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

A longitudinal protection and energy technology, applied in the field of relay protection methods and protection devices of UHV transmission lines, can solve the problems of inability to correctly identify the direction of the fault, small resistance, inability to correctly identify the fault direction, etc., and achieve fast action speed. , The effect of improving reliability and high reliability

Inactive Publication Date: 2007-02-14
TIANJIN UNIV
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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 ...

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

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Embodiment Construction

[0032] The basic principle diagram is as follows figure 1 shown. According to the principle of superposition, the state of a line after a fault occurs can be decomposed into a normal system and a fault component system. Based on the fault component system, firstly, the voltage and current of the fault component at the head end of the line are used to obtain the voltage at the middle point of the line using the Beryllon algorithm, and the active energy of the fault component at the head end is obtained by integrating this voltage with the fault component current at the head end; Theoretically, the voltage at the middle point of the line is obtained from the voltage and current of the fault component at the end of the line, and the active energy of the fault component at the end is obtained by integrating this voltage with the current of the fault component at the end.

[0033] When the system is running normally, theoretically there is no fault component, and the energy of the...

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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...

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Application Information

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IPC IPC(8): H02H7/22H02H3/38
Inventor 贺家李周金辉李永丽
Owner TIANJIN UNIV
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