Transient stability comparision of 3F and 6F systems for single &amp;#x00026; three pole switching

Raghuram, K.; Padmalalitha, M.; Sreedhar, Srisailam; Hemakesavulu, O.

doi:10.1109/tencon.2008.4766430

Cited by 1 publication

(1 citation statement)

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“…The viability was successfully demonstrated in the 1992 New York trial, when the 115 kV 3Φ double-circuit Goudey-Oakdale line was transformed into a 93 kV 6Φ line and operated commercially for three years [9]. This trial accumulated valuable operational experience and instigated others to investigate the technical issues and challenges associated with 6Φ transmission, including tower design [5,[10][11][12], transformer configuration and ferroresonance [8,13,14], transient stability [15][16][17][18], economics [19], fault analysis [20,21], relay protection [22][23][24], electromagnetic field [6,7,12,[25][26][27], noise [6,7,[25][26][27] and insulation coordination [7,27]. One of the major technical challenges is the need to add transformers at each line end to convert the three-phases into six-phases operating at an elevated phase-to-neutral voltage.…”

Section: Introductionmentioning

confidence: 99%

Transformation of a three‐phase double‐circuit overhead transmission line into a six‐phase feeder to increase power transfer capability

Shen

Cao

Crossley

et al. 2022

IET Generation Trans & Dist

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The UK net-zero target requires the integration of significant renewable energy resources into the electrical grid. This, together with the projected growth in electricity demand imposes practical challenges on the power transfer capability of existing transmission feeders. For environmental and planning reasons, construction of new overhead lines is problematic, and where possible upgrading of existing substations and lines is preferred. This paper investigates the feasibility of transforming an existing three-phase (3Φ) doublecircuit 400 kV line into a six-phase (6Φ) feeder for a simulated future GB scenario. Results indicate a 6Φ feeder, operating at a 'phase-adjacent phase' voltage of 400 kV can effectively solve the constraints of boundaries in transmission networks. When considering the various operating contingencies, associated with an important UK network boundary and its expected near-future winter-peak power transfer requirements, the thermal overload issues are mitigated by transforming a feeder from 3Φ to 6Φ. The paper demonstrates upgrading to 6Φ technology is a potential solution to certain future boundary constraints and in these cases avoids the need to build new underground or overhead AC/DC lines.

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