Letter to the Editor: Inclusion of Sensitive Equipment Immunity in the Overcurrent Protection of Transmission and Sub-transmission Systems

Authors: Gómez, J. C.¹; Morcos, M. M.²

Source: Electric Power Components and Systems, Volume 35, Number 2, February 2007 , pp. 239-243(5)

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Abstract:

Nearly 80% of customer complaints about power quality (PQ) are related to voltage sags. Voltage sags due to short-circuit faults are detected and their effect is detrimental hundreds of miles away from the fault location. Overcurrent protection must be done taking PQ issues into account. By transforming the voltage/time immunity curve into a current/time curve it can be coordinated with the normal time/current characteristic (TCC) of protective devices. Having the SE immunity curve, the TCC of protective devices, and the fault occurrence index, a complete evaluation of the whole power-quality and overcurrent-protection interaction can be assessed.

Keywords: power quality; voltage sags; overcurrent protection; sensitive equipment immunity

Document Type: Research article

DOI: http://dx.doi.org/10.1080/15325000600890962

Affiliations: 1: Rio Cuarto National University, Cordoba, Argentina 2: Kansas State University, Manhattan, Kansas, USA

Publication date: 2007-02-01

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