Improving the accuracy of fault detection location by application of unconventional measuring transformers

One of the main requirements to the methods and means of fault detection location in the power transmission lines is their satisfactory accuracy. This accuracy is limited by the accuracy class of the current and voltage measuring instruments and parameter reliability of power transmission lines. The paper presents the reasons for the low accuracy of current and voltage measuring transformers used in practice in the high voltage power networks. To solve the fault detection location problem, it is proposed to use unconventional measuring means with linear frequency response in a sufficiently wide range of frequencies and current and voltage changes corresponding to the short-circuit mode. These devices require a non-traditional installation: directly on the power line wires. Taking into account the characteristics of unconventional measuring means, a method for determining the parameters of transmission lines in operating conditions, and a procedure for calculation of the short-circuit point distance are proposed. The experiment simulated in a computer has shown sufficient accuracy of the suggested procedure.