Traditionally, load shedding relays have been used to prevent overloading of the main fuses. Load shedding relays sense the supply currents and disconnects one or more preselected loads if the total current exceeds the mains fuse rating. Besides the inconvenience of disconnecting loads, load shedding relays require careful planning of the phase balance and selection of loads that can be disconnected. Further more, load shedding relays works poorly when a large degree of plug connected equipment is used as these can appear on different phase conductors from time to time.
These problems can be solved with Adaptive Current Equalization. Similar to the load shedding relay the ACE technology measures the supply currents, but instead of disconnecting loads during situations with overcurrents, energy is instead transferred between the phase conductors and the supply current is limited. ACE utilizes the fact that domestic electrical installations today are dominated by single-phase loads and often has a large degree of asymmetry between the three phase conductors. When an overcurrent occurs in one phase conductor there will still be headroom in the remaining two phase conductors.
ACE does not need any information about what loads exist in the installation, thus it is completely transparent to the existing loads. As a result, installation is very simple since the existing installation won’t need to be modified. The current equalizer is simply installed as a new three-phase device.
The increased headroom provided can either be utilized to reduce the main fuse rating or to increase the load currents without increasing the fuse rating.
In this short video, we see how the ACE functionality equalizing the currents. The EnergyHub system takes power from phase 2 and sends out the power to phase 3, which takes the phase current on phase three below 63A.