Abstract:In order to prevent a transmission line boundary having a weak high frequency from impairing single-ended transient-based relay protection, this paper proposes using the coordination of the current frequency domain features of the relay on both sides of the transmission line to achieve whole-line quick-action protection. In the case of an internal fault, since the frequency components of the electrical quantities in the frequency domain on both sides of the protected line are related to the distance from the f… Show more
“…Ref. [19] addressed the issue of line external fault removal when the load self-starts on the overcurrent protection of the distribution network, which is a new scheme from an adaptive overcurrent protection scheme based on the amount of current mutation. Ref.…”
The existing current break protection cannot achieve full-line current protection and may lose its protection capability.Therefore, this study proposes a self-adjusted full-line current protection strategy based on a double-layer criterion. The first layer of the criterion adopts the adaptive adjustment threshold as the setting value to realize full-line fault monitoring, which is not affected by the system operation mode and fault type. The second layer is used to locate the fault section of the line and improve the selectivity of the protection strategy. Considering the difficulty in accurately identifying high-resistance ground faults using current protection, an identification method based on compound power is proposed by analyzing the zero-sequence network of the system. Simulation results show that the proposed protection strategy can realize full-length line protection and the effective identification of high-resistance ground faults and is not affected by the system load variation and fault type.
“…Ref. [19] addressed the issue of line external fault removal when the load self-starts on the overcurrent protection of the distribution network, which is a new scheme from an adaptive overcurrent protection scheme based on the amount of current mutation. Ref.…”
The existing current break protection cannot achieve full-line current protection and may lose its protection capability.Therefore, this study proposes a self-adjusted full-line current protection strategy based on a double-layer criterion. The first layer of the criterion adopts the adaptive adjustment threshold as the setting value to realize full-line fault monitoring, which is not affected by the system operation mode and fault type. The second layer is used to locate the fault section of the line and improve the selectivity of the protection strategy. Considering the difficulty in accurately identifying high-resistance ground faults using current protection, an identification method based on compound power is proposed by analyzing the zero-sequence network of the system. Simulation results show that the proposed protection strategy can realize full-length line protection and the effective identification of high-resistance ground faults and is not affected by the system load variation and fault type.
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