A non-destructive test method for measuring stray capacitance of transformer-type devices
By treating multi-winding transformers as parallel circuits and scaling the signal time axis, the problem of insufficient accuracy in stray capacitance measurement of transformer-type equipment is solved, achieving non-destructive and accurate capacitance measurement.
CN116223919BActive Publication Date: 2026-07-17CHONGQING UNIV
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHONGQING UNIV
- Filing Date
- 2023-01-10
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
Existing technologies are insufficient for efficiently and accurately measuring stray capacitance in transformer-type equipment, especially when considering the effects of core hysteresis.
Method used
The multi-winding transformer is abstracted as a parallel circuit consisting of stray capacitance C, loss resistance R, and static hysteresis L. The precise value of stray capacitance C is calculated through two sets of frequency converter power supply tests and signal time axis scaling.
Benefits of technology
It enables accurate measurement of stray capacitance in transformer-type equipment, is suitable for non-destructive testing, and is simple to use, making it suitable for batch automated testing.
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Figure CN116223919B_ABST
Abstract
The present application relates to a kind of non-destructive test method for measuring stray capacitance of transformer type equipment, belong to the field of transformer type equipment parameter measurement and accurate modeling.The method comprises: S1: the multi-winding transformer is abstracted as the parallel circuit composed of stray capacitance C, loss resistance R and static magnetic hysteresis L;S2: connecting variable frequency power supply to the arbitrary port of transformer, and carrying out two groups of tests: in the first group of experiments, the power supply voltage is set as u s1 , effective value is U s1 , frequency is f s1 ;In the second group of experiments, the power supply voltage is set as u s2 , effective value is U s2 , frequency is f s2 ;S3: the time axis of all signals in the second group of experiments is scaled, so that its frequency f s2 It is artificially processed as f s1 ;S4: according to parallel circuit principle, the accurate value of transformer type equipment stray capacitance C is calculated.The present application realizes accurate measurement to transformer type equipment stray capacitance through simple, non-destructive port test.
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