Feeder branch fault detection method and system

Abstract

The invention discloses a feeder line branch fault detection method and system. The method comprises the following steps of: obtaining the currents IB1 and IB2 of a main transformer low-voltage powersupply at a time point t1 and t1 + delta t when a 10kV bus grounding alarm signal is received; judging whether the IB2 meets an opening judgment condition compared with the IB1 or not, and if yes, judging whether a 10kV feeder line main switch and a 10kV capacitor switch are opened or not within the power supply range of the main transformer low-voltage power supply within the time interval deltat; and when opening does not occur, executing a fault judgment step, and when obtaining that the current IZ1 of the 10kV feeder line at t1 and the current IZ2 of the 10kV feeder line at t1 + delta t,which are displayed by the 10kV feeder line main switch, satisfy fault conditions, judging that the 10kV feeder line has a permanent fault and the load is cut off. According to the invention, the feeder line branch permanent fault clearing branch without alarm signal uploading can be discovered in time, so that corresponding processing can be carried out in time and accurately to reduce the powerfailure time of users, the complaint of users is reduced, and the customer satisfaction is improved.

Description

technical field [0001] The invention relates to the technical field of power fault detection, in particular to a detection method and system for feeder branch faults. Background technique [0002] The monitoring personnel of the power system control center need to monitor the power grid signals 24 hours a day, so that when equipment abnormalities are found, the team members can be notified in time to inspect and deal with them, so as to avoid serious consequences. Such as figure 1 As shown, the connection mode of the power grid to the distribution network users is as follows: the power grid is connected to the 10kV feeder main switch 104 through the 10kV bus 103 through the low-voltage switch 102 of the main transformer 101, and the 10kV feeder branch switch 105 branch, the transformer box 106, 380V feeder 107 is used to connect users and supply power to users. Among them, the main branch of the main switch of the 10kV feeder, the 10kV bus of the upper level, and the signa...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a feeder branch fault detection method and system, which solves the problem that it is difficult to distinguish between transient faults and permanent faults in the prior art, resulting in permanent faults that cannot be dealt with in time and affecting the life and production of users and issues that affect customer satisfaction

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