Long-distance test apparatus for humidity of power electronic equipment

Abstract

The invention discloses a long-distance test apparatus for humidity of power electronic equipment. The test apparatus for humidity of power electronic equipment comprises a humidity sensing unit with an insulation sheath, a group of double-core shielded twisted pair, a multivibrator circuit, an optical coupling isolation processing circuit, an electro-optical conversion circuit, a transmission unit, a photoelectric switching circuit and a data collector; the humidity sensing unit is used for conversing the humidity of operation environment of the power electronic equipment to capacitance parameter CP, the multivibrator circuit is used for outputting a periodic square wave voltage signal according to the capacitance parameter CP for reflecting the operation environment humidity of the power electronic equipment obtained by twisted pair transmission; the photoelectric switching circuit is used for reducing a light square wave signal to the square wave electric signal; the data collector is used for performing real-time collection of the square wave electric signal, and the period of the voltage signal for reflecting the operation environment humidity of the power electronic equipment is obtained, and the operation environment humidity of the power electronic equipment can be obtained according to the period analysis of the voltage signal.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and more specifically relates to a device for remotely testing the humidity of power electronics equipment. Background technique [0002] At present, high-power power electronic devices represented by SCR (phase-controlled thyristor), IGBT (insulated gate bipolar transistor), and IGCT (integrated gate commutated thyristor) replace traditional vacuum switches, gas switches, and liquid switches to build large-scale Capacity power electronic equipment has been trending and mass-industrialized, which has greatly promoted the development of power electronic devices in the direction of high voltage, high current, large capacity, and full digitalization. [0003] When the power electronic device is working, if the heat dissipation is not timely or the heat dissipation measures are not appropriate, it will burn the device due to overheating, which greatly reduces the reliability of the device. ...

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Problems solved by technology

[0010] In view of the defects of the prior art, the purpose of the present invention is to provide a device for remotely testing the humidity of power electronic equipment, the purpose of which is to realize long-distance transmission in a strong electromagnetic field environment and reliably monitor the operating humidity of power electronic equipment to ensure equipment safety , healthy and reliable work; aiming to solve the technical problem that the humidity measuring device in the existing power electronic equipment is susceptible to strong electromagnetic interference during long-distance transmission

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