Online electric abrasion detecting method and system of vacuum circuit breaker

Abstract

The invention discloses an online electric abrasion detecting method and system of a vacuum circuit breaker. The online electric abrasion detecting system comprises three current transformers, a current signal conditioning unit, a digital-to-analogue conversion unit, three electric arc property probers, an electric arc signal conditioning unit, an arc time pre-treatment unit, an on-off frequency counting pre-treatment unit, a central processing unit, a local alarming unit and a power supply unit. By improving the forecasting and the selection of an online detection actual parameter of electric service life in an on-off current weighting accumulation method, the influence caused by a wider parameter selection range in an estimation and calculation process according to experience data, particularly large result deviation caused by single abrasion amount accumulation by an on-off current index, can be overcome.

Description

technical field [0001] The invention relates to the field of on-line monitoring of electric switchgear, in particular to an on-line detection method and system for electrical wear of a vacuum circuit breaker. Background technique [0002] With the planning and application development of smart grid technology, the demand for smart equipment and related technologies in smart distribution network is increasing. In the power system, the circuit breaker is the safety guard to ensure the normal and stable operation of the system, and it plays a dual role of control and protection in the system. With the development of technology and application requirements, the intelligent research and application technology of power high-voltage switches has received high attention from system operators and scientific researchers. The development and application of intelligent switches has become a current research hotspot. In the past, the detection and fault diagnosis of the electrical wear o...

AI Technical Summary

Problems solved by technology

The above method has the following shortcomings in the calculation formula: 1) The integral coefficient K and breaking current index α in the formula for calculating the single wear amount are based on empirical formulas, the parameter selection range is large, and the calculation error for the single cumulative wear amount is relatively large, lacking The theoretical basis of the system; 2) The total amount of theoretical wear is estimated according to the electrical life curve, and there is no exact theoretical and calculation basis

Based on the above analysis, the monitoring accuracy and accuracy of the online detection and diagnosis system for electrical wear established by the above method is not high. Therefore, to find a more accurate evaluation method and means of electrical wear is the premise of realizing online detection and condition maintenance of electrical wear.

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