Overcurrent selectivity between circuit breakers in a hospital using DOCWIN software of ASEA Brown Boveri, Inc. (ABB), Sucat, Parañaque,Philippines

Date

4-2014

Degree

Bachelor of Science in Electrical Engineering

Major Course

Major in Power Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Athena P. Lavega

Abstract

In an electrical system, the continuity of service is most important to institutions where works done within it are vital to the lives of the people. Examples are in the hospital?s emergency rooms and intensive care units. Therefore selectivity, a type of coordination specifically used in two circuit breakers in series, is applied to a health care facility. The idea of having selectivity is to make the load-side protection device to trip first than the supply-side device whenever overcurrent occurs at some point. There is total selectivity when the downstream breaker always trip first than that in the upstream. Otherwise, if both breakers trip simultaneously at a specific value of current, it is said to have partial selectivity. Current, time, energy, and zone selectivity are the different selectivity techniques done with different combination of circuit breakers in the low voltage division. Using DOCWin software, selectivity analysis was done in an electrical system of a hospital. Since the system is a hospital, the critical loads in the system were considered thus the selectivity analysis was to make sure that aside from the whole system not being out of service, the hospital?s critical loads also must have a continuous service. Different cases were also presented in the study and from these cases, it was concluded that having either a totally or partially selective load side breakers does not necessarily mean that the system will be in service continuously. Moreover, emergency systems are also considered for the hospital?s critical loads. The generator that serves as back-up power supply has breakers installed in it that acts as a switch that closes the circuit if there is a presence of fault in the load. Thus, the generator?s breaker is analyzed if it will bring a total selectivity whenever fault occurs within these loads so that in this way, the continuity of service will be guaranteed even though the load breakers open as response to the fault occurrence. Also, it is concluded that only the individual specification between two circuit breakers in series determines a well-coordinated system, thus recommendations were made.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993 2014 E64 A43

Document Type

Thesis

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