Fault Location Algorithm for Multi-Terminal Radial Medium Voltage DC Microgrid

Accurately locating the fault helps in the rapid restoration of the isolated line back into the system. This article proposes a novel communication-based multi-terminal method to locate the fault in a radial medium voltage DC (MVDC) microgrid. A time-domain based algorithm is proposed which applies to an MVDC system with different possible...

Cyber Attacks on Power System Automation and Protection and Impact Analysis

Power system automation and communication standards are spearheading the power system transition towards a smart grid. IEC 61850 is one such standard, which is widely used for substation automation and protection. It enables real-time communication and data exchange between critical substation automation and protection devices within digital...

High Impedance Fault Detection using Advanced Distortion Detection Technique

A High Impedance Fault (HIF) in the power distribution systems remains mostly undetected by conventional protection schemes due to low fault currents. Apart from degrading the reliability of power supply to customers, HIF can impose a high cost on the utilities due to technical damages. The nonlinear and asymmetric nature of HIF makes its...

Distance Protection Challenges in a Wind Farm

Wind farms are currently built in the North Sea in the Netherlands. The grid connecting the off-shore wind farm to the main-land distribution grid must be protected against short-circuits and other electrical disturbances. In this project is studied if electrical protection of a grid is suitable for grids connecting renewable energy sources to...

Testing of Fast Transfer Relay by an EMTP-based Approach

Industries such as chemical companies need a continuous power supply and the fast transfer relay Siemens 7uv68 is designed to transfer frompresent feederwhich encounters a fault to an auxiliary feeder and minimizes the transient torque of the induction motors during transfer. The relay will be installed in a DOW power plant in South Tarragona,...

Improved Grid Reliability by Robust Distortion Detection and Classification Algorithm

Deviations from normal power grid operations, such as incipient faults, equipment damage, or weather related effects, have characteristic signatures in the current and voltage waveforms. Detecting and classifying such signal distortions as quick as possible can contribute to grid reliability since grid events can be responded to in time, i.e....

High Impedance Fault Detection in Real-Time and Evaluation Using Hardware-In-Loop Testing

High Impedance Fault (HIF) is a low fault current event which cannot always be efficiently detected or cleared by conventional protection systems. Voltage or current signal distortions are often a possible indicator of HIF signatures which need to be carefully analyzed. This paper proposes a new technique based on second-difference approach to...

3D Nonlinear transies field-circuit modeling of inductive fault current limiters

Due to increasing levels of fault currents, Fault Current Limiters (FCLs) are expected to play an important role in the protection of future power grids. Inductive saturable FCLs are particularly interesting due to their inherent reaction on the fault. Many different configurations have been proposed in literature. Being difficult or impossible...

Analysis of Protection Relay Malfunctioning in Medium Voltage Grids

The electrical power system generates and supplies electric energy to consumers and it must operate in a safe manner at all times. Despite its good performance, disturbances such as the occurrence of short circuits can always take place. Because short circuits cannot be prevented, the system must be able to recognize them and take corrective...

Transient stability analysis of a distribution network with distributed generators

This letter describes the transient stability analysis of a 10-kV distribution network with wind generators, microturbines, and CHP plants. The network being modeled in Matlab/Simulink takes into account detailed dynamic models of the generators. Fault simulations at various locations are investigated. For the studied cases, the critical...

Directional relay co-ordination in ungrounded radial distribution networks using a Real-Time Digital Simulator