7.1　Access into Grid

7.1.1　In the design of electrical system，the power delivery point，transmission voltage，number of outlet transmission lines，transmission capacity（including penetrating power），operating mode and type of interconnection with the power grid shall be determined depending on the characteristics of the hydropower station and requirements of the electrical power system.

7.1.2　Primary voltage should be adopted for the transmission voltage of the interconnection of the hydropower station and the electrical power system.(https://www.daowen.com)

7.1.3　A united switchyard or a united step-up substation should be installed for cascade hydropower stations or a group of hydropower stations in accordance with the design requirement for connection with the electrical power system.