Energy position tandem protection method and device for extra-high voltage transmission line

Abstract

This invention puts forward an energy direction pilot protection method and a device based on Bergeion model and faulty component, in which, the method utilizes symbols of active energy measured at both ends of the circuit and utilizes the model to compensate the voltage of both ends to the circuit middle point to solve the problem that the active energy direction element can not judge the faulty direction correctly since the resistance is very small in the system when the positive direction of the circuit is faulty.

Description

technical field [0001] The invention relates to the field of relay protection for power system transmission lines, in particular to a relay protection method and protection device for UHV transmission lines. Background technique [0002] The direction comparison type longitudinal protection has the advantages of fast action on the whole line, small communication volume, low requirements on communication speed and channel performance, and no strict synchronization of data at both ends. It has always been one of the main protections used on high-voltage transmission lines. At the same time, it It is also one of the key points of relay protection research; the directional element is the core of the directional comparison type longitudinal protection. Therefore, the performance of the directional element largely determines the performance of the entire protection. [0003] Traditional energy direction components have the following problems: [0004] The traditional active ener...

AI Technical Summary

Problems solved by technology

[0004] The traditional active energy directional element is the active energy obtained by multiplying the instantaneous value of the fault component voltage and the fault component current at a certain end of the line and then integrating it. It uses its magnitude and direction to judge whether there are internal or external faults and faults on the line. Its main disadvantage is that due to the small internal resistance of the system, the active energy directional element cannot correctly determine the fault direction when the line is faulty in the positive direction.

When the directional element reflecting apparent energy is used in UHV transmission lines, it cannot correctly judge the direction of the fault due to the influence of distributed capacitance.

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