In a competitive market where generating companies compete for loads with open access to the transmission network, the protection and control techniques in use take on a special significance. In this new environment there are two issues which are related to the uses of real-time measurements. First, there is the possibility that the preset control and protection decisions do not necessarily per...

Whether a disturbance will trigger unexpected protection operation to exacerbate the normal operation state or even lead to the unstable state depends on the transient energy that the system gains during the fault period. The paper presents a new gradient projection approach to calculate the critical energy for transient stability assessment of the power system with the protection operation. Th...

Power utilities are aware of the specific characteristics and requirements for their network. For this reason, they may require additional functionality from the protective devices and secondary systems included in their power network. Therefore ECEPA requires a number of specific tests to be conducted on the protection system proposed for a particular application to prove the suitability of th...

The NEPTUNE power delivery system faces several challenges in serving the needs of the oceanographic community. Two major challenges, operating the system under normal conditions and protecting it against faults, require the development of new approaches unfamiliar to power engineers. In particular, the power management system must cope with several modes of potential system instability, and th...

This paper discusses test set up and methodology which may be used for wind power plant (WPP) protection system evaluation. The test set up cosists of a digital simulator, a number of physical relays and recorders, as well as software for modeling, simulation, signal editing, etc. Correct operation of the WPP protection system is crucial during grid disturbances to prevent unwanted power source...

OVERVIEW: Paralleling the rapid penetration of the Internet and corporate intranets, protection and control system for power systems have been quick to exploit these technologies to make the remote control and monitoring of power systems more convenient. By leveraging these networking technologies to achieve a new level of openness, Hitachi, Ltd. has now succeeded in developing a protection and...

This paper presents the two basic comparison techniquesThe amplitude and phase comparisons, used in power system protection and control. Phasor diagrams were used to discuss their relationships and circuit diagrams were modeled for the description of their operations. The general expression for impedance, Mho, positive offset and negative offset Mho characteristics were developed. At a stage si...