A Review on Power Swing Blocking Schemes of Distance Relay During Stable Power Swings
Cholleti Sriram1, Y. Kusumalatha2
1Cholleti Sriram, PhD Research Scholar, Department of EEE, Koneru Lakshmaiah Education Foundation, Guntur (A.P), India.
2Y. Kusumalatha, Professor, Department of EEE, Rise Krishna Sai Prakasam Group of Institutions, Ongole (A.P), India
Manuscript received on 18 April 2019 | Revised Manuscript received on 25 April 2019 | Manuscript published on 30 April 2019 | PP: 636-642 | Volume-8 Issue-4, April 2019 | Retrieval Number: D6622048419/19©BEIESP
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© 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: Distance relays operate very fast compare to over current relays against faults to protect the transmission lines. Besides faults, distance relays can also operate due to power swings, it would be treated as relay maloperation. This maltripping of distance relays may lead to severe blackouts. So, primary requirement is to differentiate the short circuit fault and the stable power swing and need to block the mho type distance relay operation when the power swing is stable and unblock the distance relay operation when the power swing is unstable. This review paper discusses about different Power Swing Blocking (PSB) proposed schemes used for detecting and blocking the operation of relay when the power swing is stable and to avoid maltripping of the relays and severe blackouts. Comparison is made among different PSB schemes.
Keywords: Distance Relay, PSB Schemes Using ANFIS, FZC, PCF and dQ/Dt Methods
Scope of the Article: Low-Power Design