Dynamic Characteristics Simulation of Vacuum Interrupter of On-Load Tap Changer

Wang, Ke; Zhang, Shuqi; Li, Gang; Sui, Huaze; Zhang, Yao; Li, Jinzhong; Li, Geqi; Wang, Ruoxi

doi:10.1109/ichve53725.2022.9961736

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…The mechanical faults of the OLTC included drive mechanism faults (e.g., trip over stop, refusal to move, parts loosening, parts falling off, spindle deformation, and jamming), switching mechanism faults (e.g., spring fatigue, spring breakage, parts loosening, parts falling off, and mismatching between the groove and wheels), and selection mechanism faults (e.g., parts loosening, parts falling off, parts distorted and deformed, and unbalanced operation of the switch) [32][33][34][35][36]. Some of these faults were mainly reflected in the energy storage segment, some were reflected in the switching segment, and others affected the whole process.…”

Section: Sample Descriptionmentioning

confidence: 99%

A Segmented Preprocessing Method for the Vibration Signal of an On-Load Tap Changer

2021

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The vibration signal of an on-load tap changer (OLTC) consists of a series of sharp vibration bursts, and its fault feature in certain periods is easily missed. This study considered that preprocessing the vibration signal of the OLTC in segments could effectively solve the aforementioned problem. First, the collection of the signal is discussed, the waveform characteristics of the vibration signal when the OLTC was in normal action was described, and the selection of the signal was analyzed. Second, the time domain characteristics and frequency spectrum analyses were carried out to demonstrate the necessity of segmented preprocessing. Further, the segmented preprocessing method for the vibration signal of the OLTC was presented. Finally, the main mechanical faults of the OLTC were simulated, and the vibration signals were collected to carry out the fault diagnosis experiment on the OLTC. The experimental results showed that the accuracy of the fault diagnosis increased from 94.30% of the nonsegmented preprocessing to 98.46% of the segmented preprocessing. The increase was greater, especially for contact wear faults. The method was successfully applied to the actual project.

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Section: Sample Descriptionmentioning

confidence: 99%

A Segmented Preprocessing Method for the Vibration Signal of an On-Load Tap Changer

2021

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“…In Refs. [7][8][9][10], the effects of oil temperature, bubble volume, and transformer oil flow rate on bubble deformation and electric field distribution were studied, with the actual operating conditions of the OLTC used as the boundary conditions. It was found that when the interturn field strength reached the breakdown field strength of the bubble, both bubbles might discharge, thereby increasing the probability of oil gap discharge.…”

Section: Introductionmentioning

confidence: 99%

Erosion Characteristics of Oil-Immersed On-Load Tap Changer Contacts Under Varying Contact Speeds and Pressures

Li,

Kang

et al. 2024

Chin. J. Electr. Eng.

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With the growing demand for precise voltage adjustment and reactive regulation, the frequent operation of on-load tap changers (OLTCs) in oil-immersed systems has led to increased erosion of switch contacts by arcs during the switching process. This erosion causes significant wear on the contacts, thereby reducing their lifespan. Therefore, the present study aims to investigate the behavior and mechanism of arc erosion on contact surfaces in oil-immersed OLTCs. To achieve this, a self-designed friction and wear test device for OLTC contacts was utilized to conduct experiments at various sliding speeds and contact pressures. Additionally, finite element analysis was employed to validate the experimental results regarding the influence of sliding speed on arc energy. The surface morphology of the contacts was observed using an optical microscope. The findings revealed that as the sliding speed increased, the arc energy, arc initiation rate, and contact resistance initially exhibited an upward trend, then decreased, and eventually increased again. The minimum values were observed at a sliding speed of 90 mm/s. Moreover, the arc energy, arc initiation rate, and contact resistance decreased gradually as the contact pressure increased. After reaching a contact pressure of 1.5 N, the variation in the arc energy stabilized. At lower contact pressures, arc erosion dominated the wear on the contact surface. However, at higher contact pressures, the wear transitioned from predominantly arc erosion to a combination of mechanical wear and arc erosion. In summary, experimental and analytical investigations provided insights into the effects of sliding speed and contact pressure on the behavior of arc erosion, contact resistance, and surface damage of OLTC contacts in oil-immersed systems.

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“…In recent years, the advancement of vacuum technology has driven the application of vacuum on-load tap changers. The arcs generated by vacuum circuit breakers do not interact with the medium, effectively avoiding the phenomenon of mineral oil carbonization [6,7]. Compared to traditional circuit breakers, vacuum circuit breakers have a longer lifespan, resulting in a significant reduction in maintenance frequency for vacuum on-load tap changers [7,8].…”

Section: Introductionmentioning

confidence: 99%

Analysis and Optimization of Contact Material Ablation under the Cumulative Effect of the Number of Breakings of OLTC

Zhang,

Tan,

Yang

et al. 2023

Materials

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Vacuum on-load tap-changers (OLTC) for converter transformers have a much higher number of breakings than conventional circuit breakers. Contact ablation after several breakings will affect the stability and life of the device. This paper establishes the electromagnetic thermal multi-physical field coupling model of the vacuum interrupter for OLTC based on the finite element analysis method. The thermal field distribution of normal and ablative contact materials during the breaking process was analyzed. The key parameters affecting the contact temperature under the cumulative number of breakings are analyzed and the optimized design is completed. The simulation results show that the contact surface reaches a maximum temperature of 1390 K at 8 ms. There is a significant increase in the area of the high-temperature area on the contact surface. The possibility of re-ignition of the interrupter is increased. Based on the judgment matrix method, the key influencing parameters of the contact temperature rise are analyzed. The final parameters are selected as follows: contact material—CuCr8 alloy, contact seat thickness—2 mm, contact thickness—10 mm, and contact diameter—40 mm.

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Dynamic Characteristics Simulation of Vacuum Interrupter of On-Load Tap Changer

Cited by 4 publications

References 2 publications

A Segmented Preprocessing Method for the Vibration Signal of an On-Load Tap Changer

A Segmented Preprocessing Method for the Vibration Signal of an On-Load Tap Changer

Erosion Characteristics of Oil-Immersed On-Load Tap Changer Contacts Under Varying Contact Speeds and Pressures

Analysis and Optimization of Contact Material Ablation under the Cumulative Effect of the Number of Breakings of OLTC

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