138-kV six-phase transmission system feasibility. [Comparison with 230-kV double circuit conversion]

Conference · Sun Jan 01 04:00:00 EST 1978 · Proc. Am. Power Conf.; (United States)

OSTI ID:5945563

Guyker, W C ^[1]; Booth, W H; Jansen, M A; Venkata, S S; Stanek, E K; Bhatt, N B

---

1. Allegheny Power Service Corp., Greensburg, PA

The use of six-phase and other higher order phases for power transmission was proposed in 1972 as one alternative to use electrical rights-of-way more effectively and efficiently. A study of 138-kV six-phase conversion as an alternate to 230-kV double-circuit conversion is discussed with emphasis on the electrical design and performance characteristics of 138-kV six-phase transmission circuits. This study concluded that upgrading existing lines to 230-kV double-circuit or 138-kV six-phase is technically feasible. In either case, with existing conductor thermal limits, at least a 73% increase in power transmission capability is feasible over these lines. The 138-kV six-phase line may have the following advantages over a 230-kV double-circuit line: reduced conductor gradients, potentially better public acceptance since nominally it will remain a 138-kV system, improved system loading, improved stability characteristics, and potentially lower noise levels. The disadvantages of a 138-kV six-phase line over a 230-kV double-circuit line are: substation and tap point equipment changes, control system changes, the lack of experience in operating and maintaining a six-phase system, higher ground gradients, some reliability penalties, and coordination with three-phase lines and systems. Six-phase uprating of double-circuit lines becomes more attractive as right-of-way acquisition problems continue to grow and transmission capacity and economies increase in importance. (LCL)

• OSTI ID: 5945563
• Report Number(s): CONF-780440-
• Conference Information: Journal Name: Proc. Am. Power Conf.; (United States) Journal Volume: 40
• Country of Publication: United States
• Language: English

Related Subjects

200301* -- Power Transmission & Distribution-- AC Systems
EHV & UHV-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
AC SYSTEMS
DESIGN
HVAC SYSTEMS
MODIFICATIONS
PERFORMANCE
POWER SYSTEMS
POWER TRANSMISSION LINES
RESEARCH PROGRAMS