Fault Location Algorithms For HV Transmission Lines

High voltage transmission can easily get into trouble because of the long transmitting distance, the complexity of geology or meteorology and many other causes. Fault location techniques are used to accurately detect the fault on a transmission. It can relief the burdens of patrol personnel and reduce economic losses. Fault location plays an important role in improving security and stabilization of power system.Based on widely reading domestic and international literatures of transmission line fault location, this paper discusses the fault location algorithms for high voltage transmission.This paper introduces the impedance location algorithm, traveling wave location algorithm and intelligence location algorithm. It analyzes the single-ended impedance location algorithm, two-terminal impedance ranging algorithm and the reasons for the range accuracy of the algorithms. At last, the commonly used algorithms are simulated.T-Transmission system will be used widely. But it’s different from two-end transmission system. This paper analyzes two types of T-Transmission location algorithms and compares the advantages and disadvantages. The algorithm based on identifying the fault line are simulated by individually using circuit with concentrated parameters and circuit with distribution parameter.A method of fault location based on ant colony algorithm for high voltage transmission double-nonsynchronization algorithm is present. The ant colony algorithm is introduced to resolve the fault location function optimization problems. To eliminate the effect of untransposed conductors and unbalanced transmission line impedances, phase components are transformed to model components. To reduce the impact of the transient component, Fourier compensation algorithm is used.A HV power system are built using simulation tool ATP, from which we can get voltage and current signal in various fault conditions. Based on Matlab platform, the fault distance is calculated using ant colony algorithm for high voltage transmission double-nonsynchronization algorithm. At last, the simulation based on a 750KV transmission system model is presented to demonstrate that the algorithm is of high accuracy and not affected by fault type, system impedance, fault resistance, unsynchronized angle. The method has high practical value.