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Wide band high pressure intelligent resistance type current sensor

A current sensor and resistive technology, which is applied in the field of broadband high-voltage intelligent resistive current sensor, can solve problems such as interference, affecting test accuracy, and long signal transmission lines, achieving low-temperature drift, strong anti-interference ability, and no secondary open-circuit high voltage dangerous effect

Inactive Publication Date: 2008-07-30
徐伟专
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 pressure intelligent resistance type current sensor
  • Wide band high pressure intelligent resistance type current sensor
  • Wide band high pressure intelligent resistance type current sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: With reference to Fig. 1 and Fig. 2:

[0024] In this embodiment, the low-voltage side power supply grid adopts AC220V mains power.

[0025] As a current sensing device, the shunt (1) is connected to both ends of the measured current loop I+ and I-, and converts the measured current into a millivolt-level analog voltage signal and connects it to the high-voltage side signal processing device (2), and the high-voltage side signal processing The device (2) converts the analog voltage signal output by the shunt (1) into a digital signal and uploads it to the low-voltage side digital display terminal (6) through the optical fiber group (5) after calculation and processing, and the high-voltage side power supply (3) is the high-voltage side signal The processing device (2) provides working power, and the primary side and the secondary side of the high-voltage isolation transformer (4) are respectively connected to the AC220V mains power supply and the high-volt...

Embodiment 2

[0036] With reference to accompanying drawing 3: (omit among the figure 2 identical shunt 1, high-voltage side power supply 3, high-voltage isolation transformer 4), the difference of this embodiment and embodiment 1 is, in the present embodiment, broadband high-voltage smart resistance The current sensor does not care about the sampling time of the measured signal, that is, it does not need to sample synchronously with other signals or perform phase comparison, so the high-voltage side signal processing device (2) saves the sampling clock receiver 2A, and the communication optical fiber group (5) saves The communication optical fiber 5A, the low-voltage side digital display terminal (6) saves 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, The sampling clock signal is provided by IC2.

Embodiment 3

[0038] With reference to accompanying drawing 4: (omit among the figure 2 same shunt 1, high-voltage side power supply 3, high-voltage isolation transformer 4), the difference between this embodiment and embodiment 1 is, in the present embodiment, broadband high-voltage smart resistance The current sensor does not need to set various instructions, so the high-voltage side signal processing device (2) saves the serial data receiver 2B, the communication fiber group (5) saves the communication fiber 5B, and the low-voltage side digital display terminal (6) saves the serial data row data transmitter 6B.

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Abstract

The invention discloses a broadband high-voltage intelligent resistive electric current sensor, which comprises the following components: a current diverter (1) for extracting voltage signal from a detected current circuit, a high-voltage side signal processing device (2) for converting an analog voltage signal output from the current diverter (1) to a digital signal and performing arithmetic processing, a communication optical fiber assembly (5) connected with the high-voltage side signal processing device (2) and a low-voltage side digital display terminal (6), a high-voltage side power supply (3) for supplying working power supply to the high-voltage side signal processing device (2), and a high-voltage isolation transformer (4) connected with the high-voltage side power supply (3) and a low-voltage side power supply electric network. The invention has the advantages of wide frequency response, alternating current / direct current universality, wide effective measurement range, no saturation magnetization problem, high measurement accuracy, high withstand voltage, high linearity, low temperature drift, easy calibration, high resistance to jamming, and no high-voltage risk of secondary circuit opening; The invention is suitable for motor production enterprises, motor research and detection centers.

Description

technical field [0001] The invention relates to a wide-band high-voltage intelligent resistive current 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. Shunts, especially belt-folded shunts, disc shunts, coaxial shunts, etc., have good frequency characteristics, but because the output is not isolated, flat-plate shunts are generally used for DC current testing at present, while folded-band shunts Shunts, disc shunts, and coaxial shunts are generally used for pulse current or impulse current testing, and their common feature is that one end of the test is connected to the ground. In a...

Claims

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Application Information

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IPC IPC(8): G01R19/25G01R15/00G08C23/06
Inventor 徐伟专廖仲篪
Owner 徐伟专
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