Partial discharge detection in modern power grid

Liška, Jindřich; Jakl, Jan; Kunkel, Sven; Stastny, Ladislav; Mego, Roman

doi:10.1109/diagnostika55131.2022.9905175

Cited by 1 publication

(1 citation statement)

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“…During the operation of the power system, most parts are often integrated inside the switchgear, such as vacuum circuit breakers, current transformers, other auxiliary switches, and so on. At the same time, inappropriate installation, manufacturing defects, and frequent switching can lead to gradual increases in the insulation fault rate of the gas-insulated switchgear (GIS) [1][2][3]. Inside the GIS, the electric field strength of the defects increases because of the bubbles in the dielectric metal particles in the chamber, and spike of the conductor.…”

Section: Introductionmentioning

confidence: 99%

Hardware and Software Design of Programmable Medium and High-Speed Data Acquisition (DAQ) Board of Fiber Optic Signal for Partial Discharge Acquisition

Tong,

Zhang,

Zhang

2024

Electronics

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The anti-electromagnetic interference capability of partial discharge (PD) acoustic signal conversion and collection circuits severely restrict the sensitivity of PD detection. The data acquisition (DAQ) systems available in the current market are costly and have limited functionality, making it difficult to satisfy the acquisition requirements for PD detection. This paper proposes a medium to high-speed fiber optic signal acquisition board with an adjustably controlled sampling rate and filter cutoff frequency. The circuit achieves a higher signal-to-noise (SNR) ratio by distributing the noise in each part of the signal acquisition chain reasonably. The temperature characteristics of the acquisition module are improved by utilizing the programmable T-type structure for transimpedance amplification of photocurrent. The DAQ card performs data acquisition and processing using STM32H743 internal ADC and caches data in bulk with an SRAM and SD card. A data uploading method based on time reference has been proposed, which enables full, effective information signal upload through a low-cost transmission interface. The research ultimately achieves a stable sampling of three channels at 1 MSps, SNR of 63 dB, and programmable gain amplification of the photocurrent with 0–60 dB. Finally, the system is used for PD acoustic signal acquisition in the frequency range of 20 Hz to 100 kHz.

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Section: Introductionmentioning

confidence: 99%