When conducting the DC ice melting operation of ground wires in live transmission lines, induced voltages on insulated ground wires may damage the ice melting equipment, and it is necessary to analyze the induced voltage and take corresponding protection measures to ensure the equipment safety. In this paper, the simulation model of a ± 800 kV UHVDC transmission system is established with the application of the PSCAD/EMTDC software. The induced voltages on the insulated ground wires with various operation modes are simulated, the influence factors and the protection measures are also analyzed. The simulation results show that the induced voltage can be significantly reduced by the single-point grounding of ground wires during the steady-state operation of UHVDC transmission lines. The grounding faults transient can induce high amplitude voltages on ground wires, and parallel gaps of ground wire insulators can limit the voltage amplitude. For the ice melting equipment protection, the insulation level of the equipment should be coordinated with that of the parallel gaps.