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Transformer bushing damp state evaluation method based on high-voltage frequency domain dielectric spectrum

A technology of transformer bushing and frequency domain dielectric spectrum, which is applied in the direction of measuring electrical variables, testing dielectric strength, instruments, etc., and can solve the problems that cannot be diagnosed quantitatively, but can only be diagnosed qualitatively

Pending Publication Date: 2021-05-11
GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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Problems solved by technology

[0008] This application provides a method for evaluating the damp state of transformer bushings based on high-voltage frequency domain dielectric spectrum, which is used to solve the technical problem that the prior art can only qualitatively diagnose the damp state of oil-paper insulating bushings, but cannot quantitatively diagnose

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  • Transformer bushing damp state evaluation method based on high-voltage frequency domain dielectric spectrum
  • Transformer bushing damp state evaluation method based on high-voltage frequency domain dielectric spectrum
  • Transformer bushing damp state evaluation method based on high-voltage frequency domain dielectric spectrum

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Embodiment 1

[0051] In this embodiment, the frequency domain dielectric spectrum test is carried out at room temperature for the suspected damp bushing A, the normal bushing C and the newly shipped bushing Z with a voltage level of 500kV, and the real part of the complex capacitance of the three bushings is measured in the frequency domain graph as Figure 4 shown by Figure 4 Obtain the real part ratios of the complex capacitances of the three bushings at the frequency points of 1mHz and 10kHz respectively, such as Figure 5 Shown is the comparison chart of the real part ratio of the complex capacitance of the three bushings. Depend on Figure 5 It can be concluded that the real part ratio of the complex capacitance of the normal bushing C and the newly shipped bushing Z is close to 1, while the real part ratio of the complex capacitance of the suspected damp bushing A is 1.5, indicating that the moisture content of the A bushing is slightly higher than that of the C bushing. Tubes and...

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Abstract

The invention discloses a transformer bushing damp state evaluation method based on a high-voltage frequency domain dielectric spectrum, and the method can achieve the quantitative evaluation of the average water content of a transformer bushing through building a quantitative diagnosis model between the ratio of the real parts of complex capacitors with the frequency points of 1mHz and 10kHz, and the average water content. Therefore, the technical problem that the damp state of the oil paper insulation sleeve can only be diagnosed qualitatively but cannot be diagnosed quantitatively is solved, the reliability of damp state evaluation is improved, meanwhile, the error influence of the geometric dimension of the transformer sleeve on damp state evaluation is avoided, and the accuracy is improved.

Description

technical field [0001] The present application relates to the technical field of transformer bushing detection, in particular to a method for evaluating the wet state of transformer bushings based on high-voltage frequency-domain dielectric spectrum. Background technique [0002] Energy and electricity are the foundation of economic and social development, and safe, efficient, and clean electricity supply is an important guarantee for my country's modernization development process. With the continuous growth of power load demand, the large-scale construction of UHV power grid has put forward higher requirements for the insulation level of key equipment for power transmission and transformation. [0003] Oil-impregnated paper bushings (hereinafter referred to as bushings) are key equipment widely used in power transformer outlets or wires through walls, and are the first trial-produced insulation structures for the development of ultra-high voltage power systems. With the im...

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Application Information

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IPC IPC(8): G01R31/12G01N27/22
CPCG01R31/1245G01N27/221G01N27/223
Inventor 石泉卢启付冉旺汤龙华肖磊石邓威徐闻婕陈元
Owner GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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