自藕变压器的伏安容量大大小于变压器输出功率，减小了变压器的体积和价格。
The required VA ratings of auto-couple transformers is much less than its output power, thus the size and price of the transformer is reduced a lot.
照明路灯通过自藕变压器进行调零切换实现有级降压，可以得到不同的节电效果。
Using of change on neutral point for auto-transformer to achieve tap change by step, lighting lamps can have different effects of power-saving.
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