Abstract There are three weak links in energy saving design of power supply and distribution system: the economic selection of transformers, the economic selection of cable, and power factor correction in harmonic environment.

• 摘要当前供配电节能设计中存在三个薄弱环节：变压器的经济选型、电缆的经济选型以及谐波环境中的功率因数校正问题。