電缆故障定点仪毕业专业论文.docVIP

电缆故障定点仪毕业论文 摘 要 随着社会的发展，人们对电力输电的要求越来越高，为了避免在地面上错综复杂的电线对人们的生活带来不便，在城市中大量的使用地埋电缆，地埋电缆线一旦发生故障，电力的维修的首要任务是精确定出地埋电缆的故障点。本文根据电缆故障点高压放电时产生的声音和磁信号，计算出磁、声信号到达接收端的时间差，可快速准确地找到故障点。 本文针对上述需求，用能响应微弱振动的压电陶瓷探头探测高压放电时产生的（振动）声音信号，用磁棒线圈探测高压放电时产生的电磁信号，设计了微弱振动信号的低噪声带通放大和50H陷波的模拟放大电路，和兼备电缆路径探测与声磁同步定点的磁感应信号放大电路等硬件系统，以及相应功能的软件。实验结果证明，该仪器对达到了地埋电缆电缆故障点定点效果良好，且具有环境噪音屏蔽。 关键词：电缆故障定点仪 声磁时间差 50Hz陷波 Abstract With the development of society, peoples requirement of power transmission is higher and higher, in order to avoid the inconvenience of intricate wire on the ground in peoples lives,people increasingly prefer to cover the cable under the ground .But ,come problems at the same time ,if the cable under the ground has any faults,it is very difficult to recognise where points of fault are located from the ground, which leads to inconvenience for electrical maintenance . Based on the signal of sound and magnetism which emerges when high voltage discharging on point of fault in the cable , and calculation the time difference between magnetic signal and sound signal to reach the receiver, you can quickly and accurately find the point of failure. In response to these needs, the response to the weak vibration of piezoelectric ceramic probe to detect the high-pressure discharge (vibration), sound signals, electromagnetic signals generated when the bar magnet coil to the detection of high-pressure discharge, design the low noise of the weak vibration signal the vocal cords passenlarge and 50HZ notch analog amplifier circuit, and both the synchronization point magnetic induction signal in the cable path detection and sound, and magnetic amplifier hardware system, and the corresponding features of the software.The experiment shows that the instrument can quickly and accurately fix the point of cable fault .And ,what`s more ,it has the characteristics of ambient noise shielding and automatically mute when people touch close to it. Keywords: Cable faults tester Time difference between sound and