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4.1.1 Basic connection
According to the transformer voltage regulation and winding connection mode, the tap selector has a
variety of different specifications. It is composed of the number of tap selector pitch, the number of
operating positions and the form of the changeover selector. The designation of the tap selector model is
shown in Figure 4-2.
Figure 4-2 Tap selector basic cone
For example:
1). Linear regulation: It is represented by 5 digits. For example, 14140 means that the contact position of
each phase is 14, the number of working positions is 14, and the number of intermediate positions is 0.
2). Reversing regulation: Add a letter W after 5 digits, such as 14131W, which means that the contact
position of each phase is 14, the number of working positions is 13. The number of intermediate
positions is reversing adjustment.
3). Coarse and fine regulation: 5 digits followed by a letter G, such as 14131G, indicating the contact
position of each phase 14, the number of working positions is 13. The number of intermediate positions
is coarse and fine adjustment.
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