Hybrid distributed feed line system for overhead cable line

Abstract

The invention discloses a hybrid distributed feed line system for an overhead cable line, and the system mainly comprises a voltage processing module, a current processing module, a fault analysis module, and a data display module. The voltage processing module and the current processing module are respectively used for processing an AC voltage and an alternating current in a looped network circuit, and outputting a DC voltage and a direct current to the fault analysis module. The fault analysis module will judge which segment has a fault according to the judgment which segment has zero DC voltage and direct current, and judge whether the fault is a grounding fault or a short-circuit fault. The fault analysis module enables an analysis result to a data display module through optical fiber communication for displaying. The system is advantageous in that the system carries out the judgment of the DC voltage generated by induction of an annular overhead line, can judge which segment has the fault more quickly, can judge the type of the fault, is very high in practicality, and saves the fault locating and removing time.

Description

technical field [0001] The invention is designed in the field of distribution network automation, in particular to a hybrid distributed feeder system for cable overhead lines. Background technique [0002] Power transmission safety is an important manifestation of power transmission quality, and the interphase short-circuit fault and single-phase ground fault of power transmission lines such as overhead lines have caused huge pressure on power transmission safety. [0003] In the current era of low-carbon economy, as new energy sources such as solar energy and wind energy are connected to the distribution network, the characteristics of the traditional distribution network's one-way flow are overturned, and the traditional distribution network relay protection is more difficult to determine the fault zone. [0004] The United States plans to complete the intelligent distribution network project IDG (Intelli-D-Grid) within 10 to 20 years. Intelligent distribution network (In...

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Problems solved by technology

[0005] Domestically, the protection of the distribution network mainly removes the fault through the protection action of the feeder outlet of the substation. This operation method has two problems: 1. It expands the scope of power failure and reduces the reliability of power supply; 2. It is necessary to set up substations in the substation , used to coordinate the relationship between multiple feeders, making maintenance relatively complicated

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