How China achieves high-altitude deployment of ten-bundled conductors? What is corona loss?

How China achieves high-altitude deployment of ten-bundled conductors? What is corona loss?
1. China achieved its first-ever high-altitude deployment of ten-bundled conductors as part of the Sichuan-Chongqing 1,000 kilovolt ultra-high voltage (UHV) alternative current (AC) project. Bundled conductors are a type of electrical conductor used in UHV transmission lines to increase power transfer capacity, reduce corona loss, improve mechanical strength, and reduce electromagnetic interference.
2. Bundled conductor are those conductors which form from two or more stranded conductors, bundled together to get more current carrying capacity.
Single stranded conductors are used in transmission system usually up to 220 KV. But it is not possible to use single-stranded conductor for the voltage above 220 KV systems. So, China is using here this technology.
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3. corona loss-
4. The project will include four UHV substations in Chongqing and neighboring Sichuan Province. Upon completion, about 35 billion kilowatt-hours (kWh) of clean-energy electricity will be transmitted per year.