【正文】 152 Issue 3, p390, 7p, 8 charts, 1 diagram, 3 graphsPower system probabilistic security assessment using Bayes classifierKeywords: Bayes classifier。 Transient stability。 Security assessmentAbstract: This paper presents a method for power system security assessment based on the Bayes classifier. This method can be applied to calculate probabilistic security indices as well as online security assessment. In general, the determination of security breach is a cumbersome and timeconsuming process due to dynamic and steadystate effects. These effects can be incorporated by considering transient stability, satisfaction of system load without violation of constraints, and voltage stability studies. The variation of the system load, as well as contingencies, may cause system transition to a different operating state. It is impractical if not impossible to evaluate all these situations, such as contingencies resulting from load variation. The straightforward Monte Carlo simulation, one of the possible methods in power system reliability analysis, requires the evaluation of a system operating state for each sampled state and is putationintensive. In the proposed method, first the joint probability density of feature vectors has been obtained by using some training data. Once this joint distribution is obtained, the Bayes classifier provides the assessment of system security without plicated contingency analyses and can reduce the putational burden. Security status of a given feature vector can be determined by a posteriori probability rule called Bayes rule, which can be implemented in online security assessment or power system reliability studies.Source: Electric Power Systems Research。 Apr2005, Vol. 74 Issue 1, p157, 9pImproving Reliability of Complex Power SystemsKeywords: ELECTRIC power failures。 ELECTRIC power systems。 MANAGEMENT。 INDUSTRIAL equipment。 RELIABILITY (Engineering)。 MEAN time between failureAbstract:Even though the power system has bee more plex, high reliability can still be achieved. By minimizing ponent count you can improve your failure rate and achieve a high calculated MTBF. By providing effective power management, you can implement features that improve the overall equipment reliability. Remember that reliability is much more than just MTBF, and carry out thorough qualification testing of your power system to ensure it fully meets equipment requirements under all conditions.Source: Canadian Electronics。 Mar2005, Vol. 20 Issue 2, p18, 2p, 1 diagramProtection issues during system restorationKeywords: Electric power system protection。 Electric power system interconnection。 Electric lines。 Relay protection。 Electric fault currents。 Electric potential。 Electric currentsAbstract:Power system blackouts are a very rare phenomenon in a wellplanned interconnected power system. Nevertheless it is very important to have plans and systems in place to handle any eventuality even if it is remote. This report brings out various issues related to protection during a system restoration process. Power system protection is critical to a safe, efficient, and reliable power system. Protection engineers take every possible care to ensure that protection systems are designed considering all predictable eventualities and these constraints have grown over time. However, during system restoration, after a major blackout, it is possible for the protection elements to be presented with situations, which they can mistake for an unhealthy power system and the protection elements may operate. The prime concern during a power system blackout is to bring the system back to normalcy as fast as possible. At times, if proper care is not taken, the protection system can hinder and delay the restoration of the power system. This report discusses various such conditions that can occur during the blackstart of a power system and also suggests solutions to manage them without promising the objectives of protection system ., to ensure a safe, efficient, and reliable power system. Source: IEEE Transactions on Power Delivery, v 20, n 1, January, 2005, p 4756A PMU based special protection scheme: A case study of Taiwan power systemKeywords: Electric power systems。 Electric generators。 Electric lines。 Control systems。 Real time systems。 Data acquisition。 Algorithms。 Computer simulationAbstract:This paper proposes a special protection scheme to prevent power system blackout due to a sequence of relay trip events based on phasor measurement units (PMUs). In a control center, we use PMU39。s to monitor the generators and the major EHV transmission lines of a power system, and apply an instability prediction algorithm for initiating a special protection schemes (SPS) to avoid a sequence of relay trip events whenever necessary. When a fault happens, we group the generators swinging coherently and reduce the system to OneMachineInfiniteBus (OMIB) system. The remedial control actions consist of load shedding and generation tripping. The strategy for determining the amount of remedial control actions is a proposed relay setting limited equalarea criterion for OMIB. A case study of Taiwan power system assumed to be equipped with proposed special protection scheme is conducted. Encouraging results are obtained. Source: International Journal of Electrical Power and Energy Systems, v 27, n 3, March, 2005, p 215223Research on capacitance current pensation based differential current protection for high voltage power cableKeywords: Electric cables。 Electric power system protection。 Electric relays。 Capacitance。 Transients。 Sensitivity analysis。 Parameter estimation。 Engineering research。 ReliabilityAbstract:The high voltage power cable possesses large distributed capacitance that brings adverse impact to protective relaying, so it must be considered in the configuration of protective devices for power cable. Utilizing the alternative transients program (ATP), the