The paper investigates the behavior of four transformer models in electromagnetic transients programs (EMTP) when calculating inrush currents due to shell-type transformers energization. These models are single-phase Saturable Transformer (STC), BCTRAN, Hybrid Transformer (XFMR) and UMEC. The measurements of a real transformer energization performed by EDF in France are used to evaluate the acc...

To appropriately infer the correlation between lightning events and flashovers/voltage dips on real distribution networks, data coming from lightning location systems are certainly needed, but need to complemented on the one hand by data coming from distributed measurement systems able to record both protection manoeuvres and lightning-originated transients, and on the other hand by accurate ca...

-This paper presents an algorithm for locating faults on two-terminal power transmission lines. Unsynchronized twoend voltages and currents are processed in the algorithm for determining the distance to fault and the synchronization angle. The calculations are performed initially for the lumped model of the transmission line. Then, these results are used as the initial data for the Newton-Raphs...

SUMMARY Dynamic phasor modeling technique is mostly applied on power electronics devices. In this paper, application of the dynamic phasor modeling technique is extended to other major power system components. Starting from the detailed time-domain models, the dynamic phasor models for these components are derived and implemented. Further, an efficiency and accuracy comparison of the dynamic ph...

This paper describes and validates transient stability and power flow model of a Unified Power Flow Controller (UPFC), and presents a detailed comparison of different controls strategies, proposing novel, efficient and simple controls for this controller. The proposed model accurately represents the behavior of the controller in quasi-steady state operating conditions, and hence is adequate for...

The conventional reclosing of a distribution system is performed after a fixed dead time. However, it may lead to the increased outage time due to delayed reclosing. To solve this problem, this paper proposes a new adaptive reclosing scheme. The electrostatic induction is analyzed under at during-fault and post-fault conditions. Based on this analysis, the method to judge the fault clearance us...

An algorithm for locating faults on series-compensated transmission lines is presented. Use of two-end synchronized measurements of currents accomplished by current differential protective relays with additional incorporation of the locally measured three-phase voltage is considered. In case of double-circuit lines also providing of zero-sequence currents from the healthy parallel line is assum...

This paper is concentrated on the optimization of equivalent reduced networks for power system relaying purposes. For the parameter identification of reduced networks in time domain the EMTP program is applied. Moreover, the sensitiveness criterion has been used for the optimum choice of reduced network parameters. The accurate model is based on the precise representation of the transmission li...

The torsional stress is caused by interaction between electrical transient air-gap torque by electrical disturbances and mechanical torque of turbine-generator shaft system. If a transient shaft torque exceeds a certain threshold, the loss of fatigue life occurs and in the end it is possible to happen shaft failure. This paper discusses that which factors can damage to turbine-generator shaft a...