Gas low temperature electrical characteristics test device

Abstract

The invention belongs to the technical field of high voltage and insulation, and in particular relates to a low-temperature electrical characteristics testing device for air. The device mainly comprises a testing chamber, a vacuum pumping device, an air charging device, a cold source copper tube, a hot source copper wire, a temperature monitoring device and a heat insulation chamber which are connected according to the relation that the cold source copper tube and the heat source copper wire closely coil the testing chamber and integrally arranged in the heat insulation chamber; the testing chamber is connected with the vacuum pumping device and the air charging device; the heat source copper wire is connected with the temperature monitoring device; the vacuum pumping device is used for pumping vacuum for the testing chamber in order to prepare for charging the tested air into the testing chamber; the air charging device is used for charging the tested air into the testing chamber; the cold source copper tube is used for cooling the testing chamber; the heat source copper wire supplies heat to the testing chamber to enable adjustable temperature of the testing chamber; the temperature monitoring device controls the heat of the heat source copper wire so as to control and stable the temperature of the testing chamber; the heat insulation chamber comprises two vacuum chambers which can insulate the heat exchange between the testing chamber and the outside, and therefore, the cooling efficiency is increased. According to the device, a test platform is provided for testing the electrical characteristics in a common cold temperature area in which air is at the temperature from -153 to -30 DEG C.

Description

technical field [0001] The invention belongs to the technical field of high voltage and insulation, in particular to a gas low-temperature electrical characteristic testing device. Background technique [0002] SF 6 Gas is currently the most ideal insulation and arc extinguishing medium, and it is widely used in the insulation of power equipment. But SF 6 It is a heavy gas with a large molecular weight, and its liquefaction temperature is higher than that of ordinary gases. It is easy to liquefy under high pressure and low temperature environment, so SF 6 Gas is not suitable for use in alpine regions. Solve the alpine area SF 6 For this problem of gas, the method that has been used is to add common gases such as N2, CO2 or air to SF6 to form a binary mixed gas. [0003] On the other hand, SF6 is a strong greenhouse gas, and the search for alternative gases to SF6 has become a research hotspot at home and abroad. In refrigeration and cryogenic engineering, the general c...

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Problems solved by technology

At present, the research on SF6 substitute gas is mainly under the condition of above -30°C, and the liquefaction temperature of the found substitute gases with good performance (such as c-C4F8, CF3I) is even higher than that of SF6 gas, and due to the temperature factor itself It will also affect the gas insulation performance. Therefore, the research results are not applicable in the general cold temperature range of -153°C to -30°C.

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