Intelligent outdoor switch box and closed-loop I-shaped power distribution network thereof

Abstract

The invention discloses an intelligent outdoor switch box and a closed-loop I-shaped power distribution network thereof. The intelligent outdoor switch box comprises an incoming wire PT and DTU interval, more than one circuit breaker interval and a bus PT interval; the PT and DTU interval comprises a centralized DTU and an incoming line voltage transformer which are electrically connected with each other; each circuit breaker interval is provided with a current transformer; the bus PT interval is provided with a voltage transformer; the centralized DTU is electrically connected with the current transformer of each circuit breaker interval; and the centralized DTU is electrically connected with the voltage transformer. According to the intelligent outdoor switch box and the closed-loop I-shaped power distribution network thereof of the invention, the centralized DTU is adopted; through an optical fiber differential protection function, a bus differential protection function, a backup protection function, an over-current quick-break protection function, a spare power automatic switching function and the like of the centralized DTU, information interaction between various switch boxesis realized in an optical fiber communication mode; and the quick fault isolation of a power distribution network line and the power restoration of a non-fault area are realized.

Description

technical field [0001] The invention relates to an intelligent outdoor switch box and a closed-loop I-shaped distribution network thereof. Background technique [0002] At present, the domestic distribution network still uses a large number of load switch-fuse combination appliances and load switch products, which are far from meeting the requirements of distributed power supply construction, strong smart grid, and ubiquitous power Internet of Things. The level of automation is higher than that of Japan, Singapore, etc. poor developed countries. [0003] The domestic medium-voltage cable network mainly includes single-ring network type, N-supply-one-backup type, and single-injection type in the main connection mode. When a fault occurs, the power outage range is large, the power outage time is long, and the power supply reliability is low. [0004] At present, domestic distribution network automation mainly adopts local and centralized schemes. The local type does not depe...

AI Technical Summary

Problems solved by technology

The local type does not depend on the control of the master station. Through the cooperation of voltage, current and timing, the isolation of faults and the recovery of power supply in non-faulty areas are realized, and the processing time is long.

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