基于有限元仿真的换流变升高座超声波与特高频电磁波故障信号研究
Study on Fault Signals of Ultrasonic and UHF Electromagnetic Waves in the Elevated Seat of Converter Transformer Based on Finite Element Simulation
吕黎黎 1陈跃 1李继初 1周雪影1
作者信息
- 1. 广西电网有限责任公司来宾供电局,广西 来宾 546100
- 折叠
摘要
高压换流变的安全可靠运行是高压电网稳定的前提和根本保证.本文针对高压换流变升高座中的常见故障,基于COMSOL有限元仿真软件建立模型,依据实际局部放电源建立局部放电故障点,对升高座的薄弱位置进行了超声波仿真与电磁仿真,仿真结果表明局部放电产生的平均声压与电场强度存在明显的区别,内部的平均声压与电场强度远高于升高座外部;超声波与电磁波经过升高座外壁之后均会严重衰减,但超声波的衰减程度远远高于电磁波;套管的下部密封处、上部密封处与观察窗均存在明显超声波的泄漏,而电磁波的泄漏主要发生在观察窗处,其次发生在套管下部的密封处.本研究为之后实际升高座的传感器的选型与布置提供了理论支持.
Abstract
The secure and reliable operation of high-voltage converters is a prerequisite and fundamental guarantee for the stability of high-voltage power grid.In this paper,aiming at the common faults in the elevated seat of converter transformer are focused on in this paper.Based on COMSOL finite element simulation software,a model of the elevated seat of high-voltage converter transformer is established using COMSOL finite element simulation softwave,partial discharge fault points are established based on actual partial discharge sources and ultrasonic and electromagnetic simulations are conducted on the weak positions of the elevated seat.The simulation results show that there is a significant difference between the average sound pressure and the electric field intensity generated by partial discharge;the average sound pressure and electric field intensity inside are much higher than those outside the elevated seat;Both ultrasonic and electromagnetic waves undergo severe attenuation after passing through the outer wall of the raised seat,but the attenuation degree of ultrasonic is much higher than that of electromagnetic waves;there is significant ultrasonic leakage at the lower sealing area,upper sealing area,and observation window of the casing,while electromagnetic wave leakage mainly occurs at the observation window,followed by the sealing area at the lower part of the casing.This study provides theoretical support for the selection and arrangement of sensors for actual elevated seats in the future.
关键词
有限元仿真/局部放电/超声波/电磁波Key words
finite element simulation/partial discharge/ultrasound/electromagnetic wave引用本文复制引用
出版年
2024
NETL
NSTL
万方数据