This paper reports on the propagation of lightning overvoltage in a high-voltage direct current (HVDC) meshed grid. Since several topologies grids have been elaborated last decade, we used common comprehensive reference test platform. The impulse was investigated with regard to impact surge arresters and polarity stroke concerning DC line (±500 kV). Various scenarios were considered, including ...

The operation of parallel surge arresters can improve energy absorption capability if the are similar and installed close to each other. However, it has been reported that any small difference in individual V-I characteristics lead unbalance current sharing. When some distance away from other, travelling wave effects modify effectiveness for overvoltage protection and, this case, detailed simul...

-This paper describes a wireless data acquisition system for monitoring electrical substations. The proposed system consists of a Wireless Local Area Network (WLAN – IEEE 802.11b/g) transmitter module equipped with a data acquisition system, having current and voltage sensors, a solar power supply with battery energy storage, and a receiver module connected to a remote controller for data proce...

This work involves a basic research program that will ultimately enable new solar technology for a highly efficient and low cost water splitting system. The system consists of a unique tandem cell where the sunlight is first incident upon a photocathode, and light transmitted through the photocathode is absorbed in the photoanode. The photocathode generates two electrons per absorbed photon thr...

A contactless power transfer system for charging electric vehicles requires a high efficiency, a large air gap, and a good tolerance to lateral misalignment and needs to be compact and lightweight. A double-sided winding 10 kW transformer based on a 1.5 kW H-shaped core transformer was developed for a rapid charger. Even though the transformer capacity was increased, the dimensions of the 10 kW...

Renewable energies are increasingly integrated in electric distribution networks and will cause severe overvoltage issues. Smart grid technologies make it possible to use coordinated control to mitigate the overvoltage issues and the optimal power flow (OPF) method is proven to be efficient in the applications such as curtailment management and reactive power control. Nonconvex nature of the OP...

Monitoring of winding faults is the most important item used to determine the maintenance status of a transformer. Commonly used methods for winding-fault diagnosis require the transformer to exit operation before testing and an external exciting signal, whether the transformer is malfunctioning or not. However, if an overvoltage signal can be regarded as a broadband excitation source for fault...

When the ultra high voltage (UHV) substation used the gas insulated switchgear (GIS) system to switch lines with capacitive current, the pre-breakdown and multiple reignition will occur between switching contacts. Because of discharge characteristics of SF6 and special structures of GIS system, the variations of the electromagnetic transient process and very fast transient overvoltage (VFTO) ar...

The lightning performance of an overhead Multiconductor Transmission Line (MTL) system is typically represented by means of curves reporting how many lightning faults per year the system may experience as a function of its insulation level [1]. In other words, it expresses the probability that the lines are subject to an overvoltage greater than their critical flashover voltage (CFO). Such curv...