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This FAQ has been written for NEAL (North East Africa and Levant) region. If you are looking for information for another region, please select the correct country from the top-left dropdown in the page and 'Navigate to Browse FAQs' in the Support menu.
What is the definition of ANSI 81L - Underfrequency?
Detection of abnormally low frequency compared to the rated frequency, to monitor power supply quality.

The protection may be used for overall tripping or load shedding.

Protection stability is ensured in the event of the loss of the main source and
presence of remanent voltage by a restraint in the event of a continuous decrease of
the frequency, which is activated by parameter setting.

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