The differences are follows:
0 Separate connection for the supply voltage for the electronics and the power supply to
the power unit (fuse and Q2)
0 Power supply the two-phase power unit (L1, L2, for automatic switching
0 Connection the power auxiliary winding with bigger cross-section because it’s need-
ed for pulsing (min. mm2)
14.2 Connecting the current injection
The time and effort needed wire the new HPCI pretty much the same for classic cur-
rent injection.2.
14.1.1 Design the HPCI
Each HPCI control cabinet consists three components.1 Regulating the P-coil with HPCI The basics current injec-
tion
The basics current injection with HPCI are the same for classic current injection, which
is described Chapter 13.
0 Control unit
Figure 146: Control unit (HPCI module)
.Page 219
Commissioning the HPCI
0 Fast calculation; takes place within filter cycle (240 ms)
0 Works very symmetrical grids
0 Calculation results immune unbalance and crosstalk from the positive
sequence system the zero sequence system
0 Cyclical current injection for the constant monitoring changes the grid
0 Creates pulse signal when earth fault occurs help locate the earth fault
0 Recognizes the generated pulse signal the detection relays EOR-D, EOR-3D and EOR-
1D
14
