CN201382970Y - Ultra-high voltage transmission line lightning full parameter measurement system - Google Patents

Abstract

The utility model relates to an ultra-high voltage transmission line lightning full parameter measurement system, which adopts a power supply, a plurality of current sensors, and a plurality of current sensors are respectively connected with a lightning strike signal sampling unit, a data receiving unit, and a GPRS and BT transmission unit; the power supply is provided by a storage battery , solar panels and voltage converters, the batteries are connected to the solar panels and voltage converters respectively; the DC power supply supplies power for the lightning signal sampling unit, data receiving and GPRS, BT transmission unit respectively; data receiving and GPRS, BT transmission The unit sends the lightning current signals collected by each channel to the Internet network through the antenna, and stores them in the FTP server; after the user terminal is connected to the Internet network, it can directly call the stored data in the FTP server. The advantage is that the measurement range is wide, and the fully digital data processing meets the needs of multiple lightning records, facilitates real-time monitoring and sharing of data, realizes fast and accurate positioning of lightning strike lines, and ensures long-term normal operation of measuring equipment.

Description

Ultra-high voltage transmission line lightning full parameter measurement system

technical field

The utility model relates to a measurement system for lightning current parameters of transmission lines, in particular to a measurement system for lightning full parameters of ultra-high voltage transmission lines, which is suitable for the judgment and analysis of lightning strike forms and flashover paths of overhead transmission lines and the analysis of lightning current parameters and Waveform measurements.

Background technique

Every year, lightning accidents on ultra-high voltage transmission lines are very prominent in the operation of the power grid. With the rapid increase of the length of the line, the number of lightning tripping accidents on the line has increased significantly. There is no clear criterion for shielding and counterattack, and it is very difficult to find the fault point, especially in mountainous and high-altitude areas. The lightning phenomenon is extremely complex, and the commonly used electrical geometric method (EGM) gives an overly optimistic estimate of the lightning shielding performance of the line, which has a large deviation from the actual situation. As far as the applicant knows, since the lightning current can range from a few kA to hundreds of kA in actual conditions, and the direction of the lightning strikes also changes greatly, the protection effect of the same protection system on different lightning strikes is very different. Due to the complex and changeable terrain and meteorological factors, transmission lines often have protection failures in certain sections, which become vulnerable to shielding tripping accidents. What is the appropriate protection angle for the lightning protection line of overhead transmission lines, how much lightning current will cause shielding or counterattack on the transmission line, which phase of the insulator string will flashover, how large is the lightning current amplitude of the lightning strike line, and what is the actual lightning current waveform, etc. , has been an issue of international debate. Install a lightning measurement system on the ultra-high voltage transmission line, which is convenient for timely detection of faulty towers, and provides power departments with targeted lightning protection measures based on measurement information, providing first-hand information for future tower design, and also for lightning current The formulation of waveform and amplitude standards provides strong support and plays a very positive role in improving the international status of my country's lightning protection technology.

Contents of the invention

The purpose of this utility model is to provide a lightning full parameter measurement system for ultra-high voltage transmission lines by improving the above-mentioned deficiencies in the prior art. The measurement system can measure parameters such as the amplitude, waveform and duration of the lightning current on the transmission line struck by lightning, and can give the tower number of the line struck by lightning, the phase difference of the lightning conductor or conductor struck by lightning, and the amplitude of lightning current , polarity and lightning accident forms, to achieve rapid fault location.

In order to realize above-mentioned task, the technical solution of the present utility model is: adopted power supply, a plurality of current sensors, it is characterized in that, a plurality of current sensors are connected with lightning strike signal sampling unit, data receiving and GPRS, BT transmission unit respectively; The power supply is a DC power supply, which is composed of a battery, a solar panel and a voltage converter. The battery is connected to the solar panel and the voltage converter respectively; the DC power supplies power for the lightning signal sampling unit, data receiving and GPRS, BT transmission unit respectively; The data receiving and GPRS, BT transmission unit sends the lightning current signal collected by each channel to the Internet network through the antenna, and stores it in the FTP server; after the user terminal is connected to the Internet network, it can directly call the stored data in the FTP server.

It is characterized in that the current sensor adopts a traditional Rogowski coil.

It is characterized in that the lightning strike signal sampling unit includes high-speed sampling channel signal conditioning, high-speed data acquisition module, bus control unit, single-chip microcontroller, keyboard for debugging, liquid crystal display for debugging, RS232 serial port, real-time clock, address generation, channel identification and Coordination control unit, reference voltage generator and low-speed sampling channel signal conditioning; high-speed sampling channel signal conditioning is connected with high-speed data acquisition module, single-chip micro-controller is respectively connected with high-speed data acquisition module, bus control unit, address generation unit, channel identification unit and The coordination control unit is connected, and the bus control unit is respectively connected with the high-speed data acquisition module, the single-chip microcontroller, the address generation unit, the channel identification unit and the coordination control unit, and the single-chip microcontroller is equipped with a debugging keyboard, a debugging liquid crystal display, The RS232 communication port, the real-time clock, and the reference voltage generator are respectively connected with the signal conditioning of the high-speed sampling channel and the signal conditioning of the low-speed sampling channel; the signal conditioning of the low-speed sampling channel is connected with the single-chip microcontroller.

The working process of the utility model is that the direct current converted from sunlight is sent to the storage battery by the solar panel, and at the same time connected to the voltage converter, and the voltage of the storage battery is converted into the voltage required by each unit of the measurement system, which is the lightning strike signal sampling unit, data Receiving and GPRS, BT transmission unit power supply. Under the condition that the lightning strike signal sampling unit is connected with the current sensor, data receiving and GPRS, and BT transmission unit respectively, the current sensor used as collecting lightning current signal converts the lightning current into a voltage signal, and sends it to the lightning strike signal sampling unit with a coaxial cable. After the data is received and processed, it is sent to the GPRS and BT transmission unit through the connection interface, and the data obtained by each lightning current sensor is transmitted to the Internet network through the mobile network, and stored in the FTP server. The user terminal can download and receive data from the server. The high-speed data sampling channel corresponds to the lightning strike sampling current detected by the current sensor on the ground wire support of the tower lightning protection line and the insulator string, and works in parallel. The sampling mode of the high-speed data sampling channel is: 10-bit bipolar sampling, 10MHz sampling rate. The low-speed data sampling channel is set considering the requirements of extended test environment temperature and humidity, insulator string leakage current, etc. The single-chip micro-controller realizes sampling control of each channel, dumping of sampling data, real-time clock (accuracy is microsecond level), serial port transmission, etc. This part is at the heart of the system working properly.

The utility model has the following advantages and effects:

1) The current measurement range of the lightning measurement system is ±3kA～150kA, including almost the entire range where the transmission line may be subjected to lightning current, and meets the needs of actual engineering.

2) Fully digital data processing system, A/D conversion rate 10M times/s, 5-channel parallel sampling, each channel record word length 1s, to meet the needs of multiple mine records.

3) Each channel can measure the lightning current flowing through the phase wire and the ground wire at the same time, record the lightning current waveform and the time when the lightning strike occurs, intelligently determine the form of the lightning strike line, and realize the rapid and accurate positioning of the lightning strike line.

4) Adopt GPRS wireless transmission technology and Bluetooth technology to realize remote transmission of sampling data files to the receiver, which facilitates real-time monitoring and sharing of data.

5) The measurement system is equipped with a daily analog impulse current self-inspection mode and an outdoor equipment power supply report mode to ensure the long-term normal operation of the measurement equipment.

Description of drawings

Fig. 1, the structural representation of the utility model.

Fig. 2 is a schematic structural diagram of the current sensor of the present invention.

Fig. 3, the composition block diagram of the power supply of the utility model.

Fig. 4 is a schematic block diagram of the lightning strike signal sampling unit of the present invention.

Fig. 5, the schematic diagram of the main program flow of the utility model.

Fig. 6 is a schematic flow diagram of the user application program of the present invention.

Among them: 1-current sensor; 2-voltage converter; 3-battery; 4-solar panel; 5-data receiving and GPRS, BT transmission unit; 6-INTERNET network; 7-user terminal; 8-FTP server; 9 -lightning strike signal sampling unit; 91-high-speed sampling channel signal conditioning; 92-high-speed data acquisition module; 93-bus control unit; 94-single-chip microcontroller; 941-keyboard for debugging; 942-LCD display for debugging; Communication port; 944-real-time clock; 95-address generation unit; channel identification unit; coordination control unit; 96-reference voltage generator; 97-low-speed sampling channel signal conditioning.

Detailed ways

Below according to accompanying drawing, describe embodiment of the present utility model in detail.

As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, the utility model has adopted a power supply, a plurality of current sensors 1, and the power supply is a DC power supply, consisting of a storage battery 3, a solar panel 4 and Composed of voltage converters, a plurality of current sensors 1 are respectively connected to the lightning strike signal sampling unit 9, and the lightning strike signal sampling unit 9 is connected to the data receiving and GPRS, BT transmission unit 5, and the storage battery 3 is respectively connected to the solar panel 4 and the voltage converter 2 Connected, the output of the voltage converter 2 is connected to the lightning strike signal sampling unit 9 , data receiving and GPRS, BT transmission unit 5 respectively. The data receiving and GPRS, BT transmission unit 5 transmits each lightning current signal to the INTERNET network 6 through the mobile network, and stores it in the FTP server 8 . The user terminal 7 is connected to the Internet 6, and can directly call the storage data of the FTP server 8.

The interconnection relationship and the effect of forming each part of the utility model are as follows:

The current sensor 1 is connected to the lightning strike signal sampling unit 9 to receive the collected lightning current signal, and then connected to the data receiving and GPRS, BT transmission unit 5 for data processing and sending. The storage battery 3 is respectively connected with the solar panel 4 and the voltage converter 2, and serves as a power supply for the equipment. The power supply is a DC power supply. The data receiving and GPRS, BT transmission unit 5 transmits the data obtained by each lightning current sensor 1 to the Internet network 6 through the mobile network, and stores it in the FTP server 8 . The user terminal 7 can directly call the stored data of the FTP server 8 through the Internet 6 . Current sensor 1 and (5-way 10M times/second) lightning strike signal sampling unit 9 are self-developed, solar panel 4 and storage battery 3 are purchased conventional products, and the processing board in data receiving and GPRS, BT transmission unit 5 is industrial Grade PC104, the purchased GPRS with antenna is a general industrial grade module. The current sensor 1 of the present utility model adopts a traditional Rogowski coil, and the winding of the coil is shown in FIG. 2 . The power supply of the present utility model is made up of accumulator 3, solar panel 4, voltage converter 2. The storage battery 3 is respectively connected with the solar panel 4 and the voltage converter 2, the direct current of the solar panel 4 is photoelectrically converted to charge the storage battery 3, and the storage battery 3 supplies power to the voltage converter 2, which is transformed into the working voltage required by the measurement system; voltage conversion The device 2 is connected to the lightning strike signal sampling unit 9, data receiving and GPRS, BT transmission unit 5 respectively.

As shown in Figure 4, the lightning strike signal sampling unit 9 includes a high-speed sampling channel signal conditioning 91, a high-speed data acquisition module 92, a bus control unit 93, a microcontroller 94, a keyboard 941 for debugging, a liquid crystal display 942 for debugging, and an RS232 serial port 943 , real-time clock 944, address generation, channel identification and coordination control unit 95, reference voltage generator 96 and low-speed sampling channel signal conditioning 97. The high-speed sampling channel signal conditioning 91 is connected with the high-speed data acquisition module 92, and the microcontroller 94 is respectively connected with the high-speed data acquisition module 92, the bus control unit 93, the address generation unit, the channel identification unit and the coordination control unit 95, and the bus control unit 93 is respectively connected with the high-speed data acquisition module 92, single-chip microcontroller 94, address generating unit, channel identification unit and coordination control unit 95, and the single-chip microcontroller 13 is equipped with a keyboard 941 for debugging, a liquid crystal display 942 for debugging, and RS232 communication Port 943, real-time clock 944, reference voltage generator 96 are connected with high-speed sampling channel signal conditioning 91 and low-speed sampling channel signal conditioning 97 respectively; low-speed sampling channel signal conditioning 97 is connected with single-chip microcontroller 94. The high-speed data sampling channel corresponds to each channel of the lightning sampling current on the tower lightning protection line or insulator, and works in parallel (6-way design, 1-way backup). The sampling mode of the high-speed data sampling channel is: 10-bit bipolar sampling, 10MHz sampling rate. The low-speed data sampling channel considers the needs of expanding the temperature and humidity of the test environment, the leakage current of insulator strings, etc. The single-chip microcontroller 94 realizes the sampling control of each channel, dumping of sampling data, real-time clock, serial port transmission, etc., which is the core of the normal operation of the system. The sampling is controlled by the microcontroller 94 of each channel; the data transmission and access process is completed through the bus control unit 93, and the address generation, channel identification and coordination control unit 95 completes the coordination of the access address and channel; the low-speed sampling channel signal conditioning 97 is sent to single-chip microcontroller 94 after collecting signals such as wind speed and temperature; the reference voltage of high-speed and low-speed sampling signal conditioning is produced by reference voltage generator 96; GPRS, BT transmission unit 5, to realize the asynchronous transmission of sampling data; The interface of the keyboard 941 for debugging and the liquid crystal display 942 for debugging in Fig. 4 is used for debugging.

The lightning strike signal sampling unit 9 is fully managed by the single-chip microcontroller 94, and its main program flow is shown in FIG. 5 . The program can be written by ordinary technicians according to their basic knowledge, using Basic language or Pascal language or C/C++ language or Fortran language programming, or ordinary programs (all available in the market) to realize the control of the lightning signal sampling unit .

After starting the program, the status flag and related data storage unit will be initialized (process A), then read the GPS real-time clock signal, and calibrate the system time (process B), and then judge whether the system is in the debugging state (process C), if it is , then call the keyboard and LCD display program, which is convenient for debuggers to check the intermediate state of program execution (process D). ), if it has not been triggered, then return to process B, if the sampling has been triggered, record the trigger time (process F), and wait until the sampling data is ready (process G), then start the serial port sending service program, the sub The program adopts the serial port interrupt method (process H) until the sampling data is sent (process J), and returns to process B after sending, waiting for the next round of sampling trigger.

Fig. 6 shows the user application program flow diagram when data receiving and GPRS, BT transmission unit 5 are controlled and managed, and this program common technical personnel can write according to basic knowledge, adopts Basic language or Pascal language or C/C++ language or Fortran Language programming can also use common programs (available in the market). Its function is to receive the sampling data of the lightning strike signal sampling unit, and control the transmission unit module to connect with the FTP server on the remote public Internet in a wireless manner, and send data to the remote terminal. The directory specified by the FTP server transfers the sampling data files. At the same time, in order to reduce the amount of wireless transmission data, a filter program is designed in the software to filter out harmonics above 1.5MHz. After starting the program, the status flag and related data storage unit will be initialized (process A), and then the RS232 communication serial port 943 will be opened to receive the interrupt (process B), then the microcontroller may respond to the interrupt signal received by the RS232 port at this time, After receiving the interrupt signal, transfer to the interrupt service subroutine, first read the state quantity in the receiving buffer (process C), and judge whether the system is in the debugging state (process D), if so, call the keyboard and LCD display program, which is convenient The debugger checks the intermediate state of the program execution (process E), if it is not the debugging state, in order to save the program running time, it is not necessary to adjust the keyboard to display the program, and then judge whether it has received a contact signal from the microcontroller (process E), if not Received, then return to process C, wait in a loop, if the contact signal from the microcontroller has been received, then send a response signal to the single-chip microcomputer, and judge the type of received data (process G), and then obtain the data in the receiving buffer amount (process H), until receiving the prescribed byte (process I), connect to the GPRS network below, prepare for wireless data transmission (process J), resolve the domain name of the remote FTP server (process K), after finishing, upload the FTP file Upload to the remote FTP server (process L) until the FTP file upload is complete (process M). If all the data is uploaded this time, return to process C and wait for the next round of data upload tasks to start.

Claims (3)

1. The ultra-high voltage transmission line lightning full-parameter measurement system adopts a power supply and multiple current sensors, which are characterized in that multiple current sensors (1) and lightning signal sampling unit (9), data receiving and GPRS, BT transmission unit (5) are connected respectively; The power supply system DC power supply is made up of storage battery (3), solar panel (4) and voltage converter (2), and storage battery (3) is respectively connected with solar panel (4), voltage converter ( 2) connected; the lightning strike signal sampling unit (9), data receiving and GPRS, BT transmission unit (5) are powered by the DC power supply respectively; the data receiving and GPRS, BT transmission unit (5) collects the lightning current The signal is sent to the Internet network (6) through the antenna, and stored in the FTP server (8); after the user terminal (7) is connected to the Internet network (6), the stored data in the FTP server (8) can be called directly. 2. The ultra-high voltage transmission line lightning full parameter measurement system according to claim 1, characterized in that the current sensor (1) adopts a traditional Rogowski coil. 3. The ultra-high voltage transmission line lightning full parameter measurement system according to claim 1, characterized in that the lightning strike signal sampling unit (9) includes a high-speed sampling channel signal conditioning (91), a high-speed data acquisition module (92), a bus control Unit (93), microcontroller (94), debugging keyboard (941), debugging liquid crystal display (942), RS232 serial port (943), real-time clock (944), address generation, channel identification and coordination control unit ( 95), reference voltage generator (96) and low-speed sampling channel signal conditioning (97); high-speed sampling channel signal conditioning (91) is connected with high-speed data acquisition module (92) Module (92), bus control unit (93), address generating unit, channel identification unit and coordination control unit (95) are connected, and bus control unit (93) is connected with high-speed data acquisition module (92), single-chip microcontroller ( 94), the address generation unit, the channel identification unit and the coordination control unit (95) are connected, and a keyboard (941) for debugging, a liquid crystal display (942) for debugging, and an RS232 communication port (943) are installed on the microcontroller (94) , real-time clock (944), reference voltage generator (96) links to each other with high-speed sampling channel signal conditioning (91), low-speed sampling channel signal conditioning (97); low-speed sampling channel signal conditioning (97) and single-chip microcontroller (94) ) connected.

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