This paper discusses application of MATLAB, programmable relays and digital simulators in modeling, developing and testing of protective relays. First, the issue of modeling of protective relays is addressed. The new MATLAB-based software capable of modeling digital relays by providing detailed models of the common components of contemporary digital relays is presented. Second, application of p...

We consider a relay channel for which the following assumptions are made : 1. The source-destination and relay-destination channels are orthogonal (frequency division relay channel) ; 2. The relay implements the decode-and-forward protocol ; 3. The source and relay implement the same channel encoder namely a convolutional encoder ; 4. They can use arbitrary and possibly different modulations. I...

Nowadays protection engineers are suffering from very complex implementations of protection system analysis due to massive quantities of inconsistent data, let alone coming from diverse intelligent electronic devices (IEDs). Thus, a novel Rough-Set-based data mining strategy has been formulated to resolve the inconsistency in a distance protective relay’s decision system (i.e. a transformed rel...

To avoid undesirable disconnection of healthy wind generators (WGs) or a wind power plant, a WG protection relay should discriminate among faults, so that it can operate instantaneously for WG, connected feeder or connection bus faults, it can operate after a delay for inter-tie or grid faults, and it can avoid operating for parallel WG or adjacent feeder faults. A WG protection relay based on ...

As one of the solution of the increase problem of the fault current in a power system, the superconducting fault current limiter (SFCL) has been noticed as the attractive device because it has no power loss in a normal time and can limit the fault current rapidly without additional device to detect the fault current. However, the introduction of the SFCL in a power distribution system affects t...

The increase in the line complexity, confi guration and the power transmitted has introduced a number of problems in relation to protection. New techniques have become necessary to tackle these problems. Firstly it has become necessary to see that lines are not unnecessarily disconnected, but at the same time shorter operating times from protective relays are demanded on faulted sections to pre...

In wireless networks, link budget can be relaxed by delivering the data using intermediate relay nodes. Although the immediate purpose of relaying is to obtain gain against path loss, it can also create spatial diversity due to the broadcast nature of the wireless medium. The objective of this work is to design and analyze relaying protocols that induce e2e cooperative diversity for ad hoc and ...

The article examines four basic theses about the ostensibly extremely high reliability of microprocessor-based relay protection (MP) touted by supporters of MP. Through detailed analysis based on many references it is shown that the basis of these theses are widespread myths, and actually MP reliability is lower than the reliability of electromechanical and electronic protective relays on discr...