工具：EplanP8版本
步骤：
1、打开EplanP8，新建一个名为“新项目”的项目，然后选择菜单“工具”-“主数据”-“符号库”-“新建”；
2、新建一个名为“NEW_symbol”的符号库；
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3、在符号库属性画面将基本符号库选为“NEW_symbol”；
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4、选择菜单“工具”-“主数据”-“符号”-“新建”；
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5、目标变量选择“变量A”，然后点击“确定”；
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6、在符号属性画面，命名符号名，选择功能定义，连接点；以创建一个变压器元件库为例，符号名定为“TC1”，功能定义选择“变压器有PE，可变”，连接点为“11”，点击“确定”。
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