PDC(Polarization and Depolarization Current)-based diagnosis model and diagnosis method for diagnosing insulation water treeing ageing of XLPE (Cross Linked Polyethylene) cable
A technology of cable insulation and diagnosis method, which is applied in the direction of measuring electricity, measuring electrical variables, and testing dielectric strength, etc., can solve the problems that cannot fully reflect the aging status of cable water trees, and achieve the effect of perfecting the equivalent model
Inactive Publication Date: 2018-10-09
武汉脉源电气有限公司
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[0003] At present, a lot of research has been done on cable insulation diagnosis methods at home and abroad. Among them, the PDC (Polarization and Depolarization Current, PDC) method is an effective test method for detecting the aging of electrical equipment. advantages, and can deeply reflect the aging information of equipment from the level of aging mechanism, but the current diagnosis method based on water tree aging characteristics cannot fully reflect the water tree aging status of cables
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[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.
[0035] see Figure 1-Figure 6 In this embodiment, a diagnostic model and diagnostic method for water tree aging of XLPE cable insulation based on the PDC method, the traditional extended Debye model is to use three groups of resistance-capacitor series branches to characterize the three polarization mechanisms in the XLPE cable insulation, such as figure 1 As shown, but due to the polarity effect, rectification effect and space charge effect of XLPE cable water tree aging, the space charge injected in the polarized state will be bound by the trap inside the insulation and cannot be released when depolarized. The capacitance of each branch (C 1 、C 2 、C 3 ) are each connected in parallel with an ideal diode (D d1 ...
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The invention discloses a PDC(Polarization and Depolarization Current)-based diagnosis model and diagnosis method for diagnosing the insulation water treeing ageing of an XLPE (Cross Linked Polyethylene) cable, and a diode equivalent model for characterizing the water treeing ageing of the cable is provided on the basis of the traditional expansion Debye model. A diode capacitor Cd3 of a third circuit branch of the model is more sensitive to the ageing of the cable, and can characterize the quantity of space charges bound by a trap caused by the water treeing ageing; and the nonlinear variation characteristic of the quantity of space charges shown along with the increase of the voltage magnitude reflects the ageing degree of the cable, therefore, the water treeing ageing state of the cableis diagnosed by detecting the diode capacitor Cd3 of the third circuit branch. Therefore, the provided PDC-based diagnosis method for diagnosing the insulation water treeing ageing of the XLPE cableimproves the equivalent model of the water treeing ageing cable, the defect condition caused by the water treeing ageing is also accurately reflected through the detected characteristic parameter Cd3,and the effective diagnosis method is provided for diagnosing the water treeing ageing state of the cable.
Description
technical field [0001] The invention relates to a diagnosis model and a method for diagnosing water tree aging of XLPE cable insulation based on a PDC method. Background technique [0002] Crosslinked Polyethylene (XLPE) cables have become the most widely used cable type due to their excellent mechanical and electrical properties. Cable insulation aging will occur during operation, and water tree aging is the main cause of cable insulation failure. Therefore, the development of XLPE cable insulation water tree aging diagnosis technology is of great significance for improving the stability of power systems. [0003] At present, a lot of research has been done on cable insulation diagnosis methods at home and abroad. Among them, the PDC (Polarization and Depolarization Current, PDC) method is an effective test method for detecting the aging of electrical equipment. Advantages, and can deeply reflect the aging information of equipment from the level of aging mechanism, but the...
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IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 赵正涛
Owner 武汉脉源电气有限公司