An electrothermal current prediction method for overload protection of miniaturecircuit breakers

Authors

SEN LYU
MING ZONG

DOI

10.3906/elk-1911-74

Abstract

Traditional miniature circuit breakers (MCBs) cannot meet the requirement for the intelligence of distributing apparatuses in a smart grid. The intellectualization of MCBs is restricted due to the lack of appropriate current measurement methods. Thus, an electrothermal current prediction method is proposed based on the derived relationship between root-mean-square (RMS) current and steady-state temperature rise. A fast acquisition algorithm is used to obtain the required temperature rise before thermal equilibrium to highly reduce the total time consumption. The presented prediction method is found immunized against the ambient temperature. The theory is validated with experiments using a thermostat. The tested steady-state accuracy and transient performance could meet the overload protection requirements without being affected by the environmental temperature.

Keywords

Miniature circuit breaker, electrothermal current calculation, fast temperature acquisition, overload protection

First Page

2523

Last Page

2537

Recommended Citation

LYU, SEN and ZONG, MING (2020) "An electrothermal current prediction method for overload protection of miniaturecircuit breakers," Turkish Journal of Electrical Engineering and Computer Sciences: Vol. 28: No. 5, Article 11. https://doi.org/10.3906/elk-1911-74
Available at: https://journals.tubitak.gov.tr/elektrik/vol28/iss5/11