CT saturation correction based on the estimated CT saturation time constant

Rebizant, W.; Wiszniewski, Andrzej; Schiel, L.

doi:10.1049/cp:20080031

Cited by 3 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2) blocking of protection device operation [3,4]; 3) switching from standard protection operation algorithm to a specially designed one for operation under CT saturation conditions [5,6]; 4) switching to another settings group, specially calculated for CT saturation conditions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Current Transformer Saturation Detection Method Based on Artificial Neural Network

Rumiantsev

2023

Izv. vysh. ucheb

View full text Add to dashboard Cite

When current transformer is saturated, mainly due to the presence of an exponentially decaying DC component in the fault current, its secondary current has a distinctive distorted waveform which significantly differs from its primary (true) waveform. It leads to an underestimation of the secondary current value calculated by the relay protection compared to its true value. Thus, in its turn, results in trip time delay or even in a relay protection devices operation failure, since its settings and algorithms are calculated and designed on the assumption that the secondary current waveform is sinusoidal and proportional to the primary. And since, when using classical electromagnetic current transformer, it is impossible to exclude the possibility of its saturation, the detection of such abnormal condition is an urgent technical problem. The article proposes to use an artificial neural network for this purpose, which, together with the traditional method of saturation detection based on adjacent secondary current samples comparison, allows implementing a fast and reliable current transformer saturation detector. The article details the stages of the practical implementation of such an artificial neural network. The MATLAB-Simulink environment was used for assess the proposed saturation detector operation. The experiments that had been performed confirmed that proposed method provides fast and accurate saturation detection within the wide range of the power system and current transformer parameters change.

show abstract

Section: Introductionmentioning

confidence: 99%

“…There are also other methods of CT saturation detection described: based on CT physical parameters assessment [30], using the wavelet transform [31] and using mathematical morphology [32].…”

Section: Introductionmentioning

confidence: 99%