Operation of Circuit Breakers: Data and Analysis (original) (raw)
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IJERT-Reliability Analysis of Circuit Breakerin the Nigerian 330-kV Transmission Network
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/reliability-analysis-of-circuit-breakerin-the-nigerian-330-kv-transmission-network https://www.ijert.org/research/reliability-analysis-of-circuit-breakerin-the-nigerian-330-kv-transmission-network-IJERTV3IS030541.pdf This paper is concerned with using the fault analysis to establish the requirements for the proper selection of circuit breaker; A Case Study of Power Holding company of Nigeria (PHCN) 330-kV Transmission Grid System. The work is modelled for Fault Analysis and it is written in a flexible MATLAB programs to accommodate addition or reduction in the Transmission Grid System. It aimed at establishing the Circuit Breaker Capacity at any point in the system. The result is then compared with the existing circuit breaker capacity of PHCN 330-kV system. The short-circuit fault is simulated by combining a solution of algebraic equations describing the changes in the network with a numerical solution of the differential equations. Two MATLAB programs were written and simulated; one for Lord Flow study to know the pre-fault bus voltages based on Gauss-Seidel Method; the other for Short Circuit Studies which made use of Thevenin's theorem application. The highest Circuit Breaker Capacity established by the result of this study is relatively lower and the investments needed for this are smaller compared with the normal practice with PHCN system. This reveals that PHCN system can be protected with this low capacity circuit breaker with a reduced cost effectiveness and equal sensitivity which is a breakthrough in terms of Circuit Breaker Capacity in the field of power system protection.
International journal of engineering research and technology, 2020
Any power system needs protection to protect it from any undesirable fault currents and that's why we have protection devices such as Circuit breakers which will break the current during faults to protect the system. This paper shows the basic classification of circuit breakers types and the basic knowledge for students to know this information.
IJERT-Review on Circuit Breakers
International Journal of Engineering Research and Technology (IJERT), 2020
https://www.ijert.org/review-on-circuit-breakers https://www.ijert.org/research/review-on-circuit-breakers-IJERTV9IS110133.pdf Any power system needs protection to protect it from any undesirable fault currents and that's why we have protection devices such as Circuit breakers which will break the current during faults to protect the system. This paper shows the basic classification of circuit breakers types and the basic knowledge for students to know this information.
The Analysis of Failed-type and Symptom of High Voltage Circuit Breaker for Performance Assessment
The performance of high voltage equipment in electrical power system should be assessed and clearly identified as supported reasons for planning the renovation task of electrical asset. Thus, the performance assessment based on failed-type and symptom for high voltage circuit breakers rated as of 115 kV, 230 kV and 500 kV are focused in this work. The scattering failure events are systematically recorded and analyzed by using statistical techniques. Since numbers of circuit breakers from each manufacturer are different, the failure rates of every manufacturer are calculated and compared. After that the failure evaluation is performed. Then, the symptoms of failure are classified for each voltage level. The known failure rate and symptom are used as criteria for performance evaluation of those high voltage circuit breakers. The proposed criteria can also used with other high voltage equipment in the power system.
Types of Circuit Breaker and its Application in Substation Protection
Indonesian Journal of Electrical Engineering and Computer Science
Power system consists of the generation, transmission, distribution, and substation. All the power system component requires suitable protection devices as the protection system to protect the system during fault occur. In this paper, the circuit breaker has been selected as one of the protection devices in several applications. The types of circuit breaker that has been reviewed in this paper are oil circuit breaker (OCB), air circuit breaker (ACB), sulphur hexafluoride (SF6) circuit breaker, vacuum circuit breaker, and DC breaker which are hybrid DC breaker and solid-state DC breaker. Normally, the systems or the circuits disrupted or damaged by the fault. To implement the protection system in the system or circuit, the type of faults and cause of faults should be known to overcome the fault. To provide the suitable voltage for the consumer, the substation is needed to control the voltage transmitted at high voltage from the generating station. Protection system is also required i...
Influence of circuit breaker replacement on power station reliability
Facta universitatis - series: Electronics and Energetics
35/10 kV substation. Substation reliability calculation is carried out for 5 different scenarios of CB removal with their expenses. At the end, discounted investment costs for each action and period of 5 years are calculated and are shown in table. For this substation final results are showing best scenario with removal CB's on power transformers.
International Journal of Advances in Applied Sciences (IJAAS), 2023
One of the major challenges hindering the effective operation of the electricity distribution system is the malfunctioning of the protection scheme. Therefore, in this study, the performance of an interrupter (oil circuit breaker (OCB)) on the Eko Electricity Distribution Company (EKEDC) network was assessed. Five-year outage data (2014 to 2018) regarding tripping of the interrupter on fault and health conditions were collected from the EKEDC Agbara/Badagry Business Unit. The tripping frequency was compared. Inspection of selected OCBs within the considered network was conducted over the study period. A breakdown voltage (BDV) test was carried out on six oil samples each for 11 and 33 kV OCB using Megger OTS60PB. The highest tripping frequency of 75 and 10 were observed in 2014 and 2018 respectively when the interrupter tripped on fault and healthy conditions. The lowest tripping frequency was, however, observed in 2018 with values of 46 and 7 respectively when the interrupter tripped on fault and healthy conditions. The inspection conducted revealed carbonized OCB contacts. The BDV test showed that two oil samples each violated the standard value of 40 kV for 11 and 33 kV OCBs respectively. This study indicated that the defective oil samples required filtration or complete replacement.
Power Circuit Breaker Types Their Advantages and Disadvantage
Protection of power systems is as important as establishing of power systems. The protection system of any power systems must be fast and accurate to respond to abnormal condition and must eliminate the fault circuit from the system before any damage. For this purpose, we use different protecting devices, such as circuit breakers, fuses, relays etc. Circuit breaker is main protecting device in power system which works mechanically. It works in closed position during normal conditions and opens in abnormal condition. This paper discusses working of different types of circuit breakers, also discusses their working and medium used for arc extinction. This paper also discusses advantages and disadvantages of the circuit breakers.
A Review Paper on Hybrid Circuit Breaker
IAEME PUBLICATION, 2015
To ensure safe and healthy operation of electrical power system network, high voltage circuit breakers are really important so that faulty sections can be effectively isolated from the healthy part of network. Depending on transmission line’s power rating vacuum circuit breakers and SF6 circuit breakers are an effective choice. A need of hybrid model of circuit breakers is analyzed by reviewing the merits and demerits of the two mentioned above.