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Method and device for evaluating aging degree of transformer oil and sensing system

A transformer oil aging degree technology, applied in the field of transformer oil, can solve the problems that the aging degree of transformer oil cannot be reflected in time, the information is single, and it is difficult to accurately judge the aging degree of transformer oil.

Pending Publication Date: 2022-07-08
GUANGDONG POWER GRID CO LTD +1
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  • Abstract
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  • Claims
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Problems solved by technology

This method cannot be tested in real time when the equipment is running online, so it often cannot reflect the aging degree of transformer oil in time
At present, the information obtained by the existing online tester is single, and it can only be tested under the condition of a single frequency conductivity, so it is difficult to accurately judge the aging degree of transformer oil

Method used

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  • Method and device for evaluating aging degree of transformer oil and sensing system
  • Method and device for evaluating aging degree of transformer oil and sensing system
  • Method and device for evaluating aging degree of transformer oil and sensing system

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Embodiment 1

[0045] Please refer to figure 1 , figure 1 A method for evaluating the aging degree of transformer oil provided in an embodiment of the present invention includes steps S1 to S4; wherein,

[0046] In step S1, the polarization current and non-polarization current of the transformer oil under the DC voltage are collected in real time, respectively, and the polarization curve and the non-polarization curve of the transformer oil under the DC voltage are recorded according to the collected polarization current and non-polarization current. ; wherein, the polarization curve is the curve of the polarization current of the transformer oil changing with time; the non-polarization curve is the curve of the non-polarization current of the transformer oil changing with time.

[0047] In this embodiment, a DC voltage U is applied to the conductance electrodes at both ends 0 , real-time acquisition of polarized current and non-polarized current of transformer oil at this time. With the ...

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Abstract

The embodiment of the invention provides a transformer oil aging degree evaluation method, a transformer oil aging degree evaluation device and a sensing system. The transformer oil aging degree evaluation method comprises the following steps: recording a polarization curve and a non-polarization curve of transformer oil under direct-current voltage; collecting no less than one voltage effective value and no less than one current effective value of the transformer oil under the alternating current excitation signal; calculating the first conductivity of the transformer oil by combining the capacitance of the conductivity electrodes at the two ends of the transformer oil; calculating at least one second conductivity according to the voltage effective value and the current effective value; and obtaining the infrared light absorptivity of each aging product, and calculating the aging index of the transformer oil by combining the first conductivity and at least one second conductivity to obtain the aging degree evaluation result of the transformer oil. Compared with the prior art, online testing can be carried out, the influence of impurities on the conductivity of the transformer oil is considered by obtaining no less than one conductivity of the transformer oil under the direct-current voltage and the alternating-current voltage, and the accuracy and the real-time performance of testing are improved.

Description

technical field [0001] The invention relates to the field of transformer oil, in particular to a method, device and sensing system for evaluating the aging degree of transformer oil. Background technique [0002] Transformer oil is a refined mineral insulating oil based on petroleum products, and its main components include alkanes, naphthenes and aromatic hydrocarbons. Transformer oil is the main liquid insulating medium used for insulation, cooling and arc extinguishing in power equipment. With the passage of the equipment running time, the transformer oil will appear oxidation aging and other phenomena, and generate aging products such as free radicals, alcohols, aldehydes and ketones, which seriously affect the insulation performance of the transformer oil. [0003] At present, the evaluation method of the aging degree of transformer oil is mainly to take out the transformer oil, place it in a constant temperature drying box, heat it to a temperature 10 degrees Celsius ...

Claims

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Application Information

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IPC IPC(8): G01N27/06G01N21/3577
CPCG01N27/06G01N21/3577Y04S10/50
Inventor 钱艺华王青赵耀洪李智盘思伟付强林木松彭磊
Owner GUANGDONG POWER GRID CO LTD
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