Method for assessing transformer oil-paper insulation aging state
An aging state, transformer oil technology, applied in the direction of testing dielectric strength, etc., can solve the problems of current curve fluctuation, unsmooth current curve, on-site noise interference, etc., to achieve the effect of smooth current curve and improved accuracy of judgment
Active Publication Date: 2013-09-04
STATE GRID CORP OF CHINA +1
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Problems solved by technology
It is very important to evaluate the aging state of transformer oil-paper insulation. However, with the increase of aging time, the detection of oil-paper insulation samples in transformers generally adopts PDC test technology. One of the shortcomings of PDC test technology is that it is extremely susceptible to field noise. Interference, so that the measured current curve fluctuates a lot, and the current curve is not smooth
Therefore, it affects the evaluation of the insulation state of the test object
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[0034] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings; it should be understood that the preferred embodiments are only for illustrating the present invention, rather than limiting the protection scope of the present invention.
[0035] figure 1 The flow chart of the method for evaluating the aging state of transformer oil-paper insulation provided by the embodiment of the present invention is shown in the figure: a method for evaluating the aging state of transformer oil-paper insulation provided by the present invention includes the following steps:
[0036] S1: Perform multi-exponential fitting on the depolarization current of the oil-paper sample to obtain the Debye circuit parameters of the oil-paper sample;
[0037] S2: Simulate the depolarization current through the obtained Debye circuit parameters;
[0038] S3: Calculate the depolarization electric quantity through the obtained depolar...
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The invention discloses a method for assessing a transformer oil-paper insulation aging state. The method comprises the steps that a multi-term index fitting is conducted on a depolarization current of a test oil-paper, Debye circuit parameters of the test oil-paper are obtained, the depolarization current is simulated through the obtained Debye circuit parameters, depolarization electric quantity is calculated and obtained through an obtained depolarization current expression, and at last the insulation aging states of the test oil-paper are judged through the depolarization electric quantity. According to the method for assessing the transformer oil-paper insulation aging state, the insulation aging state of the test oil-paper is assessed with adoption of an index function relation followed by the stable depolarization electric quantity and insulation paper polymerization degree. Due to the fact that multi-term index fitting is conducted on the depolarization current of the test oil-paper, the depolarization current is simulated through the obtained Debye circuit parameters, the depolarization electric quantity is calculated and obtained through the obtained depolarization current expression, influence to test results of noise and other factors is removed, an electric current curve is made to be smooth, the insulation aging state of the test oil-paper is judged through the depolarization electric quantity, and judging accuracy rate is improved.
Description
technical field [0001] The invention relates to the field of electrical technology, in particular to a method for evaluating the aging state of transformer oil-paper insulation by using depolarized electricity. Background technique [0002] With the rapid development of my country's electric power industry, power transformers are developing in the direction of ultra-high voltage and large capacity, and the power grid is also being organized into a huge regional or even cross-regional large power grid. However, with the increase of power equipment capacity and power grid The expansion of the scale puts forward higher requirements for the safe operation and power supply reliability of the power system. The oil-immersed power transformer plays an important role in the power system and is one of the most important and expensive electrical equipment in the power system. The safety and reliability of operation is directly related to the safety and stability of the power system. The...
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IPC IPC(8): G01R31/12
Inventor 郝建廖瑞金侯兴哲吴高林王谦伏进唐超李娇
Owner STATE GRID CORP OF CHINA