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Several countries are encouraging the installation of distributed generation units with great success. The connection of these units to the existing electrical system gives rise to new challenges relating to the operation of the electrical system and operation of the protection. Thus, several recent studies suggest techniques to define the best protection settings to ensure coordination and selectivity...
The reliable operation of protection systems depends on the correct settings of protective devices. The complexity of power networks and the large number of protection setting parameters make it extremely challenging to comprehensively validate the settings. This paper presents the design of a hybrid Rule-Based (RB) and Model-Based (MB) intelligent system termed Power system Protection Smart Tool...
The high penetration of Distributed Generators (DGs) increases the need for monitoring and protection of the distribution system. The stochastic nature of the DGs may result in varying fault currents seen by the conventional over-current protection relays and thereby disturb the coordination of the relays. This necessitates an effective numerical relay that can capture the changes in the varying nature...
W artykule przedstawiono podstawową informację o budowie baterii kondensatorów stosowanych do kompensacji mocy biernej w sieciach średnich napięć. Podano zasady zabezpieczania od skutków zwarć, przeciążeń, wzrostu i obniżenia napięcia. Zaproponowano nowy sposób zabezpieczania od skutków przeciążeń baterii kilkuczłonowej i wprowadzenie zabezpieczenia napięciowego od skutków zwarć wewnętrznych dla baterii...
This paper investigates the relationship between post fault transient overvoltages and the functionality of the numerical distance protection. The study is conducted on a 66kV network with a neutral earth resistor as method to earth the power system.
In the recent period, with power systems operating closer to stability limit due to market liberalization and cross-border trade increase, and at the increasing ldquodemandrdquo related to blackout lessons, more and more protection manufacturer firms include functions of protection against ldquoasynchronous operation ldquo (out-of-step functions) in the protection numerical terminals for transmission...
The paper deals with the problem of coordination of reclosers installed in series in overhead line. Existing practice is based upon set of rules that require human interference. This may lead to errors and incorrect operation of protection. We have developed a set of algorithms that allow determining settings of protection elements providing protection against short circuit and sensitive earth faults...
Many recent blackouts might raise a concern on how the introduction of distributed energy resources or distributed generation (DG) into the network influences its secure operation in terms of dynamic performance. The anti-islanding criteria of DG may harm the secure operation of the power system. In this paper, the maximum penetration level of DG is determined using a dynamic study. Tested systems...
In this paper, a new operational strategy regarding islanding operation is presented exploiting distributed generation for islanding purposes. The presence of DG may be used to enhance reliability to final consumers by providing an alternative power source when there is an interruption in the upstream network. The feasibility of this type of operation in distribution networks is analyzed in a case...
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