The "Charge Integration Method" to Detect Earth Faults in Compensated Networks

The rapid localization of ground faults in compensated overhead line networks at medium-voltage level presents challenges for network operators. Existing fault detection methods cannot be used in overhead line indicators because the high-precision voltage measurement required for this is not possible with state-of-the-art technology. The focus of this paper is the development of an innovative fault direction algorithm for compensated networks. This is realized considering the measurement accuracy of voltage sensors of overhead line indicators. A method for correct statements about the fault direction without knowledge of the zero-sequence voltage working in many scenarios is developed and presented. The new method is successfully validated in simulation networks. At last, the results, advantages and disadvantages of this method are discussed.