0.5S 级电流互感器是关口计量精度基础，光伏双向计量必须双向校准，变比按 1.2~1.5 倍最大电流选。
Class 0.5S current transformer underpinning revenue-meter accuracy; PV bidirectional metering requires CTs calibrated both ways, ratio sized 1.2-1.5x max current.
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