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In the paper a new method of high resistance fault detection meant for current differential protections of two-terminal transmission lines is presented. The method is based upon calculation of line differential admittance in pre-fault and in faulty conditions. As the ground fault current during high resistance faults is comparable and, sometimes for long transmission lines, even lower than the line...
Unit protection schemes for auto-transformers can be either based on autotransformer ampere-turn balance or based on first Kirchhoff low between galvanically interconnected parts. The most commonly used auto-transformer unit protection schemes will be described in this document. Advantages and disadvantages of the schemes will be discussed. Finally captured disturbance recordings in existing auto-transformer...
Series capacitor compensation has been predominantly used to enhance bulk power transfer and stability margin between large interconnected regions by partially compensating the inductive impedance of the transmission line. Nevertheless, the installation of this advanced technology could undermine the effectiveness of some conventional line protection. This paper highlights several challenges of protecting...
Developments in substation secondary systems in the future will include more and more the process bus as means to exchange data between sensor and actuators, and control and protection devices, known as Intelligent Electronic Devices (IEDs). Secondary systems will use data coming from different sensors, such as conventional current transformers (CTs) and voltage transformers (VTs) directly attached...
In this paper enhanced differential current protection scheme dedicated for HV transmission lines is described. The adaptive fuzzy relay scheme is proposed that combines strengths of both current and phase comparison protection criteria. The relay stabilization characteristic is adapted on-line depending on the output of the fuzzy reasoning scheme supplied with information from the phase comparison...
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