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Rapid diagnosis method for loss decoupling of crosslinked polyethylene cable insulation low-frequency dielectric

A cross-linked polyethylene and cable insulation technology, which is applied in the direction of measuring electricity, measuring electrical variables, and testing dielectric strength, etc., can solve the problems of inability to distinguish types, shorten the measurement time, shorten the diagnosis time, and accurately reflect the aging status of cables Effect

Active Publication Date: 2021-07-20
YANGTZE UNIVERSITY
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Problems solved by technology

[0004] According to literature research, the existing time-frequency domain conversion method can only obtain the overall dielectric loss factor spectrum of the cable in the application of the cable insulation aging state diagnosis, and cannot distinguish the types of the overall loss in detail. The present invention proposes a cross-linked polymer Rapid diagnosis method for low frequency dielectric loss decoupling of vinyl cable insulation

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  • Rapid diagnosis method for loss decoupling of crosslinked polyethylene cable insulation low-frequency dielectric
  • Rapid diagnosis method for loss decoupling of crosslinked polyethylene cable insulation low-frequency dielectric
  • Rapid diagnosis method for loss decoupling of crosslinked polyethylene cable insulation low-frequency dielectric

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Embodiment Construction

[0040] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings, but they do not constitute a limitation to the present invention, and are only examples. At the same time, the advantages of the present invention will become clearer and easier to understand. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0041] figure 1 It is a schematic diagram of polarization current measurement of cross-linked polyethylene cable; the measurement time of polarization current is 1800s, according to the Nyquist sampling theorem, the lower limit frequency can be obtained after time-frequency domain conversion is 0.001Hz; the shorter the measurement time, the better the insulation performance of the cable. The frequency range of the dielectric loss factor is smaller, the...

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Abstract

The invention discloses a rapid diagnosis method for loss decoupling of a crosslinked polyethylene cable insulation low-frequency dielectric. The rapid diagnosis method is characterized by comprising the following steps: firstly, measuring a polarization current value of a cable; carrying out time-frequency domain conversion through an extended Debye model, rapidly converting a measured polarization current value into a dielectric parameter in a corresponding frequency domain, and obtaining an XLPE cable insulation overall dielectric loss factor tan delta; on this basis, splitting the overall dielectric loss factor to obtain conductivity loss and polarization loss, and extracting polarization loss tan [delta] p3 caused by the water tree defect by expanding a polarization branch caused by the water tree defect on a Debye model; and judging the aging state of the cable by comparing the tan delta p3 value near the peak frequency. According to the invention, the aging state of the cable can be quickly diagnosed on site, the diagnosis time can be greatly shortened, and the aging state of the cable can be accurately reflected.

Description

technical field [0001] The invention relates to the field of insulation material aging evaluation methods, and more specifically relates to a rapid diagnosis method for decoupling low-frequency dielectric loss of XLPE cable insulation. It can quickly diagnose the aging state of XLPE cables. Background technique [0002] Cross-linked polyethylene cables (XLPE cables) are widely used in urban power transmission lines. However, in actual use, XLPE cables are easily affected by various factors such as mechanical damage, moisture infiltration, and chemical corrosion, which will lead to gradual deterioration of cable insulation, and even insulation failure, which will cause power grid outages. Statistics show that water tree aging is the main cause of cable system failure. Therefore, the detection and evaluation of the insulation state of XLPE cables is of great significance to the reliability of urban power supply. [0003] The FDS test time in the low frequency band may be as...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R27/26
CPCG01R31/1272G01R27/2694Y02E60/00
Inventor 叶刚程祥李涛杨友平夏振华蔡昌新
Owner YANGTZE UNIVERSITY