Negative phase-sequence voltages on E&W transmission system

In the absence of phase transposition, overhead lines are a major source of unbalance in both currents and voltages on the transmission system. In the England and Wales (E&W) transmission system, the individual circuits are phased such that the average unbalance produced is minimized. The main n...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2006-07, Vol.21 (3), p.1607-1612
Main Authors: Emin, Z., Crisford, D.S.
Format: Article
Language:English
Subjects:
Applied sciences
Arm
Circuits
Conductors
Damage
Electric potential
Electrical engineering. Electrical power engineering
Electrical power engineering
Electronic mail
England and Wales
Equations
Exact sciences and technology
Impedance
Induction generators
Joints
Miscellaneous
Negative phase sequence (NPS)
Operation. Load control. Reliability
Outages
overhead lines
Overhead networks
phasing
Poles and towers
Power networks and lines
Power systems
Unbalance
Users connections and in door installation
Voltage
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Description
Summary:In the absence of phase transposition, overhead lines are a major source of unbalance in both currents and voltages on the transmission system. In the England and Wales (E&W) transmission system, the individual circuits are phased such that the average unbalance produced is minimized. The main negative phase-sequence (NPS) voltages on the transmission system arise at loop-in points for generation and load connection under an outage condition of one of the connection circuits and where there is a large NPS voltage induction from the parallel circuit. If not limited, excessive unbalance can cause system incidents and lead to damage of power system equipment.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2006.871014