Method and device for automatically calibrating micro-ammeters

An automatic calibration and ammeter technology, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problem of low test accuracy

Inactive Publication Date: 2011-11-23
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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Problems solved by technology

[0003] The purpose of the present invention is to provide a micro-ammeter automatic calibration method and its device, which solves the problem of low test accuracy of the micro-ammeter used in the isothermal relaxation current method (IRC) test system for the insulation performance of high-voltage equipment. The device calibration can greatly improve the test accuracy of the micro ammete

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[0022] The specific embodiments described here are only used to explain the present invention, and are not suitable for limiting the present invention.

[0023] The basic working principle of the calibrator is to first use a precision voltage source to measure a piezoelectric curve by a precision ammeter through a standard resistance, then use a precision voltage source to measure a piezoelectric curve through an ammeter to be corrected, and use data fitting to obtain two curves parameters, and then through coefficient correction to make the curve of the ammeter to be corrected as close as possible to the standard ammeter.

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] One, such as figure 1 Summary of the Invention: The present invention is a micro-ammeter automatic calibration system used in a micro-ammeter module in an isothermal relaxation current method (IRC) test system, including a hardware part a...

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Abstract

The invention provides a method and device for automatically calibrating micro-ammeters, which relate to the technical field of micro-ammeter calibration equipment. The method comprises the following steps that: firstly, through using a precision voltage source and a standard resistor, a voltage-current curve is obtained through measurement by using a precision ammeter; then, through using the precision voltage source, a voltage-current curve is obtained through measurement implemented by an ammeter to be calibrated; through data fitting, the parameters of the two curves are obtained; and through coefficient correction, the curve of the ammeter to be calibrated is close to that of a standard ammeter as far as possible. A hardware part of the device provided by the invention mainly comprises a computer, a precision voltage source, a standard resistor, a conversion module, a precision ammeter and an ammeter to be calibrated. By using the method and device provided by the invention, the test accuracy of a micro ammeter can be greatly improved, even close to that of a precision electrometer-level ammeter; the method is simple and reasonable, unique in principle and high in accuracy; the device is simple in structure and stable in performance; and the test accuracy requirements of the micro ammeter used in a depolarized relaxation current test for the insulation performance of high voltage equipment can be satisfied.

Description

technical field [0001] The invention relates to the technical field of micro-ammeter calibration equipment, in particular to a calibration method and device for a micro-ammeter used in an isothermal relaxation current method (IRC) test system for the insulation performance of high-voltage equipment. Background technique [0002] Current signal detection is an important means to evaluate the insulation state of insulating materials in high-voltage equipment. According to the nature of the measured current, the measured current signal can be divided into two categories: one is the polarization relaxation current of high-voltage equipment insulation under high-voltage electric field, The other is the depolarization relaxation current of high-voltage equipment insulation after the high-voltage electric field is removed. Isothermal relaxation current method (IRC) is a new type of non-destructive insulation state detection method based on current signal detection. Its basic princi...

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Application Information

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IPC IPC(8): G01R35/00
Inventor 高树国潘瑾范辉尹毅王志浩刘宏亮吴建东纪哲强
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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