Nonlinear fuzzy detection method for operating safety of power cable tunnel

Abstract

The invention discloses a nonlinear fuzzy detection method for operating safety of a power cable tunnel. The method comprises the following steps of: determining a project layer, a subproject layer and an index layer in a model, detecting the index layer and acquiring data; establishing a comment set; establishing a deterioration grade of each evaluation index and a membership function matrix of a corresponding comment set; determining weight of each level of evaluation indexes; sequentially calculating fuzzy evaluation matrixes of the index layer and the subproject layer by using an analytic hierarchy method until a final fuzzy evaluation result vector is obtained; and determining an evaluation result of an operating safety state of the power cable tunnel by using a maximum membership degree method. Single parameter early warning of the operating state of the cable tunnels and cables is realized, comprehensive on-line safety index evaluation and early warning are realized, technical support is provided for timely and effectively processing operating hidden dangers and failures of the cables, and after the project is finished, abnormal power failure can be reduced, and major disasters can be warned in advance; and an inspection workload of a worker is reduced. After the project is finished, the method can be popularized nationwide and has high economic and social benefits.

Description

technical field [0001] The invention relates to a method for evaluating the safety status of power cable operation based on online monitoring information, in particular to a non-linear fuzzy detection method for power cable tunnel operation safety. Background technique [0002] With the implementation of the State Grid Corporation's goal of establishing a "unified strong smart grid", the proportion of power cables in the power system has increased year by year. The increasing size of cable lines has also brought some serious problems. Compared with overhead lines, cable operations face a harsher operating environment and higher operating costs. First of all, the technical capabilities and production levels of cable manufacturers are uneven, as well as objective factors such as rising raw material prices and fierce market competition, resulting in unstable quality of cables and their accessories. Secondly, the operating environment of power cables, including cable trenches a...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the maintenance of power cables still adopts the traditional methods of manual inspection and power outage maintenance, which cannot timely and comprehensively understand the operation status and reliability of power cables.

The cable tunnel automatic monitoring system is mainly aimed at parameters such as cable joint temperature and partial discharge current, and can collect and monitor some operating data in real time. However, it lacks effective evaluation algorithms and early warning basis, and cannot comprehensively evaluate the safety status of power cable operation in a timely manner.

Images