A Transformer Partial Discharge Measurement System Based on Fluorescent Fiber

Abstract

Based on the physical phenomena of optical effects produced by the partial discharge (PD) and on the characteristics of fluorescent fiber sensing of weak fluorescent signals, a PD measurement system using a fluorescent fiber sensor was designed. The main parameters of the sensing system were calculated, an experimental testing platform for PD simulation in the lab was established, and PD signals were then detected through ultra-high frequency (UHF) and optical methods under a needle-plate discharge model. PD optical pulses in transformer oil contained signal-peak and multi-peak pulse waveforms. Compared with UHF detection results, the number of PD pulses and the elapsed PD pulse phase time revealed a good corresponding relationship. However, PD signal amplitudes presented the opposite, thus indicating that PD UHF signals reflected pulse amplitude value, whereas PD optical signals reflected pulse energy magnitude. The n-u-φ three-dimensional distributions indicated that most of the PD signals concentrated in the nearby industrial frequency voltage peak value. Overall, the proposed fluorescent fiber sensing system design can be used successfully in transformer PD signal detection.

An optimized method of partial discharge data retrieval technique for phase resolved pattern

“…The raw PD data from the interfacing circuit were transferred into the computer memory, and data storage system for further analysis and also could be recalled as needed. [11][12][13][14][15][16]. As ADC speed increased rapidly, the ability of digital oscilloscopes is also increasing as well.…”

Statistical Analysis of Partial Discharges in SF6 Gas via Optical Detection in Various Spectral Ranges

“…Micro-optical sensors and fluorescence fibers that can be installed inside equipment have shown great application potential in this regard [12,13]. For PDs occurring in SF6-gas-insulated systems, light is produced as a result of various ionization, excitation, and recombination processes occurring during corona in SF6 with its characteristic spectrum.…”

“…With evolution in optical technologies, optical PD detection can be used as not only an ancillary means in laboratory studies but also renders its considerable potential in PD diagnosis of actual power equipment such as gas-insulated switchgear/transmission lines (GIS/GILs) and oil-insulated transformers while offering the advantages of EM-interference-free operation and adjustable gain. Micro-optical sensors and fluorescence fibers that can be installed inside equipment have shown great application potential in this regard [12,13]. For PDs occurring in SF 6 -gas-insulated systems, light is produced as a result of various ionization, excitation, and recombination processes occurring during corona in SF 6 with its characteristic spectrum.…”

Influences of Traction Load Shock on Artificial Partial Discharge Faults within Traction Transformer—Experimental Test for Pattern Recognition

“…The PD incipient voltage would decline with an increase in THD, the PD phase distribution and its amplitude would be distorted, and the statistical parameters would be also affected [21,26]. To observe the PD activity under harmonic AC voltages, metal particles were mixed in oil.…”

“…• Cavity discharge (partial discharge in spherical cavities or gaps within a solid dielectric material) within insulation papers or pressboards [13][14][15][16][17][18][19][20][21], • Surface discharge in oil [13][14][15][16], • PD due to floating particles in oil [17,22], • Air bubble discharge in oil [14,17,22,23], • PD due to bad grounding (metal-to-metal discharge) [13], and • Oil wedge or metal protrusions caused PD in pure oil [13,22,[24][25][26][27].…”