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ISSN Approved Journal No: 2455-2631 | Impact factor: 8.15 | ESTD Year: 2016
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Authors Name: Harshitha P , K R MOHAN , Joysun Dsouza , Nandini K K
Unique Id: IJSDR1606036
Published In: Volume 1 Issue 6, June-2016
Abstract: Power system protection is one of the key feature of operation and control of power system in supplying the quality power. Transformer plays an important role in the supply of AC power. Protection of such transformer is the need and the basic protection system used for the transformer protection is differential protection. Differential protection based on the comparison of the transformer primary and secondary currents is one of the most important means of protecting a power transformer. When these currents deviate from a predefined relationship, an internal fault is assumed and the transformer is de-energized. The transformer can carry very high primary current and no secondary current during transient primary magnetizing inrush conditions. Use of second harmonic restraint is the most common technique used for preventing false tripping during the above condition. If the second harmonic content of the differential current exceeds a pre-defined percentage of the fundamental, inrush is indicated and the relay is prevented from tripping. Similarly the scenario with the third harmonics present in the supply system. 3rd harmonic blocking filters needs to be used for the treatment of high neutral currents caused by non-linear loads. In this paper a transformer static/electronic differential relay is implemented using second order active band-pass filter for detecting second harmonic ratio. Thus enabling a relay blocking signal during transformer inrush current, also the relay allows for a fine adjustment of the differential characteristic curve to facilitate its use in variety of transformer ratings.
Keywords: differential protection , hall effect transducer, harmonic blocking
Cite Article: "DESIGN AND IMPLEMENTATION OF TRANSFORMER STATIC DIFFERENTIAL RELAY WITH HARMONIC BLOCKING FOR POWER SYSTEM PROTECTION", International Journal of Science & Engineering Development Research (www.ijsdr.org), ISSN:2455-2631, Vol.1, Issue 6, page no.179 - 185, June-2016, Available :http://www.ijsdr.org/papers/IJSDR1606036.pdf
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Publication Details: Published Paper ID: IJSDR1606036
Registration ID:160518
Published In: Volume 1 Issue 6, June-2016
DOI (Digital Object Identifier):
Page No: 179 - 185
Publisher: IJSDR | www.ijsdr.org
ISSN Number: 2455-2631

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