A novel criterion applicable to transformer differential protection based on waveform sinusoidal similarity identification. (February 2019)

• Record Type: Journal Article
• Authors: Weng, Hanli; Wang, Sheng; Lin, Xiangning; Li, Zhenxing; Huang, Jingguang
• Is Part Of: International journal of electrical power & energy systems. Volume 105(2019)
• Page Start: 305
• Page End: 314
• Publication Date: 2019-02
• Subjects: Transformer differential protection -- Sinusoidal similarity -- Hausdorff distance (HD) algorithm -- CT saturation -- Anti-interference performance; Electrical engineering -- Periodicals; Electric power systems -- Periodicals; Électrotechnique -- Périodiques; Réseaux électriques (Énergie) -- Périodiques; Electric power systems; Electrical engineering; Periodicals; 621.3
• DOI: 10.1016/j.ijepes.2018.08.027
• Languages: English
• ISSNs: 0142-0615

Abstract

Highlights: Hausdorff distance algorithm is applied to transformer differential protection. The sinusoidal similarity difference between inrush and fault currents is utilized. The criterion can discriminate magnetizing inrushes from fault conditions. The criterion is applicable for various disturbance conditions with CT saturation. The fast tripping can reach the same speed as that of the pickup criterion. The proposed criterion has superior anti-interference performance. The effectiveness is validated with simulation scenarios and experimental cases. Abstract: The Hausdorff distance (HD) algorithm has superiorities in the recognition of waveform similarity. On this basis, a novel criterion based on the HD algorithm applicable to transformer differential protection is put forward in this paper. The proposed criterion firstly normalizes the differential current sequence and synchronously creates a standard sine wave sequence. Then the HD between the two sequences is calculated to reflect the waveform sinusoidal similarity of the differential current. The proposed criterion can be used to distinguish internal faults, magnetizing inrushes and faults accompanied by CT saturation of the transformer. Simulation and experiment tests are conducted to evaluate the performance of the proposed criterion.