SACE TMAX XT UL/CSA LOW VOLTAGE MOLDED CASE C I RCUI T- BRE AKERS UL4 89 AND CSA CS2 2 . 2 STANDARDS
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— Load Shedding
Benefits Thanks to Tmax XT with the embedded Load Shedding innovations, the following benefits are guaranteed: Service continuity When a plant remains disconnected from the main grid, even if local generation is present, there is a significant stress that may imply that the genera- tors fail with a consequent blackout. Load Shedding logic embedded in the Tmax XT re- duces the frequency drop that usually makes the local generation protection trip, maintaining a live plant. Space saving • No other programmable logic controllers (PLCs) are needed as the Tmax XT has embedded intelli- gence for the load shedding logics, taking advan- tage of the current and voltage sensors for elec- trical parameter measurements. • In addition, static converters for low voltage photo- voltaic production typically have anti-islanding pro- tection: this implies another power deficit to be added to the main grid contribution during the mi- crogrid islanding. The Tmax XT estimates solar pro- duction without additional sensors.
• The Load Shedding algorithm is suitable with ATS architectures to distinguish priority and non-pri- ority loads. Where feasible, a BusTie switching device is no longer required and this means: - Significant space and material savings of up to 50% in the power distribution switchgear for panel builders. - The Load Shedding algorithm is self-tuned with specific power unbalance identification and dy- namically chooses the controllable loads to be shed, reducing constraints for consultants during plant design. - The ATS unit only manages two sources, with- out interlock, logic programming or wiring con- nections for the third circuit-breaker with less time required for installation. Ease of use Load shedding logic is generally set using top engi- neering skills and customization efforts with de- vices as programmable logic controllers. The Tmax XT guarantees easy installation thanks to predefined templates and the user-friendly graphic interface in the software commissioning tool.
— Typical Load Shedding application
Gen Set
PV Plant
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LINE 1
OFFICES
LINE 2
WAREHOUSE
POWER FACTOR CORRECTION
M
M
M
3
3
3
ASYNCHRONOUS MOTOR LIGHTING
SOCKET
LIGHTING HVAC
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