Готові списки джерел за темами / MV fault grounding

Добірка наукової літератури з теми "MV fault grounding"

Автор: Grafiati

Опубліковано: 14 березня 2023

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Зміст

Статті в журналах

Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "MV fault grounding".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Статті в журналах з теми "MV fault grounding"

Lukač, Marijan, Krunomir Petric, Vide Marković, and Katarina Mikulić. "Operational Experience in Determining the Earth Fault on Resonant Grounded Networks." B&H Electrical Engineering 13, no. 1 (December 1, 2019): 86–94. http://dx.doi.org/10.2478/bhee-2019-0011.

Повний текст джерела

Анотація:

Abstract Resonant grounding of the medium voltage (MV) network’s neutral point improves the power quality and creates conditions for development of more reliable network. By changing the way of the MV network grounding, conditions for relay protection of single phase fault (earth fault) are changed due to reduced value of zero sequence current during earth fault and demands on the relay protection are increased. Protection system is not able to selectively detect earth fault with high transient resistance and repetitive current earth faults in cable network, so it requires more sensible approach. In case of fault detection, technically more demanding fault indicators must be used. This article will show experiences in detecting earth faults in resonant grounded MV network of Elektra Zagreb.

Стилі APA, Harvard, Vancouver, ISO та ін.

Bernadić, Alen, and Zahira Anane. "NEUTRAL POINT CONNECTIONS IN MV POWER NETWORKS WITH GROUNDING ZIGZAG TRANSFORMERS – ANALYSIS AND SIMULATIONS." Journal of Energy - Energija 68, no. 1 (April 30, 2019): 42–48. http://dx.doi.org/10.37798/20196812.

Повний текст джерела

Анотація:

Treatment of transformer neutral point in middle-voltage (MV) networks become an important issue with increasing proportion of MV cables in power networks. As consequence, overall capacitance of MV network is increased and moreover earth fault currents magnitudes. In MV networks with feeding transformer winding in delta connection (isolated networks), that earth fault current increase requires forming of artificial ground point – a neutral connection point on a three-phase ungrounded power system. Grounding transformer use, in zigzag or delty-wye connection, is common, well-known solution for constructing neutral connection in power systems. Physical characteristics of grounding transformers, protection principles, short-circuit calculations with symmetrical components and simulation techniques are presented in this paper. Characteristical operational modalities of MV power networks are also revieved on practical examples.

Стилі APA, Harvard, Vancouver, ISO та ін.

Wu, A., Y. Tang, and D. Finney. "MV Generator Low-Resistance Grounding and Stator Ground Fault Damage." IEEE Transactions on Industry Applications 40, no. 2 (March 2004): 672–79. http://dx.doi.org/10.1109/tia.2004.824499.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Opačak, Hrvoje, Tihomir Čalić, and Siniša Jergović. "Influence of grounding transformer on ground fault current in MV networks." CIRED - Open Access Proceedings Journal 2017, no. 1 (October 1, 2017): 733–37. http://dx.doi.org/10.1049/oap-cired.2017.0653.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Polajžer, Boštjan, Matej Pintarič, Janez Ribič, Miran Rošer, and Gorazd Štumberger. "Parametrization of ground-fault relays in MV distribution networks with resonant grounding." International Journal of Electrical Power & Energy Systems 143 (December 2022): 108449. http://dx.doi.org/10.1016/j.ijepes.2022.108449.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Toader, Dumitru, Marian Greconici, Daniela Vesa, Maria Vintan, Claudiu Solea, Adrian Maghet, and Ildiko Tatai. "The Influence of the Characteristics of the Medium Voltage Network on the Single Line-to-Ground Fault Current in the Resistor Grounded Neutral Networks." Designs 5, no. 3 (August 7, 2021): 53. http://dx.doi.org/10.3390/designs5030053.

Повний текст джерела

Анотація:

One important problem in the operation of medium voltage networks is the detection of a single-line-to-ground fault in its incipient state, when the fault resistance values are very high. In a medium voltage (MV) distribution network with a neutral grounding resistor (NGR), one of the methods employed to discriminate a single line-to-ground fault is the use of an overcurrent relay with an operating characteristic adjusted according to the effective value of the current flowing through the limiting resistor. In case of a single line-to-ground fault with a high fault resistance value, the correct tripping settings of the protective relay require the precise computation of this current. In comparison to the assumptions made by the models from the literature—the three-phase voltage system of the medium voltage busbars is symmetrical and there are no active power losses in the network insulation—the model proposed in this paper considers the pre-fault zero-sequence voltage of the medium voltage busbars and the active power losses in the network insulation, which is necessary in certain fault conditions where the use of the former leads to unacceptable errors.

Стилі APA, Harvard, Vancouver, ISO та ін.

Schött-Szymczak, Aleksandra, and Krzysztof Walczak. "Impact of Cable Configuration on the Voltage Induced in Cable Screen during Work with One-Sidedly Ungrounded Cable Screen." Energies 14, no. 14 (July 14, 2021): 4263. http://dx.doi.org/10.3390/en14144263.

Повний текст джерела

Анотація:

In the latest research, it has been proven that from the point of view of losses in a cable distribution line, the most advantageous operation is to work with two or one phase of metallic cable screen ungrounded. However, such an operation may cause changes in the network characteristics and thus the occurrence of undesirable phenomena. One of those characteristics is the overvoltages in those cable screens, which can lead to cable line damage. The simulation tests presented in this article are closely related to the unusual method of operation of the MV cable screens and their performance, and they address the question of whether in a given system ground fault overvoltages may be a significant threat to the operation of the cable. The research methods used to verify these risks are related to the simulation of the cable line operating states using the DIgSILENT PowerFactory program (DIgSILENT GmbH, Gomaringen, Germany). Overvoltage simulations were performed, taking into account changes in the network configuration, such as the method of cable screens grounding, the length of cable lines, the cross-section of the conductor and cable screen, or the method of operation of the neutral point. The results for the cable line modeled as a part of the MV network with the variables considered during the tests indicate the possible impact of the one-sidedly cable screen ungrounding on overvoltages in this cable screen. The obtained results at the level of a few kV in one-sidedly ungrounded cable screens show that the change of the configuration of the operation of these cable screens may affect the safety of the network operation.

Стилі APA, Harvard, Vancouver, ISO та ін.

Basu, Kartik Prasad, and Moley Kutty George. "Maintenance of Three-phase Load Voltage during Single Phase Auto Reclosing in Medium Voltage Radial Distribution Lines." International Journal of Emerging Electric Power Systems 12, no. 4 (July 21, 2011). http://dx.doi.org/10.2202/1553-779x.2703.

Повний текст джерела

Анотація:

Most faults in medium voltage (MV) distribution lines are temporary line to ground (LG) faults. Three-phase auto reclosing (TPAR) is commonly used to remove this fault with temporary disconnection of all the phases. Multi-shot single-phase auto reclosing (SPAR) may also be used to remove the LG fault. But it produces highly unbalanced and low voltage across the load during the reclosure dead time. It is proposed to connect a zigzag winding grounding transformer at the load bus to maintain the 3-phase load voltage when one phase opens during the SPAR. With low value of grounding resistance the 3-phase voltage during the SPAR dead time becomes approximately balanced. Directional over current relays may be used for the protection. Analysis of a MV radial distribution system having a zigzag transformer connected to the remotest load bus is presented with the computation of voltages during the dead time of SPAR.

Стилі APA, Harvard, Vancouver, ISO та ін.

AKBAL, Bahadır. "Designing of High Voltage Cable Bonding with Intelligence Algorithms to Avoid Cable Insulation Faults and Electroshock in High Voltage Lines." Journal of Engineering Research, January 3, 2022. http://dx.doi.org/10.36909/jer.14871.

Повний текст джерела

Анотація:

The insulation fault is a major problem in high voltage cable lines. The major factors in the insulation faults are harmonic currents and the metal sheath voltage (MV) that occur on the metal sheath of cable. MV and harmonic distortion should be minimized to prevent insulation faults. Thus, sectional solid bonding with different grounding resistance (SSBr) method is developed as a new bonding method for minimizations of harmonic current and MV. Also, SSBr should be optimized by optimized according to minimum MV and harmonic distortion rate of high voltage cable. Inertia weighted particle swarm optimization (iPSO), particle swarm optimization (PSO), genetic algorithm (GA) and differential evolution algorithm (DEA) are used for optimization of SSBr, and three groups the prediction methods are used separately as objective function of the optimization methods to determine minimum MV and harmonic distortion. These groups are neural networks, hybrid neural networks and regression methods. Hybrid neural network with inertia weighted particle swarm optimization (H-iPSO), linear regression and feedforward backpropagation neural network are selected from their groups according to training errors. Solid bonding method is widely used for bonding of high voltage cable, and solid bonding is simulated in this study. When solid bonding is used for bonding of cable, maximum harmonic distortion rate is measured as 8.15 %, and maximum MV is measured as 1086 V. When H-iPSO is used as prediction method, and PSO is used as optimization method, maximum harmonic distortion rate is measured as 5,28 %, and maximum MV is measured as 57 V. Namely, both insulation fault and electroshock can be prevented by the optimized SSBr method.

Стилі APA, Harvard, Vancouver, ISO та ін.

Ми пропонуємо знижки на всі преміум-плани для авторів, чиї праці увійшли до тематичних добірок літератури. Зв'яжіться з нами, щоб отримати унікальний промокод!