Homonymic phase inter-line fault phase selection method of four-parallel line on same tower based on twelve-sequence component

Abstract

The invention discloses a homonymic phase inter-line fault phase selection method of a four-parallel line on the same tower based on a twelve-sequence component, belonging to the technical field of urgent protective circuit devices. The method comprises: a signal is acquired by a phase selecting element, the acquired signal is calculated, and fault recognition is carried out according to the calculated result. The method is characterized by comprising the following steps: acquiring the twelve-phase current amount of a four-parallel line at the part on which a relay protection device is arranged to serve as the original current amount required by the phase selecting element; then matrixing the twelve-phase current amount array phasor quantity of the four-parallel line to obtain a twelve-sequence current component; and finally, fault recognition is carried out by utilizing the size of each sequence component and the phase relation. The invention has the advantages that the influence of mutual inductance of the four-parallel line on the same tower is overcome, high sensitivity is provided by utilizing the fault characteristics of the four-parallel line on the same tower and the basicconcept of the symmetrical component method and adopting the modern signal processing technology. The homonymic phase inter-line fault phase selection method of the four-parallel line on the same tower based on the twelve-sequence component can be widely used in the relay protective field of the bilateral power four-parallel line on the same tower for a high voltage or super high voltage electrictransmission and transformation network.

Description

technical field [0001] The invention belongs to the field of emergency protection circuit devices, and in particular relates to a phase selection method when a phase-crossing fault of the same name occurs in a four-circuit transmission line on the same pole in a relay protection system / device. Background technique [0002] With the development of my country's power system, the land for power construction is becoming more and more scarce, and the construction cost is getting higher and higher. In this context, the power system began to use four-circuit lines on the same pole as high-voltage transmission lines, and four-circuit lines will be more and more used in the future development process. [0003] The circuit topology of the four-circuit transmission line on the same pole is as follows: figure 1 As shown, it is mainly high-voltage and ultra-high-voltage transmission lines, and the four-circuit line on the same pole has the characteristics of narrow outlet corridors and ...

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Problems solved by technology

However, this paper does not further involve the application of the 12-sequence components proposed in power system fault analysis, but only deduces the 12-sequence components themselves

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