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Novel precision shunt

A shunt, precision technology, applied in the direction of instruments, measuring devices, measuring electrical variables, etc., can solve the problems of difficult to break through the range, large temperature rise, large resistance, etc., achieve wide measurement range, improve measurement accuracy, and good heat dissipation Effect

Active Publication Date: 2017-03-22
BEIJING DONGFANG MEASUREMENT & TEST INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Common shunt structures in the prior art include coaxial cylindrical shunts and cage shunts with PCB structure. However, the resistance of coaxial cylindrical shunts is difficult to be compared with The pre-set resistance is the same; and the PCB structure cage shunt, due to the thickness of the copper, has a large resistance, which makes the temperature rise during use, and its measuring range is difficult to exceed 100A

Method used

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specific Embodiment approach

[0031] Taking the measurement of the pulse current source standard of 1kA as an example, the structural parameters of the shunt that can be used are: 8 pairs of cages inside and outside, the radius of the cage is 1mm, the length of the outer cage is 105mm, the length of the inner cage is 80mm, and the conductor material is constantan , and its nominal resistance is about 1.5mΩ.

[0032] In use, the current input and output can be connected to the first conductive plate 4 and the second conductive plate 5 of the shunt through a radio frequency level coaxial connector, and the voltage measurement can be performed by measuring the potential difference between the central wire 8 and the third conductive plate 7 Obtained, the voltage is about 1.5V.

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Abstract

The invention discloses a novel precision shunt. The novel precision shunt is characterized in that a shunt adopts a double-layer cage-shaped structure, and comprises an outer cage hurdle and an inner side cage hurdle, and in addition, the outer cage hurdle and the inner cage hurdle are in a coaxial arrangement. By adopting the above mentioned structure, parasitic capacitance is small, span is large, and parameters are designable and adjustable.

Description

technical field [0001] The invention relates to a current measuring device, in particular to a novel precision current measuring shunt. Background technique [0002] Current measurement technology is a basic science and technology, which is widely used in various fields of national production. The main methods of current measurement are: shunt, current transformer, Rogowski coil, Hall current sensor, photoelectric sensor and other methods. Among them, the shunt uses Ohm's law to convert the wide-band large current into a small voltage that is easy to measure accurately. The current value is calculated by measuring the voltage on the shunt and the resistance of the shunt. The principle is intuitive, the accuracy is high, and the response speed is fast. It is the simplest. The direct method is widely used in the field of current measurement. [0003] Common shunt structures in the prior art include coaxial cylindrical shunts and cage shunts with PCB structure. However, the r...

Claims

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Application Information

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IPC IPC(8): G01R15/00
CPCG01R15/00
Inventor 王书强李亚禄崔绍颖陈少华宋佳赟
Owner BEIJING DONGFANG MEASUREMENT & TEST INST
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