Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
73 (1993), S. 6869-6871
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
A new algorithm has been developed for a single phase relay. This can be used for the protection of both single phase and three phase transformers. This paper presents a new scheme using the real time integration technique to determine the differential current caused by either magnetizing inrush current or an internal fault. The proposed relay has been simulated for continuous monitoring of the behavior of the differential current wave form, through the peak value of each current cycle and digital integration of that cycle. The trip of the relay depends on any changes in the area under the differential current wave form. The magnetizing inrush current waveform has less area under its curve than the fault current wave form which contains a sinusoidal wave and a transient dc component. This phenomenon has been used to block the operation of the relay on "not true'' fault current seen as differential current.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.352466
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