Characteristics of multi-span transmission lines following ice-shedding

Abstract

Numerical simulation method for dynamic responses of multi-span transmission lines with evenly and unevenly distributed ice following ice-shedding from full and partial span in the cases without and with wind loads, is presented and verified by reduced-scale modeling tests. Jump envelop, dynamic swing parameters, maximum reactions on tower and tensions in conductors are defined to depict the dynamic response characteristics of transmission lines following ice-shedding. The characteristics of multi-span lines with various parameters following ice-shedding are numerically studied, meanwhile a dataset is built. Using the dataset and the back-propagation (BP) neural network algorithm, prediction models for the dynamic response characteristics providing instructions for the design of electric insulation clearance and strength of transmission lines in ice zones are established and the software is developed.. The suitability of the prediction model and existing methods are discussed.