WO2015188593A1

WO2015188593A1 - Alternating current and direct current wireless monitoring device

Info

Publication number: WO2015188593A1
Application number: PCT/CN2014/091961
Authority: WO
Inventors: 李福兴; 袁辉
Original assignee: 国网上海市电力公司; 华东电力试验研究院有限公司; 上海勋睿电力科技有限公司
Priority date: 2014-06-12
Filing date: 2014-11-22
Publication date: 2015-12-17
Also published as: CN203881834U

Abstract

An alternating current and direct current wireless monitoring device comprises a spherical cover (4), and a current measuring unit, a signal processing and wireless transmitting unit (6) and a power supply unit (5) that are fixed inside the spherical cover (4). The current measuring unit is a linear Hall sensor (3) capable of measuring alternating current and direct current and outputs an analog current signal, the analog current signal is collected by the signal processing and wireless transmitting unit (6) and is transmitted in a wireless radio-frequency communication mode after digital processing, and the power supply unit (5) provides power for the current measuring unit and the signal processing and wireless transmitting unit (6). A wireless communication module is used for data exchange with an upper computer by the device, the hidden danger posed by the insulation requirement in measuring on a high voltage wire and laying a communication cable can be prevented, and the device is convenient to install, capable of acquiring current on an electrical device at different parts and strong in flexibility.

Description

AC and DC current wireless monitoring device

Technical field

The utility model relates to a wireless monitoring device for alternating current and direct current of electrical equipment, in particular to a wireless monitoring device for AC and DC current.

Background technique

With the advancement of the power system, the electrical equipment gradually transitions from the original periodic maintenance to the state maintenance. The basic state quantity, voltage and current monitoring of the electrical equipment are the normal basis of the monitoring equipment. Currently, the current measurement is generally measured by the current transformer, but This method can only measure AC current. If it is necessary to measure the AC and DC currents, it is necessary to use a Hall transformer and directly connect to the wire. For example, the wire has a high voltage, and the device is expensive and bulky. Therefore, the wireless transmission method can simplify the insulation structure, reduce the volume, and reduce the volume. Cost and easy to install.

For example, there are AC and DC currents in the neutral ground current of the transformer. In order to prevent transformer vibration and noise from increasing due to DC bias, it is necessary to monitor the neutral ground current of the transformer. How to develop a probe to solve the monitoring of the neutral ground current of the transformer And to achieve wireless transmission, this is a technical problem to be solved.

Summary of the invention

The purpose of the utility model is to provide an AC/DC current wireless monitoring device for overcoming the defects of the prior art mentioned above, which solves the safety hazard existing in the prior art mentioned above, monitors the current in real time, and issues an alarm to the abnormality of the electrical equipment in time. At the same time, wireless transmission can simplify the device and improve safety and reliability.

The purpose of the utility model can be achieved by the following technical solutions:

An AC/DC current wireless monitoring device, comprising a spherical cover, further comprising a current measuring unit fixed in the spherical cover, a signal processing and a wireless transmitting unit, and a power supply unit,

The current measuring unit is a linear Hall sensor capable of measuring alternating current and direct current, and outputs an analog current signal.

The signal processing and the wireless transmitting unit collect the analog current signal, and after digital processing, send the signal by wireless radio frequency communication.

The power supply unit supplies power to the current measuring unit and the signal processing and wireless transmitting unit.

The linear Hall sensor has a measurement frequency of 0-20 KHz, a response time of no more than 10 μs, and a linearity of 1%.

The signal processing and wireless transmitting unit has a built-in power management IC with an MCU.

The power management IC with the MCU has an operating current of 2 microamps. After the clock interrupt wakes up, the sensor can be powered and sampled to obtain the effective value of the harmonic current. After the sensor power is turned off, the collected data is sent wirelessly.

The spherical cover is mounted and fixed on a circular wire or a rectangular bus bar according to the shape of the wire.

An insulating fixing jig is disposed in the middle of the spherical cover, and the insulating fixing jig is connected to the spherical cover via an equipotential line.

The insulating fixing fixture is provided with a metal wire fixing clip.

The flow measuring unit is spanned on the insulating fixture.

The outer side of the spherical cover is provided with an antenna for outputting a radio frequency signal.

Compared with the prior art, the utility model uses the wireless communication module to exchange data with the upper computer, which can avoid the safety hazard caused by the measuring device on the high-voltage wire to be insulated and laid the communication cable, and is convenient to install and can be in different parts. Get the current of the electrical equipment, so it is flexible and easy to install.

DRAWINGS

Figure 1 is a schematic exploded view of the utility model;

Figure 2 is a schematic view of the structure of the present invention.

In the figure, 1 is an equipotential line, 2 is an insulating fixing jig, 3 is a Hall sensor, 4 is a spherical cover; 5 is a power supply unit; 6 is a signal processing and wireless transmitting unit, 7 is a metal wire fixing clip, 8 is an antenna 9 is a waterproof seal.

detailed description

The invention will be described in detail below with reference to the drawings and specific embodiments.

Example

An AC/DC current wireless monitoring device, the structure of which is shown in FIG. 1-2, includes a spherical cover 4, and further includes a current measuring unit fixed in the spherical cover, a signal processing and wireless transmitting unit 6, and a power supply unit 5. The current measuring unit is a linear Hall sensor 3 capable of measuring alternating current and direct current, and outputs an analog current signal. The linear Hall sensor 3 used in this embodiment has a measuring frequency of 0-20 KHz, a response time of no more than 10 μs, and a linearity. The degree is 1% and is kept at a fixed distance from the wire to be tested.

The signal processing and wireless transmitting unit 6 collects an analog current signal, which is digitally processed and transmitted by wireless radio frequency communication. The signal processing and wireless transmitting unit 6 uses a low power consumption power management IC with an MCU, and the operating current during sleep is only 2 Micro-amp, after the clock interrupt wakes up, the sensor is powered and sampled to obtain the effective value of the harmonic current. After the sensor power is turned off, the collected data is wirelessly transmitted through the antenna. The spherical cover 4 is mounted and fixed on the circular wire or the rectangular busbar according to the shape of the wire, and cannot be too close to other devices or the grounding body, and the probe casing is in good contact with the wire to be tested through the wire and the metal wire fixing member, so that the probe is The test leads are at the same potential to avoid damage to the internal circuitry of the probe. The probe is attached to the wire and connected in series in the wire loop. The power supply unit 5 is used to provide probe power and power management. An insulating fixing jig 2 is disposed in the middle of the spherical cover 4, and the insulating fixing jig 2 is connected to the spherical cover 4 via the equipotential line 1. A metal wire fixing clip 7 is provided on the insulating fixing jig 2. The Hall sensor 3 is placed across the insulating fixture 2.

After the upper and lower covers of the spherical cover 4 are closed, a waterproof seal 9 is also installed at the exit holes of the wires on both sides to prevent the internal circuit board and the power supply of the probe from being damp. Further, an antenna 8 for outputting a radio frequency signal is provided outside the globe cover 4.

A person skilled in the art should understand that the above embodiments are only for illustrating the present invention, and are not intended to limit the present invention, as long as the spirit of the present invention is within the scope of the spirit of the present invention. Variations, modifications, etc., are intended to fall within the scope of the claims of the invention.

Claims

An AC/DC current wireless monitoring device, comprising a spherical cover, characterized in that it further comprises a current measuring unit fixed in the spherical cover, a signal processing and a wireless transmitting unit, and a power supply unit,

The current measuring unit is a linear Hall sensor capable of measuring alternating current and direct current, and outputs an analog current signal.

The signal processing and the wireless transmitting unit collect the analog current signal, and after digital processing, send the signal by wireless radio frequency communication.

The power supply unit supplies power to the current measuring unit and the signal processing and wireless transmitting unit.
The AC/DC current wireless monitoring device according to claim 1, wherein the linear Hall sensor has a measurement frequency of 0-20 kHz, a response time of no more than 10 μs, and a linearity of 1%.
The AC/DC current wireless monitoring device according to claim 1, wherein the signal processing and wireless transmitting unit has a built-in power management IC with an MCU.
The AC/DC current wireless monitoring device according to claim 3, wherein the power management IC with the MCU has an operating current of 2 microamperes.
The AC/DC current wireless monitoring device according to claim 1, wherein the spherical cover is mounted and fixed on the circular wire or the rectangular bus bar according to the shape of the wire.
The AC/DC current wireless monitoring device according to claim 1, wherein the spherical cover is provided with an insulating fixing jig in the middle, and the insulating fixing jig is connected to the spherical cover via an equipotential line.
The AC/DC current wireless monitoring device according to claim 6, wherein the insulating fixing fixture is provided with a metal wire fixing clip.
The AC/DC current wireless monitoring device according to claim 6, wherein the flow measuring unit is disposed across the insulating fixture.
The AC/DC current wireless monitoring device according to claim 1, wherein an outer side of the spherical cover is provided with an antenna for outputting a radio frequency signal.