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Nuclear-grade power cable aging degree diagnosis method

An aging degree, power cable technology, applied in the direction of testing dielectric strength, measuring electricity, measuring electrical variables, etc., can solve problems such as non-destructive rapid diagnosis of aging degree of K3 type XLPE cables that cannot be nuclear grade

Pending Publication Date: 2020-09-22
RES INST OF NUCLEAR POWER OPERATION +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for diagnosing the aging degree of nuclear-grade power cables, which solves the problem in the prior art that the aging degree of nuclear-grade K3 XLPE cables cannot be non-destructively and quickly diagnosed

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  • Nuclear-grade power cable aging degree diagnosis method

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Embodiment Construction

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] A method for diagnosing the aging degree of nuclear-grade power cables, the method specifically includes the following steps:

[0025] Step 1. Perform a polarization-depolarization current test on the cable to be diagnosed to obtain the polarization current and depolarization current of the cable to be diagnosed;

[0026] Perform polarization-depolarization current test on the XLPE cable to be diagnosed to obtain the polarization current i of the cable to be diagnosed pol (t) and depolarization current i depol (t), where the polarization voltage applied in the polarization-depolarization current test is 1-2kV, and in each polarization-depolarization current test, the polarization time and depolarization time are the same, and the polar The polarization time and depolarization time are 90-180s;

[0027] Step 2. Obtain the inter...

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Abstract

The invention relates to the technical field of power cable aging evaluation, and particularly discloses a nuclear-grade power cable aging degree diagnosis method. The method specifically comprises the following steps: 1, carrying out a polarization-depolarization current test on a to-be-diagnosed cable to obtain a polarization current and a depolarization current of the to-be-diagnosed cable; 2,acquiring the interfacial polarization charge quantity of the cable to be diagnosed; and 3, obtaining an aging degree diagnosis result of the cable according to the interface polarization charge quantity. According to the method, the characteristic that the more serious the aging is, the more obvious the interfacial polarization phenomenon is can be utilized, so that the overall aging condition ofcable insulation is judged, meanwhile, no damage is caused to the insulation due to lower test voltage, the degree of influence of irradiation aging factors on the state of XLPE insulation is evaluated, and the aging degree of the XLPE insulation is analyzed.

Description

technical field [0001] The invention belongs to the technical field of power cable aging assessment, and in particular relates to a method for diagnosing the aging degree of nuclear-level power cables. Background technique [0002] With the gradual increase in the application of XLPE cables in the field of nuclear power, various aging conditions that may occur during cable operation have gradually emerged. The cables running in nuclear power plants may be threatened by radiation aging or thermal aging caused by overload, which may cause the overall aging of the XLPE insulation medium, which in turn reduces the insulation performance of the XLPE medium and poses a potential safety hazard. Therefore, during the service process of nuclear grade K3 power cables, it is helpful to determine the insulation aging degree of them to analyze the life of the cable insulation, so as to take corresponding measures in advance to reduce the risk of breakdown. [0003] The patent applicatio...

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Application Information

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IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 云浩张益舟汪亮王雷桂春林思衍周凯
Owner RES INST OF NUCLEAR POWER OPERATION
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