输变电工程物理效益识别和量化是项目规划设计的经济评价和后评价工程效益分析的重要内容。针对各类输电工程的特点及其在电网中的地位和作用，分别进行了相关的物理效益识别。结合输变电工程具有的网络性特点，采用电力系统平衡分析等方法，以工程项目所在电网为研究对象，对不同工程的主要物理效益的量化计算方法进行了探讨。

Physical efficiency identification and quantization of power transmission and transformation project is of importance to the benefit analysis of economic evaluation and post evaluation. According to the features, position and role of the project in the power grid, the corresponding physical efficiency is identified. Combined with the networking power transmission and transformation project and based on the power grid, the quantization calculation methods for the physical efficiency are discussed, by using the balance analysis method for the power system.