How does the safety design of the gas-filled ring main unit deal with sudden failures?

Publish Time: 2025-02-19

The safety design of the gas-filled ring main unit mainly depends on its structural design, insulation medium selection, operating mechanism setting, fault warning and emergency handling mechanism and other aspects when dealing with sudden failures.

1. Structural design

Metal fully enclosed structure: The gas-filled ring main unit usually adopts a metal fully enclosed structure, which is assembled by bending steel plates and tightening screws to ensure the durability of the equipment. This structure can effectively prevent external factors (such as moisture, dust, small animals, etc.) from damaging the inside of the equipment, thereby improving the safety of the equipment.

Internal isolation and protection: Isolation measures are set between the internal components of the equipment to prevent the expansion of the fault range when faults such as arcs and short circuits occur. At the same time, special protection is provided for components that may generate arcs, such as the use of arc extinguishing chambers, to reduce the destructive power of arcs on equipment.

2. Insulation medium selection

SF6 gas: SF6 gas has excellent insulation performance and stability, which can effectively prevent arcs and corona discharges and ensure the reliable operation of the ring network cabinet. At the same time, SF6 gas also has good arc extinguishing performance, which can quickly cut off the arc when a fault occurs and prevent the fault from expanding.

Environmentally friendly gas: With the improvement of environmental awareness, more and more gas-filled ring main units have begun to use environmentally friendly gases (such as dry air, nitrogen, etc.) as insulating media. These gases also have good insulation properties and have little impact on the environment.

3. Operating mechanism setting

Load switch design: The load switch adopts a gas-generating design, which is oil-free and non-toxic and easy to operate. At the same time, it is equipped with manual or electric operating mechanisms to meet different operating requirements. This design enables operators to operate the equipment quickly and accurately in an emergency.

Interlocking function: The gas-filled ring main unit usually has an interlocking function to ensure that dangerous operations cannot be performed when the equipment is not in a safe state. For example, when the grounding switch is in the closed state, the load switch cannot be operated; when the circuit breaker is in the closed state, the cable side grounding switch cannot be operated. These interlocking measures effectively prevent faults caused by misoperation.

4. Fault warning and emergency response mechanism

Fault indicator light and alarm device: The gas-filled ring main unit is equipped with a fault indicator light and an alarm device. When the equipment fails, the indicator light will light up and send an alarm signal to remind the operator to take timely measures.

Emergency response plan: Develop a detailed emergency response plan, including the responsibilities and operating procedures of each link such as emergency command, emergency team, technical support, and communication. When a sudden failure occurs, the plan can be quickly activated and emergency repair personnel can be organized to rush to the scene to troubleshoot and repair the fault.

Regular inspection and maintenance: Regularly inspect and maintain the gas-filled ring main unit, including checking whether the insulation performance, switch operating mechanism, interlocking function, etc. are normal; measuring whether the SF6 gas pressure is within the normal range; cleaning the dust and debris inside the equipment, etc. These measures help to timely discover and eliminate potential safety hazards.

In summary, the safety design of the gas-filled ring main unit ensures the reliability and safety of the equipment through comprehensive measures in multiple aspects such as structural design, insulation medium selection, operating mechanism setting, and fault warning and emergency response mechanism when dealing with sudden failures.