Voltage sensor circuit of overhead line on-line comprehensive monitoring device

Abstract

The utility model discloses a voltage sensor circuit of an overhead line on-line comprehensive monitoring device, which comprises a voltage dividing capacitor, a filtering module, an operational amplification module, a signal conditioning module and an output module, and is characterized in that a first end of the voltage dividing capacitor is connected with a high-voltage input signal; the second end of the voltage dividing capacitor is connected with the input end of the filtering module; the output end of the filtering module is connected with the input end of the operational amplification module; the output end of the operational amplification module is connected with the input end of the signal conditioning module; and the output end of the signal conditioning module is connected with the output module. According to the utility model, the miniature modularization of the voltage sensor can be realized. The sensor can be widely applied to the technical field of sensors.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a voltage sensor circuit for an online integrated monitoring device for overhead lines. Background Technology

[0002] The overhead line online integrated monitoring device is an intelligent device used to monitor the operating status of transmission lines in real time, aiming to improve power grid safety, prevent faults, and optimize operation and maintenance efficiency. This device relies on voltage sensors mounted on it to detect the line's voltage signal in real time. However, existing voltage sensor circuits typically consist of a signal sensing unit, a high-impedance front-end, a signal conditioning circuit, a digital-to-analog converter, and a power supply system. Due to the contradiction between the electrode size and sensitivity of the signal sensing unit, the coil is bulky; the high-impedance front-end requires high-voltage power supply, relying on discrete JFETs, occupying over 40% of the PCB area; the signal conditioning circuit needs to handle multi-stage amplification and bandpass filtering, with more than 20 passive components; and the power supply module accounts for over 30% of the PCB area. Therefore, existing electronic voltage sensors are cumbersome and cannot meet the small, modular requirements of the overhead line online integrated monitoring device in high-voltage power grid monitoring, distributed intelligent grid-connected monitoring, and other fields. Utility Model Content

[0003] To address the aforementioned technical problems, the objective of this utility model is to provide a voltage sensor circuit for an online integrated monitoring device for overhead lines, which enables the miniaturization and modularization of electronic voltage sensors.

[0004] The technical solution adopted in this utility model is: a voltage sensor circuit for an online integrated monitoring device for overhead lines, comprising a voltage dividing capacitor, a filtering module, an operational amplifier module, a signal conditioning module, an output module, a data acquisition and processing unit, a power supply module, and a wireless communication module, wherein:

[0005] The first terminal of the voltage divider capacitor is connected to the high-voltage input signal; the second terminal of the voltage divider capacitor is connected to the input terminal of the filter module; the output terminal of the filter module is connected to the input terminal of the operational amplifier module; the output terminal of the operational amplifier module is connected to the input terminal of the signal conditioning module; the output terminal of the signal conditioning module is connected to the input terminal of the output module; the output terminal of the output module is connected to the input terminal of the data acquisition and processing unit, which is used to acquire analog voltage signals and perform analysis and processing; the output terminal of the data acquisition and processing unit is connected to the input terminal of the wireless communication module.

[0006] The filtering module includes a sixth resistor, a fifteenth capacitor, and a sixteenth capacitor. The first end of the sixth resistor is connected to the second end of the voltage divider capacitor. The second end of the sixth resistor is connected to the first end of the fifteenth capacitor, the first end of the sixteenth capacitor, and the input terminal of the operational amplifier module. The second ends of the fifteenth capacitor and the second ends of the sixteenth capacitor are grounded.

[0007] The operational amplifier module includes an eighteenth capacitor, a fourth resistor, a fourteenth capacitor, a seventeenth capacitor, a seventh resistor, a fifth resistor, and an operational amplifier. The negative input gain adjustment pin of the operational amplifier is connected to the first terminal of the fourth resistor; the positive input gain adjustment pin of the operational amplifier is connected to the second terminal of the fourth resistor; the differential input negative pin of the operational amplifier is connected to the second terminal of the fifth resistor; the first terminal of the fifth resistor is grounded; the differential input positive pin of the operational amplifier is connected to the second terminal of the sixth resistor; the negative power supply pin of the operational amplifier is connected to the second terminal and negative power supply of the eighteenth capacitor; the first terminal of the eighteenth capacitor is grounded; the positive power supply pin of the operational amplifier is connected to the first terminal and positive power supply of the fourteenth capacitor; the second terminal of the fourteenth capacitor is grounded; the reference voltage input pin of the operational amplifier is connected to the first terminal of the seventeenth capacitor and the first terminal of the seventh resistor; the second terminals of the seventeenth capacitor and the second terminal of the seventh resistor are grounded; the output pin of the operational amplifier is connected to the first terminal of the eighth resistor.

[0008] The signal conditioning module includes an eighth resistor, a ninth resistor, and a nineteenth capacitor. The first end of the eighth resistor is connected to the output terminal of the operational amplifier. The second end of the eighth resistor is connected to the first end of the ninth resistor, the first end of the nineteenth capacitor, and the signal output interface of the output module. The second end of the ninth resistor and the second end of the nineteenth capacitor are grounded.

[0009] Furthermore, the fifteenth capacitor and the sixteenth capacitor form a multi-capacitor parallel connection, used to filter out noise and AC components in the high-voltage input signal.

[0010] Furthermore, the fourth resistor and the fifth resistor are operational amplifier adjustment resistors, which together adjust the gain of the operational amplifier.

[0011] Furthermore, the seventh resistor and the seventeenth capacitor form an RC parallel network to provide the midpoint voltage.

[0012] Furthermore, the ninth resistor and the nineteenth capacitor form an RC parallel network, which is used to determine the output impedance and calibrate the output phase difference.

[0013] Furthermore, the eighth and ninth resistors are used to adjust the output voltage amplitude.

[0014] Furthermore, the fourteenth capacitor and the eighteenth capacitor are filter capacitors, used to filter out noise and AC components in the positive and negative power supplies, respectively.

[0015] The beneficial effects of this utility model are as follows: This utility model proposes a voltage sensor circuit for an online integrated monitoring device for overhead lines. It reduces the voltage of the high-voltage input signal through a voltage-dividing capacitor; filters out noise and AC components from the reduced-voltage input signal through a filtering module; amplifies the filtered input signal through a signal amplification module for easy observation; and determines the output impedance of the circuit and calibrates the phase difference of the operational amplifier output signal through a signal conditioning module, thereby achieving monitoring of the high-voltage input signal. This voltage sensor circuit enables the miniaturization and modularization of electronic voltage sensors, thus achieving portability and optimization of the online integrated monitoring device for overhead lines. The voltage sensor using this circuit can achieve an accuracy of less than 0.2%. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the voltage sensor circuit of an online integrated monitoring device for overhead lines according to this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of an overhead line online integrated monitoring device, which is a voltage sensor circuit of an overhead line online integrated monitoring device according to this utility model.

[0018] Figure description: C, voltage divider capacitor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; C15, fifteenth capacitor; C16, sixteenth capacitor; C17, seventeenth capacitor; C18, eighteenth capacitor; C19, nineteenth capacitor; U5, operational amplifier; CN1, output module; 1, voltage sensor. Detailed Implementation

[0019] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0020] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0023] Reference Figure 1 A voltage sensor circuit for an online integrated monitoring device for overhead power lines includes a voltage divider capacitor C, a filter module, an operational amplifier module, a signal conditioning module, an output module, a data acquisition and processing unit, a power supply module, and a wireless communication module, wherein:

[0024] The first terminal of the voltage divider capacitor C is connected to the high-voltage input signal. The voltage of the high-voltage input signal is reduced by the voltage divider capacitor C; otherwise, the 10KV, 50Hz high-voltage input signal used in this specific embodiment will overvoltage and break down the operational amplifier, damaging circuit components. The second terminal of the voltage divider capacitor C is connected to the input terminal of the filter module. The filter module filters out noise and AC components from the reduced-voltage input signal. The output terminal of the filter module is connected to the input terminal of the operational amplifier module. The filtered input signal is amplified for easy observation. The output terminal of the operational amplifier module is connected to the input terminal of the signal conditioning module. This module is used to determine the output impedance of the circuit and calibrate the phase difference of the operational amplifier output signal. The output terminal of the signal conditioning module is connected to the input terminal of the output module. The output terminal of the output module is connected to the input terminal of the data acquisition and processing unit. The data acquisition and processing unit is used to acquire analog voltage signals and perform analysis and processing. The output terminal of the data acquisition and processing unit is connected to the input terminal of the wireless communication module. The processed digital voltage signal is transmitted to the wireless communication module, which then sends the processed digital voltage signal to the operator's terminal device or cloud platform.

[0025] In a preferred embodiment, the signal conditioning module includes an eighth resistor R8, a ninth resistor R9, and a nineteenth capacitor C19, wherein:

[0026] The first terminal of the eighth resistor R8 is connected to the output terminal of operational amplifier U5; the second terminal of the eighth resistor R8 is connected to the first terminal of the ninth resistor R9, the first terminal of the nineteenth capacitor C19, and the signal output interface of the output module; the second terminals of the ninth resistor R9 and the nineteenth capacitor C19 are grounded. The ninth resistor R9 and the nineteenth capacitor C19 together form an RC parallel network, used to determine the output impedance and calibrate the output phase difference; the eighth resistor R8 and the ninth resistor R9 are used to adjust the output voltage amplitude.

[0027] In a preferred embodiment, the filtering module includes a sixth resistor R6, a fifteenth capacitor C15, and a sixteenth capacitor C16, wherein:

[0028] The first terminal of the sixth resistor R6 is connected to the second terminal of the voltage divider capacitor C; the second terminal of the sixth resistor R6 is connected to the first terminal of the fifteenth capacitor C15, the first terminal of the sixteenth capacitor C16, and the input terminal of the operational amplifier module; the second terminals of the fifteenth capacitor C15 and the sixteenth capacitor C16 are grounded. The sixth resistor R6 reduces current noise and common-mode noise, and also improves the stability and reliability of the circuit; the fifteenth capacitor C15 and the sixteenth capacitor C16 together form a parallel multi-capacitor circuit, used to filter out noise and AC components in the input signal after voltage reduction.

[0029] In a preferred embodiment, the operational amplifier module includes an eighteenth capacitor C18, a fourth resistor R4, a fourteenth capacitor C14, a seventeenth capacitor C17, a seventh resistor R7, a fifth resistor R5, and an operational amplifier U5, wherein:

[0030] The negative input gain adjustment pin RG- of operational amplifier U5 is connected to the first terminal of the fourth resistor R4; the positive input gain adjustment pin RG+ of operational amplifier U5 is connected to the second terminal of the fourth resistor R4; the differential input negative pin IN- of operational amplifier U5 is connected to the second terminal of the fifth resistor R5; the first terminal of the fifth resistor R5 is grounded; the differential input positive pin IN+ of operational amplifier U5 is connected to the second terminal of the sixth resistor R6; the negative power supply pin VS- of operational amplifier U5 is connected to the second terminal of the eighteenth capacitor C18 and the negative power supply VEE; the first terminal of the eighteenth capacitor C18 is grounded; the positive power supply pin VS+ of operational amplifier U5 is connected to the first terminal of the fourteenth capacitor C14 and the positive power supply VCC; the second terminal of the fourteenth capacitor C14 is grounded; the reference voltage input pin REF of operational amplifier U5 is connected to the first terminal of the seventeenth capacitor C17 and the first terminal of the seventh resistor R7; the second terminals of the seventeenth capacitor C17 and the second terminal of the seventh resistor R7 are grounded; the output pin OUT of operational amplifier U5 is connected to the first terminal of the eighth resistor R8. The fourth resistor R4 and the fifth resistor R5 are operational amplifier adjustment resistors, which together adjust the gain of the operational amplifier. The seventh resistor R7 and the seventeenth capacitor C17 together form an RC parallel network to provide the midpoint voltage; the fourteenth capacitor C14 and the eighteenth capacitor C18 are filter capacitors, which are used to filter out noise and AC components in the positive and negative power supplies, respectively.

[0031] As a preferred embodiment, the output module also includes a power port VCC and a ground port GND. In a specific embodiment of this utility model, the output module does not need to perform signal conditioning function, but only outputs the output signal adjusted by the signal conditioning module. Therefore, in order to minimize the circuit structure, the output module and the power module are organically integrated. The output module can be a socket with an output interface, a power interface and a ground interface.

[0032] As a preferred embodiment, to further highlight the small and modular features of the voltage sensor, the voltage divider capacitor C is placed on the outside of the PCB board, and screw holes and copper screws are used as the connection medium between the voltage divider capacitor C and the filter module, which further avoids the impact of the large size of the voltage divider capacitor C on the small and modular design of the voltage sensor circuit.

[0033] In a specific embodiment of this utility model, the fifteenth and sixteenth capacitors form a multi-capacitor parallel connection, the seventh resistor and the seventeenth capacitor form an RC parallel connection, and the ninth resistor and the nineteenth capacitor form an RC parallel connection. By using a multi-element parallel compensation method, the voltage sensor of this utility model can achieve an accuracy of less than 0.2%.

[0034] Reference Figure 2 By utilizing the voltage sensor circuit of this invention to achieve a miniaturized modular design of the voltage sensor, voltage sensor 1 is placed on the overhead line online integrated monitoring device. Since the voltage sensor of this invention requires only 11 passive components, the overall size of the overhead line online integrated monitoring device is greatly reduced, facilitating its portability. The voltage of the high-voltage input signal is reduced by a voltage divider capacitor; noise and AC components in the reduced-voltage input signal are filtered out by a filter module; the filtered input signal is amplified by a signal amplification module for easy observation; and the output impedance of the circuit is determined by a signal conditioning module, and the phase difference of the operational amplifier output signal is calibrated to achieve monitoring of the high-voltage input signal. Voltage sensor 1 transmits the monitored data to the data processing module of the overhead line online integrated monitoring device. After analyzing and processing the detection data, it is then sent to the staff via the communication module.

[0035] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A voltage sensor circuit for an online integrated monitoring device for overhead lines, characterized in that, It includes voltage divider capacitors, a filter module, an operational amplifier module, a signal conditioning module, an output module, a data acquisition and processing unit, a power supply module, and a wireless communication module, wherein: The first terminal of the voltage divider capacitor is connected to the high-voltage input signal; the second terminal of the voltage divider capacitor is connected to the input terminal of the filter module; the output terminal of the filter module is connected to the input terminal of the operational amplifier module; the output terminal of the operational amplifier module is connected to the input terminal of the signal conditioning module; the output terminal of the signal conditioning module is connected to the input terminal of the output module; the output terminal of the output module is connected to the input terminal of the data acquisition and processing unit, which is used to acquire analog voltage signals and perform analysis and processing; the output terminal of the data acquisition and processing unit is connected to the input terminal of the wireless communication module. The filtering module includes a sixth resistor, a fifteenth capacitor, and a sixteenth capacitor. The first end of the sixth resistor is connected to the second end of the voltage divider capacitor. The second end of the sixth resistor is connected to the first end of the fifteenth capacitor, the first end of the sixteenth capacitor, and the input terminal of the operational amplifier module. The second ends of the fifteenth capacitor and the second ends of the sixteenth capacitor are grounded. The operational amplifier module includes an eighteenth capacitor, a fourth resistor, a fourteenth capacitor, a seventeenth capacitor, a seventh resistor, a fifth resistor, and an operational amplifier. The negative input gain adjustment pin of the operational amplifier is connected to the first terminal of the fourth resistor; the positive input gain adjustment pin of the operational amplifier is connected to the second terminal of the fourth resistor; the differential input negative pin of the operational amplifier is connected to the second terminal of the fifth resistor; the first terminal of the fifth resistor is grounded; the differential input positive pin of the operational amplifier is connected to the second terminal of the sixth resistor; the negative power supply pin of the operational amplifier is connected to the second terminal and negative power supply of the eighteenth capacitor; the first terminal of the eighteenth capacitor is grounded; the positive power supply pin of the operational amplifier is connected to the first terminal and positive power supply of the fourteenth capacitor; the second terminal of the fourteenth capacitor is grounded; the reference voltage input pin of the operational amplifier is connected to the first terminal of the seventeenth capacitor and the first terminal of the seventh resistor; the second terminals of the seventeenth capacitor and the second terminal of the seventh resistor are grounded; the output pin of the operational amplifier is connected to the first terminal of the eighth resistor. The signal conditioning module includes an eighth resistor, a ninth resistor, and a nineteenth capacitor. The first end of the eighth resistor is connected to the output terminal of the operational amplifier. The second end of the eighth resistor is connected to the first end of the ninth resistor, the first end of the nineteenth capacitor, and the signal output interface of the output module. The second end of the ninth resistor and the second end of the nineteenth capacitor are grounded.

2. The voltage sensor circuit of the overhead line online integrated monitoring device according to claim 1, characterized in that, The fifteenth capacitor and the sixteenth capacitor form a multi-capacitor parallel connection, used to filter out noise and AC components in the high-voltage input signal.

3. The voltage sensor circuit of the overhead line online integrated monitoring device according to claim 1, characterized in that, The fourth and fifth resistors are operational amplifier adjustment resistors, which together adjust the gain of the operational amplifier.

4. The voltage sensor circuit of the overhead line online integrated monitoring device according to claim 1, characterized in that, The seventh resistor and the seventeenth capacitor form an RC parallel network to provide the midpoint voltage.

5. The voltage sensor circuit of the overhead line online integrated monitoring device according to claim 1, characterized in that, The ninth resistor and the nineteenth capacitor form an RC parallel network, which is used to determine the output impedance and calibrate the output phase difference.

6. The voltage sensor circuit of the overhead line online integrated monitoring device according to claim 1, characterized in that, The eighth resistor and the ninth resistor are used to adjust the output voltage amplitude.

7. The voltage sensor circuit of the overhead line online integrated monitoring device according to claim 1, characterized in that, The fourteenth and eighteenth capacitors are filter capacitors, used to filter out noise and AC components in the positive and negative power supplies, respectively.

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