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Electric energy meter and current sampling device thereof

A technology of current sampling and electric energy meter, applied in the direction of measuring device, shielding device, measuring electric variable, etc., can solve the problems of insufficient resistance, error and loss of accuracy of electric energy measuring tools such as electric energy meter, etc. resistance, the effect of improving the current sampling error

Inactive Publication Date: 2013-01-02
俞敏
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To sum up, in the prior art, manganin shunts have insufficient resistance to alternating magnetic fields during operation, and are easily affected by internal or external alternating magnetic fields, thereby causing large errors in electric energy measurement tools such as electric energy meters , thus losing accuracy

Method used

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  • Electric energy meter and current sampling device thereof
  • Electric energy meter and current sampling device thereof
  • Electric energy meter and current sampling device thereof

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Embodiment Construction

[0031] See figure 1 , figure 1 is a schematic structural diagram of the current sampling device according to the first embodiment of the present invention. In this embodiment, the current sampling device 10 includes a sampling resistor base 11, an isolation mechanism 12, a first connection part 13, a second connection part 14, a first wire 15, a second wire 16, a wire base 17, a shield 18 and The third wire 19.

[0032] The first connecting portion 13 and the second connecting portion 14 are respectively disposed on two sides of the sampling resistor base 11 . One end of the first wire 15 is connected to the first connection part 13 , one end of the second wire 16 is connected to the second connection part 14 , and the other ends of the first wire 15 and the second wire 16 are connected to the input port of the metering circuit. Specifically, the current sampling device 10 of the present embodiment is a manganin shunt, the sampling resistor base 11 is a manganin resistor bo...

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Abstract

The invention provides an electric energy meter and a current sampling device thereof. The current sampling device comprises a sampling resistor body, a first lead, a second lead and an isolating mechanism used for isolating heat, wherein two sides of the sampling resistor body are respectively provided with a first connection part and a second connection part; one end of the first lead is connected with the first connection part, and one end of the second lead is connected with the second connection part. The first lead or the second lead extends from the surface of the sampling resistor body so as to divide the sampling resistor body into two regions with equal effective magnetic flux areas; and the two leads extends in parallel or in partially spiral twisting. The isolating mechanism is used for isolating heat between the first lead, the second lead and the sampling resistor body. By the means, the current sampling device has higher resistance on interference of an alternating magnetic field, so that the current sampling error caused by induced current generated by internal or external magnetic fields is effectively improved; and due to the adoption of the isolating mechanism, the problem of burning out the leads caused by overheat of the sampling resistor body is effectively prevented.

Description

technical field [0001] The invention relates to the field of electric energy metering products, in particular to an electric energy meter and a current sampling device thereof. Background technique [0002] A shunt is a device for measuring current and is widely used in voltage or current sampling and detection in electronics, communications, and industrial production. Existing shunts are generally manganin shunts, and a sampling wire is used to convert the current flowing through the manganin shunt into a voltage for sampling. [0003] The signal sampling accuracy of the shunt is easily disturbed and deteriorated. For example, in the electric energy meter, the interference to the sampling unit can be divided into two parts: internal interference source and external interference source, and the internal interference source is mainly transformer leakage flux , the external interference source comes from the magnetic field outside the electric energy meter. As mentioned abov...

Claims

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Application Information

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IPC IPC(8): G01R11/02G01R1/18
Inventor 俞敏
Owner 俞敏
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