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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.

How do I manage to calculate the actual relay trip time for phase overcurrent protection (ANSI 50-51) of self powered protection relay VIP 45?

The overall protection graph for Phase Overcurrent Protection (ANSI 50-51) is presented by multiple segments as follows:

image 1

Calculation of tripping time in terms of settings for each curve/segment can be summarized as detailed in attached file.

Released for: Schneider Electric Egypt and North East Africa

Attachment(s)
VIP 45 trip time calculation.pdf [397.09 KB]
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