On-line sampling system for sulfur hexafluoride gas

Abstract

The invention relates to the technical field of on-line monitoring equipment of electrical equipment gas, particularly to an online sampling system of sulfur hexafluoride gas. The online sampling system comprises a channel selection module including one or more groups of gas circuit branches; the channel selection module is connected with an air inlet pipeline; a pressure reduction device, a sampling electromagnetic valve, a detector pressure detection device and a detection electromagnetic valve are sequentially arranged on the air inlet pipeline; the air inlet pipeline is connected with a detector inlet; a detector outlet is connected with a sampling cylinder through a gas outlet pipeline; and the sampling cylinder connected with an electric push rod connected with a sampling motor. Theair outlet pipeline is connected with a buffer pipeline; the buffer pipeline is connected with a buffer tank; and a buffer pipeline is connected with a buffer electromagnetic valve. The air outlet pipeline is connected with a backflushing pipeline; a backflushing electromagnetic valve is arranged on the backflushing pipeline; the backflushing pipeline is connected with the channel selection module; and the channel selection module, the pressure reduction device, the sampling electromagnetic valve, the detector pressure detection device, the detection electromagnetic valve, a detector, the sampling motor, the buffer electromagnetic valve and the backflushing electromagnetic valve are all connected with a control system through electric signals. The online sampling system has advantages of optimized structure, rapidness, and high efficiency; and the detection precision is improved and various demands are satisfied.

Description

technical field [0001] The invention relates to the technical field of gas online monitoring equipment for electrical equipment, in particular to an online sampling system for sulfur hexafluoride gas. Background technique [0002] Sulfur hexafluoride (SF6) gas is mainly used in the power industry. SF6 gas is mainly used in the following electrical equipment as insulation and / or arc extinguishing: SF6 circuit breakers and GIS (here refers to sulfur hexafluoride closed combination electrical appliances), SF6 load switchgear, SF6 insulated transmission pipeline, SF6 transformer and SF6 insulated substation. Among them, 80% are used for high and medium voltage power equipment. [0003] The operating status of sulfur hexafluoride electrical equipment can be judged by monitoring the composition of sulfur hexafluoride gas. The existing technology, such as figure 1 As shown, the demand for online sampling monitoring can be realized, which specifically includes a cylinder 10, the c...

AI Technical Summary

Problems solved by technology

[0005] 1. When the piston of the cylinder is pushed to the top, there is a dead volume in the cylinder structure, and the pressure in the dead volume will affect the pressure of the detector, so that the pressure in the detector cannot be maintained at normal pressure;

[0006] 2. The sampling device in the prior art can only sample and monitor one sulfur hexafluoride electrical equipment, and one equipment is connected to a pipeline, and the efficiency is low;

[0007] 3. The pressure reducing valve in the prior art has a mechanical structure, and its precision is low, and the control mode of the pressure reducing valve is a single pressure value control, and it is impossible to set and adjust the set value

Images