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Three-phase current wireless detection device

A three-phase current and wireless detection technology, which is applied in the direction of measurement, signal transmission system, and instrumentation using digital measurement technology, can solve the problems of inconvenient maintenance, easy interference of long-distance transmission, complex structure, etc., and achieve simple structure, Increase reliability and overcome high cost

Inactive Publication Date: 2015-05-20
BEIHUA UNIV
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  • Claims
  • Application Information

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Problems solved by technology

This kind of device is not only complicated in structure, but also susceptible to interference during long-distance transmission and inconvenient to maintain.

Method used

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  • Three-phase current wireless detection device
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Embodiment Construction

[0009] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0010] refer to figure 1 , a three-phase current wireless detection device of the present invention includes a three-phase current detection circuit 10 and an intelligent wireless transmission circuit 20 . The two current transformers of the three-phase current detection circuit 10 are Delixi current transformers LMK-0.66 250 / 5 available in the market. The two current transformers are respectively installed on the A-terminal line and the C-terminal line, among which: pin 1 and pin 2 output the detection current of the A-terminal line and the C-terminal line, and pin 3 and pin 4 are connected, according to Kirchhoff According to the current law, ic=-(ia+ib), that is, the output of the 3-pin and 4-pin connection is the detection current of the B-terminal line. The detection current of A, B, and C terminals is input to diode D1, diode D3, diode D5, and t...

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Abstract

The invention discloses a three-phase current wireless detection device. The device is characterized by comprising a three-phase current detection circuit and an intelligent wireless transmitting circuit, wherein current transformers are arranged on any two phases of a three-phase symmetric circuit to measure current effective values of the two phases; certain ends of the two current transformers are connected to the corresponding two phases of a three-phase rectifier bridge respectively, and the other end is connected to the third phase of the three-phase rectifier bridge; output of the three-phase rectifier bridge is an average value of the current of the three-phase symmetric circuit; the current average value is converted into a voltage signal of 0-5 V through a filter conversion circuit; the voltage signal of 0-5 V is converted into a corresponding digital signal by the intelligent wireless transmitting circuit and is wirelessly transmitted to a monitor. The circuit is simplified, the stability of the system is enhanced, and the maintenance is easy.

Description

technical field [0001] The invention relates to the technical field of wireless sensors, in particular to a three-phase current wireless detection device. Background technique [0002] The three-phase current is one of the important parameters of the three-phase circuit. At present, three sets of current sensors are used for three-phase current detection, which are respectively installed on the three terminal lines of the three-phase circuit for measurement, and the detected analog quantities are uploaded through wires. This kind of device is not only complicated in structure, but also susceptible to interference during long-distance transmission and inconvenient to maintain. Contents of the invention [0003] The technical problem to be solved by the present invention is: take Kirchhoff's current law as the theoretical basis, simplify the current detection circuit, and add a wireless transmission circuit to replace the original wired transmission. The present invention u...

Claims

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Application Information

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IPC IPC(8): G01R19/25G08C17/02
Inventor 周振雄孙继元曲永印苑广军郭丽
Owner BEIHUA UNIV
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