Testing method, device and system for transformer winding

Abstract

The embodiment of the invention discloses a testing method, device and system for a transformer winding. The method includes the steps that a high-frequency signal source is used for generating a sinusoidal voltage signal; the sinusoidal voltage signal is converted into constant high-frequency current; the constant high-frequency current is exerted on the winding to be tested; sampling voltage and sampling current signals of the winding to be tested are collected; the sampling voltage and sampling current signals are transmitted and calculated, so that a testing result is obtained. A current source is adopted as the signal source, namely, the constant-current source composed of a high-frequency voltage signal source, a current converter and a high-voltage power calculation amplifier is used for transmitting the testing signal; in this way, when the transformer winding is tested through a frequency response method, the current source constantly generates the constant current, in this way, the requirement for sampling precision needed for testing is lowered, the iron core in a transformer is prevented from forming eddies, the stability and reliability of the testing result are guaranteed, and the technical effect that the testing result is good in uniformity is achieved.

Description

technical field [0001] The invention relates to the technical field of transformer testing, in particular to a transformer winding testing method, equipment and system. Background technique [0002] The transformer needs to be strictly tested before leaving the factory to ensure the reliability of the transformer. Under the action of high-frequency voltage, each winding of the transformer can be regarded as a passive linear circuit composed of distributed parameters such as linear resistance, inductance, and capacitance. A dual-port network whose internal characteristics can be described by a transfer function. If the winding is deformed, the distributed inductance, capacitance and other parameters inside the winding will inevitably change, resulting in changes in the zero and pole points of its equivalent network transfer function, which will change the frequency response characteristics of the network. [0003] The amplitude-frequency response characteristics of the trans...

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Problems solved by technology

[0004] The traditional transformer frequency response test uses a voltage source to scan. During the test, the test voltage cannot change with the impedance of the transformer. When testing different transformers, the magnitude of the test current will change, and then in the transformer core The formation of eddy currents will affect the test results

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