Unigear Digital; Figure 1: Unigear Digital And Its Key Components - ABB UniGear Series Engineering Manual

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UniGear Digital

UniGear Digital is a new solution implemented to the traditional UniGear switchgear. It is
accomplished by using state-of-the-art, well-proven components: current and voltage
sensors, Relion
The design of the current sensors is very compact and it is optimized for the use in UniGear.
Each panel can accommodate two sets of current sensors. The voltage sensors are very
compact as well. They are integrated as part of support insulators housed in the cable
compartment or directly in the busbar compartment.
The current and voltage sensors are very accurate (accuracy class 0.5), however revenue
metering might require higher accuracy classes or separate instrument current and voltage
transformer. Such transformers can optionally be added to sensor-equipped panels.
Capacitive voltage detection is enabled by capacitive dividers that are either integrated into
the support insulators or into the conventional current transformers, which is used case by
case.
Fast horizontal GOOSE communication for inter-panel (bay-to-bay) signals exchange is
a mandatory part of this solution, while the Process bus is optional.

Figure 1: UniGear Digital and its key components

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® protection relays and IEC 61850 digital communication.
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