Current Injection for Low or Highly Variable Zero Sequence Voltages
The classic regulation process, i.e. searching for the resonance curve across the range of travel of the coil, can no longer successfully adjust the arc suppression coil in certain network situations. We have developed this current injection for the increasingly frequent cases where the zero-sequence voltage is highly disturbed or subject to extreme influences or where networks are highly symmetrical. The current injection creates a signal that is fed into the network via the auxiliary power winding of the arc suppression coil. From the network reaction, the combined REG-DP(A) and current injection are able to calculate a resonance curve despite the low or highly variable zero-sequence voltage.
Instruction Manual REG-DP(A)
The right component shape for every application
The modularly designed CIF can be deployed in diverse situations and installed in various different cabinets and housings. We offer the CIF in the following shapes:
• On an assembly plate for 19″ cabinet installation
• In a standard cabinet for interior installation
• In a standard cabinet for exterior installation
• In a standard cabinet for exterior installation (mast-mounted)
• In a standard cabinet for exterior installation (wall-mounted
•Up to 3 systems for 3 e-coils in one cabinet
Standard version for 20 kV networks to 1000 A Ice
Special version for 110 kV networks with higher power
The 2-frequency CIF current injection can be used in 20 kV networks with average damping at up to 1000 A (capacitive earth current). The CIF can also be used in networks with lower or higher nominal voltages, whereby the maximum capacitive earth current will change in indirect proportion.
The CIF is also available as a more powerful variant with a higher feed current, specially designed for 110 kV networks with a large capacitive earth current.
Current injection with manual power reduction
For very small networks, the current injection can lead to undesirably strong influences on the zero-sequence voltage, meaning in the worst-case scenario that the earth fault threshold may be crossed. To prevent this, the power of the current injection can be reduced as needed.
IO wiring with CIF possible
To simplify the cabling between the REG-DP(A), the CIF and suppression coil, the I/O signals (peak/trough commands, limit switch, potentiometer) can be wired directly to the MCI.
Parametrisation control and connection via REG-DP(A)
By connecting the CIF unit to the REG-DP(A) regulator, the CIF can be parameterised, calibrated and controlled. Connection via all standard communications protocols is also possible. The REG-DP(A) regulator can be connected via REG-P, REG-PE or REG-PED SV control units. The following protocols are available (further protocols on request):
- IEC 60870 -5 -101 / 103 / 104
- IEC 61850
- DNP 3.0 RTU / DNP 3.0 TCP
- MODBUS RTU / MODBUS TCP
The perfect supplement to arc suppression devices: freely adjustable project planning and parameterisation software
The AEToolbox works on a project basis and impresses with its range of functions and the versatility that the program offers.