Aiming to simultaneously detect mechanical and insulation defects in gas insulated switchgear(GIS),this paper proposes a low-power smart wireless vibration acceleration-acoustic emission combined sensor.The design and simulation verification of the sensor fusion structure are conducted,utilizing bluetooth low energy(BLE)to establish communication between the sensor and the client.For the first time,pseudo-random M-sequences are applied to the impedance response self-calibration of a piezoelectric sensor,requiring only milliseconds and milliwatts for a single calibration.The test results show that the average vibration sensitivity of the sensor is 511 mV/g within the frequency range of 100 Hz to 2 kHz,and the ultrasonic sensitivity is stabilized between 70 to 90 dB within the frequency range of 20 to 100 kHz,with a relative uncertainty of less than 2%.The data transmission rate exceeds 1 Mbps when the working distance is less than 8 m.A combined mechanical vibration-partial discharge test is conducted on the actual GIS equipment installed with metal particle defects.The results demonstrate that the sensor can achieve simultaneous and co-located measurement of mechanical vibration and ultrasonic signals from the equipment.This offers a novel and efficient approach for distributed detection of the operational status of power equipment.
GIS defect detectionlow power consumptionsmartwirelessvibration acceleration-acoustic emission combined sensor
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维普
