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落札合計金額： 0 円（税込）. 本日終了 ウォッチ. Click here to Download. Verified Supplier. View Complete Details. Feeder Pillars. These pillars are used as cabinet for electrical equipment and an effective electrical enclosure for providing electrical services in low voltage electrical distribution applications.

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Already have an account? Sign in here. TEION KOGAKU Journal of Cryogenics and Superconductivity Society of Japan. Online ISSN : Print ISSN : ISSN-L : Journal home All issues About the journal. Focused Reviews. Masaru TOMITA Author information. Masaru TOMITA Railway Technical Research Institute.

Corresponding author. Keywords: direct-current superconductivity cable , electric railway , feeder system , energy saving , Bi tape.

 

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Do not bend or pull the cable of the Clamp sensor. KEW supports: Single-phase 2-wire (4-system), Single-phase 3-wire Capacity of free space FEED MECHANISM COMPONENTS. 3. 7 BED COVER LEFT. 1. 8 BED COVER RIGHT. 1. 9 SMTP PK57 TRANSFER CABLE ASM Free Standing Three Phase Electrical Feeder Pillar Panel A downloadable specification form is available to initiate the electrical engineering design of.

 
 

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To browse Academia. Skip to main content. By using our site, you agree to our collection of information through the use of cookies. To learn more, view our Privacy Policy. Log In Sign Up. Download Free PDF. Lilik J Awalin. Download PDF. A short summary of this paper. Shamsudin, A. Abdul Latiff, N. Abas H. Mokhlis, L. This is due to the database and impedance based method is utilized in distribution fact that distribution systems are operated in radial system to locate fault which may occur in any possible fault configuration and are often fed by a single supply.

When a sections and to optimize the switching operations to reduce the fault occurs at any location along the feeder or at the laterals outage time affected by fault. This work along the main feeder or at the laterals connected to the feeder attempt to combine fault section identification with impedance will experience a power outage.

The result which is the fault location result utilities. Generally, the method can be divided into 3 categories, which are travelling wave [1], knowledge-based is obtained through the complete process which involves the and impedance-based. The comparison is made GPS and high-speed data acquisition device used for the through proposed algorithm with actual data acquired from the installation [2].

For knowledge-based method, large utility board. Final outcome of the proposed algorithm shows consumption of time is used in the training process that good approximation on fault location. In impedance-based method, the acquisition of rms current and Keywords-three phase fault location algorithm, distribution voltage with lumped model parameters is utilized to locate system, database formation, distances calculation.

Instead of other methods, this method contributes to major advantage of simplicity, I. Electrical distribution system is an important A few restrictions should be taken into account mainly on infrastructure which highly contributes to Malaysia economic fault resistance, fault location, source impedances, and the growth. Therefore any abnormal connectivity in distribution line and load modelling [3, 4].

Nevertheless, the natures of its system can lead to a major disaster. Fault in distribution significant dependence on a configuration of distribution system can accidentally or intentionally occurs when system and model parameters lead to problem for method distribution system having relatively low impedance between used [4]. Whenever fault occurs, high This paper is organized as follows. In section II, the initial fault current will flow through the fault path resulting modelled distribution network is tested by using commercial voltage drop along the power grid system.

High fault current available simulation software. Section III discusses on how can damage transformer and cables in the power system and the hybrid method is constructed. Analysis of simulation that can caused power failure on affected feeder. It means that results and conclusion are discussed in section IV and V the system should be well protected to ensure the reliability respectively.

Such problems could II. The quickly. A fast fault location is also very important in tested feeder is divided into 3 lateral branches and connected distribution systems because the faults in the distribution to load with non homogeneous type of cable. The one line diagram of the tested network is shown in Fig. For generating results from simulation, three phase fault with zero fault impedance is firstly created on nodes and lines.

From that, the value of harmonic components of inflow current and voltage through the circuit breaker during fault occurrences will be captured. Flowchart of proposed algorithm B. Database Ranking Voltage sag magnitude and phase angle are assumed as a Fig. This assumption can be done for a short distance cables. To rank III. Database Matching the measured sending and receiving voltage sags and the The three phase fault algorithm is established by the listed possible sections obtainable in database matching process illustrated in a sequence of flowchart as shown in Fig.

Formulation of dk is fundamentally formulated from 2. The fault algorithm is based on database approach and trigonometric equation as follow; impedance based method. The graph voltage sag versus voltage sag magnitudes of Database approach is mainly aim on providing the the network is illustrates in Fig. The shortest distance, dk potential faulted section due to an exact fault occurred at for all possible faulted sections will be compared using this vague location on distribution network.

This approach is process. The least distance between the measured voltage sag obtainable from comparison of measured voltage at main and the selected section is selected as the highest possible substation along with an acquisition of voltage sag database fault section.

The second minimum will be the second as stated in the following condition; possible section and the process is repeated for another possible fault sections.

The following Fig. The method starts from the measurement of V2 and I2, followed by obtaining the voltage drop via the branch admittance on Fig. If fault occurred at other nodes after bus y Due To Fault Occurrences F under any circumstances, the process will restart and rise up continuously to an actual node determination before faulty C. Distance Estimation node. The equation can be found in equation 11 and As for the fault distance, impedance based method proposed by Adly A.

Girgis [7] is used. This method utilized single measurement of voltage and current, which is formerly known as one-ended terminal at node prior to fault as displayed in Fig. The distance is developed from single line to ground fault type. For instance, section overlapped with sections , , , 15 along mainline 1. Table I indicates the simulation results on six Icomp is Compensating current A differences tested nodes, whereby each node generates either Ispf, Ibpf is Pre-fault current at phase a, b and c A one or multiple possible faulted sections depending on the Ia, Ib is Fault current at phase a, b and c A voltage sag profile.

Then, the ranking estimation formula is Va is Fault voltage at phase a V applied with priority being given to the lowest value of dk as Vb is Fault voltage at phase b V the first rank. This enables reducing IV. Voltage Sag Profile the faulted feeder or sectionalized switching. Multiple possibilities of faulted section are generated at tested nodes of An identification of possible faulted section can be , , , and based on voltage sag pattern at Fig.

It is constructed based on fault occurrences In order to determine the performance and accuracy of the created on all nodes and lines. Different pattern of voltage sag for main feeder 1, branch 1, branch 2 and branch 3 are illustrated from The fault distance and its percentage of error are display in the graph plotted in Figure 4. The magnitude and phase column 5 and 7 respectively. It can be seen that for the fault angle of voltage sag increases gradually from the nearest section from node 4 to node 5, the actual distance is 0.

The magnitude and angle of nodes 3 and 4 distance of fault location is 0. It is also shows the experiences shallow voltage sag on account of the adjacent percentage error of the calculated fault distance over the location to the main nodes. The potential faulted section in the network can be determined from the voltage sag pattern.

For instance, nodes 3 and 4 are alone and non-overlapping with another section. Due to that, only one possible faulted section is selected. Ranking Performance 0. Based on the ranking performed, most of the faulted nodes and lines appear in the Fig. As shown in fig. In the meantime, the tested sections such as shorted actual distance is approximately 0. The error voltage sag independency. For section 7- 8, the error percentage gradually increases from 0. The error percentage for both sections crosses at 0.

Then, error percentage for section gradually increases higher than section with 0. Consequently, the fault location distance plays a major influence in the error percentage of the fault distance.

The increased in distance from main feeder changes causes the error percentage. In addition, other factors that contribute to the error percentage are due to the tapped load estimation, non-homogeneity of cables configuration mainly at feeder 2 and small computation errors.

Faulted Lines Table II shows the test outcome of three phase fault on six different lines. The fault is applied at the midpoint of each section in the network. Ranking results of tested lines is similar with tested nodes describes at Fig. Although the calculated distance on the node line , , , , and is not equal with the actual fault location, the dissimilarity is approximated. Error Percentage of distance generated at section and V. This algorithm only requires pre-fault and during fault in rms value of voltage and current at fundamental frequency before faulted point.

Since this method only uses information from the measurement node, this algorithm can be considered as more simple and economical than the other fault location methods. Mokhlis, A. Bakar, D. CIRED Related Papers. Improved fault location on distribution network based on multiple measurements of voltage sags pattern. By Hazlie Mokhlis.