Abstract
This paper presents the main results on the use of conventional protection hardware to protect a Half Wavelength Transmission Line, or shortly AC-Link, for possible occurrence of three-phase and single-phase fault during energization maneuver. Lines of these dimensions do not exist today, but in countries of continental size they could be an interesting alternative to HVDC transmission, since the AC-Link has less dependence on Power Electronics technology. The studies on performance and relay settings were implemented using the RTDS real-time simulator. It is important to note that the AC-Link protection for the energization maneuver can be performed with existing hardware on conventional relays.
Highlights
Countries with continental extensions such as Brazil, China and Russia are faced with the need to transport large blocks of energy over long distances, namely above 2000 km
This paper presents the main results on the use of conventional protection hardware to protect a Half Wavelength Transmission Line, or shortly alternating current (AC)-Link, for possible occurrence of three-phase and single-phase fault during energization maneuver
The distance relay operates at 1721 km from Serra da Mesa 1, and after that the distance protection does not operate for a 308 km section due to the operation of reduced isolation distance (RID), returning to operate in the last 572.6 km from the AC-Link
Summary
Countries with continental extensions such as Brazil, China and Russia are faced with the need to transport large blocks of energy over long distances, namely above 2000 km. The half wavelength lines exhibit behavior very similar to short lines in steady state and are more robust during transients This is an alternative to the HVDC line, because the AC-Link may present a cost of implementation up to 20% lower [6, 7]. Proposed to carry out an energization test connecting in series sections of existing lines in the Brazilian interconnected system [8,9,10,11]. This test will allow the analysis of the behavior of the AC-Link and the comparison with the studies made so far. The analysis to identify the relays settings are presented as well as the results of the protection system proposed and the main conclusions
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