Micro water transmitter for high-voltage switch gas insulated switchgear (GIS) distribution room

Abstract

The invention belongs to the field of transmitters, and in particular relates to a micro water transmitter for a high-voltage switch gas insulated switchgear (GIS) distribution room. The transmitter comprises a body (1), and a connecting piece (3), a sensor bracket (5), a sensor seat (6), a dew point sensor, a pressure sensor, a temperature sensor, a pressure voltage / current (V / I) conversion module and a temperature conversion module which are arranged in the body (1), wherein the top of the sensor bracket (5) is fixedly connected with the bottom of the sensor seat (6); the main body of the dew point sensor is packaged in the sensor seat (6), and the probe part of the dew point sensor is arranged in the inner cavity of the body (1); the top of the sensor seat (6) is provided with a pressure sensor assembling groove for assembling the pressure sensor; the side wall of the pressure sensor assembling groove is provided with a through hole; and the output port of the connecting piece (3) is communicated with the inner cavity of the body (1). The transmitter has high sealing property, insulating property, anti-interference property and response speed.

Description

technical field [0001] The invention belongs to the field of transmitters, in particular to a micro-water transmitter for a high-voltage switch GIS power distribution room. Background technique [0002] High-voltage switch is one of the important equipment in power plants and substations. In order to safely and reliably send power to the national grid, it is necessary to ensure that high-voltage switches and other equipment work normally and reliably. In high-voltage switch GIS equipment, the density of SF6 shielding gas and trace moisture content play a crucial role in whether the high-voltage switch can operate reliably. wear; due to the decline in insulation capacity, partial discharge occurs near the electrodes at both ends, which leads to penetrating flashover after a long time; directly affects the breaking performance of the high-voltage switch. Therefore, real-time detection of the density and trace moisture content of SF6 gas in the high-voltage switchgear GIS equi...

AI Technical Summary

Problems solved by technology

[0003] In the measurement of the trace moisture content of SF6 gas, the traditional method often uses a portable micro-water measuring instrument. The disadvantage is that the portable micro-water measuring instrument cannot perform online real-time measurement of the trace moisture content of SF6 gas, and can only measure the micro-water content regularly. , when measuring the micro-water content, it is necessary to release a part of SF6 gas from the gas chamber. Generally, the measurement time is required to be 5 to 10 minutes, and the gas release flow rate is 5L / min. Each test brings a large amount of gas release. Test The process is relatively complicated and inconvenient to operate, and for SF6 switches with small gas chambers, this method cannot be used for detection

At the same time, since a part of the SF6 gas is released from the gas chamber, the density of the SF6 gas in the gas chamber will decrease, so the SF6 gas chamber must be supplemented with gas, which will affect the micro-water content in the SF6 gas chamber, which will bring a greater impact to the measurement. error

[0004] At present, some micro-water transmitters that can detect online have also appeared on the market, mainly using the principle of humidity sensors, with poor accuracy and no temperature compensation, which cannot meet the accuracy requirements for the detection of micro-moisture content of high-voltage switches in power system GIS; The structure of the transmitter only adopts the connection method of thread and rubber ring, and no special method is used, so the tightness of the transmitter cannot be guaranteed, and for the high-voltage switch detection instrument, the tightness of the transmitter is very important ;The pressure sensor and humidity sensor that make up the micro-water transmitter are directly welded to the shell of the micro-water transmitter. There is no insulation between the sensor and the transmitter shell, and the use site of the micro-water transmitter is In the 220KV or 500KV ultra-high voltage environment, there are various electromagnetic interference and static electricity on site. The electromagnetic interference and static electricity in the field environment can directly affect the sensor through the transmitter shell, thereby damaging the sensor.

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