All-in-one sensing device for monitoring transformer bushing tap

Abstract

The invention provides an all-in-one sensing device for monitoring an end screen of a transformer bushing, and the device comprises an end screen lead device which is connected with a grounding wire of the bushing through an installation support and leads out the grounding wire; the sensor assembly is arranged on the mounting bracket, is connected with the oil taking opening of the sleeve and is used for detecting and uploading the temperature, the pressure, the partial discharge current and the hydrogen content of the sleeve; the power supply module is arranged on the mounting bracket, takes electricity through coil induction and supplies power to the sensor assembly; the output end of the end screen lead wire device is connected with the power supply module, and the output end of the power supply module is connected with the sensor assembly. Pressure, temperature, hydrogen content, dielectric loss, UHF and HFCT signals of a transformer bushing are acquired, coil induction power taking is performed through the power module, an end screen lead wire device leads out an end screen lead-out grounding wire and sends the end screen lead-out grounding wire to the power module for detection and power taking, the end screen lead-out grounding wire is converted into voltage and current required by a sensor assembly through the power module, installation and detection are convenient, and the detection efficiency is improved. Maintenance is reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of substation operation and maintenance, in particular to an all-in-one sensing device used for monitoring the end screen of a transformer bushing. Background technique [0002] 110kV and above main transformer outlet mode mainly adopts capacitive bushing, and the casing end screen is an important signal pickup position to detect the main transformer partial discharge, dielectric loss and other parameters. [0003] With the steady progress of power grid engineering construction, Xinjiang power grid has higher and higher requirements for the transparency of UHV electrical equipment, and the use of online monitoring devices for electrical equipment with low power consumption and miniaturization with wireless IoT functions is increasing. [0004] The wired transmission current conversion sensor used in the oil-impregnated paper insulating sleeve has a large number of interfaces, low safety and reliability, and ...

AI Technical Summary

Problems solved by technology

[0004] The wired transmission type current conversion sensor used in the oil-impregnated paper insulating bushing has a large number of interfaces, low safety and reliability, and it is impossible to open the protective cover at the end of the bushing when the main transformer is running. The existing method is to lead the grounding wire of the end screen of the bushing to the bottom, but this changes the grounding method to a certain extent, and poses a certain risk to safe operation.

[0005] The existing improvement to the above-mentioned technology is to set the end screen lead device, without changing the electrical characteristics of the original bushing end screen, to extract partial discharge and grounding current signals from the end screen of the bushing. At that time, the existing end screen lead device Using wired transmission, the installation structure is complicated, the safety and reliability are low, and external power supply or charging is required, the installation and maintenance are very inconvenient, and the wired connection is used, the wiring project is huge, and the work efficiency is reduced.

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