The nine-zone graph theory is widely recognized in reactive power optimization but hard to deal with three-coil transformers.
九域图原理是电压无功控制的成熟理论，但在处理三绕组变压器时有一定的难度。
The Distribution Automation system of YinChuan involves 104 out-door switches, 10 switch stations, 14 section trans- formers and single transformers of the whole old city zone.
银川配电自动化项目涉及整个老城区的104台户外开关，10座开闭所，14台小区变与台变。
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