Figure 98: Modification Of Current Pickup Level For Voltage Controlled Overcurrent Protection - GE P642 Technical Manual

P64x
Current pickup setting
K x Current pickup setting
E00642

Figure 98: Modification of current pickup level for voltage controlled overcurrent protection

In the P643 and P6455, VCO requires an optional three-phase VT to be fitted, and in the P642 it requires that two
single-phase VTs are fitted. In P643/5, the phase-to-phase voltages are derived from the measured phase-to-
neutral voltages. In the P642, two phase-to-phase voltages are measured and the third one is calculated. In the
P642 Vab and Vbc are measured, then Vca is calculated.
P64x-TM-EN-1.3
Current
setting
Voltage threshold setting
Chapter 9 - Current Protection Functions
Measured voltage
211