正常源每一相位的欠压传感：起始电压可在额定值85 - 100%的范围内调节；回动电压可在始动值75 - 98%的范围内调节。
Undervoltage Sensing for Each Phase of Normal Source: pickup voltage is adjustable form 85 to 100 percent of nominal, and dropout voltage is adjustable from 75 to 98 percent of pickup value.
变压器的额定值是以这样的假定为依据的，即正常运行时绝缘仅发生极缓慢的老化。
Transformer ratings are based on the Assumption that4 only an extremely slow deterioration of insulation will take place with normal operation.
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