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新建２２０ ｋ Ｖ 输变电工程，要研究工程的必要性、经济合理性和开工时机。当拟建２２０ ｋ Ｖ 变电所供电范围内的负荷，依靠范围之外变电所以１１０ ｋ Ｖ 线路正常输送电力严重超过经济输送容量，事故输送电力超过导线的热稳定极限，供电距离长，网损大，暂态稳定水平和电压质量不能满足要求时，新建２２０ ｋ Ｖ 变电所是必要的；当该工程投产年（ 或投产的第２ 年） 的售电量和销售电量控制加价能补偿还本付息和合理收益时，则为经济合理的；当负荷增长，建设新线路，减少损耗，节约年运行费，大于该年支付利息时，则该年建成２２０ ｋ Ｖ 线路是最经济时机
To build a new 220 kV power transmission and transformation project, we must study the necessity of the project, economic rationality, and timing of construction. When the load within the power supply range of the proposed 220 kV substation is changed, the normal transmission power on the 110 kV line will seriously exceed the economical transmission capacity due to the out-of-range substation. The accident transmission power exceeds the thermal stability limit of the wire, and the power supply distance is long. When the loss is large, the transient stability level and the voltage quality cannot meet the requirements, a new 220 kV substation is necessary; when the project is put into operation (or the second year after it is put into production), the amount of electricity sold and the sales volume control increase can be compensated. In the event of interest payments and reasonable gains, it is economically reasonable; when the load increases, new lines are built, losses are reduced, annual operating expenses are saved, and interest payments are greater than during the year, the establishment of 220 kV lines in that year is the most economic opportunity.