一种柱上变压器内部局放检测的声纹信号采集电路
By designing an acoustic signature signal acquisition circuit for partial discharge detection inside a pole-mounted transformer, the problem of needing to shut down and disassemble the pole-mounted transformer for partial discharge detection was solved. This enabled real-time, low-noise signal acquisition and processing, reduced hardware costs, improved analog signal quality, and simplified system maintenance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING SATURN INFORMATION TECH CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-07-17
AI Technical Summary
Existing methods for detecting partial discharge in pole-mounted transformers require power outages and transformer disassembly, which are cumbersome and lack real-time detection capabilities.
A sound signature signal acquisition circuit for partial discharge detection inside a pole-mounted transformer was designed, including a low-noise power supply unit, a signal matching unit, a signal anti-aliasing unit, a programmable gain unit, a signal analog-to-digital conversion unit, and a signal processing unit, to realize low-noise signal acquisition and real-time data processing.
It achieves low-noise signal acquisition, reducing noise crosstalk; it achieves independent analog and digital power supplies, reducing hardware costs; it optimizes signal conditioning; and it incorporates multi-stage filtering and programmable gain units. The combination of multi-stage filtering and programmable gain units adapts to different audioprint scenarios. The differential analog-to-digital converter improves analog signal quality. The system has high integration, a built-in wireless transmission module for direct transmission of processing results, simplifies external communication circuits, and peripheral storage supports software upgrades, configuration storage, and data logging, enhancing system maintainability.
Smart Images
Figure CN224518892U_ABST
Abstract
Claims
1. A voiceprint signal acquisition circuit for detecting internal partial discharge of a pole-mounted transformer, characterized in that, include: The low-noise power supply unit includes a lithium battery for power supply. The lithium battery supplies power to analog circuits and digital circuits respectively via a power management chip, a low-dropout linear regulator, a boost switching regulator, an adjustable linear regulator, a high-precision reference voltage source, and a low-noise operational amplifier. The signal matching unit, including a follower circuit composed of a DC blocking capacitor and a precision operational amplifier, is used to achieve DC isolation and high / low impedance matching of the acoustic signature signal; The signal anti-aliasing unit includes a multi-stage Butterworth low-pass filter composed of low-noise operational amplifiers, used to filter out high-frequency noise; The programmable gain unit, including a programmable gain amplifier and its control circuit, is used to provide a variety of gain configurations that can be adjusted in real time by a microcontroller; The signal analog-to-digital conversion unit, including an analog-to-digital conversion chip, is used to convert analog signals into digital signals and transmit them via SPI; The signal processing unit includes a microcontroller and a wireless communication module, wherein the microcontroller is used to process digital signals and the wireless communication module is used to transmit data.
2. The acoustic signature signal acquisition circuit for partial discharge detection inside a pole-mounted transformer according to claim 1, characterized in that, The power management chip outputs 5.3V and 3.3V power, with 5.3V used for analog unit power supply and 3.3V used for digital circuit power supply.
3. The acoustic fingerprint signal acquisition circuit for detecting internal partial discharge of a power transformer on pole according to claim 1, wherein, The multi-order Butterworth low-pass filter of the signal anti-aliasing unit has a passband of 0~60kHz and an attenuation of ≥40dB at a stopband of 130kHz, matching the sampling rate of the analog-to-digital conversion unit.
4. The acoustic fingerprint signal acquisition circuit for detecting internal partial discharge of a power transformer on pole according to claim 1, wherein, The programmable gain amplifier of the programmable gain unit supports eight gain configurations: 0, 1, 2, 5, 10, 20, 50, and 100 times, which are dynamically adjusted by the microcontroller according to the signal strength.
5. The acoustic fingerprint signal acquisition circuit for detecting internal partial discharge of a power transformer on pole according to claim 1, wherein, The analog-to-digital conversion chip of the signal analog-to-digital conversion unit is a 16-bit ADC with a sampling rate of 96kHz, which transmits digital signals through a four-wire SPI interface.
6. The acoustic fingerprint signal acquisition circuit for detecting internal partial discharge of a power transformer on pole as claimed in claim 1 wherein, The microcontroller of the signal processing unit integrates digital filtering and feature extraction functions, and the wireless communication module transmits the processing results to the operator terminal via 2.4G WiFi.
7. The acoustic fingerprint signal acquisition circuit for detecting internal partial discharge of a power transformer on pole as claimed in claim 1 wherein, The 28V power supply of the low-noise power unit can be disconnected, supporting a compatible design for both active and passive acoustic sensors.