The ENVILINE ARU ensures track receptivity during regenerative braking. It dissipates all surplus energy that cannot be absorbed by other onboard loads / nearby trains, nor recovered by the ENVILINE ERS or ESS.
The ENVILINE ARU senses the rising line voltage caused by regenerated / surplus energy and connects an appropriate resistive load to maintain the voltage within safe operating limits, avoiding the need to use (and wear out) the mechanical brakes.
The ARU can operate in coordination with wayside energy storage and/or energy recuperation systems and ensure that any dissipation into resistors occurs only as a last resort.
The controller cabinet can be mounted directly in the DC switchgear lineup or separately with other equipment such as negative disconnects and automatic grounding switches. Additionally, the resistor bank is placed outside the substation, where the heat can be dissipated economically.