Method for analyzing OPGW (optical fiber composite overhead ground wire) system grounded short-circuit current on basis of extended phase-component method

Abstract

The invention discloses a method for analyzing OPGW (optical fiber composite overhead ground wire) system grounded short-circuit current on the basis of an extended phase-component method. A phase wire and an OPGW are taken as a whole, the interaction of the phase wire and the OPGW is considered, and the phase wire and the OPGW are analyzed with a consistent analysis model. By means of the method, the electrical quantities, distributed along wires, of short-circuit current and the like on the OPGW and the phase wire of a power transmission system can be accurately obtained when single-phase ground short circuit happens. The method is applicable to two different situations of a power transmission system of a single-ended power supply and a power transmission system of a double-ended power supply; the mode for operating two OPGWs simultaneously in the power transmission system is also contained; a complicated operation mode that whether the two OPGW wires are sectionally insulated and whether pole towers are grounded step by step is further contained; the distribution rule, calculated with a new algorithm, of the short-circuit current on the OPGWs is further contained. The method adopts a mature technology and is high in reliability.

Description

technical field [0001] This application belongs to the field of power transmission systems, and specifically relates to a new method for analyzing the grounding short-circuit current of an OPGW system based on the extended phase component method, which is applicable to complex power transmission systems with dual OPGW lines of 110-500kV double-sided power supply or single-side power supply. The operation mode of the OPGW line is closer to the actual operation of the modern power transmission system, including whether the OPGW line is insulated in sections and whether the OPGW line is grounded step by step. This application can accurately analyze the short-circuit current value on the phase line and the distribution state of the short-circuit current on the OPGW line when the ground short circuit occurs on the transmission line, which has good application value and is of great significance to the short circuit current distribution after the ground short circuit occurs in the tra...

AI Technical Summary

Problems solved by technology

Therefore, in the face of the complex operation mode of lines and overhead ground wires, the phase component method is more and more widely used in the calculation of short-circuit current on overhead ground wires. The traditional phase component method does not include the short-circuit current on the phase line and the short-circuit current on the OPGW line Simultaneous calculation of short-circuit current increases the calculation process and cannot form a unified calculation system

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