Cable detection test system containing harmonic current

Abstract

The invention discloses a cable detection test system containing harmonic current. Comprising a cable fault model, a fault manufacturing module, a test cable and a higher harmonic measurement module which are connected in sequence, and a detection module which is connected with the test cable and the higher harmonic measurement module. The cable fault model is used for simulating various faults; the fault manufacturing module is used for manufacturing a cable fault on a test cable; the higher harmonic measurement module is used for measuring higher harmonic characteristic values and generating a higher harmonic database; and the detection module is used for acquiring a mapping relation between the harmonic component content and the cable defect type so as to acquire the cable defect type and make a fault symptom prompt. According to the invention, a circuit system carrying a DSP chip is adopted to carry out high-order harmonic measurement, a processor and a memory are designed, detected harmonic component data are received, a high-order harmonic database in which high-order harmonic characteristic values correspond to the defect type of a tested cable is generated, and automatic intelligent detection is realized.

Description

technical field [0001] The invention belongs to the technical field of cable running state diagnosis, in particular to a cable detection test system containing harmonic current. Background technique [0002] In recent years, power outages caused by cable faults have caused great harm. Accurately diagnosing the running status of cables is an important prerequisite for preventing cable failures. [0003] At present, there are many methods for detecting the deterioration state of cables, such as: DC method, bridge method, dielectric loss tangent method, low frequency method, partial discharge monitoring method, etc. Each method has its own advantages, but none of them can comprehensively reflect the overall status of the cable, nor can it reflect the operating environment status and remaining service life of the cable. [0004] Therefore, condition assessors urgently need a diagnostic method and system for accurately assessing the deterioration state of cables. SUMMARY OF T...

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Problems solved by technology

[0005] The main purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, provide a cable detection test system containing harmonic currents, infer the relationship between the harmonic currents and the degree of cable degradation, and use high-order harmonics and various The relationship between cable defects establishes a high-order harmonic database, so that when the characteristics of a certain cable’s high-order harmonic components are collected and input into the database, the possible defects of the cable can be matched

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