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Quantification estimation method of oil-paper insulation states of transformer

A transformer oil, quantitative evaluation technology, applied in the direction of measuring electrical variables, instruments, measuring devices, etc., can solve the problems of staying in the analysis level of traditional parameter change rules, and achieve the effect of effective evaluation

Inactive Publication Date: 2018-05-01
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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  • Abstract
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Problems solved by technology

However, at present, in the application of dielectric response technology diagnosis research in our country, it is still at the analysis level of the traditional parameter change law, and more in-depth research needs to be carried out.

Method used

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  • Quantification estimation method of oil-paper insulation states of transformer
  • Quantification estimation method of oil-paper insulation states of transformer
  • Quantification estimation method of oil-paper insulation states of transformer

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Embodiment Construction

[0031] The technical solutions in the present invention are clearly and completely described below in combination with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0032] Such as figure 1 As shown, a kind of quantitative evaluation method of transformer oil-paper insulation state provided by the present invention comprises the following steps:

[0033] (1) The frequency-domain dielectric spectrum circuit is used to collect the frequency-domain dielectric spectrum of the on-site operating transformer, and the frequency-domain spectrum of the complex permittivity of the oil-paper insulation system of the transformer is determined.

[003...

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Abstract

The invention discloses a quantification estimation method of oil-paper insulation states of a transformer and relates to the technical field of fault diagnosis of transformers. According to the invention, based on a transformer X model, the complex capacitivity, the complex relative dielectric constant and the change rule of relative frequency of medium loss values of a to-be-tested device are tested; frequency domain dielectric fingerprints which reflect insulation aging states of the transformer are extracted; and according to the frequency domain dielectric fingerprints, the insulation aging states of the transformer are effectively estimated. Thus, effective estimation of the insulation aging states of old transformers is achieved; financial loss caused by change of the transformer isavoided; and fault probability caused by the insulation aging is avoided.

Description

technical field [0001] The invention belongs to the technical field of transformer fault diagnosis, in particular to a method for quantitatively evaluating the insulation state of transformer oil paper. Background technique [0002] Oil-paper insulation is the main insulation of power transformers. Accurate evaluation of its aging state is of great engineering significance for the realization of condition-based maintenance of transformers. Existing data have shown that the service life of insulating oil is not a key factor in determining the service life of transformers, but the service life of insulating paper / cardboard determines the service life of transformers. A large number of research results have proved that the aging of insulation will only directly lead to the decline of the mechanical properties of transformer oil-paper insulation, while the electrical properties such as power frequency dielectric loss, power frequency or impact breakdown voltage will not change m...

Claims

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Application Information

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IPC IPC(8): G01R31/12G01R27/26
Inventor 张玉波吴秋莉黎大健赵坚颜海俊苏星华蒲金雨陈梁远张磊余长厅
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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