Distribution Network Fault Location Method Based on Attribute Checking of Terminals with the Same Name

Abstract

The invention provides a distribution network fault location method based on dotted terminal attribute checking. The method comprises the steps that a switch topology parameter in a distribution network line topology is acquired; connection areas of switches are used as topology nodes; the topological polarity of each topology node is configured according to the Kirchhoff current law; the wiring polarity of the current terminal of each switch is determined according to the wiring way of each switch in a distribution network; dotted terminal attribute checking is carried out on the topology polarity of each topology node and the wiring polarity of the current terminal of the switch connected with the topology node; according to a dotted terminal attribute checking result, the current phase of a switch corresponding to the dotted terminal is inverted or maintained and the current phase of a switch corresponding to the non-dotted terminal is maintained or reversed for each topology node; according to the current phase of each topology node at each connected switch, current flowing in and out directions at the corresponding topology node are determined; and if the directions are consistent, the topology node is a fault point. Without considering a voltage transformer, a distributed power supply and the like, fault isolation is realized through current.

Description

technical field [0001] The invention relates to the technical field of distribution network, in particular to a distribution network fault location method for verifying attributes of terminals with the same name. Background technique [0002] Most of the distribution network is a radial network with a single power supply. When a fault occurs, the fault current will flow from the power point to the fault point along the only way. The traditional fault faults adopted by the centralized FA (feeder automation) and intelligent distributed FA of the distribution network system Isolation methods also use this as a theoretical basis. If the fault current flows through a node and at the same time flows through the child nodes with this node as the parent node, then the node is not a fault node, and if the fault current does not flow through the node as the parent node. If the node is a child node of the parent node, then this node is the fault point, and the fault area can be determi...

AI Technical Summary

Problems solved by technology

When a fault occurs between the system power supply and the distributed power supply, both the system power supply and the distributed power supply will provide short-circuit current, and the flow direction of the fault current is no longer unique. Fault isolation judgment method to judge

[0004] At present, most of the fault isolation methods for multi-power supply systems are to introduce overcurrent directional elements into the protection, and judge the fault point by comparing the voltage and current phase difference on both sides of the line. However, most of the power distribution systems do not install voltage transformers or install Potential transformers are expensive, so fault isolation with overcurrent directional elements is not practical

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