GE IS220PTURH1B工控控制模块
下图显示了将CT连接到3线系统PQM的两种方法。上图显示了使用三个CT的标准接线配置。备用接线配置仅使用两个CT。使用双CT方法，通过将A相和C相的公共线连接到PQM上的B相输入端来测量第三相。这会导致A相和C相电流以相反方向流过PQM的B相CT，产生与实际B相电流相等的电流。对于上述CT连接，必须将S2系统设置\电流/电压配置\相位CT接线\相位CT主设定点设置为A、B、C相，提供给PQM的控制电源必须与安装的电源匹配。如果施加的电压不匹配，可能会损坏装置。检查产品标识，以验证控制电压是否符合预期应用。
The figure below shows two methods for connecting CTs to the PQM for a 3-wire system. The top drawing shows the standard wiring configuration using three CTs. An alternate wiring configuration uses only two CTs. With the two CT method, the third phase is measured by connecting the commons from phase A and C to the phase B input on the PQM. This causes the phase A and phase C current to flow through the PQM’s phase B CT in the opposite direction, producing a current equal to the actual phase B current.For the CT connections above, the S2 SYSTEM SETUP \ CURRENT/ VOLTAGE CONFIGURATION \ PHASE CT WIRING \ PHASE CT PRIMARY setpoint must be set to PHASE A, B, AND C.The control power supplied to the PQM must match the installed power supply. If the applied voltage does not match, damage to the unit may occur. Check the product identification to verify the control voltage matches the intended application.
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