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A test method for moisture intrusion point of oil-immersed high-voltage bushing

A technology of high-voltage bushings and testing methods, which is applied in the direction of testing dielectric strength, measuring electricity, and measuring devices, and can solve problems such as internal insulation being damp, low sensitivity, and inconspicuous reflection of moisture content

Active Publication Date: 2019-08-02
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

The conventional dielectric loss tangent value and capacitance test of the bushing do not reflect the moisture content in the bushing obviously, and the sensitivity is low, and it can only reflect the overall damp condition of the bushing. Visual inspection, that is, whether there are traces of rust, once signs of intrusion are found, the internal insulation may have been severely damp, so it is urgent to study a method for testing the moisture intrusion point of oil-immersed high-voltage bushings

Method used

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  • A test method for moisture intrusion point of oil-immersed high-voltage bushing
  • A test method for moisture intrusion point of oil-immersed high-voltage bushing
  • A test method for moisture intrusion point of oil-immersed high-voltage bushing

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with accompanying drawing:

[0034] figure 1 Shown is a flow chart of the test method for the water intrusion point of the oil-immersed high-voltage bushing. figure 1 It can be seen that a test method for the moisture intrusion point of an oil-immersed high-voltage bushing mainly includes the following steps:

[0035] Step 1: Acquisition of Baseline Quantity

[0036] Obtain the insulation structure parameters and dielectric spectrum test for the new casing of the same type as the oil-immersed casing to be diagnosed, and the frequency f range is 10 -3 ~10 3 Hz, to obtain the reference dielectric spectrum dielectric loss curve F of the bushing 0 (f);

[0037] Step 2: Feature Extraction

[0038] Use the Havriliak-Negami dielectric relaxation model to analyze the frequency-domain dielectric spectrum curve to obtain dielectric parameters, including high-frequency dielectric constant ε ∞ , relaxation ...

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Abstract

The invention discloses a test method for a moisture intrusion point of an oil-immersed high pressure bushing. External insulation of the oil-immersed high pressure bushing is damaged due to defect ofproduction technology or improper installation and moisture in the environment intrudes the bushing via the damaged position continuously, but a dielectric loss tangent value and a capacitance of thebushing at present can only be used to evaluate the total moisture state of internal insulation of the bushing, and the moisture intrusion point of the bushing cannot be determined. According to thetest method of the invention, parameters of a hidden Markov model in different moisture intrusion points, moisture concentrations and temperatures are obtained, the probabilities of different moistureintrusion points of the bushing are calculated via a shuffled frog leaping algorithm according to a frequency-domain dielectric spectrum curve of test, and the moisture intrusion point of the oil-immersed high pressure bushing can be tested effectively.

Description

technical field [0001] The invention belongs to the field of insulation state evaluation of oil-immersed high-voltage bushings, and in particular relates to a method for testing the moisture intrusion point of oil-immersed high-voltage bushings. Background technique [0002] The oil-immersed high-voltage bushing is the main current drainage and insulation equipment of the transformer. The quality of its insulation performance directly affects the reliability of the transformer operation and the safety of the power system. Moisture is one of the main factors that seriously affect the insulation performance of bushings next to temperature. The existence of moisture will accelerate the aging rate of transformer insulating paper, resulting in a decrease in the dielectric properties of the transformer's internal insulation, and even lead to partial discharge of the internal insulation of the bushing. The on-site dissection of a large number of damp fault bushings shows that the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
CPCG01R31/1245
Inventor 廖维周利军陈雪骄王安李会泽
Owner SOUTHWEST JIAOTONG UNIV
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