Assessment of saturated current transformer primary current by multi resolution analysis of its secondary current

Chattopadhyay, Surajit; Chattopadhyay, S.; Bera, Jitendranath; Sengupta, Samarjit

doi:10.1109/ciec.2016.7513763

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2017

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“…In [3], an algorithm that uses a third-order differential method to distinguish a saturation point has been proposed, but the results of this algorithm cannot detect CT saturation when a fault phase angle of more than 180 ° occurs. In [4][5][6][7][8][9], the algorithms detect the saturation instants using the discrete wavelet transformation. However, there is no reason why to adopt such mother wavelets, sampling frequencies, and the output levels of the multi-level filter banks in each paper, respectively.…”

Section: Introductionmentioning

confidence: 99%

A CT Saturation Detection Algorithm Based on the Analysis of the Saturated Current Using Wavelet Transformation

Kim¹,

Kang²

2017

Modelling, Simulation and Identification / 854: Intelligent Systems and Control

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In this paper, distorted current relaying signals due to the CT saturation are analyzed with WT (Wavelet Transformation). Daubechies 2 is used as the mother wavelet. The output level (detail) of multi-level filter banks and the sampling frequency are also analyzed. The first output level of the multi-level filter banks for the output level (detail) and the 3,840Hz of the sampling frequency are adopted. A series of test results show that the proposed algorithm detects the saturated region accurately under various faults and CT conditions of a C800 CT model.

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