GE DS3800HAIA1E1D控制模块
如果3线DELTA/2 VT、4线WYE/3 VT和4线WYE/2 VT连接的平均电压低于VT RATIO×VT标称二次电压的10%，或者4线WY/DIRECT和3线DIRECT连接的平均值低于VT RATION×VT标称直接输入电压的10%时，不平衡读数将强制为0%。这样做是为了避免系统负载较轻时发出干扰警报。如果使用模拟电压，则不平衡不会强制为0%。Van、Vbn、Vcn MINIMUM：显示最小相电压幅值及其发生的时间和日期。该信息存储在非易失性存储器中，并在失去控制电源期间保留。S1 PQM设置\清除数据\清除最小/最大电压值设置点清除这些值。
If the average voltage is below 10% of VT RATIO × VT NOMINAL SECONDARY VOLTAGE for 3 WIRE DELTA/2 VTs, 4 WIRE WYE/3 VTs, and 4 WIRE WYE/2 VTs connections, or below 10% of VT RATIO × NOMINAL DIRECT INPUT VOLTAGE for 4 WIRE WYE/DIRECT and 3 WIRE DIRECT connections, the unbalance reading is forced to 0%. This is implemented to avoid nuisance alarms when the system is lightly loaded. If the simulation voltages are being used, the unbalance is never forced to 0%. Van, Vbn, Vcn MINIMUM: Displays the minimum phase voltage magnitudes and the time and date of their occurrence. This information is stored in non-volatile memory and is retained during loss of control power. The S1 PQM SETUP \ CLEAR DATA \ CLEAR MIN/ MAX VOLTAGE VALUES setpoint clears these values.
