Frequency model-based over-range measurement method for magnetically modulated sensors
A measurement method and magnetic modulation technology, applied in the direction of measurement using digital measurement technology, can solve the problems of insulation measurement and positioning failure, exceeding the sensor measurement range, DC sensor saturation, etc., achieving simple method, expanded range, and high measurement accuracy Effect
Active Publication Date: 2021-11-02
NAVAL UNIV OF ENG PLA
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[0003] Due to the increasing emphasis on power supply reliability, many DC loads are powered by dual power supplies. When the voltages of the two power supplies are not equal, parallel power supply will generate circulating current in the system. measurement range, resulting in the failure of insulation measurement and positioning
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[0012] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not constitute a conflict with each other.
[0013] The schematic diagram of the self-excited oscillation magnetic modulation sensor circuit is as follows figure 1 As shown, the self-excited oscillation method is used to generate an excitation square wave in the sensor core, and the measured current is calculated by measuring the duty cycle of the output voltage waveform or the average value of the output current. Usually, the measured current is related to the duty cycle or the average value of the current Propor...
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The invention discloses a method for measuring the overrange of a magnetic modulation sensor based on a frequency model. The process is: establish the corresponding relationship between the measured current and the frequency or period of the oscillating square wave voltage, draw the current-frequency or period curve by fitting according to the established corresponding relationship, and use the interpolation method to obtain each frequency on the current-frequency or period curve Or the current value corresponding to the cycle, measure the actual frequency of the oscillating square wave voltage or the size of the cycle to get the size of the measured current. The present invention measures the current size exceeding the range of the original current sensor by measuring the oscillation voltage frequency (period) of the self-excited oscillating magnetic modulation sensor. For the current sensor based on the duty ratio model, there is no need to change the hardware circuit and only need to add a small amount of programs. The expansion of the measuring range of the sensor can be realized, the method is simple, and the measurement accuracy is high.
Description
technical field [0001] The invention belongs to the technical field of current measurement, and in particular relates to a method for measuring an overrange of a magnetic modulation sensor based on a frequency model. Background technique [0002] More and more power systems use DC power supply, and the cables in the DC power system have the risk of aging and damage. In order to avoid potential safety hazards, insulation monitoring devices for real-time monitoring of system insulation are usually installed. The measurement of insulation monitoring devices relies on DC current The sensor judges the insulation condition by detecting the magnitude of the current. [0003] Due to the increasing emphasis on power supply reliability, many DC loads are powered by dual power supplies. When the voltages of the two power supplies are not equal, parallel power supply will generate circulating current in the system. The measurement range is too small, resulting in the failure of insulat...
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IPC IPC(8): G01R19/25
CPCG01R19/25
Inventor 罗宁昭杨锋张挺张尧
Owner NAVAL UNIV OF ENG PLA