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Treider, Thomas; Høidalen, Hans Kristian
IET generation, transmission & distribution, December 2023, 2023-12-00, 2023-12-01, Letnik: 17, Številka: 24Journal Article
Earth faults is a challenging fault type to locate in resonant grounded networks due to their naturally low fault current, and the problem increases with an increased fault impedance. This paper describes the detailed implementation and laboratory testing of a method for detection, location and clearing of earth faults with very small fault currents. The method consists of two indicators used in the fault detection stage, where their simultaneous operation ensures selective fault detection and faulty feeder selection. One of these indicators also enables continuous fault indication throughout a sectionalizing process. The laboratory tests demonstrate that both indicators function as intended, and it is the current sensors which ultimately limit the attainable sensitivity. Faults up to 15 kΩ were detected successfully in the laboratory network based on phase current measurements, while the sectionalizing indicator showed much higher sensitivity and functioned as intended in a 50 kΩ fault. Measurements from one field test in a 22 kV network corroborate the laboratory results and demonstrate the expected earth fault indicator response. This paper presents a method for detecting, locating and clearing low‐current earth faults in resonant grounded networks. The implementation of the fault detection logic is described in detail, and the method is verified experimentally using a physical 400 V laboratory network equivalent.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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