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the sequence and super-imposed signals are used to detect the remote circuit breaker operation, from which whether a fault is inside the pro- tected section can be derived. Extensive simulation studies with respect to typical double circuit transmission line systems show that the pro- posed technique is able to fast and correctly determine whether a fault is inside the protected line section without the need for communication links. Keywords: Double circuit lines, non-communication protection. Preprint Order Number: PE-065PRD (04-2002) Discussion Deadline: September 2002 A Novel Fault Detection Techique of High Impedance Arcing Faults in Transmission Lines Using the Wavelet Transform Kim, C.H.; Kim, H.; Ko, YH.; Byun, S.H.; Aggrawal, R.K.; Johns, A.T Author Affiliation: Sungkyunkwan University, Suwoncity, Korea; University of Bath, Bath, U.K. Abstract: This paper describes a novel fault detection technique of high impedance faults (HIFs) in high voltage transmission lines using the wavelet transform. Recently, the wavelet transform (WT) has been successfully applied in many fields. The technique is based on utilising the absolute sum value of coefficients in multiresolution signal decom- position (MSD) based on the discrete wavelet transform (DWT). A fault indicator and fault criteria are then used to detect the HIF in trans- mission line. In order to discriminate between HIF and non-fault tran- sient phenomena such as capacitor and line switching and arc furnace loads, the concept of duration time, i.e. the transient time period, is pre- sented. On the basis of extensive investigations, optimal mother wave- lets for the detection of HIF are chosen. It is shown that the technique developed is robust to fault type, fault-inception angle, fault resistance and fault location. The paper demonstrates a new concept and method- ology in HIT in transmission lines. The performance of the proposed technique is tested under a variety of fault conditions on a typical 154kV Korean transmission line system. Keywords: Fault detection, high impedance arcing fault, transmis- sion lines, wavelet transform. Preprint Order Number: PE-009PRD (04-2002) Discussion Deadline: September 2002 A Novel Adaptive PMU Based Transmission Line Relay: Design and EMTP Simulation Results Jiang, J.A.; Liu, C.W; Chen, C.S. Author Affiliation: National Taiwan University, Taipei, Taiwan Abstract: This paper proposes a novel adaptive relaying scheme based on Phasor Measurement Units (PMUs) for transmission lines. The proposed adaptive relaying scheme can provide an extremely accu- rate discrimination between in-zone and out-of-zone faults. Two novel and composite fault discrimination indices in terms of Clarke compo- nents of synchronized voltage and current phasors at two ends of a line are derived. A line parameter estimation algorithm is developed and built in the new designed relay to solve the uncertainty problem of line parameters. The proposed relaying scheme is independent of fault types, fault locations, fault path resistance, fault inception angles, and the variations of source impedance. The tripping decision time of the designed relay is very fast and is almost held well within 6 milliseconds for most fault events. All the EMTP simulation results show that the proposed adaptive relaying scheme provides a high level of dependabil- ity and security. Keywords: Adaptive relaying, global positioning system (GPS), line relaying, phasor measurement unit (PMU). Preprint Order Number: PE-039PRD (04-2002) Discussion Deadline: September 2002 Surge Protection Dev'ices Diagnostic Methods in Revealing Internal Moisture in Polymer Housed Metal Oxide Surge Arresters Lahti, K.; Kannus, K.; Nousianen, K. Author Affiliation: Tampere University of Technology Abstract: Diagnostic measurements performed for surge arresters are normally studied by evaluating their suitability to detect ageing and degradation of metal oxide material. The suitability of different meth- ods for revealing intemal moisture in arresters has not been studied much. This aspect is considered in the paper based on measurement re- sults obtained during a 1.5 year laboratory test series conducted for six different types of polymer housed distribution class arresters. AC power losses, third harmonic content of resistive leakage current, DC leakage current and partial discharge measurement results over the test period are given and discussed. Details of the measurement procedures suitable for measuring polymeric arresters with intemal moisture are also studied. AC power loss and DC leakage current measurements were found to be good methods, while the other two can only be used as additional methods when diagnosing intemal moisture in polymer housed arresters. Keywords: Arresters, degradation, insulation, leak detection, mois- ture, partial discharges, polymers. Preprint Order Number: PE-784PRD (04-2002) Discussion Deadline: September 2002 Transmission and Distribution Power Quality Disturbance Data Compression, Detection, and Classification Using Integrated Spline Wavelet and S-Transform Dash, PK.; Panda, G.; Sahoo, D.K.; Panigrahi, B.K. Author Affiliation: Multimedia University; National Institute of Technology, India Abstract: In this paper power quality transient data are compressed and stored for analysis and classification purpose. From the com- pressed data set origtnal data are reconstructed and then analysed using a modified wavelet transform known as transform. Compression tech- niques using splines are performed through signal decomposition, thresholding of wavelet transform coefficients, and signal reconstruc- tion. Finally we present compression results using splines and examine the application of splines compression in power quality monitoring to mitigate against data communication and data storage problems. Since Stransform has better time frequency and localisation property. power quality disturbances are detected and then classified in a superior way than the recently used wavelet transform. Keywords: power quality, data compression, spline wavelets, S-Transforms, pattern classification. Preprint Order Number: PE-675PRD (04-2002) Discussion Deadline: September 2002 An Efficient Simulated Annealing Algorithm for Network Reconfiguration in Large-Scale Distribution Systems Jeon, Y.J.; Kim, J.C.; Kim, J.O.; Lee, K.Y; Shin, J.R. Author Affiliation: Soongsil University; Hanyang University; Konkuk University; Pensylvania State University Abstract: This paper presents an efficient algorithm for loss minimization by using an automatic switching operation in large-scale distribution systems. Simulated annealing is particularly well suited for a large combinatorial optimization problem since it can avoid local IEEE Power Engineering Review, July 2002 61
