基于振动信号的断路器刚分刚合点计算方法OA

Aiming at the problem that the contact opening and closing moment of the circuit breaker can not be diret-ly monitored online in power system,in this paper a method for calculating these moments is proposed based on the composite analysis method of short-time energy and sound pressure.After collecting the vibration signal of the circuit breaker through the acceleration sensor,the sound pressure signal is firstly used to determine the area range of the in-stant opening and closing operation.Then,the contact openign and closing moments are accurately determined by the first intersection of the short-time energy and the preset threshold.The method effectively solves the problem that the traditional calculation method fails due to the differences in the operating mechanism,installation position and instal-lation method of sensor.In this study the off line measurement is performed in combination with a high-voltage switch tester,and the time coordinates is unified to obtain the accurate contact opening and closing moments as the experi-mental reference.The experimental results show that the calculation error is controlled within 1 ms,which verifies both accuracy and practicality of the method.The study in this paper not only provides an efficient and accurate calcu-lation method,but also a solution for optimization of the control performance of the phase-selection swiching device.