Effective and efficient circuit breaker analysis

Jeyaraj, Simanand Gandhi; Habtay, Yehdego

doi:10.1049/cp.2011.0532

Cited by 9 publications

(2 citation statements)

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“…Ankara Bölgesi sorumluluğunda bulunan 400 kV Gölbaşı trafo merkezine bağlı 4 hatta kısa devre arızası oluşturulmuştur. Normal koşullarda hatta bir kısa devre arızası meydana geldiğinde hattın bağlı bulunduğu trafo merkezlerinde yer alan mesafe koruma röleleri arızayı tespit edip kesicilerine açma komutu gönderirler ve kesiciler açarak arıza temizlenir [18][19][20]. Bu analizde, hatta meydana gelen kısa devre arızası esnasında kesici arızası, röle arızası, iletişim arızası gibi herhangi bir sebeple kesicinin açmaması ve arızanın beklenen süresinde temizlenememesi durumunda arızayı kademelerinde gören diğer mesafe koruma rölelerinin davranışları ve arızanın nasıl temizlendiğine dair incelemelerde bulunulmuştur.…”

Section: şEkil 3 Ankara Bölgesi (400 Kv Hatlar)unclassified

Ankara Bölgesi İçin Enerji İletim Hattı Koruma Modellemesi Analizi ve Uygulaması

Saygılı¹,

Tezcan

2019

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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In this study, settings of distance relays which are used in simulations are based on setting principles determined by transmission system operator. In simulations, different cases are investigated in terms of fault currents, behaviours of relays, lines became out of service. Analysis of Ankara Region is presented. Figure A. Block schema of the Ankara Region Purpose: Main purpose of this study is performing line protection analysis on simulation program in a regional base utilising real system parameters. Theory and Methods: In this study, 400 kV transmission lines in Ankara have been modelled and simulated in DIgSILENT power system analysis program and protection analysis is performed. It is investigated how a fault is cleared from the power system in cases such that the relay could not detect the fault or not operate, mulfunctioning of circuit breaker. Also it is inspected that effect of this situation on power system. Unlike other studies, real time load flow data and real bus systems are used for modelling. Settings of distance relays which are used in simulations are based on setting principles determined by transmission system operator. Results: Simulation results show that, if a short circuit fault at transmission line could not been cleared by main protection, it is cleared by back up protection which is third zone of distance protection. Substation and lines connected that substation are became out of service. Conclusion: In this study, it is used real system datas on power system analysis software to simulate energy transmission lines in one region in terms of protection. It is obtained important results and offered significant suggestions for field protection engineers. Whole power system shall also be analysed in future work.

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Section: şEkil 3 Ankara Bölgesi (400 Kv Hatlar)unclassified

Ankara Bölgesi İçin Enerji İletim Hattı Koruma Modellemesi Analizi ve Uygulaması

Saygılı¹,

Tezcan

2019

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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“…Therefore, for the complete consolidation of the DRM as contact degradation level technique, additional parameters beyond the area under the DRM curve should be addressed. Additional evaluating parameters were studied over the years, such as: the level of mass transferred by the contacts [15]; acoustic vibration [16]; average arcing and MC resistances (MCRs) [17, 18]; time difference between separation of the main and AC [19] and; maximum resistance over the entire curve [20].…”

Section: Introductionmentioning

confidence: 99%

Analysis of alternative parameters of dynamic resistance measurement in high voltage circuit breakers

et al. 2019

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Throughout its lifetime, high-voltage circuit breaker (HVCB) contacts suffer from inevitable degradation processes, especially during the formation of electric arcs. Highly degraded contacts can reduce the current interruption capacity and increase the chances of operational faults, which might lead to considerable financial losses. Therefore, the use of efficient evaluating techniques is a key factor to achieve systems reliability. The dynamic resistance measurement (DRM) is a technique that can be used to evaluate the degradation level of HVCB' contacts. It stands out from the usual technique, static resistance measurement, by allowing the assessment of both the main contacts and the arcing contacts (ACs). Usually, the mean resistance or the area under the DRM curve is used to estimate the AC degradation. However, DRM is a non-standardised technique and there are no specified parameters to evaluate the real wear conditions. Therefore, an analysis of alternative parameters extractible from the DRM technique is presented in this study, such as amplitude and variance of the DRM curve. The results attest the possible use of more than one parameter for the continuous evaluation of HVCB ACs, characterising the DRM as a more complete and precise diagnosis tool.

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Study of Ablation of Arc Contacts and Dynamic Contact Resistance in High Current Breaker

Xing

Zhang

Tong

et al. 2020

J. Electr. Eng. Technol.

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The fault of power circuit breaker (PCB) can lead very serious problems, especially in high voltage-power grid. The structure of contacts may be composed of main contacts and arc contacts, and this structure can avoid ablation of main contacts efficiently. It is necessary to study the eroded state of the arc contacts and the dynamic contact resistance of arc contacts to estimate the operating state of the PCB. The wear of contacts contains arc ablation and mechanical wear through the characteristics of contacts. The arc ablation is caused by the high temperature of the arc and the mechanical wear is caused by the mechanical friction of static and movable contacts. Some experiments have been done under different size of contacts and different current through them. The results show that the mechanical wear increases, sometimes heavier, with the increase of the size of fixed contacts and the decrease of the size of movable ones because the force between fixed and movable contacts becomes larger. The results also show that the ablation of arc contacts increases with the increase of current, especially when the current is up to 20 kA. With the high temperature of arc reaching the hardness point of copper, the arc ablation and mechanical erosion are increasing obviously since the contacts become soft and easy to wear. Another result of the study shows it is important to choose the material of contacts and the force between movable and fixed contacts. The harder and less resistance the material of contacts, the better the operating situation. To monitor the operating situation of the breaker, the dynamic contact resistance was measured 25 times. As a result, the dynamic contact resistance is sensitive to the current and increasing with the increase of continuous experiment time because of the increasing of metal ions. Furthermore, if the SF 6 in the PCB is changes, the dynamic contact resistance would be changed. The dynamic contact resistance in this experiment varies substantially within the range of 80-250 μΩ at the current of 20 kA.

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Effective and efficient circuit breaker analysis

Cited by 9 publications

References 0 publications

Ankara Bölgesi İçin Enerji İletim Hattı Koruma Modellemesi Analizi ve Uygulaması

Ankara Bölgesi İçin Enerji İletim Hattı Koruma Modellemesi Analizi ve Uygulaması

Analysis of alternative parameters of dynamic resistance measurement in high voltage circuit breakers

Study of Ablation of Arc Contacts and Dynamic Contact Resistance in High Current Breaker

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