of C4 mixed gas is only 1/11 compared to SF6 gas. The decrease is more than 90%. Users can choose a more suitable gas according to their preference: C4 mixed gas or SF6, or the products delivered at the moment can be filled with SF6. , but it is completely manufactured and tested according to the C4 mixed gas filling, and can be seamlessly upgraded in the future.
High safety and reliability - the primary live part and the switch body are sealed in a stainless steel gas box and connected to the outside through a casing to avoid direct contact with the live body; the equipment has a reliable pressure release device and pressure relief channel to ensure that failures occur safety of personal equipment. It has a complete mechanical interlocking device. Misoperation can be prevented to the greatest extent.
Product usage environment
Altitude: ≤4000m (please specify when the equipment operates above an altitude of 1000m so that the inflation pressure can be adjusted during manufacturing Adjustment)
Ambient temperature: Maximum temperature: +55℃
Minimum temperature: -40℃
The average temperature within 24 hours does not exceed 35℃
Ambient humidity:The average relative humidity for 24 hours does not exceed 95%
The average monthly relative humidity does not exceed 90%
Installation environment: There are no explosive and corrosive gases in the surrounding air, and there is no severe vibration or impact in the installation site. The pollution level does not exceed Level III in GB/T5582
Note: When the above usage environment conditions are exceeded, please contact us
