Fitting algorithm for moisture content of oil paper insulation system

Abstract

The invention discloses a fitting algorithm for the moisture content of an oil paper insulation system and relates to the field of fitting algorithms for the moisture content rate of oil paper insulation systems. An effective numerical calculation algorithm is provided for assessment of the moisture content rate of the oil paper insulation system. According to an oil paper insulation frequency domain dielectric spectrum quantification calculation formula and a parallel-connection coefficient, a frequency domain dielectric spectrum of insulation of aged or damp oil paper is calculated and fitted with an actual-measurement frequency domain dielectric spectrum to obtain the moisture content of the insulation system of oil paper to be tested; the moisture content of an insulation paper plate in the oil paper insulation system is quantitatively diagnosed, and meanwhile oil paper insulation databases different in temperature and different in moisture content do not need to be established through a large number of experiments; the fitting algorithm can be applied to a power transformer and electric equipment which adopts the oil paper insulation system as main insulation.

Description

Technical field: [0001] The invention relates to a moisture content fitting algorithm of an oil-paper insulation system, which relates to the field of moisture content fitting algorithms of an oil-paper insulation system. Background technique: [0002] The power transformer is one of the important equipment in the operation of the power grid. Its safe and stable operation is an important guarantee for the safety and reliability of the power supply; oil-paper insulation is the main insulation form of the power transformer. The entry of external moisture will greatly increase the moisture content of the oil-paper insulation and accelerate the insulation. Aging will weaken the insulation performance; therefore, the moisture content of insulating cardboard can be regarded as one of the important indicators for evaluating the aging state of insulation. The study of moisture content is of great significance to the safe operation of transformers. [0003] The traditional moisture c...

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Problems solved by technology

[0003] The traditional moisture content detection method is the hanging core sampling detection, that is, the Karl Fischer titration method is used to measure the moisture content. This method has good accuracy, but the sampling needs to cut the insulation system, which is a destructive test and the operation is complicated. , the possibility of being used for on-site detection is very small; at this stage, the non-destructive diagnostic method represented by the dielectric response technology is widely used in the research on the evaluation of the aging state of transformer oil-paper insulation. This method can provide accurate and valuable references. And the feature of no hanging core undoubtedly provides a better way for on-site testing

[0004] In recent years, some oil-paper insulation moisture content detectors based on dielectric response technology have also appeared on the market. For example, DIRANA (dielectric response analyzer) developed by M. Koch mainly combines field measured data with a large number of experiments. The database is compared to realize the quantitative evaluation of the moisture content of the main insulation of the transformer and the conductivity of the insulating oil. The IDAX series insulation diagnostic analyzer developed by Megger can fit the moisture content of the insulating cardboard in the transformer according to its own software, but its evaluation method and The principle is also based on database comparison. In China, the evaluation of moisture content of transformer cardboard is limited to the stage of finding characteristic quantities through experiments, and no effective calculation method has been formed for engineering practice.

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