Ault Currents News Today : Breaking News, Live Updates & Top Stories | Vimarsana

The recloser-fuse coordination of the distribution networks equipped with distributed generators (DGs) may be jeopardized by using the conventional overcurrent protection strategies thus degrading the network reliability. This research article focuses on the design of a protection coordination strategy based on the dual-setting directional recloser (DSDR) for the effective implementation of a fuse-saving scheme in distribution networks (DNs). The proposed DSDR-based protection strategy will assist the network operators by providing a flexible coordination range along with more accurate protect...

Despite the substantial reliability and power quality improvements, the proliferation of distributed energy resources (DERs) can introduce many protection complexities in distribution networks. This research article presents a comprehensive investigative analysis of the distributed generation (DG) impacts on the protection performance of the distribution network. Various protection coordination case studies have been analyzed under different operating conditions by varying the DG penetration level or the fault conditions to highlight the potential risks of the protection networks. The severity...

Abstract Large fault currents in a synchronous-based distributed generator (SBDG) can cause serious damage to the core and windings of the generator. This paper proposes an adaptive grounding scheme to limit the ground fault currents to a safe level. To do so, a high impedance grounding configuration is designed to operate during the grid-connected mode to minimize damage to the generator during ground faults. An electronic switching mechanism is provided to identify the islanded mode of operation. This switching operation strategy will modify the grounding system to the low-impedance configu...

Abstract This research article focuses on the indeterminate protection challenge of the sensitivity deterioration (SD) (also known as protection blindness) of the overcurrent protection (OCP) devices due to the large-scale integration of distributed energy resources (DERs) in the unbalanced distribution networks (DNs). The protection blindness of the OCP has been demonstrated through novel mathematical formulations to quantify the percentage of the sensitivity deterioration for different types of distributed generation (DGs) units and for the varying DG penetration levels. Furthermore, this i...

Abstract This paper proposes the use of a novel saturated amorphous alloy core-based fault current limiter (SAACFCL) to improve the LVRT capability of doubly-fed induction generator (DFIG) based wind energy systems, especially during voltage sag events. Compared to the traditional cores which are widely used in fault current limiter (FCL), amorphous alloy core possesses a very narrow B-H loop which indicates that the SAACFCL requires a smaller dc excitation current, and it will incur low core losses. Under normal conditions, this developed SAACFCL accomplishes low impedance and has a negligib...