Which company produced the UHV equipment for the 800 kV line project from Baihetan to Shanghai?

Shanghai Siyuan High Voltage Switch Co., Ltd., a subsidiary of siyuan electric Company of Shanghai Siyuan Power Capacitor Co., Ltd., and many other subsidiaries participated in the 800 kV DC transmission project from Baihetan to Jiangsu. The UHV equipment for the 800 kV line project from Baihetan to Shanghai is produced by Shanghai Siyuan Power Capacitor Co., Ltd. High-voltage electrical apparatus is the equipment that realizes closing, breaking, protection, control, adjustment and measurement on high-voltage lines.