Czasopismo | PRZEGLĄD ELEKTROTECHNICZNY | Rocznik 2020 - zeszyt 11

Measures and technical means for increasing efficiency and reliability of extra high voltage transmission lines

10.15199/48.2020.11.28

nr katalogowy: 128842
10.15199/48.2020.11.28

Streszczenie

Electromagnetic transients are considered in the implementation of three-phase automatic reclose on the transmission line of extra high voltage 750 kV. The influence of automatic shunting of phases and pre-insertion active resistance for limiting the characteristics of the aperiodic component of the current, which obstructs the transition of full current through zero, is evaluated. The paper analyses measures taking into account the effect of changing the degree of compensation of charging power and the angles of switching on an SF6 circuit breaker. Sub-schemes of disconnected undamaged phases of the extra high voltage transmission line for the investigation of the aperiodic current component have been developed. The values of the pre-insertion active resistances of different connection and automatic shunting of the phases are determined at which there is an effective reduction of the characteristics of the aperiodic component of the current. In the software environment, a model was developed and switching transient processes were simulated in the 750 kV transmission line. Operating modes that are potentially dangerous for SF6 circuit breakers are determined and recommendations are given to avoid them. Currently the technical and economic requirements for power transmission lines designed for the transport of electricity from large power plants and for the communication of powerful energy systems are increasing. Today there is importance of reducing specific investment in the construction of new and reconstruction of existing lines. The solution to these issues is associated with the maximum use of power lines by increasing their power transfer capability and controlling modes, especially in operating emergency conditions and post-emergency operation of power systems.

Abstract

Stany przejściowe elektromagnetyczne są brane pod uwagę przy wdrażaniu trójfazowego automatycznego ponownego zamykania na linii przesyłowej bardzo wysokiego napięcia 750 kV. W pracy wpływ automatycznego bocznikowania faz i rezystancji wstępnej w celu ograniczenia charakterystyki aperiodycznego składnika prądu, który utrudnia przejście pełnego prądu przez zero. W pracy przeanalizowano parametry uwzględniające wpływ zmiany stopnia kompensacji mocy ładowania i kątów włączenia wyłącznika SF6. W środowisku oprogramowania opracowano model i symulowano procesy przejściowe w linii przesyłowej 750 kV. (Techniki zwiększania skuteczności i niezawodności linii wysokiego napięcia 750 kV)

Słowa kluczowe

Keywords

Bibliografia

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