Locating method and system for detecting abnormal grounding of large enclosed bus casing

Abstract

The invention discloses a locating method and system for detecting abnormal grounding of a large enclosed bus casing. The system comprises a current step-up device, an induced electric field measurement device and an abnormal grounding locating device. A preset AC is input to the enclosed bus casing to be detected, induced electric field data of measuring points in the enclosed bus casing to be detected is measured distance by distance along a direction of an enclosed bus to be detected, and whether the induced electric field difference between two adjacent measuring points is greater than a preset threshold is determined to locate a position of abnormal grounding rapidly. Thus, the positioning system can be used to locate abnormal grounding rapidly, and compared with a manual visual detection method, the working efficiency is improved greatly, the problem checking period is shortened, the engineering cost is reduced, a fault can be found more successfully, detection omission of manualsearching can be avoided effectively, the detection quality is improved, and a detection effect is ensured.

Description

technical field [0001] The invention relates to the technical field of equipment maintenance, in particular to a positioning method and a system for detecting abnormal grounding of a large-scale closed busbar shell. Background technique [0002] Large-scale nuclear power plants and conventional power plants usually use isolated-phase closed busbar structures from the generator outlet to the main transformer, and from the main transformer to the booster station. The metal casing is used to contain the high-current conductors. The design has strict requirements on the grounding of the metal casing. Generally, Single-point grounding or multi-point grounding. However, due to the aging of insulating components, complicated on-site crossing operations, and dirt, other abnormal grounding points are not uncommon on the site. Sometimes the fault point is hidden, and it is difficult to find the problem by conventional manual inspection methods. Bigger problem. [0003] Due to the la...

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Problems solved by technology

[0004] Defect 1. Long average construction period and low efficiency: Some abnormal grounding points are very hidden, such as rubber sleeve insulation deterioration, hidden cable bracket laps, etc. The average problem finding period is more than 20 days. The construction period has a great impact, which is not conducive to the control of project cost;

[0005] Defect 2. The success rate of fault finding is not high: visual inspection can only see some abnormal grounding points within the range of viewing angles, and it cannot be inspected for areas with blind spots that cannot be reached by personnel, and hidden insulation degradation (such as aging of insulating rubber sleeves) It is also impossible to check, resulting in the problem that even if most of the abnormal grounding is handled, the insulation is still unqualified;

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