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
The right shape for every requirement
The modularly designed CI in its stainless-steel housing can be deployed in diverse situations and installed in various different cabinets and housings. We offer the CI 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 2 systems for 3 e-coils in one cabinet
Current injection incl. automatic power reduction and phase selection
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 CI monitors influences on the zero-sequence voltage and reduces them as needed automatically.
In addition, the current injection automatically selects from two different feed phases and is thus able, even where phase angle relationships are unfavourable, to increase the zero-sequence voltage when necessary.
Can be deployed for 20 kV networks to 1000 A Ice
The 2-frequency CI current injection can be used in 20 kV networks with average damping at up to 1000 A (capacitive earth current). The CI can also be used in networks with lower or higher nominal voltages, whereby the maximum capacitive earth current will change in indirect proportion.
Parametrisation control and connection viaREG-DP(A)
By connecting the CI unit to the REG-DP(A) regulator, the CI 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.