Numerical Differential Protection of Power Transformer using Innovative Algorithm 
Pooja Dudhal1, H.B.Chaudhari2, Vipin Mishra3, Bhanwar Lal Bishnoi4
1Pooja Dudhal, Department of Electrical, VJTI, Mumbai (Maharashtra), India.
2Prof. H. B. Chaudhari, Department of Electrical, VJTI, Mumbai (Maharashtra), India.
3Vipin Mishra, Department of EDDC L&T Electrical & Automation, Mumbai (Maharashtra), India.
4Bhanwar Lal Bishnoi, Department of EDDC L&T Electrical & Automation, Mumbai (Maharashtra), India.
Manuscript received on 27 August 2019 | Revised Manuscript received on 03 September 2019 | Manuscript Published on 14 September 2019 | PP: 438-446 | Volume-8 Issue-5S3, July 2019 | Retrieval Number: E10930785S319/19©BEIESP | DOI: 10.35940/ijeat.E1093.0785S319
Open Access | Editorial and Publishing Policies | Cite | Mendeley | Indexing and Abstracting
© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: This paper presents a new innovative algorithm for Numerical Differential Relay design of transformer. Fault information is critical for operating and maintaining power networks. This algorithm provides accurate performance for transformer by which is independent of system conditions such as: External fault, Inrush current, CT saturation. Locating transformer faults quickly and accurately is very important for economy, safety and reliability point of view. Both fault-detection and protection indices are derived by using Numerical Differential Relay algorithm design of transformer. The embedded based differential and operating current measurement device is called numerical differential relay is among the most important development in the field of instantaneous fault operation. Numerical relay provides measurement of differential current and operating current at power transformer above 5MVA in substation. Simulation studies are carried out using MATLAB Software show that the proposed scheme provides a high accuracy and fast relay response in internal fault conditions. Current transformers form an important part of protective systems. Ideal Current Transformers (CTs) are expected to reflect the primary current faithfully on the secondary side. Under conditions the CT saturates, and hence it cannot reproduce the primary current faithfully. This paper deals with simulation methods for determining CT performance under different factor. A Simulink model has been developed to observe CT response under steady state w.r.t Burden, Turns ratio, Asymmetrical current, Hysteresis conditions. Thus, it is now possible to evaluate the CT performance under these factors.
Keywords: DC offset, FFT, Hysteresis, Burden.
Scope of the Article: Algorithm Engineering