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Wide band high voltage intelligent resistance type voltage current combined sensor

A combined sensor, voltage and current technology, applied in the direction of voltage/current isolation, inductors, transformers, etc., can solve the problems of long signal transmission lines, interference, and affecting test accuracy, so as to achieve no secondary open circuit high voltage danger, low temperature drift, Strong anti-interference ability

Inactive Publication Date: 2010-01-27
徐伟专
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the small amplitude of the signal output by the shunt, the corresponding voltage signal is generally less than 250mV at the rated current, while the traditional method of separating the sensor from the instrument results in a long signal transmission line, and the signal is easy to transmit during long-distance transmission. Introduce various disturbances and affect the test accuracy

Method used

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  • Wide band high voltage intelligent resistance type voltage current combined sensor
  • Wide band high voltage intelligent resistance type voltage current combined sensor
  • Wide band high voltage intelligent resistance type voltage current combined sensor

Examples

Experimental program
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Embodiment 1

[0026] Embodiment 1: refer to figure 1 and figure 2 :

[0027] This embodiment includes a resistive voltage divider (1) for extracting voltage signals from the measured voltage loop, a shunt (2) for extracting millivolt-level voltage signals from the measured current loop, and a high-voltage side signal processing device (3) , a high-voltage side power supply (4), a high-voltage isolation transformer (5), a communication optical fiber group (6), and a low-voltage side digital display terminal (7).

[0028] In this embodiment, the low-voltage side power supply grid adopts AC220V mains power.

[0029] The analog voltage signal output by the resistive voltage divider (1) and the shunt (2) is connected to the high-voltage side signal processing device (3), and the high-voltage side signal processing device (3) connects the resistive voltage divider (1) and the shunt (2) The output analog voltage signal is converted into a digital signal and uploaded to the low-voltage side dig...

Embodiment 2

[0041] Refer to attached image 3 : (The figure omits the connection with figure 2 The same resistive voltage divider 1, shunt 2, high-voltage side power supply 4, and high-voltage isolation transformer 5) in this embodiment, the difference between this embodiment and embodiment 1 is that the broadband high-voltage intelligent resistive voltage-current combined sensor in this embodiment does not Concerned about the sampling time of the signal under test, that is, no synchronous sampling or phase comparison with other signals is required, so the high-voltage side signal processing device (3) omits the sampling clock receiver 3A, and the communication optical fiber group (6) omits the communication optical fiber 6A, The low-voltage side digital display terminal (7) saves the sampling clock transmitter 7A, and at the same time connects the A / D conversion start signal CONVSTA of the A / D converter IC1 directly to the clock output pin OC1A of the microprocessor IC2, and IC2 provide...

Embodiment 3

[0043] Refer to attached Figure 4 : (The figure omits the connection with figure 2 The same resistive voltage divider 1, shunt 2, high-voltage side power supply 4, high-voltage isolation transformer 5), the difference between this embodiment and embodiment 1 is that the broadband high-voltage intelligent resistive voltage-current combination sensor in this embodiment does not need Various instructions are set, so the high-voltage side signal processing device (3) can save the serial data receiver 3B, the communication fiber group (6) can save the communication fiber 6B, and the low-voltage side digital display terminal (7) can save the serial data receiver 3B. Data transmitter 7B.

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Abstract

The invention discloses a wide frequency high voltage intelligent resistance type voltage current combination sensor, comprising a resistance type voltage divider (1) for extracting the voltage signal from the measured loop, a diverter (2) for extracting the voltage signal of the millivolt level from the measured current loop, a high voltage side signal processing device (3) for transmitting the analog voltage signal output by the resistance type voltage divider (1) and the diverter (2) into the digital signals for operation process, a communication optical group (6) for connecting the high voltage side signal processing device (3) and the low voltage side digital display terminal (7), a high voltage side power (4) for providing the working power to the high voltage side signal processing device (3), a high voltage insulation transformer (5) for connecting the high voltage side power (4) and the low voltage side power supply electric network. The invention has high measurement accuracy, high linearity, a low temperature shift, easy calibration, high insulation voltage and strong anti-jamming ability.

Description

technical field [0001] The invention relates to a wide-band high-voltage intelligent resistive voltage-current combined sensor for measuring AC / DC and variable-frequency motors. Background technique [0002] With the development of frequency conversion technology, frequency conversion motors have been widely used. Due to the wide output frequency range of the frequency conversion power supply for power conversion motors and complex high-order harmonics, traditional transformers can no longer meet the electrical parameter tests. [0003] The test frequency range of the Hall voltage sensor is wide, which can better meet the fundamental voltage test of the variable frequency motor, but the current test bandwidth is usually less than 15kHz, especially the test bandwidth of the Hall voltage sensor above 3000V voltage level is usually less than 5kHz, for frequency conversion The higher harmonics of the motor voltage signal still cannot be accurately measured. Resistive voltage di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F38/34G01R15/18
Inventor 徐伟专廖仲篪
Owner 徐伟专
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