Product details

PRODUCT DESCRIPTION:

The GJH7-12 environmentally friendly gas ring network switchgear is an environmentally friendly switchgear independently developed by our 

company based on the development trend of the power industry and years of experience in on-site service and design construction of distribution 

networks. We aim to provide high-quality and environmentally friendly products for China's distribution networks by digesting and absorbing 

advanced technologies and design concepts at home and abroad. This product has excellent performance, including reasonable design, reliable 

power supply, compact structure, easy installation, flexible operation, small size, and high cost-effectiveness. It is suitable for three-phase AC 50Hz 

rated voltage 12kV distribution systems; Especially suitable for receiving and distributing electrical energy in small secondary distribution stations, 

switch stations, industrial and mining enterprises, urban residential areas, airports, railways, tunnels, high-rise buildings and other power systems.

Suitable locations: Distribution stations and box type switch stations in load centers such as smart grids, urban power distribution, buildings, and 

industrial enterprises.

Technical features: Adhering to the design concept of green and environmental protection in terms of concepts and ideas.

Market prospects: The lack or shortage of SF6 switchgear is the future technological development trend.

NORMAL USE CONDITIONS:

Surrounding air temperature: upper limit+40 ℃ , lower limit -40 ℃

Humidity: The daily average relative humidity should not exceed 95%; The monthly average is not greater than 90%.

Water vapor pressure: daily average not exceeding 2.2kPa; The monthly average value is not greater than 1.8kPa;

The altitude shall not exceed 2000m.

The surrounding air is not significantly polluted by dust, smoke, corrosive and flammable gases, vapors, or salt spray.

The amplitude of electromagnetic interference induced in the secondary system shall not exceed 1.6kV.

THE MAIN TECHNICAL PARAMETERS:

Structural characteristics of GJH7-12 environmental gas ring network switchgear:

Independent enclosed gas box structure

All medium voltage live parts are installed in a completely enclosed stainless steel enclosure with a protection level of IP67, ensuring the personal 

safety of operators; Not affected by small animals, corrosive gases, humidity, condensation, dust, and sun exposure, it does not rust or have eddy 

currents (the box material is 304 stainless steel).

1. Dry air insulation

The use of dry air as the insulation medium product is more environmentally friendly and eliminates the use of SF6 gas and its pollution to the 

environment. The medium voltage part inside the gas box adopts a composite insulation structure, which is compact, small in size, safe, reliable, and 

practical.

2. Design of small vacuum arc extinguishing chamber

The design of the vacuum arc extinguishing chamber structure, which uses vacuum as the extinguishing medium for miniaturization and low contact 

pressure, reduces the closing output power of the operating mechanism, improves the operational reliability and mechanical life of the switchgear, 

and truly achieves 10000 maintenance free cycles.

3. High personal safety

The switchgear adopts a fully insulated and fully sealed structure design, with a box protection level of IP4X and a medium voltage live part protection 

level of IP67. The switchgear and transmission cables are connected by touchable full screen shielded plug-in cable heads, with reliable pressure 

release devices and mechanical and electrical "five prevention" interlocks. The human-machine operation interface is intact to prevent misoperation 

and ensure the personal safety of operators.

4. Spacious cable connection room

The cable connection room has a large connection space and is suitable for parallel cable connections and additional lightning arrester cable 

connection plugs. At the same height, cables can be installed in parallel. The center distance of the cable outlet sleeve from the bottom of the box is 

650mm.

5. Flexible expansion methods

Top or side mounted electrical connectors can be designed between each functional unit to reliably connect with other functional units for easy 

expansion.

6. Each functional unit can be designed as a modular or shared box, with a maximum of 4 units shared in a box.

The shell, air box, pressure release device, and operating mechanism of the ring main unit have the following advantages:

1. Shell

The overall structure is designed with bolted connections using high-quality steel plates or aluminum zinc coated steel plates.

The upper part of the shell is the secondary instrument compartment, the middle part is the switch operating mechanism compartment, and the 

lower part is the cable compartment; The lower part of the cable room has a cable inlet sealed bottom sealing plate. The cable room door is a pull type 

operation that is simple and convenient, and is equipped with mechanical interlocking with a switch operating mechanism.

2. Gas box

The switch operating mechanism, gas pressure gauge, cable inlet and outlet conduit, and pressure relief device are arranged on the gas box by welding 

and processing high-quality 304 stainless steel plates.

3. Pressure relief device

The pressure release device is installed at the bottom of the gas box. When the pressure inside the gas box rises abnormally beyond the predetermined 

value, the pressure release device will activate to release the pressure and prevent the expansion of accidents, protecting the safety of personnel and 

equipment.

4. Operating mechanism

The operating mechanism is installed in the compartment outside the switch chamber, and the isolation switch and grounding switch use 

independent three position operating mechanisms; Install mechanical interlocking between two operating hand holes to prevent misoperation.