Abstract: An analytical method is presented for the dynamic analysis of transmission line systems subjected to a broken conductor. The transmission line system is modeled as a single wire, plane system of cable elements attached to springs or fixed supports. An iterative linear acceleration method is used to compute the movement of the lumped masses following a conductor breakage. A computer program, CABLE7, using the analytical method is provided. The program generates the cable elements from simple input data describing the line conditions, numbers the degrees of freedom, performs the dynamic analysis, and plots the tensions and displacements. The effect of program and numerical variables such as the convergence criteria, time interval and the number of cable elements is discussed in detail. A review of previous experimental studies on broken conductor loads is included. Good correlation between experimental and analytical tension time histories is obtained when the analytical approach is applied to several experimental test cases. The results of a parameter study with over 200 test cases using the analytical simulation are presented. The effect of tower stiffness, initial line tension, span, insulator length, and conductor properties on the peak tensions are discussed with respect to the first peak due to the recoil of the conductor from the break and to the second peak due to the bottoming down of the conductor. The effect of additional line weight due to ice loading is also included. The properties of a bundled-conductor are used for the parameter study to provide data on heavier conductors not previously studied. The results clearly show that the interaction of the parameters is complex and distinct for each peak due to the different mechanisms involved. The data from the parameter study is presented in detail. The tension time history for each test case and numerous plots of impact factor as a function of line properties are included in the Appendix.