Automatic three-layer protection system of distribution network

Abstract

The invention discloses an automatic three-layer protection system of a distribution network. The automatic three-layer protection system of the distribution network comprises a distribution master station, a distribution substation, distribution remote terminals and a communication channel. The distribution master station, the distribution substation and the distribution remote terminals are respectively connected onto the communication channel; the distribution master station is provided with a distribution network control host; distribution network control extensions are arranged in the distribution substation; the distribution network control host and the distribution network control extensions are connected onto the communication channel; the distribution substation is arranged in a transformer substation; each distribution remote terminal comprises distribution terminal equipment and ring main unit terminal equipment; each piece of distribution terminal equipment and each piece of ring main unit terminal equipment are respectively and electrically connected with a corresponding distribution switch; the distribution switches are arranged on a distribution line dropped output to user equipment from transformers of the transformer substation. According to the automatic three-layer protection system of the distribution network disclosed by the invention, the three-layer protection of the distribution network system is realized by the distribution master station, the distribution substation and the distribution remote terminals. The automatic three-layer protection system of the distribution network is high in reliability and high in fault point judgment and isolation speed. The relevance and distribution switch requirement on distribution network system topology is lowered.

Description

technical field [0001] The invention relates to a power system device, in particular to an automatic three-layer protection system for a distribution network. Background technique [0002] The existing distribution network automation system is mainly composed of distribution master station, distribution substation and distribution remote terminal, and the distribution master station, distribution substation and distribution remote terminal are connected through communication channels. Distribution substations are generally installed in substations. The distribution automation system generally includes a distribution automation system. The distribution line is used to connect the transformer in the substation and the connection of each branch user equipment, through the distribution terminal equipment and the ring network cabinet terminal belonging to the remote terminal The device monitors the grid data on the distribution line and controls the opening and closing of the di...

AI Technical Summary

Problems solved by technology

The centralized master station mainly uses the distribution master station to judge the fault area according to the entire topology of the distribution network system and combined with the fault information given by the distribution substation and each distribution remote terminal, and then the distribution master station issues control commands To the power distribution remote terminal, the power distribution remote terminal controls the opening and closing of the corresponding power distribution switch to isolate the fault point, but the localized judgment and isolation of the fault point cannot be realized

In order to avoid misoperation, sometimes it is necessary for the staff to check and confirm the fault point before operating. The fault handling is slow and the efficiency is low. Moreover, if the power distribution master station fails to be repaired, the power distribution system is in a state of no monitoring and protection. Faults such as short circuits can cause damage to grid equipment

The voltage-type feeder automation method can realize local fault point judgment and isolation, but the distribution master station cannot realize the operation management of the entire distribution network system, and at the same time, it needs to overlap the distribution switches many times, which has a great impact on the distribution network system , the power outage time is long, and it may cause the expansion of the fault range, and the requirements for the distribution switch are high, and the manufacturing cost of the distribution switch is also high

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