An appropriate method for fault identification and classification on extra high voltage transmission line using discrete wavelet transform is proposed in this paper. The sharp variations of the generated short circuit transient signals which are recorded at the sending end of the transmission line are adopted to identify the fault. The threshold values involve fault classification and these are...

This paper deals with the application of artificial neural networks (ANNs) to the fault detection and location in extra high voltage (EHV) transmission lines for high speed protection using one terminal line. The neural fault detector and locators have been trained with different sets of data available from a selected power network model and simulating different fault scenarios (fault types, fa...

Equine herpesvirus type 1 (EHV-1) causes respiratory disorders and abortion in equids while EHV-1 regularly causes equine herpesvirus myeloencephalopathy (EHM), a stroke-like syndrome following endothelial cell infection in horses. Both EHV-1 and EHV-9 infections of non-definitive hosts often result in neuronal infection and high case fatality rates. Hence, EHV-1 and EHV-9 are somewhat unusual ...

Abstract The EHV transformer is one of the core transmission equipment China’s EHV/UHV system, and its reliability directly affects operational stability power grid. In long-term operation process, affected by sudden short-circuit, resonance, aging, it will produce faults such as loose winding, iron core, inverted discharge, shim block shedding. Most methods for fault diagnosis need off-line mo...

Phase shift transformers (PST) are a special type of used to regulate active and reactive power on 3-phase transmission networks by adjusting the difference voltage phase angle between system nodes. Problems related flow stability, particularly stability issues, important at extra high (EHV) ultra (UHV) levels due their extreme sensitivity changes. Several studies investigated these problems us...

EQUINE herpesvirus type 1 (EHV-1) is a major equine pathogen, responsible for well-documented syndromes of respiratory disease, abortion, neonatal foal death and myeloencephalopathy (Van Maanen 2002). Recent outbreaks at racetracks, riding schools and veterinary hospitals have provided ample documentation of the contagiousness of EHV-1 and highlight the importance of early detection (Kohn and o...

This paper presents a technique for diagnosis of the type of fault and the faulty phase on overhead transmission line. The proposed method is based on the multiresolution S-transform and Parseval’s theorem. S-transform is used to produce instantaneous frequency vectors of the voltage signals of the three phases, and then the energies of these vectors, based on the Parseval’s theorem, are utiliz...

Successful operation of entire power system depends to a considerable extent on efficient and satisfactory performance of substations. Hence substations in general can be considered as heart of overall power system. In any substation, a well designed grounding plays an important role. Since absence of safe and effective grounding system can result in mal-operation or non-operation of control an...

This research aims to provide a suitable method analyze high-frequency electromagnetic scattering from extra-high voltage (EHV) transmission line towers with different tower types using characteristic mode theory (CMT). Different the traditional idea of passive protection based on spatial avoidance, this combines existing and CMT modal decomposition decompose total responses into superposition ...