Analiza utjecaja međunapajanja i otpora na mjestu kvara na djelovanje distantne zaštite

scientific master's theses

• Author: Kristijan Frlan; VIAF: 305655560
• Mentor: Ante Marušić (mentor)
• Committee member: Ivica Pavić (predsjednik povjerenstva)
• Committee member: Ante Marušić (član povjerenstva)
• Committee member: Matislav Majstrović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Energy and Power Systems); Zagreb
• Defense date and country: 2006-12-20, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering; Power Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

Otpor na mjestu kvara i medunapajanje u elektroenergetskom sustavu imaju velik utjecaj na tocnost mjerenja udaljenosti do mjesta kvara te djelovanje distantnih zaštita. Distantni zaštitni uredaj dobiva informacije o analognim mjerenjima samo s jedne strane šticenog voda te na osnovu njih odreduje uvjete za proradu. Vanjski utjecaji, medunapajanje, otpor na mjestu kvara kao i doprinos struji s druge strane šticenog voda, uzrokuju netocnosti u mjerenju i odredivanju impedancije kvara što može dovesti do pogreške u proradi distantnog releja. Analiza utjecaja medunapajanja i otpora na mjestu kvara na djelovanje distantnih releja provedena je pomocu programa DIgSILENT PowerFactory, a testirana je na dijelu elektroenergetskog sustava HEP-OPS, Prijenosnog podrucja Rijeka. Simuliranjem poznatih stvarnih vrsta kvarova, s razlicitim vrijednostima otpora na mjestu kvara, analizirano je djelovanje distantnih releja. Promjenom uvjeta na mjestu kvara provjereno je u kojoj se mjeri mjenjaju analogne velicine koje mjeri distantni relej. Obradom dobivenih rezultata razmotren je utjecaj spomenutih promjena na odredivanje uvjeta za proradu i djelovanje distantne zaštite na iskljucenje visokonaponskog voda. Iz analize proizlazi da su distantni releji podložni utjecaju otpora na mjestu kvara i medunapajanja, te su opisani neki od nacina uporabe numerickih releja i sustava modernih komunikacija u svrhu poboljšanja sustava relejne zaštite.

Abstract (english)

Fault resistance and intermediate in-feed in the power supply system have got substantial influence on the accurate measurement of distance to the fault location, as well as functioning of distance relay protection. Distance protection device obtains information about measurements only from one side of the protected line, and determines conditions for functioning based on them. External influences, intermediate in-feed, fault resistance, as well as additional current from the opposite end, cause inaccuracies in measurement and fault impedance determination, which can result in a distance relay failure. Analysis of influence of intermediate in-feed and fault resistance at the fault location on the functioning of distance relays has been made by using the program DIgSILENT PowerFactory, and it has been tested in one part of the electric power supply system of the Transmission Area Rijeka. Functioning of distance relays has been analysed by simulating familiar and real types of faults, with different resistance values at a fault location. The degree of change of analogous values measured by the distance relay has been investigated by changing the conditions at the fault location. The influence of the above-mentioned changes on the determination of fault conditions and distance protection operation on the tripping of a high-voltage line has been taken into consideration. It follows from the analysis that distance relays are subject to the influence of fault resistance and intermediate in-feed. Some usages of numerical relays and modern communication systems for the improvement of relay protection system have been described.

• Keywords: distantna zaštita; impedancija kvara; otpor na mjestu kvara; medunapajanje; utjecaj opterecenja; greška mjerenja; numericki releji; konfiguracija releja; komunikacija
• Keywords (english): distance protection; fault impedance; fault resistance; intermediate in-feed; influence of load transfer; measurement failure; numerical relays; relay configuration; communication
• Language: croatian
• URN:NBN: urn:nbn:hr:168:463123
• Study programme: Title: Postgraduate master programme in electrical engineering; Study programme type: university; Study level: postgraduate; Academic / professional title: Magistar znanosti elektrotehnike (Magistar znanosti elektrotehnike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-12-20 09:21:43