It is suggested that the excitation transformer power be introduced as the operational power supply for the regulator, and the rotor overvoltage protection of the unit be modified.

为此，提出了防范此类事故的对策，建议引入励磁变压器电源作为调节器的工作电源，并对该机组的转子过电压保护进行改造。

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A reasonable nonlinear model for transformer switch-in with load was proposed in this paper and multivalued hysteresis characteristic was adopted to be the excitation characteristic of the core.

建立了一个比较合理且精确的变压器有载合闸的非线性数学模型，铁芯的励磁特性采用了多值磁滞特性。

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Based on the BP (back propagation) model for excitation characteristics of transformer, a modified BP model is presented and the corresponding algorithm is also deduced.

在变压器励磁特性的BP模型基础上，提出了一种修正的BP模型，并推导了相应的算法。

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