Power system fault pre-alarming method based on traveling wave electric amount measurement

Abstract

The invention relates to a power system fault pre-alarming method based on the traveling wave electric amount measurement, belonging to the field of power system relay protection; the method comprises: collecting the traveling wave electric amount measured on part or all the power equipment in the power system in real time and synchronously monitoring whether perturbation occurs on the power system; recording the occurrence time of the perturbation; and comparing the characteristics of the traveling waves electric amount on all the power equipment and determining the power equipment where theperturbation occurs; comparing whether the power equipment where the last three times perturbations including the current perturbation occur is the same power equipment; if yes, calculating the interval between the first perturbation and the third perturbation of the last three perturbations; the time interval being smaller than or equal to the preset time interval, judging that the power equipment has a fault and outputting the result of the fault pre-alarming. The invention can promptly provide power system fault pre-alarming information, thus reducing the power system faults, improving thepower system supply reliability and ensuring the safe and stable operation of the power systems.

Description

technical field [0001] The invention belongs to the technical field of power system relay protection, and in particular relates to a power system fault early warning method. Background technique [0002] When a fault occurs in the power system, the current of the fault circuit increases sharply, and the thermal effect of the short-circuit current may damage the equipment and affect the normal operation of the load. It may cause the power plants operating in parallel to lose synchronization, disrupt the stable operation of the system, and cause serious consequences such as large-scale power outages. Harm normal social and living order. Therefore, the study of power system fault early warning has important theoretical significance and application value. [0003] However, due to the lack of theory and technical limitations, the current research on power system faults focuses on the protection after faults, and there is no early warning method for power system faults. However,...

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Problems solved by technology

[0003] However, due to the lack of theory and technical limitations, the current power system fault research focuses on the protection after the fault, and there is no early warning method for power system faults

However, most power system failures have a development process. If the development process between normal operation and failure of the power system can be accurately identified, it is possible to realize early warning of power system failures.

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