Design and Debugging of GIS fault fast positioning system based on PVDF piezoelectric film sensor

Abstract

This paper introduces an acoustic emission sensor using PVDF Piezoelectric film which is c onvenient to use in the field. In order to verify the reliability of GIS fault fast positioning system ba sed on PVDF piezoelectric film sensor, four different kinds of typical defects were set, and the practical research on GIS flashover positioning was carried out. The result shows that by comparing s ound intensity of different gas rooms, GIS fault fast positioning system based on PVDF piezoelectric film sensor, the fault location can be found accurately. I ntroduction In AC withstand voltage test of GIS, restricted by field condition, The location of the GIS flashover and puncture was mainly judged by human ear or ultrasonic locator and ultra high frequency locator. Ultrasonic locator and ultra high frequency locator were mostly limited by the number of sensor channels, meanwhile, the cost of the instrument was high and inconvenient to carry. Therefore, they can not be widely used in the field. As a result, it is urgent to study a flashover and breakdown of the gas chamber fault location system which can locate accurately and is practical, low power consumption, portable, and with signal displaying. Compared with the conventional piezoelectric materials, PVDF piezoelectric film materials have m any advantages such as: wide frequency response, high mechanical performance, light weight, good flexibility, less susceptible to pollution by water and chemicals, strong plasticity and so on, have been widely used in various industry fields(1-3). Extensive applications showed that the sensor made of this material has high sensitivity, overload resistance, good anti- interference simple operation, small v olume, and light weight(4,5). This paper designs a kind of flashover positioning system based on PVDF piezoelectric film sensor, which can quickly and accurately locate the discharge position by collecting and comparing the intensity of the acoustic signal from different sensor when the breakdown or flashover happened.