File(s) under permanent embargo
A practical look at harmonics in power transformer differential protection
conference contribution
posted on 2023-05-23, 07:28 authored by Madzikanda, E, Michael NegnevitskyMichael NegnevitskyDifferential protection of transformers traditionally uses second and/or fifth harmonics to block its operation during inrush conditions. The second and/or fifth harmonics produced during fault condition, when a protection system is required to operate, have in some cases blocked or delayed operation of transformer differential protection. The problem is to distinguish fault and inrush situations and allow the protection system to operate when there is fault, and to block it during inrush conditions. In order to achieve this, we propose to measure the rate of change of the third harmonic as an additional indicator of the fault condition. If the rate of change of the third harmonic exceeds some predefined threshold and the second and/or fifth harmonic are detected, the protection system will be allowed to operate, and otherwise it is blocked.
History
Publication title
Proceedings of the IEEE PES International Conference on Power Systems Technology (POWERCON 2012)Editors
N NairPagination
1-6ISBN
978-1-4673-2868-5Department/School
School of EngineeringPublisher
Institute of Electrical and Electronics EngineersPlace of publication
Auckland, New ZealandEvent title
IEEE PES International Conference on Power Systems Technology (POWERCON 2012)Event Venue
Auckland, New ZealandDate of Event (Start Date)
2012-10-30Date of Event (End Date)
2012-11-02Rights statement
Copyright 2012 IEEERepository Status
- Restricted