Treatment process aiming at moisture standard exceeding in SF6 device

Abstract

The invention relates to a treatment process aiming at moisture standard exceeding in an SF6 device. The process comprises: before nitrogen inflation for flushing the SF6 device, heating nitrogen to 98-102 DEG C through a gas temperature control system; inflating nitrogen into the SF6 device for flushing for 30 min; discharging nitrogen through a vacuum duct after flushing; performing flushing twice; inflating SF6 gas into the SF6 device; performing an air-pressure-and-moisture test; and inflating SF6 gas into the SF6 device till a rated pressure is reached. Through the process, time of nitrogen standing in the SF6 device is effectively shortened, and flushing times with nitrogen during the flushing process is reduced, thereby improving the treatment effect and efficiency of moisture standard exceeding in the SF6 device. Through treatment of moisture standard exceeding, the moisture content in coil devices can be effectively inhibited from rebounding.

Description

technical field [0001] The present invention relates to a method for SF 6 The treatment process for equipment micro-water exceeding the standard belongs to the technical field of power grid equipment maintenance. Background technique [0002] Currently, SF 6 The equipment is widely used in the power grid, and the pure SF under normal conditions 6 The gas has good insulation performance and arc extinguishing performance, and when the moisture in the atmosphere invades the SF 6 SF 6 The moisture in the gas will increase. The consequent consequence is that the electrical strength of the gas is significantly reduced, especially in the gas chamber where the arc exists in the circuit breaker, the SF 6 The gas will produce physical and chemical reactions under the joint action of the arc and moisture, and finally generate highly corrosive hydrofluoric acid, sulfuric acid and other highly toxic chemical substances, etc., which will corrode the insulating material or metal mater...

AI Technical Summary

Problems solved by technology

The consequent consequence is that the electrical strength of the gas is significantly reduced, especially in the gas chamber where the arc exists in the circuit breaker, the SF 6 The gas will produce physical and chemical reactions under the joint action of the arc and moisture, and finally generate highly corrosive hydrofluoric acid, sulfuric acid and other highly toxic chemical substances, etc., which will corrode the insulating material or metal material of the circuit breaker and make the insulation deterioration

In addition, when the micro-water seriously exceeds the standard, it may also cause the conductor to discharge to the cylinder wall, and the surface flashover on the inner side of the cylinder wall

If it is not dealt with in time, it will lead to electrical accidents and affect the normal and stable operation of the power system.

[0003] Traditional SF 6 The operation process of the micro water exceeding the standard treatment process of the equipment is complicated and time-consuming, and the high-purity N 2 When flushing the inside of the equipment, it is necessary to fill the air chamber of the equipment with high-purity nitrogen (N 2 Purity 99.999%), nitrogen pressure should be close to SF 6 Rated pressure, need to stand still for 1 hour after nitrogen filling, and then use a special vacuum catheter to discharge nitrogen, repeat vacuuming and nitrogen filling three times before proceeding to the next step

For equipment with a large air chamber, it will take a long time to complete this link, which will seriously affect the progress of the entire work

Moreover, the traditional process does not have a good treatment effect on coil equipment such as current transformers and voltage transformers, and the micro-water content in the equipment will rebound soon after treatment.

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