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A method for evaluating the aging state of 10kv XLPE cable insulation

An aging state, cable insulation technology, applied in the direction of measuring electricity, measuring electrical variables, testing dielectric strength, etc., can solve the problem of inaccurate insulation state, and achieve the effect of effective evaluation and accurate evaluation method

Active Publication Date: 2020-10-30
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0003] At present, the fault insulation state assessment method for 10kV XLPE cables is mainly by testing the partial discharge spectrum of the cable, but it is not accurate to directly characterize the insulation state of the cable by obtaining the basic information of the discharge spectrum. Discharge spectrum information, a reliable and effective method for in-depth assessment of the aging state of 10kV XLPE cable insulation

Method used

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  • A method for evaluating the aging state of 10kv XLPE cable insulation
  • A method for evaluating the aging state of 10kv XLPE cable insulation
  • A method for evaluating the aging state of 10kv XLPE cable insulation

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Embodiment Construction

[0029] The present invention will be further described below.

[0030] figure 1 It is a flow chart of the 10kV XLPE cable insulation state evaluation method based on the improved standardization, including the following steps: Step 1: Conduct partial discharge test on 10kV XLPE cables

[0031] Use the step-up method to pressurize the 10kV XLPE cable, boost the voltage step by step with a gradient of 0.5kV, keep the constant voltage for 10min at each level of voltage, and collect phase-discharge data at each level of voltage Boost to 10kV;

[0032] Step 2: Stage the entire testing process

[0033]

[0034] That is, when D=1, the applied voltage is 0.5kV to 2.5kV, which is the S1 stage of the test; when D=2, the applied voltage is 3.0kV to 5.0kV, which is the S2 stage of the test; when D=3, The applied voltage is 5.5kV to 7.5kV, which is the S3 stage of the test; when D=4, the applied voltage is 8.0kV to 10.0kV, which is the S4 stage of the test;

[0035] Step 3: Calcula...

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Abstract

The invention discloses a 10kV XLPE cable insulation aging evaluation method. The method comprises the following steps of step 1), performing partial discharge test on a 10kV XLPE cable; step 2), performing stage division on the whole test process; step 3), respectively calculating an improved normalized coefficient of the maximum discharge capacity in each stage; step 4), calculating an aging state factor; and step 5), evaluating the insulation aging state of the tested cable by using the aging state factor. The 10kV XLPE cable insulation aging evaluation method provided by the invention hasthe following beneficial effects: (1), different characteristic quantities characterized by different stages in the test process are effectively extracted, and the evaluation method is more accurate;and (2) the characteristic parameters are extracted according to partial discharge information, the aging state factor is calculated, and the insulation aging state of the XLPE cable is more effectively evaluated.

Description

technical field [0001] The invention belongs to the field of insulation faults of distribution network cables, and in particular relates to a method for evaluating the insulation aging state of 10kV XLPE cables. Background technique [0002] As an important part of the distribution network, the 10kV cable plays a key role in the transmission of electric energy. The quality of its electrical insulation performance directly affects the effective operation of the transmission system and electrical equipment, and is related to the reliability of the distribution network. The insulation state of 10kV cables will be affected by factors such as service life and operating environment. Therefore, it is of great significance to study the evaluation method of 10kV XLPE cable insulation aging state. [0003] At present, the fault insulation state assessment method for 10kV XLPE cables is mainly by testing the partial discharge spectrum of the cable, but it is not accurate to directly ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
CPCG01R31/1272
Inventor 郭蕾李丽妮王冲张靖康杨涵曹伟东邢立勐
Owner SOUTHWEST JIAOTONG UNIV
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