Method and system for measuring errors of electromagnetic type mutual inductor based on digital signal processing

A technology of digital signal processing and electromagnetic transformers, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of test environment interference, less effective data, and difficult data correction, etc., to achieve no integral saturation effect, Improve measurement accuracy and efficiency, light weight effect

Active Publication Date: 2014-01-29
JIANGSU JINGJIANG INSTR TRANSFORMER FACTORY
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Problems solved by technology

[0005] The purpose of the embodiments of the present invention is to provide an electromagnetic transformer error measurement method and system based on digital signal processing, aiming to solve the problem that the traditional measurement method colle...

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  • Method and system for measuring errors of electromagnetic type mutual inductor based on digital signal processing
  • Method and system for measuring errors of electromagnetic type mutual inductor based on digital signal processing

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[0039] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0040] The application principle of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] Such as figure 1 As shown, the method for measuring the error of an electromagnetic transformer based on digital signal processing in the embodiment of the present invention includes the following steps:

[0042] S101: through the first sampling circuit unit: obtain the measured signal, the combination of the first preamplification circuit unit and the first automatic gain control circuit unit improves the signal-to-noise ratio, the first filter circuit u...

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Abstract

The invention discloses a method and system for measuring errors of an electromagnetic type mutual inductor based on digital signal processing. Detected signals are acquired through a first sampling circuit unit, standard signals are acquired through a second sampling circuit unit, and the detected signals and the standard signals are combined through an amplifying circuit unit and an automatic gain control circuit unit to improve a signal-to-noise ratio, and are converted into digital signals through an AD converter unit, sampling analysis is carried out on the digital signals output by the AD converter unit by respectively adopting corresponding algorithms through an FPGA digital signal processing circuit unit, the amplitude value of a fundamental wave is found out, and a ratio error and a phase difference are obtained through the solution of a division formula. The errors of the electromagnetic type mutual inductor are measured. The method and system are high in processing speed, free of an integral windup effect, simple in achievement, stable in operation, light, high in precision, good in linearity and wide in measurement range, overcome the defects that a traditional mutual inductor measuring device is high in signal requirement and slow in response, and have practical significance in the detection and calibration of an existing electromagnetic type mutual inductor.

Description

technical field [0001] The invention belongs to the technical field of transformer measurement, in particular to an electromagnetic transformer error measurement method and system based on digital signal processing. Background technique [0002] Traditional transformer measurement methods mainly use analog circuits to process signals. During the calibration process, there are high environmental requirements, sensitivity to high-order harmonics in the circuit, and slow speed. The measurement output data needs to be processed by the host computer. The dependence is high, and the digital instrument cannot be connected separately and transmitted and shared in the local area network; [0003] In the original analog circuit, in order to obtain the 90° trigger signal, the integrator in the 90° phase-shift circuit needs to use an operational amplifier, but due to the imperfection of the operational amplifier, the input has a bias current, and the integration saturation effect often ...

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Application Information

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IPC IPC(8): G01R35/02
Inventor 黄麟陆汉兵
Owner JIANGSU JINGJIANG INSTR TRANSFORMER FACTORY
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