چكيده به لاتين
Abstract
The transmission lines are exposed to various types of faults. About 85% of faults in power systems are transient and almost the same percentage of faults are single-phase to ground faults. For maintaining stability, it is necessary that faulty line quickly becomes deenergized. Also, if faulty area has been interrupted for a long time, network will be exposed to potentially instability hazards, equipment damage, and significant disturbances in the system. By using recloser relay, stability and reliability of power system will be increased and the cost of operation will be decreased.
In this thesis, the terms of use and how to adjust the time of recloser relay has been investigated. In this regard, in the beginning, according to the review of various references, the process of using recloser relay in different situations has been presented.
In the following, considering the importance of the duration of the secondary arc in the time settings of the single-phase recloser, the effects of simulation and various parameters, including the transmission line specification, fault and compensator on the duration of the secondary arc has been investigated to obtain critical conditions for recloser relays with fixed time settings. Then a parametric equation corresponding to the environmental conditions can be used to calculate the insulating recovery time for both fixed and intelligent time recloser relays.
Finally, an algorithm is proposed for detecting the secondary arc extinction for intelligent recloser operation. The proposed algorithm, in addition to simplicity in computing, has a diagnostic error of less than 10 ms and can be used in compensated and uncompensated lines.
