Research And Application Of The Monitoring System Of Power Cable Fault Location

At present,the production process of industrial enterprises is highly dependent on the power supply system.The stability of the power supply system is very important for the normal production of the enterprise.When the power supply of the enterprise fails,the fault can be located in the first time to solve the problem,which is very helpful to reduce the economic loss of the enterprise.However,the current power cable fault location system has large positioning error,which can not help the staff to solve the problem in the shortest time,so this thesis will upgrade the power cable fault location system.The existing power cable fault location system is based on traveling wave algorithm,which has the problems of low fault location accuracy and aging components.Based on the analysis of the principle of four kinds of traveling wave fault location algorithms,it is determined that the reason for the large system error is the refraction and reflection of traveling wave when it is transmitted in the faulty cable,so that the characteristics of the effective wave head are not obvious and the fault location error is large.To solve this problem,BP neural network algorithm was proposed to extract the features of the effective wave head,and then combined with traveling wave algorithm to locate the fault.However,BP neural network algorithm has the problems of slow convergence speed and large fitting curve error.In this thesis,LM algorithm was used to improve these problems first,and then the simulation test showed that the improved BP neural network algorithm could greatly improve the convergence speed and greatly reduce the fitting curve error,which could meet the use requirements.Aiming at the problem of component aging,the hardware circuit of current traveling wave acquisition unit and intelligent comprehensive analysis unit was selected and designed again,and the software program of these two devices was designed.On the basis of these works,this thesis tested the power cable fault location system in the laboratory and practical application.In the laboratory test,the anti-interference ability and fault location accuracy were tested.The test results showed that the system could run stably and the location accuracy is greatly improved.In the practical application test of a steel plant,the system could accurately alarm the cable fault location.The power cable fault location system studied in this thesis can achieve the expected results through theoretical analysis and test analysis.