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.
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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