Abstract: The flue gas desulphurization equipment without bypass of thermal power plant operates simultaneously with the main power generation unit, and the desulphurization electrical system is identical in importance with the electrical system in the main power house. The conventional desulphurization electrical system for FGD system with bypass is difficult to satisfy the requirement in reliability and continuity of the power supply. The design of electrical system for FGD system without bypass was expounded in detail, and the design features of the desulphurization electrical systems for the system with bypass and the system without bypass were compared, which provides reference for the persons of the same profession.

Key words: thermal power plant, bypass, flue gas desulphurization (FGD), electrical system