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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
14.1 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 13.1 Design the HPCI
Each HPCI control cabinet consists three components.2 Connecting the current injection
The time and effort needed wire the new HPCI pretty much the same for classic cur-
rent injection. 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.2. mm2)
14.
0 Control unit
Figure 146: Control unit (HPCI module)
.1.
14
