英语翻译想问下open-Δ open-Y改怎么翻译啊比如：The low-voltage connections are three-phase four-wire 120/240-V open-Δ.The high-voltage connections are either open-Δ or open-Y.

英语翻译
想问下open-Δ open-Y改怎么翻译啊
比如：The low-voltage connections are three-phase four-wire 120/240-V open-Δ.The high-voltage connections are either open-Δ or open-Y.