Based on the current signal to judge the feedback protection control method of distribution network automation terminal

Abstract

The invention discloses a method for determining feedback protection control of a distribution network automatic terminal on the basis of current signals. According to the method, currents are taken as a major criterion, and switch position signals and voltage measurement values are taken as auxiliary criteria. The method comprises the following steps: step one, selecting communication high-voltage line areas between a plurality of devices, and taking a circuit breaker of a high-voltage line between any two devices as a section switch; and step two, when a fault occurs in the high-voltage line of any one area and fault currents flow, after low voltages occur at a fault-free side, the isolating the faults, and ending power supply restoration. The feeder protection system can rapidly process the fault and does not need multiple superposition; the fault is rapidly cut off, and electric energy quality of a motor type load is improved; the fault is directly isolated in a fault section, and a non-fault section is not affected; and functions are completed through a feeder protection apparatus, and cooperation between a distribution main station and a substation is unnecessary.

Description

technical field [0001] The invention belongs to the technical field of power system distribution network automation, in particular to a method for judging distribution network automation terminal feedback protection control based on current signals. Background technique [0002] The power system consists of three parts: generation, transmission and distribution. The protection of the power generation link focuses on component protection, and its main purpose is to ensure that the loss of equipment is minimized when an electrical fault occurs in the power plant. The protection of the transmission network focuses on the protection of the transmission line, and its primary purpose is to maintain the stability of the power grid. The protection of the power distribution link is concentrated on the feeder protection. There is no stability problem in the distribution network. It is generally believed that the removal of the feeder fault is not strictly required to be fast. Differ...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a feedback protection control method for judging distribution network automation terminals based on current signals. Through the feeder system protection, the selectivity of protection is realized through communication, and the fault identification, fault isolation, reclosing, and fault recovery are completed at one time, which solves the problem of existing problems

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