This paper proposes an algorithm for fault detection, faulted phase and winding identification of a three-winding power transformer based on the induced voltages in the electrical power system. The ratio of the induced voltages of the primary-secondary, primary-tertiary and secondary-tertiary windings is the same as the corresponding turns ratio during… (More)
The use of process-bus technology, designed in accordance with the IEC 61850 standard, introduces new opportunities for protection and control. However, before the technology can be deployed, adequate tests are required to prove use of the process bus does not have a detrimental impact on the operating performance of future protection, as expressed in terms… (More)
Due to safety concerns and the risks associated with an islanded system, current legislation has prohibited the islanded operation of distributed generation. However, operation of a temporary island may be a useful support to the main supply. In particular, in the event of an upstream supply outage, the temporary islanding operation of distributed generator… (More)
This paper describes a current differential relay for transformer protection that operates in conjunction with a core saturation detection-based blocking algorithm. The differential current for the magnetic inrush or over-excitation has a point of inflection at the start and end of each saturation period of the transformer core. At these instants,… (More)
– 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… (More)
Demand for renewable energy in electric power systems is growing as fast. Reasons, including the desire of countries to increase production capacity of wind power are the great advantages of this method production of electrical energy. Because wind energy is many, renewable and clean.
SUMMARY The primary plant and instrument transformers used in transmission substations generally remain in-service for many decades, typically 40 – 70 years, and are renewed only when physically or mechanically life-expired. However, the secondary systems, which include protection and control, are changed significantly more frequently. The current… (More)