Distance measurement method for distance protection based on petal-type power grid

Abstract

The invention belongs to the technical field of the distance protection for the power grid, and particularly relates to a distance measurement method for a distance protection based on a petal-type power grid. According to the distance measurement method, the method avoids an excessive resistance, has a high ability to withstand the load current, and can accurately acquire the fault distance, thereby completing the fault point positioning quickly. The distance measurement method is convenient to realize; can provide accurate results of the distance measurement for a fault detection and positioning; improves the efficiency of a grid fault detection and elimination; and further improves the stability and safety of the petal-shaped power grid.

Description

technical field [0001] The invention belongs to the technical field of power grid distance protection, in particular to a distance measuring method based on petal-type power grid distance protection. Background technique [0002] "Petal-type" wiring means that in the distribution network, a closed-loop network is connected by two substations, and there is also a connection between the closed-loop networks to form a petal-type network. The "petals" are connected to each other, and they can support each other in the event of a failure, and the power supply can be restored quickly. "Petal" has two power supplies in normal operation mode. Once any device or line in "Petal" fails, the faulty section will be automatically isolated within "zero seconds", and the non-faulty section will continue to supply power normally. If the substation bus or transformer fails, it can also be powered by the adjacent petals through the tie line, so that the fault area and power outage time can be...

AI Technical Summary

Problems solved by technology

[0003] In the ranging process of traditional distance protection, the distance between the fault point and the protection point is usually calculated according to the impedance to achieve ranging. Since the impedance will be affected by excessive resistance in the actual process, it will cause a large Although the error can be reduced through hardware and information processing, it will also bring huge cost investment and introduce new uncertain factors. For the petal-shaped power grid, in order to ensure its stability and safety In order to quickly locate and measure faults and reduce fault recovery time after a fault occurs, a more efficient fault distance measurement scheme should be adopted

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