Maximum sag modeling method of substation flexible conductor on basis of catenary

Abstract

The invention provides a maximum sag modeling method of a substation flexible conductor on the basis of a catenary. The method includes the steps of firstly, dividing the substation flexible conductor into a strain insulator string and a flexible bus, and determining structure parameters and material parameters; secondly, establishing an X-Y coordinate system with a hanging point of the strain insulator string as an original point, establishing the spatial coordinate equation of the strain insulator string assuming that the hanging point bearing reaction force RA and the horizontal tension T0 are known, and obtaining the horizontal projection length and the perpendicular projection length of the strain insulator string; thirdly, establishing an x-y coordinate system with an end point of the flexible bus as an original point, and obtaining the flexible bus catenary equation on the basis of a catenary theory; fourthly, converting the flexible bus from the x-y coordinate system to the X-Y coordinate system through coordinate conversion, obtaining the substation flexible conductor sag expression through the combination of the spatial coordinate equation of the strain insulator string, and then obtaining the maximum sag value of the flexible conductor. On the basis of the known structure parameters and the known material parameters, the accurate maximum sag value is directly obtained according to any design stress of a substation, the sag control is facilitated, and quite high application value is obtained.

Description

technical field [0001] The invention relates to a sag calculation method of a substation soft conductor, in particular to a catenary-based method for modeling the maximum sag of a substation soft conductor. Background technique [0002] Overhead lines in substations, in a broad sense, generally include soft wires, jumpers, down conductors and connecting wires between other equipment. The function of the soft wire is to collect, distribute and transmit electric energy; the jumper is used to connect the wire between the two spans of the soft wire, and is generally used for the change of the transmission line of the substation; the down conductor is led from the soft bus and connected to the underground The main function of the wire connected to the device is lightning protection. Then, in order to meet the performance requirements of different types of overhead lines in substations, there must be different design specifications. The sag plays an extremely important role in t...

AI Technical Summary

Problems solved by technology

However, the soft conductors in substations belong to short-distance overhead lines. Accessories such as insulators, tension clamps, and fittings have a great influence on the length and force of the flexible conductors in the substation, and obviously occupy a weight that cannot be ignored. Therefore, the calculation method of transmission line sag is not Suitable for flexible wires in substations

Images