Method for judging insulation state of medium-high voltage cables through metal sheath circulating current

A technology of medium and high voltage cables and metal sheaths, which is applied in the direction of measuring electricity, testing circuits, and measuring electrical variables, etc., can solve problems such as unfavorable implementation and promotion, complicated realization principles, and complicated diagnostic method devices, etc. Realize the effect of low cost, simple and efficient technical principle

Inactive Publication Date: 2018-09-28
STATE GRID PUTIAN ELECTRIC POWER SUPPLY +1
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Problems solved by technology

[0005] However, the technical solution of the above invention also needs to apply an exponential waveform voltage on the cable, the realization principle is complicated, and it cannot be diagnosed d

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  • Method for judging insulation state of medium-high voltage cables through metal sheath circulating current
  • Method for judging insulation state of medium-high voltage cables through metal sheath circulating current
  • Method for judging insulation state of medium-high voltage cables through metal sheath circulating current

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[0036] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0037] In order to solve the problems of complex realization, low efficiency and high generation in the prior art, the present invention provides a method for judging the insulation status of medium and high voltage cables through metal sheath circulation, which can objectively reflect the outer sheath of the cable. The principle of the insulation condition is to detect the circulating current flowing through the metal sheath and compare it with the standard value. If the circulating current flowing through the metal sheath is greater than the standard value, the cable insulation failure is judged. Among them, the standard value is generally not more than 10% of the core current.

[0038] In the present invention, the size of the circulating current is related to the cable material, wiring method, current carrying capacity, etc. Therefore, building a complete set...

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Abstract

The invention relates to a method for judging the insulation state of medium-high voltage cables through metal sheath circulating current. A complete circulating current analysis model is establishedfor the metal sheath circulating current, abnormal causes of the metal sheath circulating current are analyzed, targeted prevention measures are proposed, and the method has a significant meaning forreliable operation of high voltage cables. According to the method, a capacitive current calculation model and an induced current calculation model are established, input parameters of the models canbe obtained by directly measuring parameters of the cables and are substituted into the models for calculation, and the insulation state of the medium-high voltage cables is judged according to a calculation result. The technical principle is simple and efficient, complicated devices are not needed during implementation, the implementation cost is low, and convenience is provided for implementation and popularization.

Description

technical field [0001] The invention relates to an analysis technology of cable insulation state, more specifically, relates to a method for judging the insulation state of medium and high voltage cables through metal sheath circulation current. Background technique [0002] With the development of urban power systems, cables, as a special underground "overhead line", are more and more widely used in the entire urban distribution network. [0003] However, due to the effects of electromagnetic fields, machinery, chemistry, light and other factors, the cable insulation will age in varying degrees, which will eventually lead to cable insulation damage or breakdown, and the size of the cable metal sheath circulation can objectively reflect the cable operating conditions. [0004] Chinese invention patent application 201510290476.8 discloses a cable insulation state diagnosis method and diagnosis device. Apply a periodic exponential waveform voltage to the detected cable; calcu...

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Application Information

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IPC IPC(8): G01R31/14G01R31/12
CPCG01R31/14G01R31/1272
Inventor 庄建煌林征周静林敏翁桂萍林益鹤柯拥勤
Owner STATE GRID PUTIAN ELECTRIC POWER SUPPLY
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