The Experts below are selected from a list of 6507 Experts worldwide ranked by ideXlab platform
S Elangovan - One of the best experts on this subject based on the ideXlab platform.
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a b spline wavelet based Fault classification scheme for high speed protection relaying
Electric Machines and Power Systems, 2000Co-Authors: Cheng Hong, S ElangovanAbstract:This paper presents a new Fault detection and classification algorithm based on the wavelet transform. The B-spline wavelet transforms of three phase currents on transmission lines are employed. By comparing the moving average of these transforms, Fault types are classified easily. Effects of the Fault inception angle, Fault distance, and Fault Impedance are examined. Simulation studies using EMTP show that the wavelet-based algorithm is simple, effective, and robust. Without any modification, the proposed algorithm can be applied to power systems of any voltage level. It is suitable for the high-speed protection relaying.
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a wavelet multiresolution analysis approach to Fault detection and classification in transmission lines
International Journal of Electrical Power & Energy Systems, 1998Co-Authors: Jie Liang, S Elangovan, J B X DevottaAbstract:Abstract A real-time wavelet multiresolution analysis (MRA)-based Fault detection and classification algorithm is proposed in this paper. The first stage MRA detail signals extracted from the original signals are used as the criteria for this problem. By measuring the sharp variation values of the MRA detail signals, Faults in the power system can be detected. The Fault type is then identified by the comparison of the three-phase MRA sharp variations. The effects of the Fault distance, Fault inception angle and Fault Impedance are examined, and the Fault classification routine is designed to overcome their effects. Simulation results show that this algorithm is effective and robust, and it is promising in high Impedance Fault detection.
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Fault Impedance estimation algorithm for digital distance relaying
IEEE Transactions on Power Delivery, 1994Co-Authors: D L Waikar, S Elangovan, A C LiewAbstract:Fault Impedance is one of the major parameters that must be estimated accurately in digital distance relaying application. In this paper, a new algorithm is proposed based on symmetrical components theory. The proposed algorithm has computational advantage over previously suggested symmetrical components based algorithms. A procedure for applying shunt Fault conditions to the sequence equations to estimate Fault Impedance of the protected transmission line is discussed. The Alternative Transient Program (ATP) that is available on personal computers was used in evaluating the proposed algorithm. ATP models a power system and simulates many Fault conditions on a selected transmission line. Fault data obtained were used in calculating Fault Impedance using the proposed algorithm. Fault Impedance estimates were inserted in relay characteristics to determine suitability of the proposed algorithm for first zone distance protection. Sample results of these studies which show stable Fault distance estimates are presented and discussed in the paper. >
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first zone performance assessment of a symmetrical component based improved Fault Impedance estimation method
Electric Power Systems Research, 1993Co-Authors: D L Waikar, A C Liew, S ElangovanAbstract:Abstract This paper describes the first-zone performance assessment of a symmetrical component based Fault Impedance estimation method that has previously been proposed by the authors. The performance equation of the proposed method is briefly reviewed and various performance assessment techniques are also discussed. The Alternative Transient Program, which is available on personal computers, was used in these performance assessment studies. This Program was used to model a power system and to simulate many Fault conditions on a selected transmission line. Fault data thus obtained were used in calculating the Fault Impedance using the proposed method. Fault Impedance estimates were inserted in R-X plane characteristics to determine the suitability of the proposed method for first-zone digital protection. The results of these performance assessment studies are presented and discussed in the paper.
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symmetrical component based improved Fault Impedance estimation method for digital distance protection part i design aspects
Electric Power Systems Research, 1993Co-Authors: D L Waikar, S Elangovan, A C LiewAbstract:Abstract Recently, distance relays using digital processors have received considerable attention from researchers. The digital processor based distance relays use estimates of Fault Impedance (distance) in making decisions. Several methods have been suggested in the past that can be used to estimate Fault distance. Researchers have proposed symmetrical component, Clark's component and modal component theories for developing distance estimation methods. The approach used in the symmetrical component based methods has resulted in a higher computational burden on the digital processor, which was addressed using special hardware or multiprocessors. In the present paper, an improved method is proposed that also uses symmetrical component transformation. The simplified approach used in the proposed method leads to a computational advantage over previously suggested symmetrical component based methods. The paper derives performance equations that are valid for ten types of shunt Fault encountered on transmission lines. The basis for analyzing shunt Faults on the transmission line model and developing the Fault estimation method is discussed in detail. The proposed method is also validated using numerical examples, the results of which are reported in Part II of this paper ( Electr. Power Syst. Res., 26 (1993) 149–154).
Ashok Kumar Pradhan - One of the best experts on this subject based on the ideXlab platform.
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an accurate Fault location method for multi circuit series compensated transmission lines
Power and Energy Society General Meeting, 2017Co-Authors: Swaroop Gajare, Ashok Kumar PradhanAbstract:This paper presents a Fault location method for multi-circuit series compensated line using phasor data from intelligent electronic devices (IEDs) available at both ends. In case of unavailability of synchronized data, analytical synchronization is obtained using an operator. In the formulation, the method considers untransposed line sections resulting on two sides of the Fault and the distributed nature of line. For a healthy phase, currents on two sides at the Fault point are equal unlike different currents on two sides in a Faulted phase. This is checked over the line length and the Fault location is pinpointed. The method does not require the model of the series compensation placed at any location on the line and can be used for both inter and intra-circuit Faults. It also considers reactive component of the Fault Impedance for accurate Fault location. The method is tested using PSCAD/EMTDC simulations for a multi-circuit series-compensated line in Indian power grid. Evaluation study confirms the validity of the method for various Faults.
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an accurate Fault location method for multi circuit series compensated transmission lines
IEEE Transactions on Power Systems, 2017Co-Authors: Swaroop Gajare, Ashok Kumar PradhanAbstract:This paper presents a Fault location method for multi-circuit series compensated line using phasor data from intelligent electronic devices available at both ends. In case of unavailability of synchronized data, analytical synchronization is obtained using an operator. In the formulation, the method considers untransposed line sections resulting on two sides of the Fault and the distributed nature of line. For a healthy phase, currents on two sides at the Fault point are equal unlike different currents on two sides in a Faulted phase. This is checked over the line length and the Fault location is pinpointed. The method does not require the model of the series compensation placed at any location on the line and can be used for both inter- and intra-circuit Faults. It also considers reactive component of the Fault Impedance for accurate Fault location. The method is tested using PSCAD/EMTDC simulations for a multi-circuit series-compensated line in Indian power grid. Evaluation study confirms the validity of the method for various Faults.
Rong Zeng - One of the best experts on this subject based on the ideXlab platform.
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an effective emtr based high Impedance Fault location method for transmission lines
arXiv: Signal Processing, 2020Co-Authors: Chijie Zhuang, Farhad Rachidi, Rong ZengAbstract:This paper summarizes the electromagnetic time reversal (EMTR) technique for Fault location, and further numerically validates its effectiveness when the Fault Impedance is negligible. In addition, a specific EMTR model considering the Fault Impedance is derived, and the correctness of the model derivation is verified by various calculation methods. Based on this, we found that when the Fault Impedance is large, the existing EMTR methods might fail to accurately locate the Fault. We propose an EMTR method that improves the location effect of high-Impedance Faults by injecting double-ended signals simultaneously. Theoretical calculations show that this method can achieve accurate location for high-Impedance Faults. To further illustrate the effectiveness, the proposed method is compared with the existing EMTR methods and the most commonly used traveling wave-based method using wavelet transform. The simulation results show that the proposed double-ended EMTR method can effectively locate high-Impedance Faults, and it is more robust against synchronization errors compared to the traveling wave method. In addition, the proposed method does not require the knowledge or the a priori guess of the unknown Fault Impedance.
A K Sinha - One of the best experts on this subject based on the ideXlab platform.
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application of wavelet multiresolution analysis for identification and classification of Faults on transmission lines
Electric Power Systems Research, 2005Co-Authors: D Chanda, N Kishore, A K SinhaAbstract:This paper presents a new method for identification and classification of Faults based on wavelet multiresolution analysis (MRA). Daubechies eight (D-8) wavelet transforms of the three phase currents on a transmission line fed from both ends are used. The peak absolute value, the mean of the peak absolute values and summation of the 3rd level output of MRA detail signals of current in each phase extracted from the original signals are used as the criterion for the analysis. The effects of Fault distance, Fault inception angle and Fault Impedance are also examined. Extensive simulations are carried out to generate time domain input signal using EMTP (Microtran) on a 230 kV, 200 km long line fed from both ends and simulation results show that the proposed method is a simple, effective and robust method suitable for high Impedance Faults also.
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a wavelet multiresolution analysis for location of Faults on transmission lines
International Journal of Electrical Power & Energy Systems, 2003Co-Authors: D Chanda, N Kishore, A K SinhaAbstract:Faults on EHV lines are quite common. They cause disruption in power supply. Accurate location of Faults will result in faster maintenance and restoration of supply. This paper presents a new method for the location of Faults based on wavelet multiresolution analysis (MRA). EMTP (Microtran) is employed to generate the time domain input signal. Daubechies eight (D-8) wavelet transforms of the three phase currents on transmission lines from both the ends are used. The effects of Fault inception angle and Fault Impedance are examined. Extensive simulation work has been carried out and results indicate that the proposed method is very effective in locating the Fault with a high accuracy.
Swaroop Gajare - One of the best experts on this subject based on the ideXlab platform.
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an accurate Fault location method for multi circuit series compensated transmission lines
Power and Energy Society General Meeting, 2017Co-Authors: Swaroop Gajare, Ashok Kumar PradhanAbstract:This paper presents a Fault location method for multi-circuit series compensated line using phasor data from intelligent electronic devices (IEDs) available at both ends. In case of unavailability of synchronized data, analytical synchronization is obtained using an operator. In the formulation, the method considers untransposed line sections resulting on two sides of the Fault and the distributed nature of line. For a healthy phase, currents on two sides at the Fault point are equal unlike different currents on two sides in a Faulted phase. This is checked over the line length and the Fault location is pinpointed. The method does not require the model of the series compensation placed at any location on the line and can be used for both inter and intra-circuit Faults. It also considers reactive component of the Fault Impedance for accurate Fault location. The method is tested using PSCAD/EMTDC simulations for a multi-circuit series-compensated line in Indian power grid. Evaluation study confirms the validity of the method for various Faults.
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an accurate Fault location method for multi circuit series compensated transmission lines
IEEE Transactions on Power Systems, 2017Co-Authors: Swaroop Gajare, Ashok Kumar PradhanAbstract:This paper presents a Fault location method for multi-circuit series compensated line using phasor data from intelligent electronic devices available at both ends. In case of unavailability of synchronized data, analytical synchronization is obtained using an operator. In the formulation, the method considers untransposed line sections resulting on two sides of the Fault and the distributed nature of line. For a healthy phase, currents on two sides at the Fault point are equal unlike different currents on two sides in a Faulted phase. This is checked over the line length and the Fault location is pinpointed. The method does not require the model of the series compensation placed at any location on the line and can be used for both inter- and intra-circuit Faults. It also considers reactive component of the Fault Impedance for accurate Fault location. The method is tested using PSCAD/EMTDC simulations for a multi-circuit series-compensated line in Indian power grid. Evaluation study confirms the validity of the method for various Faults.
