Power distribution and utilization data association-based medium-voltage power grid line fracture fault diagnosis method

Abstract

The present invention provides a power distribution and utilization data association-based medium-voltage power grid line fracture fault diagnosis method. The method includes the following steps that: step 1, the data information of a power distribution and utilization information system is inputted to a database, a line fracture fault electric quantity hierarchic data system is constructed; step 2, the output data information in the database is processed, and the time-space distribution characteristics of a medium-voltage power distribution line fracture fault can be obtained; step 3, a medium-voltage power distribution line fracture fault model is built, according to the line fracture fault electric quantity hierarchic data system and strong association rules, parameter optimization is carried out, and the association condition of characteristic quantities of a medium-voltage distribution network when a fault occurs can be determined, so that an association rule set is obtained; and step 4, real-time information inputted by the power distribution and utilization information system is matched with the association rule set, the state of the medium-voltage distribution network can be determined. With the method of the invention adopted, a diagnosis association rule set and an auxiliary rule set can be automatically generated by using an improved association rule algorithm according to line fracture fault historical data without grounding fault characteristics, and therefore, useful information can be provided for the decision making of online fault diagnosis.

Description

technical field [0001] The invention relates to a method for diagnosing branch line disconnection and non-ground faults in the field of grid fault diagnosis. Background technique [0002] The power system has spent a lot of manpower and material resources on the horizontal faults of the power system - all kinds of short-circuit faults, using complete relay protection devices to quickly remove and isolate faults, and the longitudinal faults of the power system - disconnection faults It does not generate a large fault current and is less harmful to power transmission and transformation equipment. The degree of attention in power grid operation and maintenance is far less than that of short-circuit faults, but disconnection faults are also one of the common types of faults in power grid operation, directly causing power outages for users, and at the same time , the negative-sequence current generated by long-term lack of phase operation will cause damage to rotating electrical ...

AI Technical Summary

Problems solved by technology

At present, there are better fault detection methods for disconnected ground faults and feeder disconnected faults. The dispatching department can quickly receive grounding signals and disconnected fault signals, and the modern new fault line selection device can quickly make fault line selection accuracy. It can reach more than 95%. However, there has been no good diagnostic method for branch line disconnection and non-grounding faults due to the small current change after the fault occurs. The transportation inspection department has an online power quality monitoring system that can record the two-phase and The three-phase high-voltage fuse tube is blown. This system is a non-real-time system. It cannot respond when the fault occurs. It is often discovered by the power company after the user reports a power outage and repairs.

[0003] In addition, the current advanced application based on the fault repair management system for such faults has a very low diagnostic accuracy and cannot be effectively promoted on a large scale, which has great limitations.

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