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Development of a Directional Definite-Time Overcurrent and Earth Fault Protection based on COTS Components
KTH, School of Electrical Engineering (EES), Industrial Information and Control Systems.
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Utveckling och testning av överströms- och jordfelsskydd med icke-specifik mjuk och hårdvara (Swedish)
Abstract [en]

Manufactures of power system products face an increased pressure to reduce the time tomarket of their development process without compromising quality. Moreover the operationof power systems needs to be performed in a secure and reliable manner. One ofthe key systems to guarantee those stringent requirements is the protection system. Theobjective of this Master’s thesis is the development of a protection system, which solidlyrelies on Commerciall-o↵-the-Shelf (COTS) components as well as on the developed protectionfunctions. Thereby it is shown that the tight cost requirements can be fulfilledwithout jeopardising the reliability and security performance.This project comprises the development of a definite-time directional overcurrent andearth fault protection. The applied development process is based on a model-based-designapproach, which comprises the definition of the requirements, the design phase, the implementationon the target system and the test phase. As part of this thesis each stageis described and executed. Moreover MATLAB/Simulink was used as development environment,since it perfectly supports the model-based-design approach. The consideredfunctional requirements are mostly based on the standard IEC 60255-151. The developedprotection algorithm runs on a realtime linux system and the interface to the process isbased on the EtherCAT protocol and their corresponding I/O modules. Lastly, the testphase is based on a functional performance test, a type test according to IEC 60255-151,a longterm test and an evaluation of the EMC performance of the used I/O modules.The results of the type tests showed that a IEC 60255-151 compliant solution is yield.Moreover the functional performance test proofed that the developed protection functionoperate as intended for various fault scenarios. Lastly, the realtime performance of protectionsystem has to be further analysed and adapted in order to achieve satisfactorybehaviour.i

Abstract [sv]

Tillverkare av elkraftskomponenter st°ar inf¨or ¨okade utmaningar f¨or att minska tiden f¨orproduktutveckling utan att kompromissa med kvalit´en.Utmaningen blir st¨orre n¨ar ett s¨akert och tillf¨orlitligt elkraftsystem m°aste uppfyllas. Ettav de viktigaste systemen f¨or att garantera dessa krav ¨ar skyddssystemet. Syftet meddetta examensarbete kommer f¨oljaktligen bli att utveckla ett skyddssystem som f¨orlitarsig p°a Commerciall-o↵-the-Shelf (COTS) komponenter och som dessutom tar h¨ansyn tillskyddssystems funktioner. Fr°an detta skyddssystem kan det p°avisas att det ¨ar m¨ojligt attunder ett begr¨ansat tidsspann uppfylla marknadens krav utan att ¨aventyra tillf¨orlitlighetenoch s¨akerheten.Detta projekt innefattar utvecklingen av ett riktat ¨overstr¨omsskydd och ett jordfelsskydd.Utvecklingsprocess bygger p°aen modellbaserad design, som omfattar faserna prestandakrav,konstruktionsfas, implementering och prestandatest av systemet. Som en del av detta arbetekommer varje steg beskrivas utf¨orligt och genomf¨oras. MATLAB/Simulink anv¨andessom utvecklingsverktyg, eftersom den har st¨od f¨or modellbaserad design. De prestandakravsom anses ¨ar f¨or det mesta baserad p°a IEC 60255-151 standarden. Den utvecklade skyddsalgoritmenimplementerat i ett Linux system i realtid, gr¨anssnittet f¨or processen ¨arbaserad p°a EtherCAT protokollet och deras korresponderade I/O moduler. Testfasen ˜A¤rindelat i fyra olika tester kallade prestandatest, typtest enligt IEC 60255-151, realtidstestoch utv¨ardering av EMC prestandan av de anv¨anda I/O modulerna.Resultatet av prestandatest visar att en IEC 60255-151 kompatibel l¨osningen g°ar attuppn°a. Dessutom visar prestandatestet att de utvecklade skyddsfunktionerna fungeradesom planerat f¨or olika fel scenarion. Realtidsprestanda av skyddssystemet beh¨overemellertid ytterligare analyseras och anpassas f¨or att uppn°atillfredsst¨allande resultat.

Place, publisher, year, edition, pages
2015. , 117 p.
Series
EES Examensarbete / Master Thesis, TRITA-EE 2015:101
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-176855OAI: oai:DiVA.org:kth-176855DiVA: diva2:868398
Examiners
Available from: 2015-11-10 Created: 2015-11-10 Last updated: 2015-11-10Bibliographically approved

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