Early on February 5th, at the 220kV Wuzhi Substation, construction personnel from the Guangyuan Substation Branch of Jiaozuo Power Supply Company used the variable frequency series resonance complete test equipment for the first time to successfully complete the on-site AC withstand voltage test of the current transformer in the 220kV I Chenzhi interval, laying a solid foundation for the early commissioning of the Jiaozuo Power Plant relocation project. To accelerate the development of the city's power grid and the pace of power construction, the branch invested over 600,000 yuan, with a capacity of 2500 kVA and a maximum voltage of 500kV, capable of conducting AC withstand voltage tests on 220kV current transformers, voltage transformers, and GIS equipment. The use of this equipment has effectively enhanced the AC withstand voltage testing capability in the Jiaozuo area and the construction capability of the Guangyuan Substation Branch with first-class qualifications, providing strong technical and equipment support for achieving the branch's goal of expanding beyond Henan and reaching the whole country.