CN110554266A - Low-voltage branch line platform area identification instrument - Google Patents

Abstract

The invention discloses a low-voltage branch line platform area identifier, which belongs to the field of power distribution detection products and comprises an acquisition end, a divider resistance sampling circuit, a data processor, a power circuit, a single chip microcomputer, a signal lamp, a key circuit, a USB interface and a GPRS communication module, wherein the acquisition end and the divider resistance sampling circuit are respectively connected with the data processor; the data processor and the power circuit are respectively connected with the single chip microcomputer; the key circuit, the signal lamp and the USB interface are respectively connected with the singlechip; and the GPRS communication module is connected with the USB interface. The invention has reasonable design, simple structure, firmness and stability, can detect a plurality of lines simultaneously, is not influenced by the detection lines, and greatly improves the working efficiency of detection personnel.

Description

low-voltage branch line platform area identification instrument

Technical Field

The invention relates to a low-voltage branch line station area recognition instrument, and belongs to the field of power distribution detection products.

Background

In recent years, in order to achieve marketing fine management and achieve the purposes of reducing consumption and reducing loss, a power grid company often needs to collect more user data of various transformer areas, including transformer area information and phase information of a user meter, so that new requirements are provided for a low-voltage centralized meter reading system.

The existing transformer area identification instrument has signal interference and errors in actual detection through a method of coupling current signals, inaccurate detection and wrong judgment exist when the current transformer area identification instrument passes through a plurality of switches and nodes, and misjudgment is brought to the detection process due to the fact that the existing current comparison identification instrument has asynchronous time.

Disclosure of Invention

according to the defects in the prior art, the problems to be solved by the invention are as follows: the pressure branch line platform area identification instrument is reasonable in design, simple in structure, firm and stable, and can solve the problems.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention provides a low-voltage branch line station area identifier, which comprises an acquisition end, a divider resistance sampling circuit, a data processor, a power circuit, a single chip microcomputer, a signal lamp, a key circuit, a USB interface and a GPRS communication module, wherein the acquisition end and the divider resistance sampling circuit are respectively connected with the data processor; the data processor and the power circuit are respectively connected with the single chip microcomputer; the key circuit, the signal lamp and the USB interface are respectively connected with the singlechip; and the GPRS communication module is connected with the USB interface.

As a preferred scheme, the acquisition end detects current signals of an electric load to be detected, the acquisition end comprises two stages of current transformers, wherein the first stage is an 200/5A pincerlike transformer, the pincerlike transformer sends acquired signals into the second stage which is a 5/25MA secondary transformer, and the data processor acquires signals of the secondary transformer for processing.

As a preferred scheme, the data processor comprises an AD sampling chip and a DSP module which are connected in sequence; and the acquisition end sends the current signal to an AD sampling chip of the data processor.

As a preferable scheme, the voltage-dividing resistance sampling circuit detects a voltage-dividing resistance signal of the electric load to be detected, and sends the voltage-dividing resistance signal to an AD sampling chip of the data processor.

As a preferred scheme, the AD sampling chip collects input waveforms of a current signal and a divider resistance signal, performs analog-to-digital conversion on the input waveforms of the current signal and the divider resistance signal, and sends the converted input waveforms to the DSP module; the DSP module outputs a data processing result to the single chip microcomputer after the received current signal after analog-to-digital conversion and the divider resistance signal are subjected to Fourier transform, dynamic tracking and root mean square value operation in sequence.

As a preferable scheme, the single chip microcomputer detects according to a received data processing result and transmits the detection result to a server through a GPRS network, and the server displays data on the mobile phone client.

The invention has the beneficial effects that:

The invention has small volume and convenient carrying, can detect a plurality of lines simultaneously, is not influenced by the detected lines, greatly improves the working efficiency of detection personnel, adopts the port voltage of the GPRS chip (AIR202) to be 1.8V, so that two triodes are adopted for voltage matching at the receiving and sending I/O ports of a serial port, and the GPRS chip is responsible for networking and information transmission, is simple and convenient, adopts the pincerlike mutual inductor to detect current conveniently and quickly, is not limited by the environment, adopts an app transmission mode to acquire data, and brings convenience and rapidness.

Drawings

FIG. 1 is a schematic view of the structural connection of the present invention;

FIG. 2 is a diagram of a minimum system of a GPRS chip of the present invention;

FIG. 3 is a diagram of an embodiment of the present invention;

Detailed Description

example 1:

Referring to the attached drawings of the specification, the low-voltage branch line station area identifier comprises an acquisition end, a divider resistor sampling circuit, a data processor, a power circuit, a single chip microcomputer, a signal lamp, a key circuit, a USB interface and a GPRS communication module, wherein the acquisition end and the divider resistor sampling circuit are respectively connected with the data processor; the data processor and the power circuit are respectively connected with the single chip microcomputer; the key circuit, the signal lamp and the USB interface are respectively connected with the singlechip; and the GPRS communication module is connected with the USB interface.

As a preferred scheme, the acquisition end detects current signals of an electric load to be detected, the acquisition end comprises two stages of current transformers, wherein the first stage is an 200/5A pincerlike transformer, the pincerlike transformer sends acquired signals into the second stage which is a 5/25MA secondary transformer, and the data processor acquires signals of the secondary transformer for processing.

as a preferred scheme, the data processor comprises an AD sampling chip and a DSP module which are connected in sequence; and the acquisition end sends the current signal to an AD sampling chip of the data processor.

As a preferable scheme, the voltage-dividing resistance sampling circuit detects a voltage-dividing resistance signal of the electric load to be detected, and sends the voltage-dividing resistance signal to an AD sampling chip of the data processor.

As a preferred scheme, the AD sampling chip collects input waveforms of a current signal and a divider resistance signal, performs analog-to-digital conversion on the input waveforms of the current signal and the divider resistance signal, and sends the converted input waveforms to the DSP module; the DSP module outputs a data processing result to the single chip microcomputer after the received current signal after analog-to-digital conversion and the divider resistance signal are subjected to Fourier transform, dynamic tracking and root mean square value operation in sequence.

As a preferable scheme, the single chip microcomputer detects according to a received data processing result and transmits the detection result to a server through a GPRS network, and the server displays data on the mobile phone client.

the invention mainly utilizes the principle that the current on the same wire is equal at the same time as the detection standard, and the method can simultaneously detect a plurality of lines without the limitation of the detection line and can greatly improve the detection efficiency. When in operation, the open pincerlike mutual inductor is directly clamped on a tested circuit, so that the operation is safe and convenient. Meanwhile, the volume is small, and the carrying is convenient.

The invention has small volume and convenient carrying, can simultaneously detect a plurality of lines, is not influenced by the detection lines, and greatly improves the working efficiency of detection personnel.

The invention is divided into an acquisition end and a processing end, wherein the acquisition end is divided into two stages of mutual inductance, the first stage is 200/5A, the second stage is 5/25ma, and the processing end calculates and processes information acquired by a secondary mutual inductor to obtain acquired actual current. And then sent to the background over the 2G network.

The using method comprises the following steps:

(1) firstly, turning on a power switch;

(2) When the signal lamp begins to flash rapidly, the equipment is proved to start working;

(3) Placing a current clamp on a wire to be detected, and collecting a current signal;

(4) Acquiring and converting through two-stage mutual inductance adc, and then calculating actual current according to a proportional relation;

(5) Sending the obtained actual current to a server through a serial port, and displaying data on an APP by the server;

(6) the user looks up the obtained signal through the mobile phone APP.

The invention has small volume and convenient carrying, can detect a plurality of lines simultaneously, is not influenced by the detected lines, greatly improves the working efficiency of detection personnel, adopts the port voltage of the GPRS chip (AIR202) to be 1.8V, so that two triodes are adopted for voltage matching at the receiving and sending I/O ports of a serial port, and the AIR202 chip is responsible for networking and information transmission, is simple and convenient, adopts the pincerlike mutual inductor to detect current conveniently and quickly, is not limited by the environment, adopts an app transmission mode to acquire data, and brings convenience and rapidness.

The control chip adopts an STM32 series single chip microcomputer, the GPRS chip for remote transmission and control adopts an AIR202 module, the AIR202 module is a four-frequency-band GSM/GPRS module, an RDA8955 platform is adopted, a 32Mb NorFlash +32Mb SRAM is built in, and three development modes such as a Lua script development mode, an AT command development mode and a C language SDK development mode are supported.

The Air202 has rich peripheral interfaces, supports various interfaces such as UART, SPI, I2C and the like, can support 16 GPIOs at most, supports ADC and audio input and output functions, and meets the use requirements of various application scenes.

The Air202 module adopts a power saving technology, and the current power consumption is as low as 1.14mA in the sleep mode DRX-5. The voltage of the AIR202 port is 1.8V, so that two triodes are adopted to match the voltage at the receiving and sending I/O ports of the serial port, and the AIR202 is responsible for networking and information transmission, and is simple and convenient.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (6)

1. The low-voltage branch line station area identifier is characterized by comprising an acquisition end, a divider resistor sampling circuit, a data processor, a power circuit, a single chip microcomputer, a signal lamp, a key circuit, a USB interface and a GPRS communication module, wherein the acquisition end and the divider resistor sampling circuit are respectively connected with the data processor; the data processor and the power circuit are respectively connected with the single chip microcomputer; the key circuit, the signal lamp and the USB interface are respectively connected with the singlechip; and the GPRS communication module is connected with the USB interface.

2. The low-voltage branch line station area identifier according to claim 1, wherein the collection terminal detects a current signal of an electric load to be detected, the collection terminal comprises a two-stage current transformer, the first stage is an 200/5A pincerlike transformer, the pincerlike transformer sends the collected signal to a second stage which is a 5/25MA secondary transformer, and the data processor collects the signal of the secondary transformer for processing.

3. The low-voltage branch line station area identifier according to claim 1, wherein the data processor comprises an AD sampling chip and a DSP module which are connected in sequence; and the acquisition end sends the current signal to an AD sampling chip of the data processor.

4. the apparatus as claimed in claim 3, wherein the divider resistance sampling circuit detects a divider resistance signal of the electric load to be detected and sends the divider resistance signal to the AD sampling chip of the data processor.

5. The identification instrument for the transformer area of the low-voltage branch line according to claim 3, wherein the AD sampling chip collects input waveforms of a current signal and a divider resistance signal, performs analog-to-digital conversion on the input waveforms of the current signal and the divider resistance signal, and sends the converted input waveforms to the DSP module; the DSP module outputs a data processing result to the single chip microcomputer after the received current signal after analog-to-digital conversion and the divider resistance signal are subjected to Fourier transform, dynamic tracking and root mean square value operation in sequence.

6. The low-voltage branch line station area identifier according to claim 1, wherein the single chip microcomputer processes the result of the received data to detect the data and transmits the detection result to the server through a GPRS network, and the server displays the data on the mobile phone client.