Wide band high voltage intelligent electric resistance partial pressure type voltage sensor

A technology of voltage sensor and resistor voltage division, applied in the direction of inductors, transformers, voltage/current isolation, etc., to achieve low temperature drift, easy calibration, and wide test range

Inactive Publication Date: 2008-10-15
徐伟专
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, a resistive voltage divider has not been used to replace the traditional transformer for the voltage sensor of the variable frequency AC high voltage test

Method used

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  • Wide band high voltage intelligent electric resistance partial pressure type voltage sensor
  • Wide band high voltage intelligent electric resistance partial pressure type voltage sensor
  • Wide band high voltage intelligent electric resistance partial pressure type voltage sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: refer to figure 1 and figure 2 :

[0024] This embodiment includes a resistive voltage divider (1) for extracting voltage signals from the measured voltage circuit, a high-voltage side signal processing device (2), a high-voltage side power supply (3), a high-voltage isolation transformer (4), and a communication optical fiber group ( 5), the digital display terminal (6) on the low-voltage side.

[0025] In this embodiment, the low-voltage side power supply grid adopts AC220V mains power.

[0026] The resistive voltage divider (1) is used as a voltage sensing device, and the analog voltage signal after the voltage division of the measured voltage signal connected to both ends of V+ and V- is connected to the high-voltage side signal processing device (2), and the high-voltage side signal processing device ( 2) Convert the analog voltage signal output by the resistive voltage divider (1) into a digital signal and upload it to the digital display termina...

Embodiment 2

[0036] Refer to attached image 3 : (The figure omits the connection with figure 2 The same resistive voltage divider 1, high-voltage side power supply 3, and high-voltage isolation transformer 4) in the same embodiment, the difference between this embodiment and embodiment 1 is that the wide-band high-voltage intelligent resistor divider voltage sensor in this embodiment does not care about the measured signal Sampling time, that is, no need for synchronous sampling or phase comparison with other signals, the high-voltage side signal processing device (2) saves the sampling clock receiver 2A, the communication fiber group (5) saves the communication fiber 5A, and the low-voltage side digital display The terminal (6) omits the sampling clock transmitter 6A, and simultaneously 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 provides the sampling clock signal.

Embodiment 3

[0038] Refer to attached Figure 4 : (The figure omits the connection with figure 2 The same resistive voltage divider 1, high-voltage side power supply 3, and high-voltage isolation transformer 4) in the same embodiment, the difference between this embodiment and embodiment 1 is that in this embodiment, the broadband high-voltage intelligent resistance divider voltage sensor does not need to set various instructions , the solid high-voltage side signal processing device (2) can save the serial data receiver 2B, the communication fiber group (5) can save the communication fiber 5B, and the low-voltage side digital display terminal (6) can save the serial data transmitter 6B .

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Abstract

The invention discloses a broadband high-voltage intelligent resistance voltage-division voltage sensor, which consists of the following components: a resistance type voltage divider (1) used to pick voltage signal from a measured voltage circuit, a high-voltage side signal processing device (2) used to convert the analog voltage signal output from the resistance type voltage divider (1) into digital signal and carry out operation processing, a set of communication optical fibers (5) connecting the high-voltage side signal processing device (2) and a low-voltage side digital display terminal (6), a high-voltage side electric source (3) providing working electric source for the high-voltage side signal processing device (2) and a high-voltage isolating transformer (4) connecting the high-voltage side electric source (3) and a low-voltage side power supply electric network. The broadband high-voltage intelligent resistance voltage-division voltage sensor has wide frequency response scope, AC/DC commonality, wide effective testing scope, no magnetic saturation problem, high measuring precision, high voltage resistance, high linearity, low temperature drift, easy calibration and strong anti-interference capability, and is suitable to be used in places such as an electric motor manufacturing enterprise and an electric motor research and detection center, etc.

Description

technical field [0001] The invention relates to a wide-frequency high-voltage intelligent resistance-dividing voltage sensor used for AC / DC and variable-frequency motor measurement. 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. 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 divider...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R15/18H01F38/24
Inventor 徐伟专廖仲篪
Owner 徐伟专
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