This paper proposes a novel ultra-high-speed directional relay using the wavelet transform. Two relay signals indicating traveling direction are composed of fault-induced voltage and current waves propagating along EHV/UHV transmission lines. Wavelet transform technique is employed to extract transient components from the relaying signals, and represent the transient component magnitude with wa...

Lightning protection system (LPS) for wind power generation has become an important public issue due to greatly increasing installations of wind turbines (WTs) worldwide. Grounding system is one of the most important components required for appropriate LPS for WTs. Although the finite-difference time-domain (FDTD) method for solving Maxwell`s equations is difficult for computing earth potential...

-This paper considers fault location and analytical synchronization of two-end measurements functions as embedded into a current differential protective relay. As a result of that, incomplete two-end measurements, i.e. three-phase currents measured at both line ends, while three-phase voltage only from only one end are considered for processing. Fault location and synchronization formulae are d...

Ferroresonance is a complex non-linear electrical phenomenon that can make thermal and dielectric problems to the electric power equipment. Ferroresonance causes overcurrents and overvoltages which is dangerous for electrical equipment. In this paper, ferroresonance investigation will be carried out for the 33kV/110V VT at PMU Kota Kemuning, Malaysia using ATP-EMTP simulation. Different precond...

This paper describes new design of a digital simulator for relay testing. The main simulator feature is its capability to operate in both real-time and open-loop modes. In the real-time mode, the modeling software used is the Real Time System (RTS) developed by Texas A&M University. In the open-loop mode, a standard Electromagnetic Transient Program (EMTP) is used. A common Graphical User Inter...

Methodology for parameterization of voltage transformer model was developed. Verification the is carried out by comparing nameplate data with results computer calculations. The magnetization branch parameters are determined values, such as current and residual transformer’s magnetic circuit. In conclusion error angular estimated in terms amplitude values root-mean-square curve type «NOL-SECH-20...

In the operation of broadcasting transmitter, during a lightning storm, comes to frequent surge arrester failures in switchgear transmitter and along 10 kV supply cable (surge arresters section boxes). Analysis strokes is given paper. EMTP simulation loading was conducted. The energy overload due flash with more than one or flashes short time. Recommendations were also for improvement existing ...

The paper describes an integrated calculation methodology which, by simulating railway traffic, allows analysis of the performance of 2x25 kV 50 Hz electric traction systems. This methodology performs a multiconductor electrical analysis of the traction circuit utilising ATP-EMTP software (Alternative Transient Program-Electromagnetic Transient Program) and therefore additionally allows calcula...

This paper describes a procedure for frequency dependent modeling of power transformers from measured terminal characteristics. The admittance matrix is measured in the frequency domain using a network analyzer and a dedicated measurement setup. Subsequent approximation of the admittance matrix with rational functions using Vector Fitting gives an EMTP-type compatible model suitable for transie...

This paper proposes a static synchronous series compensator based on H-bridge inverter modules. Dynamic response of proposed system was analyzed by EMTP simulation, assuming that it is inserted in the 154-kV transmission line of one-machine-infinite-bus power system. The proposed system consists of 6 H-bridge inverter modules per phase, which generate 13 pulses for each half period of power fre...