Abstract
This paper presents a novel auto-reclosing blocking method for combined overhead-cable lines in power distribution networks that are solidly or impedance grounded, with distribution transformers in a delta connection in their high-voltage sides. The main contribution of this new technique is that it can detect whether a ground fault has been produced at the overhead line side or at the cable line side, thus improving the performance of the auto-reclosing functionality. This localization technique is based on the measurements and analysis of the argument differences between the load currents in the active conductors of the cable and the currents in the shields at the cable end where the transformers in delta connection are installed, including a wavelet analysis. This technique has been verified through computer simulations and experimental laboratory tests.
Highlights
Power systems use protection devices to detect and clear different types of short circuits, overloads and, in general, abnormal working conditions or fault situations that might be dangerous to the facilities and the stability of the electrical power system
Protection relays have the responsibility to clear faults that happen in their protection zones and for that purpose, a close and quite approximate location of the ground fault in electrical power systems is required for protection systems [2]
A new auto-reclosing blocking method for combined overhead-cable lines in power distribution networks has been presented in this article
Summary
Power systems use protection devices to detect and clear different types of short circuits, overloads and, in general, abnormal working conditions or fault situations that might be dangerous to the facilities and the stability of the electrical power system. If at the cable line line side and cleared up, a post-reclosing order on order the fault condition will be an unsuccessful reclosingAlso, maneuver. Two disadvantages unsuccessful reclosing maneuvers, reclosingis maneuvers, anothersignificant is the factand of creating damage in the cable, another the fact of creating extensivesignificant damage inand the extensive cable, being the most probable being the most consequence to have tocircumstance replace it entirely. Are different to remove servicecriteria a line to remove from service a line with a ground fault This technique that that determines determineswhere wherethe theground groundfault faulthashas taken place in overhead-cable line considering a grounding method mostly used in power distribution networks an overhead-cable line considering a grounding method mostly used in power networks with the the overhead overhead side side substations substations solidly solidly grounded, grounded, or or through through grounding grounding impedance impedance with with low low with ohmic value. Main contributions of the concludes with the mainSection contributions of the proposed proposed technique
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