GE DS3800NVCD1B1B CPU板卡
O/V操作所需相位：选择所选输出继电器运行前必须检测过电压条件的最小相位数。如果VT接线设置为单相直接，则该设置点不可见。•电流不平衡继电器：电流不平衡计算为平均值的最大偏差除以平均三相电流。电流不平衡可以禁用，用作报警或过程控制。如果不需要此功能，则将此设置点设置为关闭。如果存在电流不平衡情况，选择报警继电器将使报警继电器激活并显示报警信息。选择辅助继电器将导致辅助继电器在电流不平衡条件下激活，但不会显示任何信息。这用于过程控制。
PHASES REQ’D FOR O/V OPERATION: Select the minimum number of phases on which the overvoltage condition must be detected before the selected output relay will operate. This setpoint is not visible if VT WIRING is set to SINGLE PHASE DIRECT. • CURRENT UNBALANCE RELAY: Current unbalance is calculated as the maximum deviation from the average divided by the average three phase current. Current unbalance can either be disabled, used as an alarm or as a process control. Set this setpoint to off if the feature is not required. Selecting alarm relay will cause the alarm relay to activate and display an alarm message whenever a current unbalance condition exists. Selecting auxiliary relay will cause the auxiliary relay to activate for a current unbalance condition but no message will be displayed. This is intended for process control.
