Dynamic Analysis of Electric Transmission Line Systems with Broken Wires

摘要

A study is reported of the behavior of electric transmission line systems when one or more of the wire suddenly breaks. Special attention focused on the variation with time of the longitudinal unbalanced loads in the system to determine maximum values for design of the support structures. The investigation comprised three parts: (1) broken wire analysis; (2) development of a computer program for dynamic analysis; and (3) design of transmission line systems for broken wires. The computer program performs a dynamic analysis of a general line system after any number of wires are broken. A lumped mathematical model was used and nonlinear equations of motion were solved using two different numerical analysis procedures. The nonlinearity of the system is due to the nonlinear sag-tension relationship for the suspension insulators. A preliminary parametric study shows that dynamic loads and ground line moments which are more than four times the residual static values can be expected in typical line systems.