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 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。
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