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Digital relay is an important part of the power system and actually is based on fundamental frequency (50–60 Hz). Digital filter is applied for further processing and performs mathematical operations on sampled values. The digital signal processing (DSP) becomes more applied and used in proactive relays. Obviously, DSP is used in wide range of application (controls, radio, communications and other...
The distance protection relay measures the line voltage and line current at the relay location and evaluates the ratio between these quantities. Distance relays are widely used on transmission, and even distribution systems. Current transformers (CT) are the very important part of the power system protection. The main purpose of a CT is to transform the primary current in a high voltage power system...
This paper analyses the influence of current harmonics on protections devices connected to the power system which can cause serious problems. This paper outlines work that has been conducted to test of overcurrent relay and to identify the impacts of harmonics on distribution utility protection and control systems. The overcurrent relay REJ 525 is based on a microprocessor environment. A self-supervision...
This paper explains the possibility of implement of a model of a quadrilateral characteristic type of distance relay with the zones by using MATLAB / SIMULINK package. Sim Power System was used to present modeling of distance relay. The quadrilateral R-jX plain was created to show the trajectory of measured impedance using the distance relay. The relay identifiers the fault locations as expected....
IEC 61850 is the standard for communication substation which determines new applications of protection based on peer-to-peer communications between multifunctional protection devices (IEDs). The GOOSE messages (Generic Object Oriented Substation Event) can be used to replace the hard wired control signals exchanged between IEDs for interlocking and protection purposes. The idea is that the implementation...
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