每个传感器都有两个喇叭继电器和两个群继电器，并且每个警报主频都可以驱动任何一个通用继电器。
Each Annunciator can have up to two Horn relays and two Group relays and each alarm channel can be configured to drive any of these common relays.
提出了一种通用的动作边界可自定义的继电器模型。
Construct a universal relay model that the action boundary can be self-defined.
最后根据轻微故障的特点提出对变压器比率差动继电器通用特性选择的建议，供同仁参考。
According to the calculation result and features of low percentage interturn fault, the general characteristic selection for percentage differential relay of transformer is suggested.
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