Sensitive/stable complementary fault identification scheme for overhead transmission lines

• Published in: IET generation, transmission & distribution transmission & distribution, 2019-08, Vol.13 (15), p.3252-3263
• Main Authors: Zaki, Mohamed I, El Sehiemy, Ragab A, Amer, Ghada M, Abo El Enin, Fathy M
• Format: Article
• Language: English
• Subjects: captured current signals; classification performance; EMTP; fault diagnosis; fault identification process; fault identification sensitivity index; fault location; fault locations; fault types; high fault detection; monitored current fault resistances; mother wavelets; overhead transmission lines; power engineering computing; power overhead lines; power system measurement; power transmission faults; power transmission lines; power transmission protection; Research Article; scheme performance; sensitive/stable complementary fault identification scheme; sensitivity concepts; single end measuring system; stability; triple fed high‐voltage transmission lines; voltage 500.0 kV; voltage measurement; wavelet multiresolution analysis technique; wavelet transforms
• ISSN: 1751-8687; 1751-8695; 1751-8695
• DOI: 10.1049/iet-gtd.2018.5016

This study proposes a complementary fault identification scheme for triple fed high-voltage transmission lines (TFHVTLs). The current signals are captured from a single end measuring system of the TFHVTL. Then, the captured current signals are decomposed using wavelet multi-resolution analysis technique. The proposed scheme is based on two criteria. The first criterion is dependent on the level of detail coefficients while the second one is dependent on the deviation of detail coefficients. The decision is obtained using an OR-logic of the two criteria. Also, this study introduces the stability and sensitivity concepts for the fault identification process. In addition, a suggested fault identification sensitivity index is proposed to measure the efficacy of the proposed scheme. Also, different types of mother wavelets are assessed to show that the best mother wavelet, Haar, has high fault detection and classification performance. An ATP/EMTP package is used to simulate the tested part of the 500 kV Egyptian grid. The proposed scheme performance is corroborated under different operating conditions for load changes, fault locations, sampling frequencies of the monitored current, fault resistances, fault types, and inception angles. The proposed scheme is tested for series compensated TFHVTL at different compensation levels.