The paper presents the performance of a novel distributed bus differential protection scheme, which utilizes independent multi-principle advanced protection algorithms, including differential percent slope, delta phase directional comparison, rate of change of differential (ROCOD) currents, delta phase directional comparison on neutral current differential, and a check zone to secure the electr...

This paper presents a real-time phase-domain synchronous machine model for generator protection relay testing and its real-time implementation. The model allows full protection scheme validation including split-phase differential and statorground fault protections. Space harmonics are considered through the use of modified winding function theory, which is used to represent arbitrary winding di...

A method of fault tracking for relay protection devices is presented in this paper. Fault means that after the failure devices, anomalies and warning information are obtained through data-mining technology, then, algorithm used to find cause failure. Let us take microcomputer as an example: Firstly, common symptoms prior probability causes can be collected empirical field data. Then, concept ev...

Validation and diagnosis of relay operation is very important to protection engineers in fault analysis. This paper presents development of an expert system based automated analysis solution, which performs validation and diagnosis of digital protective relay operation in great detail by analyzing data contained in various relay reports and files. In the system, forward chaining reasoning is us...

Smart Grid refers to an intelligent grid that employs modern information and telecommunication technologies to meet the challenges relating to the power delivery in the future. These challenges are due to, among others, increased use of renewable energy and power supply reliability requirements of modern digital society. In order to fully realise the Smart Grids a new kind of approach for the p...