Self-adaptive protection device suitable for distribution line

Abstract

The invention discloses a self-adaptive protection device suitable for a distribution line. The self-adaptive protection device comprises an acquisition module 100, a fault phase selection module 200,a protection module 300 and an output module 400, the acquisition module 100 is used for acquiring power frequency and traveling wave electric quantity of the distribution line in real time; the fault phase selection module 200 is connected with the acquisition module 100 and is used for determining a fault type and starting a protection module 300 according to a fault phase selection result; theprotection module 300 is connected with the acquisition module 100 and the fault phase selection module 200 in parallel, and is used for judging whether a fault is in a protection area or not according to different fault types after being started; and the output module 400 is connected below the protection module 300 and is used for receiving the judgment signal sent by the protection module 300,sending an alarm or tripping instruction and controlling the action of the circuit breaker. The single-phase earth fault selective isolation, two-phase fault rapid selective double-end isolation andthree-phase short-circuit fault rapid isolation are achieved, and a foundation is laid for rapid power supply recovery of a non-fault area.

Description

technical field [0001] The invention relates to the technical field of power system protection control, in particular to an adaptive protection device suitable for power distribution lines. Background technique [0002] The power distribution network is directly oriented to users, and its power supply reliability directly affects the power consumption of users. According to statistics, power outages caused by distribution network faults account for more than 70% of the total power outage time of the power grid. The fault types of distribution lines include single-phase ground faults, two-phase and two-phase ground faults, and three-phase short-circuit faults. my country's power distribution system generally adopts the neutral point non-effective grounding method. After a single-phase ground fault occurs, there is no obvious short-circuit current and it can run for two hours with electricity. Generally, the grounding line selection technology is used for processing. Howeve...

AI Technical Summary

Problems solved by technology

After the single-phase ground fault occurs, it cannot be cut off in time, threatening the safety of personal and property near the grounding point

There is no selectivity in the two-phase and three-phase short-circuit fault actions, and the isolation of the fault section cannot be achieved, resulting in the expansion of the power outage area and bringing difficulties to the restoration of power supply in the non-fault area

At the same time, the centralized single-phase ground fault line selection device installed in the substation and the instantaneous current quick-break or overcurrent protection device installed at the outlet of the distribution line in the substation are independent of each other, resulting in many protection devices in the station and difficult coordination between protections

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