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The character of the voltage at the end of the opened phase conductor was studied and an improved voltage criterion was proposed to distinguish between transient and permanent faults. The performance of the improved criterion is hardly influenced by the load currents of healthy phases, transmission line length, fault distance and fault earth resistance. For EHV/UHV lines with shunt reactors, the improved...
The analysis in theory shows that the protection based on the energy ratio of a high frequency component to a low one can be applied on the EHV lines equipped with shunt reactors and its performance is hardly influenced by the number and locations of reactors. The protection has satisfactory performance to metallic short circuit faults, so it's immune to the different fault earth resistances. If a...
A criterion is proposed to distinguish between temporary and permanent faults of shunt compensated EHV/UHV transmission lines. Its compensation criterion is established. In order to improve its sensitivity when resonant frequency is high. The performance of the criterion and its compensation criterion is hardly influenced by fault distance, fault earth resistance and the currents of healthy phases...
Based on the characteristics of TCSC, the influence of TCSC on fault component distance protection is analyzed. With the new setting resistance to be ZZd-jXC, the action of fault component distance protection on the line equipped with TCSC is presented. It is concluded that the fault component distance protection will not act incorrectly, but the range of protection will be reduced, especially when...
The reflection and refraction of fault-generated wave is discussed. The equations of currents measured by relay in S domain are deduced applying the Peterson principle. The energy ratio of a high frequency component to a low frequency component is mainly influenced by the fault position. Protection based on the ratio will be more adaptive if a higher frequency component is selected to be the low frequency...
This paper presents a novel single-ended transient positional protection (SCTPP) scheme developed using the combined scheme with multi-filter units of mathematical morphology (MFUMM) and multi-resolution morphological gradient (MMG). Multi-filter units can effectively and gradually suppress a variety of random and pulsed noises existing in fault-generated transient signals which can be detected by...
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