Detection method for common mode disturbance of ground loop

Abstract

The invention discloses a detection method for common mode disturbance of a ground loop. The method adopts time-domain analysis in combination with frequency-domain analysis, and detects the common mode disturbance between any two ground points which covers 0 Hz to 150 KHz, so as to clearly judge the disturbance condition of an equipment or a system in the ground loop, and finally used for supporting the selection and the confirmation of the electromagnetic compatibility ground point. The method comprises the following steps of an investigating stage, a detecting stage, and an analyzing stage:in the investigating stage, acquiring parameter characteristics of a system to-be-detected or an equipment to-be-detected, wherein the parameter characteristics comprise a normal working electric parameter range, a sensitive frequency range, a transmission frequency range, and an alternative equipotential ground point of a sensing element; the detecting stage comprises a time-domain detecting anda frequency-domain detecting, and acquiring a disturbance signal of a required frequency range through the time-domain detecting and the frequency-domain detecting; and in the analyzing stage, analyzing and judging the risk of the electromagnetic interference, and selecting the ground point supporting electromagnetic compatibility by judging whether the ground loop has conducted disturbances andjudging the disturbance strength corresponding to different disturbance frequencies.

Description

technical field [0001] The invention provides an analysis and judgment method for electromagnetic compatibility grounding of electrical equipment and integrated systems based on time domain and frequency domain signal detection means, and belongs to the field of electronics and electricity. Background technique [0002] With the rapid development of rail transit technology, there are more and more types and functions of electrical equipment. Correspondingly, the equipment pays special attention to protective grounding. However, the design and compliance verification of existing protective grounding are relatively simple and do not conform to current technology. Innovation requirements. [0003] Grounding design is a complex concept that is compatible with design concepts such as protective ground, functional ground, and electromagnetic compatibility ground. Usually, electromagnetic compatibility grounding is the most abstract, and in actual design and production, it often s...

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Problems solved by technology

The conduction disturbance before 9KHz is also limited by the harmonic emission of the working circuit that does not involve the ground circuit. This situation results in the vacancy of the ground disturbance test in some low-frequency bands.

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