With the construction of ultra-high-voltage（UHV） projects

anti-galloping measures are facing more rigorous challenges for transmission lines that are impacted seriously by icing and wind load. So a new anti-galloping measure based on the inter-phase spacer applied in the UHV test transmission line of Jianshan Test Site in Henan Province has been analyzed and simulated by using the three-degree-freedom（3DOF） nonlinear simulation model established by Tsinghua University

and the results have been compared with conditions with no spacer to verify its effect. Furthermore

its effect to restrain galloping has been verified by comparing with condition installing the inter-phase spacer and the synchronous galloping condition. Finally

11 configurations have been simulated and the recommended one has been given. The results show that: when installing the phase-to-earth spacer

the crest of the trajectory of the installation point is reduced and the amplitude of galloping is 70% of the amplitude when installing the inter-phase spacer. Therefore

the phase-to-earth spacer has stronger effect compared with the inter-phase spacer. When it is installed along with the inter-phase spacer

the synchronous galloping can be restrained effectively and asynchronous galloping can be restrained better. With both installations the amplitude of synchronous galloping is 50% of the amplitude when installing the inter-phase spacer alone

and the amplitude of asynchronous galloping is reduced by 19% of the amplitude when installing the inter-phase spacer alone. Of all 11 configurations

it is recommended most when the phase-to-earth spacers are installed to the points which are one-quarter

a half and seven-ninth of the span for transmission lines that may get galloping in the 1st and 2nd orders. The phase-to-earth spacer is a useful and effective solution to restrain galloping.