5P10,后面的10就是准确限值系数。 5P10表示当一次电流是额定一次电流的10倍时,该绕组的复合误差≤±5%。准确限值系数的意义就是在保证误差在±5%范围内时,一次电流不能超过额定电流的倍数,如果此时一次电流比较大,就要选用5P20的,甚至还可能选用5P30的。
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