An AC Impedance Bridge

A technology of AC impedance and electric bridge, which is applied in the field of high-accuracy current transformer-type AC impedance bridge, to achieve the effects of reducing influence, improving overall accuracy, and increasing proportional accuracy

Active Publication Date: 2018-03-02
BEIJING DONGFANG MEASUREMENT & TEST INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to overcome the defect of existing AC impedance bridge, and the present invention proposes a solution and an implementation approach around overcoming the influence of common mode interference, leakage current and interturn capacitance of current transformer

Method used

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  • An AC Impedance Bridge
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Embodiment Construction

[0034] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation methods.

[0035] In the figure, Rx-resistance to be measured; Ro-standard resistance; Rd-grounding resistance; CTo-standard current transformer; CTd-grounding current transformer; uV-microvoltmeter; A-standard current transformer low end; B- High end of standard current transformer; C-resistance to be measured is at the low potential end of the bridge; D-standard resistance is at the low potential end of the bridge; E-the measuring point of the first microvolt meter; F-the second microvolt Measuring points of the table;

[0036] see Figure 4, shows the AC impedance bridge used to calibrate the resistance of the present invention, wherein the primary side of the grounded current transformer CTd, the primary side of the standard current transformer CTo and...

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PUM

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Abstract

An AC impedance bridge, comprising: a standard current transformer, a microvoltmeter, a power supply, a standard resistance and a measured resistance, characterized in that it also includes a current transformer and a resistance for grounding, wherein the standard current transformer The primary side winding, the primary side winding of the grounding current transformer, and the measured resistance are connected in series, the standard resistance is connected in parallel to the secondary side of the standard current transformer, the grounding resistance is connected in parallel to the secondary side of the grounding current transformer, and the low potential end of the grounding resistance is grounded. The high potential end is connected to the measured resistance and the low potential end of the standard resistance in the electric bridge, and the microvoltmeter is connected between the high potential end of the measured resistance in the electric bridge and the ground.

Description

technical field [0001] The invention belongs to the field of electrical measurement, in particular to a high-accuracy current transformer type AC impedance bridge and a method for calibrating resistance with the bridge. Background technique [0002] The field of electrical measurement has clear requirements for the calibration of AC low-value resistors. There are four main aspects. First, the measurement method of AC current is that the measured current passes through a shunt (sampling resistor) to generate an AC voltage, and the AC voltage and shunt resistance The AC current value is converted from the ratio of the measured current. With the increase of the measured current, the value of the shunt resistance becomes smaller, and its frequency variation should also be small. It needs to be calibrated to determine its value. Calibration under AC conditions; 2. The basis of AC power measurement is to obtain the value of AC voltage and AC current. The accurate measurement of AC...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R17/02
Inventor 黄晓钉
Owner BEIJING DONGFANG MEASUREMENT & TEST INST
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