What is it about?
3-phase-4-wire (3P4W) electric power supply system is common in buildings. Elevator systems are normally supplied by a 3P3W instead. In Hong Kong, a total power factor (TPF) of at least 0.85 is mandatory. Owing to the existence of unbalanced 3 phase currents, it is impossible to correctly estimate the TPF of an elevator system. This paper proposes the world's first definition for such an unbalanced 3P3W system, particularly for elevator systems or other similar systems. s
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Why is it important?
The correct measurement of TPF for any elevator system is mandatory by law in Hong Kong but so far there had not been a correct definition for it because the electric load is 3P3W and unbalanced. This paper solved the decade long problem.
Perspectives
This paper has resulted in an appropriate change in the mandatory Building Energy Code of Hong Kong since the 2018 edition.
Albert So
Read the Original
This page is a summary of: On the total power factor of lift systems, Building Services Engineering Research and Technology, January 2017, SAGE Publications,
DOI: 10.1177/0143624417690192.
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