Lightning-induced voltages are one of the main causes shutdown in distribution lines. In this work, attention is focused on effects wideband modeling electric grounding overvoltage calculation along insulator strings due to indirect lightning strikes. This study done directly time-domain with being represented an equivalent circuit accounting for its dynamics. Results show that adoption commonl...

Abstract The simulation models of the 500kV gas-insulated transmission lines (GIL) and substation (GIS) systems in a realistic nuclear plant are presented paper. Very Fast Transient Overvoltage (VFTO) which is generated during switching operations, analyzed. Some affecting factors on level VFTO investigated. These location power source, entrance capacitance potential transformer (PT), capacitiv...

usually both ends of a transformer winding are at the same side of the magnetic core. with this arrangement there are automaticaly the same number of the turns for each winding in both core windows next to the middle leg of a three phase three leg core type transformer. contrary to this arrangement it is possible to put the two ends of a winding at the different sides of the core. in this case ...

this paper gives a detailed analysis of direct torque control (dtc) strategy in a five-level drive and proposes a 24-sector switching table. the overvoltage problem due to high dv/dt is reduced compared to the 12-sector dtc. using all vectors leads to better flexibility and reduces speed oscillations. simulation and experimental results for a 3kva prototype confirm the proposed solutions. a tms...

«Cahiers Techniques» is a collection of documents intended for engineers and technicians, people in the industry who are looking for more in-depth information in order to complement that given in product catalogues. Furthermore, these «Cahiers Techniques» are often considered as helpful «tools» for training courses. They provide knowledge on new technical and technological developments in the e...

Nowadays, plenty of sensitive electronic devices are installed in secondary circuits substations. When lightning strikes a substation and transmission line, currents flow into the grounding structure through shield wires surge arresters primary circuit, overvoltages induced on control cables circuit owing to effect transient ground potential rises electromagnetic coupling. Shielded one counterm...

Indirect lightning strikes hitting near photovoltaic installations are much more frequent than direct hits, and can generate overvoltage in their electric circuitry. The authors developed a method to estimate the induced on single modules. Using model of whole array also including Inter-Module Coupling Mechanisms (IMCMs), new approach full arrays is presented this paper. procedure first estimat...