CN104459590A - Bandwidth testing method and system of current or voltage sensor - Google Patents

Bandwidth testing method and system of current or voltage sensor Download PDF

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Publication number
CN104459590A
CN104459590A CN201410485410.XA CN201410485410A CN104459590A CN 104459590 A CN104459590 A CN 104459590A CN 201410485410 A CN201410485410 A CN 201410485410A CN 104459590 A CN104459590 A CN 104459590A
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China
Prior art keywords
sensor
tested
voltage
current
curtage
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CN201410485410.XA
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Chinese (zh)
Inventor
孙鹰
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Ningbo CSR Times Transducer Technique Co Ltd
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Ningbo CSR Times Transducer Technique Co Ltd
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Priority to CN201410485410.XA priority Critical patent/CN104459590A/en
Publication of CN104459590A publication Critical patent/CN104459590A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a bandwidth testing method of a current or voltage sensor. The decibel value of the distortion value allowed by the current or voltage sensor is delta Y. Firstly, a direct current signal with the amplitude being A is input to the tested current sensor, or a direct current signal with the amplitude being V is input to the tested voltage sensor, and the amplitude Y1 of the output signal of the tested current sensor or the tested voltage sensor is detected; secondly, the current amplitude A or the voltage amplitude V is kept unchangeable, the frequency of the current signal or the voltage signal input to the tested current or voltage sensor is changed, the output signal amplitude Y2 of the tested current or tested voltage sensor is detected till Y2 can meet the formula seen in the specification, and the frequency F1 of the current signal or the voltage signal input to the tested sensor is the bandwidth of the tested sensor. The invention further discloses a bandwidth testing system of the current or voltage sensor. By means of the bandwidth testing method and system, the frequency range of the current or voltage signal capable of being detected by the current or voltage sensor can be accurately and conveniently tested.

Description

The bandwidth test method of curtage sensor and test macro
Technical field
The present invention relates to sensor testing method, particularly relate to bandwidth test method and the test macro of curtage sensor.
Background technology
At railway, wind-powered electricity generation, industrial frequency conversion, intelligent grid etc., field all needs a large amount of high-precision electric currents, voltage sensor detects automatically, show electric current, voltage, and has automatic protection functions and more senior intelligent control function when the Harm such as overcurrent, overvoltage occurs.Bandwidth is one of electric current, the very important performance index of voltage sensor, which determines the frequency range of the signal that sensor can detect.As a rule, sensor bandwidth refers to the frequency range of the detectable signal of sensor, and the bandwidth of sensor is larger, and the signal frequency range that can survey is wider, and application scenario is wider.If the bandwidth of sensor is inadequate, and when the frequency range of detected signal is wider, the waveform serious distortion that sensor exports; cause being done by the equipment malfunction of its control and protection; to the information of human factor error, gently then cause any property loss in some occasion, heavy then cause life safety.Moment sensor band merit parameter is theory calculate and draws or rule of thumb judge, both at home and abroad all non-sensor bandwidth method of testing and equipment, is therefore necessary method of testing and the testing apparatus of designing sensor bandwidth.
Summary of the invention
Technical matters to be solved by this invention be overcome prior art above-mentioned deficiency and provide a kind of bandwidth test method of curtage sensor, the frequency range of measuring current or the detectable curtage signal of voltage sensor.Present invention also offers a kind of curtage sensor bandwidth test macro, adopt this system can test bandwidth accurately and easily.
The present invention's adopted technical scheme that solves the problem is: the bandwidth test method of curtage sensor, and the decibel numerical value of the distortion value that described curtage sensor allows is the step of measuring current or voltage sensor bandwidth is: be first that the DC current signal of A inputs to tested current sensor by amplitude, or amplitude is that the d. c. voltage signal of V inputs to tested voltage sensor, detects the amplitude Y1 of tested curtage sensor output signal; Then keep current amplitude A or voltage magnitude V constant, change the frequency inputing to the curtage signal of tested curtage sensor, detect the signal amplitude Y2 that tested curtage sensor exports, until Y2 meets time, the frequency F1 inputing to the curtage signal of tested curtage sensor is the bandwidth of tested curtage sensor.
Preferred current amplitude A equals 10%, voltage magnitude V of the specified measurement electric current of tested current sensor and equals 10% of the specified measuring voltage of tested voltage sensor.
The bandwidth test system preferably realizing aforesaid way comprises frequency conversion electric current voltage source module, sample resistance, four-way oscillograph, Double-way dc voltage-stabilizing source, ac current signal or the ac voltage signal of the direct current that frequency conversion electric current voltage source module produces and different frequency input to tested curtage sensor, the output signal of tested sensor is converted to voltage signal for oscillograph collection by sample resistance, the output signal of four-way oscillograph monitoring frequency conversion electric current voltage source module and tested sensor, Double-way dc voltage-stabilizing source provides operating voltage for tested sensor.
When tested curtage sensor is current-output type sensor, tested sensor connects the sample resistance of Ω level; When tested curtage sensor is voltage output type sensor, tested sensor connects sample resistance or the direct sample of k Ω level.
The invention has the advantages that: the bandwidth test method and the test macro that adopt above-mentioned curtage sensor; distortion value, specified measurement curtage can be allowed according to the output signal of sensor requirements; accurately, measurable curtage signal frequency range of sensor is detected quickly; authentic data support is provided for can sensor be applied to the signal measuring multi-frequency scope; avoid the output signal serious distortion caused because of the sensor of misuse bandwidth deficiency; and cause being done by the equipment malfunction of its control and protection, to human factor error information.
Accompanying drawing explanation
Fig. 1 is the test principle block diagram of measuring current or voltage sensor in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiment, the present invention is further described.
When tested sensor is current sensor, and the specified measurement electric current of this current sensor is I, and the distortion value decibel numerical value of permission is , for testing the bandwidth of this current sensor, being first that the DC current signal of A inputs to tested current sensor by amplitude, detecting the signal amplitude Y1 that tested current sensor exports; Then, keep the amplitude A of current signal constant, constantly change the frequency of current signal, make that the frequency of the current signal inputing to tested current sensor constantly changes and current amplitude A is constant, detect the amplitude Y2 of tested current sensor output, when Y2 meets time, record the frequency F1 of the current signal now inputted, F1 is the bandwidth of tested current sensor.
When tested sensor is voltage sensor, and the specified measuring voltage of this voltage sensor is U, and the distortion value decibel numerical value of permission is , for testing the bandwidth of this voltage sensor, being first that the d. c. voltage signal of V inputs to tested voltage sensor by amplitude, detecting the signal amplitude Y1 that tested voltage sensor exports; Then, keep the amplitude V of voltage signal constant, constantly change the frequency of voltage signal, make that the frequency of the voltage signal inputing to tested voltage sensor constantly changes and voltage magnitude V is constant, detect the amplitude Y2 that tested voltage sensor output signal, when Y2 is satisfied time, record the frequency F1 of the voltage signal now inputted, F1 is the bandwidth of tested voltage sensor.
Strict proportionate relationship is there is between the constrained input due to desirable curtage sensor, the linearity is very good, its output waveform can be fed back really to the specified measurement electric current of tested sensor input 10% or 10% specified measuring voltage, therefore current signal amplitude A gets 10% of the specified measurement electric current of tested current sensor, i.e. A=10% I, voltage signal magnitude V gets 10% of the specified measuring voltage of tested voltage sensor, i.e. V=10% U.
In order to the bandwidth of measuring current or voltage sensor, preferred bandwidth test system comprises frequency conversion electric current voltage source module, sample resistance, four-way oscillograph, the connection line of Double-way dc voltage-stabilizing source and necessity, the annexation of this test macro and tested sensor, test philosophy as shown in Figure 1, wherein tested sensor is the current sensor or the voltage sensor that need to carry out bandwidth test, frequency conversion electric current voltage source module can provide ac current signal or the ac voltage signal of direct current and different frequency, sample resistance is used for the output signal of tested sensor being converted to voltage signal for oscillograph collection, wherein the sensor of current-output type connects the sample resistance of Ω level, the sensor of voltage output type connects sample resistance or the direct sample of k Ω level, four-way oscillograph is for monitoring the output signal of frequency conversion electric current voltage source module and tested sensor, wherein CH1, CH2 passage is used for input, the output of monitoring voltage sensor, CH3, CH4 passage is used for input, the output of monitoring current sensor, four-way oscillograph can connect computing machine, and waveform signal is transferred to computing machine analysis.Double-way dc voltage-stabilizing source is used for providing operating voltage to tested sensor.

Claims (5)

1. the bandwidth test method of curtage sensor, the decibel numerical value of the distortion value that described curtage sensor allows is it is characterized in that: the step of measuring current or voltage sensor bandwidth is: be first that the DC current signal of A inputs to tested current sensor by amplitude, or amplitude is that the d. c. voltage signal of V inputs to tested voltage sensor, detects the amplitude Y1 of tested curtage sensor output signal; Then keep current amplitude A or voltage magnitude V constant, change the frequency inputing to the curtage signal of tested curtage sensor, detect the signal amplitude Y2 that tested curtage sensor exports, until Y2 meets time, the frequency F1 inputing to the curtage signal of tested curtage sensor is the bandwidth of tested curtage sensor.
2. the bandwidth test method of curtage sensor according to claim 1, it is characterized in that: described current amplitude A equals 10% of the specified measurement electric current of tested current sensor, and described voltage magnitude V equals 10% of the specified measuring voltage of tested voltage sensor.
3. the bandwidth test system of a curtage sensor, it is characterized in that: described bandwidth test system comprises frequency conversion electric current voltage source module, sample resistance, four-way oscillograph, Double-way dc voltage-stabilizing source, ac current signal or the ac voltage signal of the direct current that frequency conversion electric current voltage source module produces and different frequency input to tested curtage sensor, the output signal of tested sensor is converted to voltage signal for oscillograph collection by sample resistance, the output signal of four-way oscillograph monitoring frequency conversion electric current voltage source module and tested sensor, Double-way dc voltage-stabilizing source provides operating voltage for tested sensor.
4. the bandwidth test system of curtage sensor according to claim 3, is characterized in that: described tested curtage sensor is current-output type sensor, and described tested sensor connects the sample resistance of Ω level.
5. the bandwidth test system of curtage sensor according to claim 3, is characterized in that: described tested curtage sensor is voltage output type sensor, and described tested sensor connects sample resistance or the direct sample of k Ω level.
CN201410485410.XA 2014-09-22 2014-09-22 Bandwidth testing method and system of current or voltage sensor Pending CN104459590A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109782205A (en) * 2017-11-10 2019-05-21 大陆汽车电子(连云港)有限公司 Intelligent battery sensor detector
CN109813951A (en) * 2018-12-26 2019-05-28 中国科学院上海应用物理研究所 A kind of current sensor frequency response bandwidth measuring apparatus and method

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CN102656467A (en) * 2009-12-18 2012-09-05 Sb锂摩托有限公司 Current sensor with a self-test function
CN103529366A (en) * 2013-09-22 2014-01-22 华北电力大学 UHF (Ultra High Frequency) broadband current sensor based on Rogowski coil principle and joint monitoring system

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109782205A (en) * 2017-11-10 2019-05-21 大陆汽车电子(连云港)有限公司 Intelligent battery sensor detector
CN109813951A (en) * 2018-12-26 2019-05-28 中国科学院上海应用物理研究所 A kind of current sensor frequency response bandwidth measuring apparatus and method

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Application publication date: 20150325