ABB DSCA121 57520001-U/3电路板
如果要测量的系统是三角形连接，则值为3线直接和3线三角形（2个VT）。3线直接值应用于600 V或以下且直接连接到PQM的系统。对于外部VT，必须选择3线Δ（2个VT）。PQM在任意两个电压端子（V1、V2、V3和Vn）之间接受0至600 V AC的输入电压。这些输入可以直接连接或通过外部VT提供。输入电压大于600 V AC（线对线）时需要外部VT。当使用输入V1、V2和V3测量线对线量时，确保电压公共输入Vn接地。该输入用作测量电压输入的参考。PQM电压输入的所有连接应使用额定为2安培的HRC保险丝连接，以确保足够的中断能力。
If the system to be measured is a Delta connection, the values are 3 WIRE DIRECT and 3 WIRE DELTA (2 VTs). The 3 WIRE DIRECT value should be used for systems that are 600 V or less and directly connected to the PQM. With external VTs, 3 WIRE DELTA (2 VTs) must be selected. The PQM accepts input voltages from 0 to 600 V AC between any two of the voltage terminals (V1, V2, V3, and Vn). These inputs can be directly connected or supplied via external VTs. External VTs are required for input voltages greater than 600 V AC (lineto-line). When measuring line-to-line quantities using inputs V1, V2 and V3, ensure that the voltage common input Vn is grounded. This input is used as a reference for measuring the voltage inputs. All connections to the PQM voltage inputs should be connected using HRC fuses rated at 2 amps to ensure adequate interrupting capacity.
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