ABB DSDI451 57160075A脉冲编码器
NEUTRAL CT PRIMARY（空档CT初级）：仅当NEUTRAL CURRENT SENSING（空档电流感应）设定值设置为SEPARATE CT（分离CT）时，此信息才可见。输入CT初级电流。例如，如果为空档感应安装了50:5 CT，则输入50。一安培CT也可用于中性感应。•VT接线：在此设置点中输入系统的VT连接。三种可能的选择是星形、三角形和单相。如果要测量的系统是Y形连接，则选择4线Y形直接、4线Y型（3个VT）和4线Y Y型（2个VT）。4线WYE DIRECT值用于600 V或以下且直接连接到PQM的系统。VT标称次级电压设定值由标称直接输入电压代替。对于外部VT（取决于使用的外部VT数量），必须选择4线Y形（3个VT）或4线Y型（2个VT）。注意，当使用4线WYE（2 VT）值时，仅测量两个电压；在假设Van+Vbn+Vcn＝0的情况下计算第三电压。此假设仅适用于平衡系统电压
NEUTRAL CT PRIMARY: This message is visible only if the NEUTRAL CURRENT SENSING setpoint is set to SEPARATE CT. Enter the CT primary current. For example, if a 50:5 CT is installed for neutral sensing enter 50. One amp CTs can also be used for neutral sensing. • VT WIRING: Enter the VT connection of the system in this setpoint. The three possible selections are Wye, Delta and Single Phase. If the system to be measured is a Wye connection, the selections are 4 WIRE WYE DIRECT, 4 WIRE WYE (3 VTs), and 4 WIRE WYE (2 VTs). The 4 WIRE WYE DIRECT value is used for systems that are 600 V or less and directly connected to the PQM. The VT NOMINAL SECONDARY VOLTAGE setpoint is replaced by NOMINAL DIRECT INPUT VOLTAGE. With external VTs (depending upon how many external VTs are used) 4 WIRE WYE (3 VTs) or 4 WIRE WYE (2 VTs) must be selected. Note that when using the 4 WIRE WYE (2 VTs) value, only two voltages are measured; the third voltage is calculated on the assumption that Van + Vbn + Vcn = 0. This assumption is valid only for balanced system voltages
转载请附上此链接：http://www.jiangxidcs.com/
