22kv Gas Insulated Switchgear（Ring Main Unit SF6)

22kv Gas Insulated Switchgear Introduction

- Fill the gas box with SF6 vapor and undergo synchronous vacuum packaging for leak detection; The high-voltage load switch, grounding device power switch, circuit breaker insulation layer cylinder and other power switch themed movable components, as well as the bus duct, are sealed in a stainless steel plate air box. The waterproof level of the air hood is P67, and the dust collector is equipped with a glass diaphragm. When the internal pressure of the power switch exceeds a certain working pressure, it can be discharged from the explosion-proof port below, which can reasonably avoid harm to people, cables, and other switchgear in the distribution station.

1. What is the rated voltage and current of the 22kV GIS?
   The standard rated voltage is 22kV, with a typical current rating ranging from 630A to 2500A, depending on the design and application.

2. What type of gas is used for insulation in the GIS?
   Sulfur hexafluoride (SF6) gas is commonly used due to its excellent insulating and arc-quenching properties.

3. What are the key advantages of 22kV GIS over air-insulated switchgear?
   GIS offers a compact design, higher reliability, minimal maintenance, and better resistance to environmental factors like dust, moisture, and pollution.

4. Is the 22kV GIS suitable for indoor and outdoor installation?
   Yes, it can be installed both indoors and outdoors, but proper ventilation and housing may be required for outdoor use.

5. What safety features are included in the 22kV GIS?
   It includes features such as pressure monitoring, gas leakage detection, fault indicators, and interlocking mechanisms to prevent unsafe operations.

6. How often should maintenance be performed on 22kV GIS?
   Routine inspections are recommended every 3-5 years, with detailed maintenance (e.g., gas quality checks, contact resistance tests) as per manufacturer guidelines.

7. What is the expected lifespan of a 22kV GIS system?
   With proper maintenance, the lifespan typically exceeds 30 years.

8. Can the 22kV GIS be integrated with digital monitoring systems?
   Yes, modern GIS units support SCADA integration for real-time monitoring of gas pressure, temperature, and circuit status.

9. What are the environmental concerns related to SF6 gas?
   SF6 is a potent greenhouse gas, so proper handling, recycling, and leak prevention measures are essential to minimize environmental impact.

10. What are the common failure modes of 22kV GIS, and how can they be prevented?
    Common issues include gas leaks, contact degradation, and insulation failure. Regular testing, proper installation, and adherence to operational limits help prevent failures.