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What is ``thermal imaging``?

Thermal Imaging is the same as Thermal Memory. The thermal imaging function protects the cables or bus bars from overheating in case of low amplitude repetitive overcurrents. Such overheating can be due to repetitive motor startings, fluctuating load, intermittent ground faults, or subsequent closing after a fault.
The thermal imaging function remembers and integrates the thermal heating caused by each pickup setting overrun. Before tripping, the integrated heating value will reduce the associated time delay and, therefore, the reaction of the trip unit will be closer to the real heating of the power network system. After tripping, the function will also reduce the time delay when closing the circuit breaker on an overload.

CTA-ID : 7970
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