Through the case of application of energy optimization control system in the 220 kV transformer of Hangzhou Steel, the principle and system solution of the energy opti-mization control system are introduced. The significant economic and social benefit brought by the energy optimization control system to steelmaking enterprises has been proven by related tests.%通过能源优化控制系统在杭钢220 kV钢铁变应用的实例，介绍了能源优化控制系统的原理、系统方案等。并通过相关测试，证明了能源优化控制系统在冶金企业产生的巨大的经济效益和社会效益。
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