Figure 120: Multi-Stage Overfluxing Characteristic; Figure 121: Scheme Logic For Multi-Stage Overfluxing Characteristic - GE P642 Technical Manual

Chapter 12 - Frequency Protection Functions
You can use PSL to combine the stages to create a multi-stage V/Hz trip operating characteristic, as shown below:
Note:
Consult the manufacturers' withstand characteristics before formulating these settings.
V00865

Figure 120: Multi-stage overfluxing characteristic

V/Hz>2 = 1.4 p.u.
t = 1 s
V/Hz>3 = 1.2 p.u.
t = 4 s
V/Hz>4 = 1.1 p.u.
t = 0 s
E00866

Figure 121: Scheme logic for multi-stage overfluxing characteristic

258
V/Hz(%)
V/Hz>2 Trip
V/Hz>3 Trip
V/Hz>3 Start
V/Hz>1 Inhibit
1
V/Hz>4 Start
V/Hz>1 = 1.06
TMS = 0.08 V/Hz>1 Trip
V/Hz>1
V/Hz>4
V/Hz>3
V/Hz>2
Multi-
Characteristic
1
R14 V/Hz Trip
P64x-TM-EN-1.3
P64x