Novel high-frequency data acquisition terminal

Abstract

The utility model provides a novel high-frequency data acquisition terminal, which can improve the defects of the conventional traveling wave method measurement and further improve the accuracy of the acquisition terminal, the acquisition terminal comprises a singlechip, a communication module, a GPS (Global Positioning System) module, a three-path signal conditioning circuit and an SRAM (Static Random Access Memory) external expansion memory, the model of the singlechip is STM32H74311T6, an OSCI N pin of the singlechip is connected with an active crystal oscillator, and the SRAM external expansion memory is connected with the communication module. The model number of the active crystal oscillator is SX7M25.000 B10F20TNN; and the model number of the active crystal oscillator is The communication module is connected with the single chip microcomputer, and the model of the communication module is USR-NB75; the GPS module is connected with the single chip microcomputer, and the model of the GPS module is NEO-M8Q; the three signal conditioning circuits are respectively connected with a PF9 pin, a PA52 pin and a PA54 pin of the single-chip microcomputer. The SRAM external expansion memory is connected with the single-chip microcomputer, the model of the SRAM external expansion memory is W9825G6KH-6I, a pin 19 of the SRAM external expansion memory is connected with a first resistor, and the first resistor is connected with six parallel 0.1 mu F / 50V capacitors and then is grounded.

Description

Technical Field

[0001] The utility model relates to the field of power transmission line maintenance, and in particular to a novel high-frequency data acquisition terminal. Background Art

[0002] In the prior art, the traveling wave method is often used to monitor faults. It has the advantage of high ranging accuracy. In actual use, we found that it has at least the following technical problems:

[0003] 1. When there is a lot of interference on the line, and its characteristics are similar to the transmission wave of the fault point, it cannot be identified;

[0004] 2. As a coupling element for extracting the current traveling wave model, the current transformer has a great influence on the traveling wave ranging due to the dispersed dynamic delay caused by coupling and starting nonlinear elements. Utility Model Content

[0005] The purpose of the utility model is to provide a novel high-frequency data acquisition terminal, which can improve the shortcomings of the existing traveling wave method measurement and further improve the accuracy of the acquisition terminal.

[0006] The embodiment of the utility model is achieved as follows:

[0007] A novel high-frequency data acquisition terminal comprises: a single-chip microcomputer, a communication module, a GPS module, a 3-way signal conditioning circuit and an SRAM external expansion memory. The model of the single-chip microcomputer is STM32H74311T6, the OSCI N pin of the single-chip microcomputer is connected to an active crystal oscillator, the model of the active crystal oscillator is SX7M25.000B10F20TNN; the communication module is connected to the single-chip microcomputer, the model of the communication module is USR-NB75; the GPS module is connected to the single-chip microcomputer, the model of the GPS module is NEO-M8Q; the 3-way signal conditioning circuit is respectively connected to the PF9 pin, the PA52 pin and the PA54 pin of the single-chip microcomputer; the SRAM external expansion memory is connected to the single-chip microcomputer, the model of the SRAM external expansion memory is W9825G6KH-6I, wherein the 19th pin of the SRAM external expansion memory is connected to a first resistor, the first resistor is connected to 6 parallel 0.1μF / 50V capacitors and then grounded, and is used for recording and storing 16 groups of 1.6MHZ fault waveform data.

[0008] In a preferred embodiment of the utility model, the signal conditioning circuit includes a first operational amplifier, the non-phase input terminal and the inverting input terminal of the first operational amplifier are connected to the first capacitor, the positive terminal of the first capacitor is connected to the second resistor, the positive electrode of the second resistor is connected to the second capacitor and the third resistor in parallel, and the positive electrode of the third resistor is respectively connected to the positive electrode of the signal acquisition terminal and the fourth resistor; the negative terminal of the first capacitor is connected to the fifth resistor, the negative electrode of the fifth resistor is respectively connected to the third capacitor and the sixth resistor, the third capacitor and the second capacitor are connected, the negative electrode of the sixth resistor is respectively connected to the seventh resistor and the eighth resistor, the seventh resistor is connected to the fourth resistor, and the eighth resistor is connected to the ninth resistor and then connected to the negative electrode of the signal acquisition terminal; a 5V reference voltage is connected between the second capacitor and the third capacitor and between the fourth resistor and the seventh resistor.

[0009] In a preferred embodiment of the utility model, the signal conditioning circuit also includes a second operational amplifier, the output end of the second operational amplifier is connected to a 5V reference voltage and connected to a reverse input end; the non-inverting input end of the second operational amplifier is respectively connected to a ninth resistor and a tenth resistor, the ninth resistor is connected to the positive power supply end of the first operational amplifier, and the tenth resistor is grounded.

[0010] In a preferred embodiment of the present invention, the model of the first operational amplifier is AD8421ARZ-R7; the model of the second operational amplifier is ADS22AR.

[0011] The beneficial effect of the embodiment of the utility model is that the acquisition terminal in the utility model uses the voltage and current data at both ends, as well as the time difference between the initial traveling wave and the reflected wave received by the measuring end at the fault point, and effectively combines it with the traveling wave velocity by setting up three signal conditioning circuits, so as to determine the distance of the fault. It can be less affected by line load, system parameters, system operation mode and transition resistance, so as to accurately and quickly find the transmission line fault, which can effectively reduce the line patrol pressure and burden of the staff, and the time for repairing the fault is further shortened, which can further improve the safety and reliability of the power supply of the power system, reduce the faults caused by power outages, and reduce the losses caused by power outages. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 This is a circuit connection block diagram of an embodiment of the utility model;

[0014] Figure 2-4 A circuit connection diagram of a signal conditioning circuit according to an embodiment of the present utility model;

[0015] Figure 5-6 A schematic diagram of the connection of the SRAM external expansion memory circuit of an embodiment of the utility model;

[0016] Icons: 110-single chip microcomputer; 120-communication module; 130-GPS module; 140-signal conditioning circuit; 150-SRAM external memory; 160-power module;

[0017] 141-first operational amplifier; 142-first capacitor; 143-second resistor; 144-second capacitor; 145-third resistor; 146-fourth resistor; 147-fifth resistor; 148-third capacitor; 149-sixth resistor; 101-seventh resistor; 102-eighth resistor; 103-ninth resistor; 104-second operational amplifier; 105-tenth resistor; 151-first resistor; 152-eighth capacitor. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0021] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0022] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] First embodiment

[0025] See also Figure 1 This embodiment provides a new type of high-frequency data acquisition terminal, which includes a single-chip microcomputer 110, a communication module 120, a GPS module 130, a three-way signal conditioning circuit 140 and an SRAM external expansion memory 150, and a power module 160 for providing power to the above modules.

[0026] Three of the signal conditioning circuits are used to collect the initial traveling waves and reflected waves of the high-frequency synchronous transmission line, as well as the current and voltage at both ends of the line. Two of the signal conditioning circuits are used for two-terminal fault ranging, and the other is used for traveling wave fault ranging. The monitoring data collected by the two methods are transmitted to the microcontroller for data calculation and comparison. When the transmission waves of the fault point are similar and cannot be detected, the two-terminal method is used to measure the current at both ends of the line and the voltage at one end, thereby overcoming the defect that similar waves cannot be detected.

[0027] The SRAM external expansion memory 150 is used to store fault waveform data and standard two-terminal current and voltage data, so as to facilitate the single-chip microcomputer 110 to retrieve the fault waveform data and current and voltage data. The single-chip microcomputer 110 determines the line fault type by comparing the real-time measured waveform data with the fault waveform data / voltage and current data.

[0028] The communication module 120 is used to transmit the determined fault type to the server. The GPS module 130 is used for positioning to meet the requirement of accurate distance measurement and facilitate the staff to go for maintenance.

[0029] Specifically, the model of the single-chip microcomputer 110 used in this embodiment is STM32H74311T6, which can meet the large amount of computing requirements of dual-end ranging and traveling wave ranging. The OSCI N pin of the single-chip microcomputer 110 is connected to an active crystal oscillator, and the model of the active crystal oscillator is SX7M25.000B10F20TNN, which has good signal quality and is stable and convenient to output waveforms.

[0030] The pin 158 of the single chip microcomputer is also connected to a clock correction module to eliminate the time synchronization signal exceeding the threshold range, thereby improving the ranging accuracy.

[0031] The communication module 120 is connected to the single-chip microcomputer 110. The model of the communication module 120 used in this embodiment is USR-NB75. In this embodiment, the communication module 120 is provided with a communication serial port and a working indicator light serial port, which are respectively connected to the communication circuit and the indicator light circuit.

[0032] The GPS module 130 is connected to the single chip microcomputer 110 . The model of the GPS module 130 used in this embodiment is NEO-M8Q.

[0033] The three signal conditioning circuits are connected to the 110PF9 pin, PA52 pin and PA54 pin of the single chip computer respectively, and collect data synchronously at high frequency in parallel.

[0034] For details, see Figure 2-4The signal conditioning circuit 140 includes a first operational amplifier 141, a non-inverting input terminal and an inverting input terminal of the first operational amplifier 141 are connected to a first capacitor 142, a positive terminal of the first capacitor 142 is connected to a second resistor 143, a positive electrode of the second resistor 143 is connected to a second capacitor 144 and a third resistor 145 connected in parallel, and a positive electrode of the third resistor 145 is respectively connected to a positive electrode of a signal acquisition terminal and a fourth resistor 146; a negative terminal of the first capacitor 142 is connected to a fifth resistor 147, a negative electrode of the fifth resistor 147 is respectively connected to a third capacitor 148 and a sixth resistor 149, the third capacitor 148 is connected to the second capacitor 144, a negative electrode of the sixth resistor 149 is respectively connected to a seventh resistor 101 and an eighth resistor 102, the seventh resistor 101 is connected to the fourth resistor 146, and the eighth resistor 102 is connected to the signal acquisition terminal; a 5V reference voltage is connected between the second capacitor 144 and the third capacitor 148, and between the fourth resistor 146 and the seventh resistor 101.

[0035] Among them, the first capacitor is a 1nF / 50V capacitor, the second capacitor and the third capacitor are 100pF / 50V capacitors; the second, third, fifth and sixth resistors are 100Ω resistors, and the fourth, seventh and eighth resistors are 20KΩ resistors.

[0036] The output end of the first operational amplifier is also connected to an eleventh resistor, which is respectively connected to the twelfth resistor and the ADC12-I NP3 serial port of the single-chip computer, and the twelfth resistor is grounded. The eleventh resistor is a 20kΩ resistor, and the twelfth resistor is a 10KΩ resistor.

[0037] The positive and negative power supply terminals of the first operational amplifier are connected to a 15V power supply, and the positive and negative access terminals are also connected to a sixth capacitor and a seventh capacitor respectively, and then grounded respectively, wherein the sixth and seventh capacitors are both 0.1μF / 50V capacitors.

[0038] The signal conditioning circuit further includes a second operational amplifier 104, the output end of the second operational amplifier 104 is connected to the reverse input end through a 5V reference voltage; the non-inverting input end of the second operational amplifier 104 is respectively connected to the ninth resistor 103 and the tenth resistor 105, the ninth resistor 103 is connected to the positive power supply end of the first operational amplifier 141, and the tenth resistor 105 is grounded. The ninth resistor is a 10kΩ resistor, and the tenth resistor is a 5KΩ resistor.

[0039] The positive power supply terminal of the second operational amplifier 104 is connected to a fourth capacitor and then grounded, wherein the fourth capacitor is a 0.1 μF / 50V capacitor; the negative power supply terminal is connected to a fifth capacitor and then grounded, wherein the fifth capacitor is a 0.15 μF / 50V capacitor.

[0040] The model of the first operational amplifier 141 is AD8421ARZ-R7; the model of the second operational amplifier 104 is ADS22AR.

[0041] See also Figure 5-6 The SRAM external expansion memory 150 is connected to the single-chip computer 110, and the model of the SRAM external expansion memory 150 is W9825G6KH-6I, wherein the 19th pin of the SRAM external expansion memory 150 is connected to the first resistor 151, and the first resistor 151 is connected to 6 parallel 0.1μF / 50V eighth capacitors 152 and then grounded, and is used to record and store 16 groups of 1.6MHZ fault waveform data.

[0042] The acquisition terminal in the utility model sets up three signal conditioning circuits to utilize the voltage and current data at both ends, as well as the time difference between the initial traveling wave and the reflected wave received by the measuring end at the fault point, and effectively combines them with the traveling wave velocity to determine the distance of the fault. It can be less affected by line load, system parameters, system operation mode and transition resistance, so as to accurately and quickly find the transmission line fault, which can effectively reduce the line patrol pressure and burden of the staff, and the time for repairing the fault is further shortened, which can further improve the safety and reliability of the power supply of the power system, reduce the faults caused by power outages, and reduce the losses caused by power outages.

[0043] This specification describes examples of embodiments of the utility model, and it is not intended that these embodiments illustrate and describe all possible forms of the utility model. It should be understood that the embodiments in the specification can be implemented in a variety of alternative forms. The drawings do not need to be drawn to scale; some features can be enlarged or reduced to show the details of specific components. The specific structural and functional details disclosed should not be interpreted as limiting, but are merely representative bases for teaching those skilled in the art to implement the utility model in various forms. It should be understood by those skilled in the art that the multiple features illustrated and described with reference to any of the drawings can be combined with the features illustrated in one or more other drawings to form embodiments that are not explicitly described or described. The described combined features provide representative embodiments for typical applications. However, various combinations and variations of features consistent with the teachings of the utility model can be used for specific applications or implementations as needed.

[0044] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A new type of high-frequency data acquisition terminal, characterized in that: The acquisition terminal comprises: A single-chip microcomputer, the model of which is STM32H74311T6, the OSCIN pin of which is connected to an active crystal oscillator, the model of which is SX7M25.000B10F20TNN; A communication module, connected to the single chip microcomputer, the model of the communication module is USR-NB75; A GPS module is connected to the single chip microcomputer, and the model of the GPS module is NEO-M8Q; 3 signal conditioning circuits, connected to the PF9 pin, PA52 pin and PA54 pin of the single chip computer respectively; An SRAM external expansion memory is connected to the single-chip microcomputer. The model of the SRAM external expansion memory is W9825G6KH-6I. Pin 19 of the SRAM external expansion memory is connected to a first resistor. The first resistor is connected to 6 parallel 0.1μF / 50V capacitors and then grounded. At least 16 groups of 1.6MHZ fault waveform data are stored.

2. The novel high-frequency data acquisition terminal according to claim 1 is characterized in that: The signal conditioning circuit includes a first operational amplifier, wherein the non-inverting input terminal and the inverting input terminal of the first operational amplifier are connected to the first capacitor, the positive terminal of the first capacitor is connected to the second resistor, the positive electrode of the second resistor is connected to the second capacitor and the third resistor in parallel, and the positive electrode of the third resistor is respectively connected to the positive electrode of the signal acquisition terminal and the fourth resistor; the negative terminal of the first capacitor is connected to the fifth resistor, the negative electrode of the fifth resistor is respectively connected to the third capacitor and the sixth resistor, the third capacitor is connected to the second capacitor, the negative electrode of the sixth resistor is respectively connected to the seventh resistor and the eighth resistor, the seventh resistor is connected to the fourth resistor, and the eighth resistor is connected to the ninth resistor and then connected to the negative electrode of the signal acquisition terminal; a 5V reference voltage is connected between the second capacitor and the third capacitor and between the fourth resistor and the seventh resistor.

3. The novel high-frequency data acquisition terminal according to claim 2 is characterized in that: The signal conditioning circuit also includes a second operational amplifier, the output end of the second operational amplifier is connected to the 5V reference voltage and connected to the reverse input end; the non-inverting input end of the second operational amplifier is respectively connected to the ninth resistor and the tenth resistor, the ninth resistor is connected to the positive power supply end of the first operational amplifier, and the tenth resistor is grounded.

4. The novel high-frequency data acquisition terminal according to claim 3 is characterized in that: The model of the first operational amplifier is AD8421ARZ-R7; the model of the second operational amplifier is ADS22AR.

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