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Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Shunt capacitor Banks"

1

Rajabali Pour, Mohsen, and Mohammad Azimian. "Analysis of high voltage shunt capacitor bank over-voltage breakdown detection." Future Energy 1, no. 1 (May 15, 2022): 16–23. http://dx.doi.org/10.55670/fpll.fuen.1.1.11.

Повний текст джерела
Анотація:
The traditional over-voltage breakdown detection method ignores the suppression of the inrush current of over-voltage breakdown, resulting in low over-voltage signal detection accuracy and a large detection deviation. As a result, a method is proposed for detecting and analyzing the ageing over-voltage breakdown of high voltage shunt capacitor banks. The breakdown model of aged components of the container group is built to determine the breakdown time of the container's overvoltage. Based on this, the annual load of the capacitor bank's aged component material is evaluated, and data on over-voltage breakdown strength is collected. The Mallet algorithm is used to decompose and convert strength data into electrical signals. The high voltage shunt capacitor's over-voltage breakdown inrush current suppressor is built by combining the second-order under damping circuit and the voltage divider. Based on this, the parameters of HV shunt capacitor overvoltage breakdown are obtained, and the detection of HV shunt capacitor overvoltage breakdown of aged HV shunt capacitor banks is completed. The simulation results show that the proposed detection method's over-voltage breakdown output is in perfect agreement with the monitoring device's actual output and has ideal application performance.
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2

Lin, Yifeng, Jingfu Gan, and Zengping Wang. "On-Line Monitoring of Shunt Capacitor Bank Based on Relay Protection Device." Energies 16, no. 4 (February 6, 2023): 1615. http://dx.doi.org/10.3390/en16041615.

Повний текст джерела
Анотація:
In modern power systems, the installation of a shunt capacitor bank is one of the cheapest and most widely used methods for improving the voltage profile. One shunt capacitor bank is composed of mass capacitor units and have ground, ungrounded, delta, wye connections that make configuration of capacitor banks is various. In the case of long-term operation, the failure of a single capacitor unit of a capacitor bank is likely to cause uneven voltage, which will lead to the breakdown and burning of the whole group, resulting in huge losses. The relay protection device can detect the simultaneous voltage and current of the capacitor. By utilizing these data from the relay, the abnormal state of the shunt capacitor banks at the initial stage of the fault can be found through monitoring the slight change in capacitance. Timely and early maintenance and repair would avoid capacitor bank faults and potentially greater economic losses. Capacitor banks have different connection modes. For ungrounded wye-connected capacitor banks with an unknown neutral point voltage, the capacitance parameters of each branch cannot be calculated. A parameter symmetry based on the calculation method for capacitor parameters is proposed. For long-term monitoring and observation of the capacitor capacitance value, the fault state and abnormal state of the capacitor are identified based on statistical methods. The simulation established by PSCAD verified that a relay protection device can realized an effective monitoring of the early abnormal state of the capacitor bank.
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3

Uchendu, Moses. "Placement of Distributed Generation and Shunt Capacitor in Distribution Network using Cuckoo Search Algorithm." Nigerian Journal of Technological Development 17, no. 2 (July 22, 2020): 79–87. http://dx.doi.org/10.4314/njtd.v17i2.2.

Повний текст джерела
Анотація:
This work aims at reduction in active and reactive power loss reduction in distribution networks as well as to improve the voltage stability of the networks. Optimum Distributed Generation (DG) placement and sizing is carried out in conjunction with shunt capacitor placement and sizing to determine the appropriate sizes of DG units and Capacitor banks to be placed in the networks so as not to violate certain constraints. The optimal sizes of the DG units and capacitor banks were obtained on application of a Cuckoo Search Optimization Algorithm while computations for Voltage stability was performed using the Voltage Stability Index (VSI). The obtained optimal sizes of DG units and Capacitors were individually and simultaneously placed on the distribution networks to ascertain the behaviour of the networks prior to and after their placements. The performance factors considered are power loss and voltage stability. A comparison of these performance factors under separate and simultaneous placement method was demonstrated using IEEE 33 and 69 test buses. Result show that power loss (active and reactive) reduced by 63.29% and 59.38% respectively for 33 bus system, with a 74.29% and 79.19% reduction on 69 bus system. Voltage stability also increased by 7.89% and 3.79% respectively for 33 and 69 bus system relative to values obtained for base case and separate DG and shunt capacitor placement. Keywords: Distributed generation, shunt capacitor, Cuckoo Search Algorithm (CSA), power loss and voltage stability.
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4

van der Sluis, L., and A. L. J. Janssen. "Clearing faults near shunt capacitor banks." IEEE Transactions on Power Delivery 5, no. 3 (July 1990): 1346–54. http://dx.doi.org/10.1109/61.57976.

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5

Xiong, Xiao Ping, Jing Jie Hu, and Qiang Fu. "Analysis on Unbalance Protection of SCB." Applied Mechanics and Materials 341-342 (July 2013): 1423–28. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.1423.

Повний текст джерела
Анотація:
Shunt capacitor is a main measure to reactive power compensation of power system, which has the advantages of flexibility and economy. In order to guarantee the safety of shunt capacitor, the methods for protecting against over-voltage, under-voltage, over-current and unbalance in circuits according to the different operation modes are used. This paper in detail introduces unbalance protection ways under different connection modes of capacitor group. It is analyzed and calculated that the unbalanced current and voltage with the effects of fault capacitor units, components and fuses on capacitor bank as well through a case of unbalance computation of shunt capacitor banks (SCB) of ungrounded single star with external fuse. It is indicated by PSCAD simulation analysis that the result of theory calculation is the same as the simulation, which provides theory basis of setting the tripping point and alarm point of relay protection.
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6

Wang, Yong Yuan, Sheng Hui Liu, Wen Ze Liu, and Ke Ying Wang. "Restrike Modeling of Vacuum Circuit Breaker Switching Off Shunt Capacitor Banks with EMTP." Advanced Materials Research 383-390 (November 2011): 2287–92. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.2287.

Повний текст джерела
Анотація:
The shunt power capacitors are used as a reactive compensator while vacuum circuit breakers are used to switch shunt capacitors in power grid. To research the high over-voltage during switching off the shunt capacitors and a vacuum circuit beaker restriked, the restriking model is built with three-phase vacuum circuit breakers, considering the capacitors’ energy storage characteristic and asynchronous operating. The over-voltage is harmful to the insulation and life-circle of the equipments and even threatens power system safe and stabile operation. The variation trends of both recovery voltage between the contacts and the capacitors voltage are theoretically deduced. The model based on a 220kV substation of Guangdong grid was built and the most serious case that breakers are restriked in two phases are numbered with EMTP. Compared with theoretical results, simulation results are valid and practical.
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7

Mquqwana, Manduleli Alfred, and Senthil Krishnamurthy. "System-Based Testing of Protection for Center-Tapped Shunt Capacitor Banks." Energies 15, no. 10 (May 21, 2022): 3791. http://dx.doi.org/10.3390/en15103791.

Повний текст джерела
Анотація:
In power systems, capacitor banks play a significant role in improving voltage profiles, reducing losses, and adjusting power factors. Security measures must be implemented quickly and reliably to protect them from a wide range of threats. As a consequence of capacitor bank failures, finding and fixing the damaged units/elements is more difficult, which may lead to voltage control difficulties or the loss of any of these benefits. The paper shows the application of system-based testing methods for protection systems using RelaySimTest software, which works with OMICRON injection test sets. System-based testing methods are applied to test voltage differential protection for center-tapped shunt capacitor banks. The use of system-based testing methods has many advantages over conventional testing methods, which include distributed testing, transient state conditions testing, etc., which in turn result in cost savings during the commissioning and testing phase. The impact of external faults on bank installation has been tested successfully.
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8

Ebrahimi Moghadam, Majid, Hamid Falaghi, and Mahdi Farhadi. "A Novel Method of Optimal Capacitor Placement in the Presence of Harmonics for Power Distribution Network Using NSGA-II Multi-Objective Genetic Optimization Algorithm." Mathematical and Computational Applications 25, no. 1 (March 19, 2020): 17. http://dx.doi.org/10.3390/mca25010017.

Повний текст джерела
Анотація:
One of the effective ways of reducing power system losses is local compensation of part of the reactive power consumption by deploying shunt capacitor banks. Since the capacitor’s impedance is frequency-dependent and it is possible to generate resonances at harmonic frequencies, it is important to provide an efficient method for the placement of capacitor banks in the presence of nonlinear loads which are the main cause of harmonic generation. This paper proposes a solution for a multi-objective optimization problem to address the optimal placement of capacitor banks in the presence of nonlinear loads, and it establishes a reasonable reconciliation between costs, along with improvement of harmonic distortion and a voltage index. In this paper, while using the harmonic power flow method to calculate the electrical quantities of the grid in terms of harmonic effects, the non-dominated sorting genetic (NSGA)-II multi-objective genetic optimization algorithm was used to obtain a set of solutions named the Pareto front for the problem. To evaluate the effectiveness of the proposed method, the problem was tested for an IEEE 18-bus system. The results were compared with the methods used in eight other studies. The simulation results show the considerable efficiency and superiority of the proposed flexible method over other methods.
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9

Sun, Qiuye, Jianguo Zhou, Xinrui Liu, and Jun Yang. "A Novel Load-Balancing Method and Device by Intelligent Grouping Compound Switches-Based Capacitor Banks Shunt Compensation." Mathematical Problems in Engineering 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/347361.

Повний текст джерела
Анотація:
A novel compensator topology is proposed for three-phase unbalanced loads in the distribution networks. The negative and zero sequence compensation networks are proposed using delta-connected and star-connected capacitor banks. The compensation networks are paralleled with the unbalanced load to achieve a perfect balancing of active power and a complete compensation of reactive power of the unbalanced load. Intelligent grouping compound switches are implemented to control the capacitors, where, therefore, each capacitor can be switched between phases or phase and ground. Wireless sensors are also applied to acquire the load quantities. The compensation method proposed is based on symmetrical component theory. In addition, the load compensation based on instantaneous symmetrical component theory with positive sequence online extraction is proposed under unbalanced and distorted source voltages. The proposed load-balancing method and device are applied to Liaoning, Neimenggu, and Jilin provinces. The application results are provided to validate the performance of the proposed compensator topology and compensation method.
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10

Dovgun, V. P., D. E. Egorov, V. V. Novikov, and A. F. Sinjagovsky. "Shunt power factor correction devices for damping of harmonic resonance in industrial power systems." Power engineering: research, equipment, technology 24, no. 4 (August 17, 2022): 77–89. http://dx.doi.org/10.30724/1998-9903-2022-24-4-77-89.

Повний текст джерела
Анотація:
THE PURPOSE. Harmonic resonance has become a serious problem of shunt capacitor banks for reactive power and voltage support. Effective solution to damp out the capacitor-caused resonance is the series connection of capacitor bank with harmonic damping network. This paper presents a general design method for shunt capacitive compensating units with damping networks. The damping unit is designed in such a way that it provides harmonic filtering and adequate damping of the transient oscillations. METHODS. The method was developed for designing damping network in the form of ladder LC-two-port. The design is based on minimization of voltage total harmonic distortion (VTHD) in the point of common coupling. Normalized element parameters of the different order damping networks have been determined. RESULTS. Comparative study of transient behavior of shunt capacitive compensating units with damping networks illustrate the effectiveness of the propose structure. It has been observed that there is a significant reduction of transient overvoltage in switching of capacitor bank with damping network. CONCLUSION. This paper presents a new design method for capacitive compensating units with damping networks for industrial power systems with powerful nonlinear loads. The paper illustrates superior performance characteristics of proposed shunt capacitive compensating units by computer simulations.
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Більше джерел

Дисертації з теми "Shunt capacitor Banks"

1

Van, der Toorn Sean. "The protection of high-voltage shunt capacitor banks." Master's thesis, University of Cape Town, 1999. http://hdl.handle.net/11427/19565.

Повний текст джерела
Анотація:
Bibliography: pages 86-88.
The use of shunt capacitor bank equipment is essential if a utility wishes to control the flow of reactive power effectively. The most significant results stemming from this will be lower losses on the system and an increased power transfer capability. Thus it is important that the methods used to protect a shunt capacitor bank will ensure that the bank is available when required. While the more common shunt capacitor problems are related to capacitor unit failures, conditions such as bank over currents, surge voltages and harmonics can cause extended undesired conditions. Today's protection methods are able to remove a shunt capacitor bank from service before extensive damage is done, although the location of the faulty capacitor units will not be known (if this was in fact the reason for the protection tripping the bank). This thesis explores the subject of improving the protection of high-voltage shunt capacitor banks, specifically with respect to the detection of unhealthy fuseless capacitor units. An extensive literature search was carried out on the theory pertaining to the protection of shunt capacitor banks, and a model of a fuse less shunt capacitor bank was built in the laboratory to better understand the failing process of an element within a capacitor unit. The changes in the capacitor unit's current and voltage profiles, as well as those of the remaining healthy capacitor units, were monitored as an element failure was simulated (whereby the element forms a solid weld, or short circuit).Stemming from these experiments, it was found that where a bank consists of strings of units with no interconnection between the units of different strings, an element failure in a capacitor unit would cause a significant decrease in voltage across the affected unit. This voltage change could be used to identify when elements are failing in capacitor units, and the location of the unhealthy unit could also be determined. One potential method would be to have capacitor units with built-in voltage transformers attached across each element section in the unit. As element failures occur either send this information to ground level, where it can be read by a microprocessor relay device, or have a display on the outside of the capacitor unit. In the case of the change in unit current, it was found to be very small and thus had no function for detecting unhealthy capacitor units.
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2

Welbourn, Mark. "Reaktiv effekt i Dala Energis framtida mellanspänningsnät." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-160670.

Повний текст джерела
Анотація:
Dala Energi has large-scale plans for grid development and wants to have a better understanding of their current reactive power levels along with a future prognosis based on their plans. Changes in line inductance, shunt capacitance, area and placement put Dala Energi on the path to higher charging currents and higher reactive power generation. In addition to causing concerns in their own grid, the increased reactive power generation can present challenges for the owner of the overlying grid. Transmission of reactive power upwards is not permitted in the current contract. Dala Energi’s grid is divided into 3 separate regions with a total of 19 larger substations, 12 of which are points of connection with the overlying grid. At times, 8 of the substations have transmitted reactive power upward and soon it will be all 12. Region 1, where the 20-kV grid is located, is the biggest problem-area today, with upward-transmissions of 1 to 3 MVAr quite common and a considerable increase expected. Region 3 contains more than double the underground cable as the other two areas and might have had much greater side effects from the high shunt capacitance were it not for 3 industrial customers who consume a large portion of reactive power. In the coming years, however, Region 3 is expected to have capacitive reactive power levels nearly equal to those of Region 1. The combined reactive power baseline for all regions is expected to drop by 8.24 MVAr in the coming years. The owner of the overlying grid controls Dala Energi’s 5 largest capacitor banks which have a rated capacity of 11.6 MVAr. With the entire capacity almost always connected, the upward transmission of reactive power becomes much greater. It would be very advisable to meet with the owner, discuss interaction between the two grids and examine the details of the current contract. Compensation for excessive generation of reactive power is needed and is going to be essential in the future. The short-term variation of reactive power levels is so great that the use of fixed rating shunt reactors is ill-advised, especially under the current contract. Compensation with variable shunt reactors is recommended.
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3

Patterson, Russell William. "Analysis of two-stage shunt capacitor bank protection deficiencies with mitigation suggested." Thesis, The University of Tennessee at Chattanooga, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1544278.

Повний текст джерела
Анотація:

A large utility was experiencing a problem when switching a two-stage capacitor bank resulting in misoperations of the bank protection. When the bypass switch is opened a long duration dc offset occurs across all capacitors. This dc causes saturation of the tap point VT resulting in a false differential voltage and misoperation of the protection. The utility had to disable the voltage differential during switching until the phenomenon could be studied and a suitable solution found.

The work is a comprehensive analysis of the transients affecting the protection and how the problem could be mitigated.

An analytical approach was taken to understand the occurrence of the dc offset and an Electromagnetics Transients Program (EMTP) was used to study various mitigation techniques. A simple solution is presented for future installations that prevents the problem completely. A "next best" mitigation is presented for existing banks where reconfiguration would not be cost justified.

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4

Ramli, Mohd Shamir. "Investigation of circuit breaker switching transients for shunt reactors and shunt capacitors." Thesis, Queensland University of Technology, 2008. https://eprints.qut.edu.au/17822/1/Mohd_Shamir_Ramli_Thesis.pdf.

Повний текст джерела
Анотація:
Switching of shunt reactors and capacitor banks is known to cause a very high rate of rise of transient recovery voltage across the circuit breaker contacts. With improvements in circuit breaker technology, modern SF6 puffer circuits have been designed with less interrupter per pole than previous generations of SF6 circuit breakers. This has caused modern circuit breakers to operate with higher voltage stress in the dielectric recovery region after current interruption. Catastrophic failures of modern SF6 circuit breakers have been reported during shunt reactor and capacitor bank de-energisation. In those cases, evidence of cumulative re-strikes has been found to be the main cause of interrupter failure. Monitoring of voltage waveforms during switching would provide information about the magnitude and frequency of small re-ignitions and re-strikes. However, measuring waveforms at a moderately high frequency require plant outages to connect equipment. In recent years, there have been increasing interests in using RF measurements in condition monitoring of switchgear. The RF measurement technique used for measuring circuit breaker inter-pole switching time during capacitor bank closing is of particular interest. In this thesis, research has been carried out to investigate switching transients produced during circuit breaker switching capacitor banks and shunt reactors using a non-intrusive measurement technique. The proposed technique measures the high frequency and low frequency voltage waveforms during switching operations without the need of an outage. The principles of this measurement technique are discussed and field measurements were carried out at shunt rector and capacitor bank installation in two 275 kV air insulated substations. Results of the measurements are presented and discussed in this thesis. The proposed technique shows that it is relatively easy to monitor circuit breaker switching transients and useful information on switching instances can be extracted from the measured waveforms. Further research works are discussed to realise the full potential of the measuring technique.
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5

Ramli, Mohd Shamir. "Investigation of circuit breaker switching transients for shunt reactors and shunt capacitors." Queensland University of Technology, 2008. http://eprints.qut.edu.au/17822/.

Повний текст джерела
Анотація:
Switching of shunt reactors and capacitor banks is known to cause a very high rate of rise of transient recovery voltage across the circuit breaker contacts. With improvements in circuit breaker technology, modern SF6 puffer circuits have been designed with less interrupter per pole than previous generations of SF6 circuit breakers. This has caused modern circuit breakers to operate with higher voltage stress in the dielectric recovery region after current interruption. Catastrophic failures of modern SF6 circuit breakers have been reported during shunt reactor and capacitor bank de-energisation. In those cases, evidence of cumulative re-strikes has been found to be the main cause of interrupter failure. Monitoring of voltage waveforms during switching would provide information about the magnitude and frequency of small re-ignitions and re-strikes. However, measuring waveforms at a moderately high frequency require plant outages to connect equipment. In recent years, there have been increasing interests in using RF measurements in condition monitoring of switchgear. The RF measurement technique used for measuring circuit breaker inter-pole switching time during capacitor bank closing is of particular interest. In this thesis, research has been carried out to investigate switching transients produced during circuit breaker switching capacitor banks and shunt reactors using a non-intrusive measurement technique. The proposed technique measures the high frequency and low frequency voltage waveforms during switching operations without the need of an outage. The principles of this measurement technique are discussed and field measurements were carried out at shunt rector and capacitor bank installation in two 275 kV air insulated substations. Results of the measurements are presented and discussed in this thesis. The proposed technique shows that it is relatively easy to monitor circuit breaker switching transients and useful information on switching instances can be extracted from the measured waveforms. Further research works are discussed to realise the full potential of the measuring technique.
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6

Minkley, Warick. "Analysis of restricted earth fault relay application within a shunt capacitor bank design impacting on protection stability." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1021106.

Повний текст джерела
Анотація:
This research is aimed at analyzing the performance of the restricted earth fault relay used on a 400kV capacitor bank scheme used on the Eskom Transmission network. After the commissioning of two Capacitor Banks using the above mentioned scheme design the plant was energized. As a result of the energization the Shunt Capacitor Bank (SCB) then experienced spurious trips. The cause of the trips was found to be the operation of the restricted earth fault relay. In this research project, restricted earth fault protection on SCBs in the Eskom Transmission environment will be the area of interest. The proposed research will analyze the current SCB protection scheme in service specifically looking at the restricted earth fault circuit design and relay performance. An equivalent model of the SCB from primary plant perspective based on theory will be derived. Recording and analyzing of Comtrade transient waveforms respectively, when the bank is nergized, will be done in order to provide a reference base to work from. Manual alculations of various parameters from the derived model including transient inrush currents and fault currents will be performed to access applicable scheme parameters. Further calculations will include the voltage setting for the restricted earth fault relay. As a result of the analysis a recommendation will be made on a viable solution or a revised design will be put forward, based on the results, to improve the scheme’s performance. The protection scheme is used on the two 400kV 100MVAR capacitor banks 11 and 12 at Hydra Substation.
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7

Baker-Duly, Phillip William. "Shunt capacitor bank fundamentals and the application of differential voltage protection of fuseless single star earthed shunt capacitor banks." Thesis, 2010. http://hdl.handle.net/10539/7515.

Повний текст джерела
Анотація:
The research investigates reactive power compensation and protection of shunt capacitor banks. The characteristics of capacitors including, formulae, design, manufacturing, and testing is presented. Capacitor units using extended foil solder type elements have losses as low as 0.1 watt/kVAr. Failure of capacitors generally occurs due to overvoltage stress. The type and aging properties of the dielectric determines the lifespan of the capacitor. Polypropylene film is commonly used as the dielectric. Basic capacitor bank design calculations are presented. A detailed discussion on the configurations and protection philosophies is described for single star earthed, single star H-bridge, double star, and C-type filter H-bridge capacitor banks. A novel approach to unbalance voltage detection and the protection of fuseless single star earthed shunt capacitor banks is investigated, engineered and tested. This methodology explores the potential evolution towards distributed protection. This involves two programmed multifunction protection relays communicating via the IEC 61850 Ethernet protocol. One relay receives voltage measurements from the high voltage busbar. The other relay receives voltage measurements from the low voltage capacitor tap point. The two relays share their measurements via the Ethernet link. The difference in measurements is used to initiate alarm and trip operations. The relay protection function satisfies criterion for reset-ability, selectivity, stability, accuracy, and loss of potential blocking. Spurious operation occurs when the Total Harmonic Distortion level is above 8%. The major short coming is the cyclic processing of the logic function. The algorithm processing duration is 396ms as opposed to an anticipated time of 60ms. This application has a competitive overall cost advantage. This is based on the number of components required, manufacturing and testing times, and onsite installation and commissioning works. It is recommended to further investigate the cyclic processing of the logic functions, as well as, to test the protection function on a power system simulator. Future prospects involve using the programmability and flexibility of the onboard relay PLC to count capacitor element failure, on a discrete basis, instead of detection and protection based on analogue threshold settings. This will mitigate ambiguous measurements and spurious operation.
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8

Sai, Pavan Polisetty. "Fault Location in Double Wye Shunt Capacitor Banks." Thesis, 2020. https://etd.iisc.ac.in/handle/2005/4392.

Повний текст джерела
Анотація:
Shunt capacitor banks (SCBs) are usually used for providing reactive power support to power systems. Reactive power support leads to power factor correction, voltage regulation and reduction of network losses. Outage of the SCBs may affect the power system. Thus, SCBs should be well protected for efficient operation of power system. SCBs consist of many capacitor elements connected in series and parallel combinations. Failure of capacitor elements leads to cascaded failures within the SCB if left undetected. Thus, early detection of internal failures in SCBs is crucial. Double wye SCB con figuration is commonly used for reactive power support in high voltage transmission systems. Unbalance protection methods are mostly used for protecting SCBs against internal faults. Among them, neutral current unbalance methods are sensitive and are commonly used to locate the internal faults in double wye SCBs. Locating the internal faults helps in speeding up the repair process and reducing the outage time. One of the limitations of existing neutral current unbalance methods is that they fail to detect simultaneous faults. Simultaneous faults are those faults which happen at the same time or happen between two consecutive protection passes. During some simultaneous fault conditions, existing neutral based methods may misinterpret the fault condition as a healthy condition. In some other cases, one type of fault may be misinterpreted as another type of fault. The severity of fault may also be misinterpreted during simultaneous faults. Misinterpretation of fault type and severity delays the repair process. There is a need for a fault location method which overcomes the drawbacks of the existing methods. In this thesis, a novel method is proposed to detect different types of internal faults in grounded and ungrounded double wye SCBs. The proposed method detects different types of single and consecutive faults in double wye SCBs. The proposed method can also locate simultaneous faults happening in any of the two legs of the bank. This method uses compen- sated negative sequence quantity and compensated neutral currents to locate the fault. In the proposed method, compensated quantities are obtained by subtracting the pre-fault quantities from the quantities during fault. This helps in cancelling the effect of pre-fault conditions. The advantage of the proposed method compared to the existing methods is that it can lo- cate simultaneous faults. The proposed method is analyzed under different practical scenarios such as system voltage unbalances, temperature effects, switching transients, external faults and manufacturing unbalances. Severity of fault is indicated by the number of failed elements. Proposed method can also calculate the number of failed elements accurately. Simulation studies have been performed on a test system developed in PSCAD software which validates the proposed method. Fuseless ungrounded bank and grounded fuse type bank con gurations have been simulated. It has been found that the proposed method performs satisfactorily under conditions like load switching, external faults and voltage unbalance. Per- formance of the proposed method during internal faults like single faults, simultaneous faults and consecutive faults has been tested. The proposed method performs effectively even during external fault and load switching conditions. A laboratory scale test setup consisting of fuseless ungrounded SCB has been developed. It has been found that proposed method locates different fault types like single and simultaneous faults accurately. Both software and hardware results validate the successful working of the proposed method
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9

Chen, Chia-Fu, and 陳家富. "Investigation and Analysis of Switching Transientfor Shunt Capacitor Banks." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/26655365408335611015.

Повний текст джерела
Анотація:
碩士
中原大學
電機工程研究所
92
They are many complicated magnetic transient phenomena in the power system, in which the capacitor switching producing abnormal overvoltage and extremely surge current would menace the power equipments. Although many existing papers presented some methods to remedy the capacitor switching transients in the past, the capacitor accidents of switching transients still happen all the time. Some methods to improve and solve process for searching those abnormal causes in this report are provided, avoiding the similar cases happen. First, the phenomena about neural voltage imbalance caused by few capacitors burnt in the shunt capacitor unit are presented, capacitor unit overvoltage is analysed for switching off shunt capacitor bank at proper time to prevent more damages in the system. Then, common remedy processes are collected. The Taipower system was used to be a test system for illustrating the capacitor switching using MATLAB/SIMULINK. Through the remedy method collection and simulation results upon a realistic system, the accidents caused by capacitor switching can be reduced.
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10

Ntusi, M. "Optimal placement of shunt capacitor banks on a sub-transmission network /." 2009. http://hdl.handle.net/10413/963.

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Книги з теми "Shunt capacitor Banks"

1

IEEE Power Engineering Society. Power Systems Relaying Committee., Institute of Electrical and Electronics Engineers., and IEEE Standards Association, eds. IEEE guide for the protection of shunt capacitor banks. New York: Institute of Electrical and Electronics Engineers, 2000.

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2

Guide for the Protection of Shunt Capacitor Banks. IEEE Standards Office, 2000.

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3

Guide for the Protection of Shunt Capacitor Banks. IEEE Standards Office, 2000.

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4

IEEE Guide for the protection of shunt capacitor banks. New York, N.Y., USA: Institute of Electrical and Electronics Engineers, 1991.

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Частини книг з теми "Shunt capacitor Banks"

1

Nasir, Mohammad, Ali Sadollah, Eneko Osaba, and Javier Del Ser. "A Novel Metaheuristic Approach for Loss Reduction and Voltage Profile Improvement in Power Distribution Networks Based on Simultaneous Placement and Sizing of Distributed Generators and Shunt Capacitor Banks." In Lecture Notes in Computer Science, 64–76. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-62362-3_7.

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2

Eltamaly, Ali Mohamed, Osama El Sayed Morsy, Elghaffar, Yehia Sayed Mohamed, and Abou-Hashema Ahmed. "Establishing a Realistic Shunt Capacitor Bank with a Power System using PSO/ACCS." In IoT, Machine Learning and Blockchain Technologies for Renewable Energy and Modern Hybrid Power Systems, 205–34. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003360780-9.

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3

"Application of Shunt Capacitor Banks." In Power System Harmonics and Passive Filter Designs, 453–502. Hoboken, NJ, USA: John Wiley & Sons, Inc, 2015. http://dx.doi.org/10.1002/9781118887059.ch11.

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4

Masoum, Mohammad A. S., and Ewald F. Fuchs. "Optimal Placement and Sizing of Shunt Capacitor Banks in the Presence of Harmonics." In Power Quality in Power Systems and Electrical Machines, 887–959. Elsevier, 2015. http://dx.doi.org/10.1016/b978-0-12-800782-2.00010-5.

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"Optimal Placement and Sizing of Shunt Capacitor Banks in the Presence of Harmonics." In Power Quality in Power Systems and Electrical Machines, 397–441. Elsevier, 2008. http://dx.doi.org/10.1016/b978-012369536-9.50011-5.

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Fuchs, Ewald F., and Mohammad A. S. Masoum. "Optimal placement and sizing of shunt capacitor banks in the presence of harmonics." In Power Quality in Power Systems, Electrical Machines, and Power-Electronic Drives, 1017–85. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-12-817856-0.00011-x.

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7

Tamura, Y., Y. Tayama, K. Sakamoto, Y. Nakanishi, and S. Yokokawa. "POSSIBILITY OF JUMP PHENOMENA FROM OPERABLE LOAD FLOW SOLUTION TO NONOPERABLE SOLUTION BY THE IMPACT OF SWITCHING-IN OF SHUNT CAPACITOR BANKS." In Power Systems and Power Plant Control 1989, 383–88. Elsevier, 1990. http://dx.doi.org/10.1016/b978-0-08-037039-2.50070-4.

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"12 Transformer Reactor and Shunt Capacitor Bank Protection." In Power Systems Protective Relaying, 443–508. 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487–2742: CRC Press, 2017. http://dx.doi.org/10.1201/9781351228312-13.

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Тези доповідей конференцій з теми "Shunt capacitor Banks"

1

Samineni, S., C. Labuschagne, J. Pope, and B. Kasztenny. "Fault location in shunt capacitor banks." In 10th IET International Conference on Developments in Power System Protection (DPSP 2010). Managing the Change. IET, 2010. http://dx.doi.org/10.1049/cp.2010.0346.

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Jouybari-Moghaddam, H., Tarlochan Sidhu, Palak Parikh, and Ilia Voloh. "Enhanced fault location method for shunt capacitor banks." In 2017 70th Annual Conference for Protective Relay Engineers (CPRE). IEEE, 2017. http://dx.doi.org/10.1109/cpre.2017.8090021.

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Esponda, H., D. Guillen, E. Vazquez, and M. A. Andrade. "Energy modes-based differential protection for shunt capacitor banks." In 15th International Conference on Developments in Power System Protection (DPSP 2020). Institution of Engineering and Technology, 2020. http://dx.doi.org/10.1049/cp.2020.0134.

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Jouybari-Moghaddam, H., Tarlochan Sidhu, Ilia Voloh, and Mohammad Zadeh. "New method of capacitors failure detection and location in shunt capacitor banks." In 2018 71st Annual Conference for Protective Relay Engineers (CPRE). IEEE, 2018. http://dx.doi.org/10.1109/cpre.2018.8349807.

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Jouybari-Moghaddam, Hessamoddin, and Tarlochan S. Sidhu. "A study of capacitor element failures in high voltage Shunt Capacitor Banks." In 2017 IEEE 30th Canadian Conference on Electrical and Computer Engineering (CCECE). IEEE, 2017. http://dx.doi.org/10.1109/ccece.2017.7946675.

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Feng, Shunping, and Wenze Liu. "Overvoltage Simulation of Circuit Breaker Switching off Shunt Capacitor Banks." In 2011 Asia-Pacific Power and Energy Engineering Conference (APPEEC). IEEE, 2011. http://dx.doi.org/10.1109/appeec.2011.5748953.

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Ding, F. H., X. Y. Duan, J. Y. Zou, and M. F. Liao. "Controlled Switching of Shunt Capacitor Banks with Vacuum Circuit Breaker." In 2006 International Symposium on Discharges and Electrical Insulation in Vacuum. IEEE, 2006. http://dx.doi.org/10.1109/deiv.2006.357333.

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Mohanty, Rabindra, and Ashok Kumar Pradhan. "Fast and Sensitive Time-Domain Protection of Shunt Capacitor Banks." In 2021 9th IEEE International Conference on Power Systems (ICPS). IEEE, 2021. http://dx.doi.org/10.1109/icps52420.2021.9670235.

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Sithole, S., N. Mbuli, and JHC Pretorius. "Voltage regulation in the douglas area using shunt capacitor banks and controllable shunt reactors." In 2013 13th International Conference on Environment and Electrical Engineering (EEEIC). IEEE, 2013. http://dx.doi.org/10.1109/eeeic-2.2013.6737888.

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Jie, Wu, Chang Zhengwei, Luo Rongsen, and Li Shilong. "Fault Detection Approach for Shunt Capacitor Banks Based on Unbalanced Current." In 2022 IEEE 6th Conference on Energy Internet and Energy System Integration (EI2). IEEE, 2022. http://dx.doi.org/10.1109/ei256261.2022.10116168.

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