1997
DOI: 10.1109/61.636909
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Power differential method for discrimination between fault and magnetizing inrush current in transformers

Abstract: To avoid the needless trip by magnetizing inrush current, the second harmonic component is commonly used for blocking differential relay in power transformers. However, the second harmonic component in fault current is increased by the introduction of underground 500kV lines. This paper describes a new method to discriminate internal fault from inrush current by the sum of active power flowing into transformers from each terminal. The average power is almost zero for energizing, but an inlernal fault consumes … Show more

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Cited by 163 publications
(53 citation statements)
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“…The discrimination criterion is based on the following basic principle: the average power is almost zero for energizing, but an internal fault consumes large power. However, the direct application of the average power as a decision signal for the discrimination of inrush/fault conditions can lead to misleading results, due to the oscillations of the average active power, as reported in [7]. The same basic principle mentioned before is particularly suitable for the application of the p-q theory to the power differential method, where the active power component is directly related to the internal fault within the transformer and the reactive power component is associated with the inrush transient.…”
Section: Protection Strategy Based On the P-q Power Theorymentioning
confidence: 99%
See 3 more Smart Citations
“…The discrimination criterion is based on the following basic principle: the average power is almost zero for energizing, but an internal fault consumes large power. However, the direct application of the average power as a decision signal for the discrimination of inrush/fault conditions can lead to misleading results, due to the oscillations of the average active power, as reported in [7]. The same basic principle mentioned before is particularly suitable for the application of the p-q theory to the power differential method, where the active power component is directly related to the internal fault within the transformer and the reactive power component is associated with the inrush transient.…”
Section: Protection Strategy Based On the P-q Power Theorymentioning
confidence: 99%
“…The differential power is computed as the difference between the instantaneous powers at all the transformer's terminals. In [7], the average of the instantaneous differential power is responsible for both the operation and the blocking signals of the relay. The discrimination criterion is based on the following basic principle: the average power is almost zero for energizing, but an internal fault consumes large power.…”
Section: Protection Strategy Based On the P-q Power Theorymentioning
confidence: 99%
See 2 more Smart Citations
“…Not surprisingly, a significant amount of research work has been devoted over the last decades to solve the inrush/fault discrimination dilemma of the transformer differential protection. Several solutions have been proposed in this context, including the refinement of the traditional harmonic restrain methods [14][15][16][17], the development and exploration of new trip and restrain signals [10,[12][13][18][19][20][21][22][23][24][25][26][27][28][29][30][31], the use of wave-shape recognition methods [32][33][34], and the application of advanced digital signal processing tools [11,[35][36][37], fuzzy logic and artificial intelligence techniques [31,[38][39][40]. These methods can provide an alternative or improvement to the existing protective relaying functions.…”
Section: Introductionmentioning
confidence: 99%