Search

CN-224231834-U - Voltage sensor circuit of on-line comprehensive monitoring device for overhead line

CN224231834UCN 224231834 UCN224231834 UCN 224231834UCN-224231834-U

Abstract

The utility model discloses a voltage sensor circuit of an on-line comprehensive monitoring device for an overhead line, which comprises a voltage dividing capacitor, a filtering module, an operational amplification module, a signal conditioning module and an output module, wherein a first end of the voltage dividing capacitor is connected with a high-voltage input signal, a second end of the voltage dividing capacitor is connected with an input end of the filtering module, an output end of the filtering module is connected with an input end of the operational amplification module, an output end of the operational amplification module is connected with an input end of the signal conditioning module, and an output end of the signal conditioning module is connected with the output module. The voltage sensor can be miniaturized and modularized by using the utility model. The utility model can be widely applied to the technical field of sensors.

Inventors

  • HE PENGFEI

Assignees

  • 湖南美志科技有限公司

Dates

Publication Date
20260512
Application Date
20250514

Claims (7)

  1. 1. The utility model provides a voltage sensor circuit of overhead line on-line integrated monitoring device which characterized in that includes partial pressure electric capacity, filter module, operational amplification module, signal conditioning module, output module, data acquisition and processing unit, power module and wireless communication module, wherein: The device comprises a voltage dividing capacitor, an operational amplification module, a signal conditioning module, a data acquisition and processing unit, a wireless communication module, a data acquisition and processing unit and an operational amplification module, wherein the 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, the output end of the signal conditioning module is connected with the input end of the output module, the output end of the output module is connected with the input end of the data acquisition and processing unit, and the data acquisition and processing unit is used for acquiring and analyzing analog voltage signals; the filtering module comprises a sixth resistor, a fifteenth capacitor and a sixteenth capacitor, and a first end of the sixth resistor is connected with a second end of the voltage dividing capacitor; the second end of the sixth resistor is connected with the first end of the fifteenth capacitor, the first end of the sixteenth capacitor and the input end of the operational amplification module; The operational amplification module comprises an eighteenth capacitor, a fourth resistor, a fourteenth capacitor, a seventeenth capacitor, a seventh resistor, a fifth resistor and an operational amplifier, wherein a negative input gain adjustment pin of the operational amplifier is connected with a first end of the fourth resistor, a positive input gain adjustment pin of the operational amplifier is connected with a second end of the fourth resistor, a differential input negative electrode pin of the operational amplifier is connected with a second end of the fifth resistor, a first end of the fifth resistor is grounded, a differential input positive electrode pin of the operational amplifier is connected with a second end of the sixth resistor, a negative power supply pin of the operational amplifier is connected with a second end of the eighteenth capacitor and a negative power supply, a first end of the eighteenth capacitor is grounded, a positive power supply pin of the operational amplifier is connected with a first end of the fourteenth capacitor and a positive power supply, a second end of the fourteenth capacitor is grounded, a reference voltage input of the operational amplifier is connected with a first end of the seventeenth capacitor and a first end of the seventh resistor, a second end of the seventeenth capacitor is connected with an eighth end of the eighth resistor, and an eighth end of the operational amplifier is connected with the eighth end of the seventeenth resistor; The signal conditioning module comprises an eighth resistor, a ninth resistor and a nineteenth capacitor, wherein the first end of the eighth resistor is connected with the output end of the operational amplifier, the second end of the eighth resistor is connected with the first end of the ninth resistor, the first end of the nineteenth capacitor and the signal output interface of the output module, and the second end of the ninth resistor and the second end of the nineteenth capacitor are grounded.
  2. 2. The voltage sensor circuit of the on-line integrated overhead line monitoring device according to claim 1, wherein the fifteenth capacitor and the sixteenth capacitor form a multi-capacitor parallel connection for filtering clutter and alternating current components in the high-voltage input signal.
  3. 3. The voltage sensor circuit of the on-line integrated overhead line monitoring device according to claim 1, wherein the fourth resistor and the fifth resistor are operational amplifier adjusting resistors, and the gains of the operational amplifiers are adjusted together.
  4. 4. The voltage sensor circuit of the on-line integrated overhead line monitoring device according to claim 1, wherein the seventh resistor and the seventeenth capacitor form an RC parallel network for providing the midpoint voltage.
  5. 5. The voltage sensor circuit of the on-line integrated overhead line monitoring device according to claim 1, wherein the ninth resistor and the nineteenth capacitor form an RC parallel network for determining an output impedance and calibrating an output phase difference.
  6. 6. The voltage sensor circuit of the on-line integrated overhead line monitoring device according to claim 1, wherein the eighth resistor and the ninth resistor are used for adjusting the amplitude of the output voltage.
  7. 7. The voltage sensor circuit of the on-line integrated overhead line monitoring device according to claim 1, wherein the fourteenth capacitor and the eighteenth capacitor are filter capacitors for filtering clutter and ac components in the positive power supply and the negative power supply, respectively.

Description

Voltage sensor circuit of on-line comprehensive monitoring device for overhead line Technical Field The utility model relates to the technical field of sensors, in particular to a voltage sensor circuit of an on-line comprehensive monitoring device for an overhead line. Background The on-line comprehensive overhead line monitoring device is intelligent equipment for monitoring the running state of a power transmission line in real time, and aims to improve the safety of a power grid, prevent faults and optimize operation and maintenance efficiency. The on-line comprehensive monitoring device for the overhead line relies on a voltage sensor arranged on the on-line comprehensive monitoring device to detect the voltage signal of the line in real time, but the existing voltage sensor circuit usually comprises a signal sensing unit, a high-impedance front end, a signal conditioning circuit, a digital-to-analog conversion and power supply system. Because of contradiction between the electrode size and the sensitivity of the signal sensing unit, the coil has large volume, the high-impedance front end needs high-voltage power supply, the space occupation ratio of the discrete JFET to the PCB exceeds 40%, the signal conditioning circuit needs to process multi-stage amplification and band-pass filtering, the number of passive components is more than 20, and the volume of the power supply module exceeds 30% of the space occupation ratio of the PCB. Therefore, the existing electronic voltage sensor is bulky in volume and cannot meet the small-sized modular requirements of the on-line integrated overhead line monitoring device in the fields of high-voltage power grid monitoring, distributed intelligent grid-connected monitoring and the like. Disclosure of utility model In order to solve the technical problems, the utility model aims to provide a voltage sensor circuit of an online comprehensive monitoring device for an overhead line, which can realize small modularization of an electronic voltage sensor. The utility model adopts the technical scheme that the voltage sensor circuit of the overhead line on-line comprehensive monitoring device comprises a voltage dividing capacitor, a filtering module, an operational amplification module, a signal conditioning module, an output module, a data acquisition and processing unit, a power module and a wireless communication module, wherein: The device comprises a voltage dividing capacitor, an operational amplification module, a signal conditioning module, a data acquisition and processing unit, a wireless communication module, a data acquisition and processing unit and an operational amplification module, wherein the 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, the output end of the signal conditioning module is connected with the input end of the output module, the output end of the output module is connected with the input end of the data acquisition and processing unit, and the data acquisition and processing unit is used for acquiring and analyzing analog voltage signals; the filtering module comprises a sixth resistor, a fifteenth capacitor and a sixteenth capacitor, and a first end of the sixth resistor is connected with a second end of the voltage dividing capacitor; the second end of the sixth resistor is connected with the first end of the fifteenth capacitor, the first end of the sixteenth capacitor and the input end of the operational amplification module; The operational amplification module comprises an eighteenth capacitor, a fourth resistor, a fourteenth capacitor, a seventeenth capacitor, a seventh resistor, a fifth resistor and an operational amplifier, wherein a negative input gain adjustment pin of the operational amplifier is connected with a first end of the fourth resistor, a positive input gain adjustment pin of the operational amplifier is connected with a second end of the fourth resistor, a differential input negative electrode pin of the operational amplifier is connected with a second end of the fifth resistor, a first end of the fifth resistor is grounded, a differential input positive electrode pin of the operational amplifier is connected with a second end of the sixth resistor, a negative power supply pin of the operational amplifier is connected with a second end of the eighteenth capacitor and a negative power supply, a first end of the eighteenth capacitor is grounded, a positive power supply pin of the operational amplifier is connected with a first end of the fourteenth capacitor and a positive power supply, a second end of the fourteenth capacitor is grounded, a