An Improved Moisture Evaluation Method for Transformer Insulating Paper
A technology for insulating paper and transformers, applied in the field of improved moisture evaluation of transformer insulating paper, can solve the problems of inability to distinguish moisture and aging effects, lack of field data verification, moisture error of insulating paper, etc., and achieves low cost, simple detection method, sampling handy effect
Inactive Publication Date: 2017-10-03
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Problems solved by technology
The moisture balance curve of the aging oil-paper insulation system is significantly different from the moisture balance curve of the insulation system composed of new oil and new paper, so using the Oommen curve to evaluate the moisture content of the insulating paper of the aging transformer will cause a large error
The dielectric response method is to evaluate the moisture content of the insulating paper based on the dielectric properties of the oil-paper insulation system. This method has the following defects: 1) The current dielectric response method cannot distinguish the influence of moisture and aging on the dielectric response curve; 2) Some dielectric response methods are susceptible to interference when applied to field transformers; 3) The current dielectric response methods are mainly based on laboratory data, and there is still a lack of field data verification
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[0018] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
[0019] Such as figure 1 As shown, the method of the present invention comprises the following steps: 1) establish a furfural-polymerization degree equation, detect the furfural content in the insulating oil, substitute it into the furfural-polymerization degree equation, obtain the insulation paper polymerization degree value, and evaluate the transformer Aging state of the insulation system; 2) Detect the temperature of the transformer and the moisture content in the insulating oil; 3) Construct the moisture balance curve of the oil-paper insulation system at different temperatures and different aging states, according to the degree of polymerization of the insulating paper obtained in step 1 and the obtained in step 2 Transformer temperature, select the appropriate moisture balance curve of the oil-paper insulation system; 4) Substitute t...
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The invention discloses an improved transformer insulation paper moisture assessment method. The method mainly comprises operation steps as follows: detecting the content of furfural in transformer oil, and assessing aging of transformer insulation paper on the basis of a furfural-polymerization degree equation; detecting the content of moisture in the insulation oil; selecting a proper improved oil-paper insulation moisture equilibrium curve according to the aging condition of the insulation paper; assessing the content of moisture in the insulation paper according to the content of moisture in the oil. According to the method, the influence of aging on the oil-paper insulation moisture equilibrium curve is considered into insulation paper moisture assessment for the first time, and the accuracy of assessment of moisture of transformers in different aging states can be improved. Meanwhile, online sampling of the transformers can be realized with the method, and the sampling method is simple, is not influenced by field electromagnetic interference of the transformers and has the popularization potential.
Description
technical field [0001] The invention belongs to the field of transformer insulating paper aging evaluation, and in particular relates to an improved method for evaluating the moisture content of transformer insulating paper. Background technique [0002] The transformer is the most critical and expensive core component of the power system. The reliable operation of the power grid requires the transformer to be able to operate safely for a long time. The remaining life of a transformer mainly depends on the aging state of its insulation system. The insulating oil can be replaced with new oil after aging, but it is difficult to replace the insulating paper after aging, so the service life of the insulating paper directly determines the service life of the transformer. [0003] The moisture in the insulating paper will greatly accelerate the aging of the insulating paper: for every 0.5% increase in the moisture content of the paper, the life of the insulating paper will be cut...
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IPC IPC(8): G01N33/00
CPCG01N33/00G01N2033/0088
Inventor 朱孟兆赵学童陈玉峰林元棣杨丽君廖瑞金高竣
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY