Three phase power reinventedADAPTIVE CURRENT EQUALIZATION

Ferroamps patented Adaptive Current Equalization technology (ACE) allows for a more efficient use of a three-phase supply. EnergyHub ACE transfers energy between the phase conductors to increase the headroom between the main fuse rating and the loads. This headroom can either be used to reduce the mains fuse rating or to increase the load, for example, more efficient and faster EV charging.
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ACE BENEFITS

The ACE technology dynamically transfers energy between the phase conductors of a three-phase installation, thereby limiting supply phase currents to the mains fuse rating without limiting the load currents. The supply phase currents are measured using current transformers and a device based on the Current Equalizing Technology will absorb energy from phase conductors that have currents below the mains fuse rating and inject energy into phase conductors that have currents exceeding the fuse rating.

Mains fuse overloading avoided
Protects the main mains fuse from being overloaded
Single phase currents
Single phase load currents can exceed the current rating of the three-phase supply
Reduced distribution losses
Enables a more efficent use
Simple installation
Easily installed as a new three-phase device
Transparent to existing loads
No need to modify the existing installation
Prevents overcurrents
Prevents overcurrents from all loads in the installation

APPLICATION EXAMPLE: PROTECTING THE MAIN FUSES

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.

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Measures

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Equalizing

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Enables the lowest possible main fuse

ACE – Adaptive Current Equalization
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APPLICATION EXAMPLE: ELECTRIC VEHICLE CHARGING

Electric vehicle (EV) charging will present a rather new type of load behavior to domestic electrical installations in that a large single phase load is supplied continuously for several hours.

This new type of load in combination with the existing loads is likely to overload a mains fuse in many installations. Thus, larger mains fuses or even larger supply cables can be required, if at all possible, to enable fast charging. This problem can, however, be elegantly solved for electrical installations with a three-phase supply.

In addition to ensuring that the mains fuses are not overloaded, the Current Equalizing Technology will even allow single phase loads to be supplied with a current exceeding the rating of the three-phase supply. For example, an electric vehicle charging applications, a single phase EV charger could be supplied with 32 A current in an electrical installation with a 3 x 20 A three phase supply.

Stops overloading
No single phase gets overloaded when charging vehicles
Allows higher currents
Single-phase charges can be provided with a current that exceeds the value of the three-phase supply
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Electricity. Reinvented.

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