Measurements of voltage distribution on suspension insulators for HVDC transmission lines

Journal Article · Mon Aug 01 04:00:00 EDT 1983 · IEEE Trans. Power Appar. Syst.; (United States)

DOI:https://doi.org/10.1109/TPAS.1983.317746· OSTI ID:5389003

Train, D; Dube, R

A technique for measuring the DC voltage distribution on suspension insulator strings was developed. The technique involved the application of some specialized electrostatic voltmeters and distribution measurements were performed on a string of thirty glass insulators at voltages up to + or - 600 kV. Some of the factors which can influence the voltage distribution were studied. It was found that the voltage distribution was highly non-uniform with the line end insulators developing a greater than proportionate share of the applied voltage. Since the insulator string is immersed in a conducting medium (air) and the ionic current through the air surrounding the insulator string is substantially greater than the leakage current through the insulators, the voltage distribution along the string is essentially controlled by the potential distribution of the field between the line conductors and the transmission tower and is not controlled by the leakage resistances of the insulators themselves. Modification of the field distribution by the installation of a grading ring can significantly improve the voltage distribution along the string.

• Research Organization: Institut de recherche d'Hydro-Quebec, Varennes, Quebec
• OSTI ID: 5389003
• Journal Information: IEEE Trans. Power Appar. Syst.; (United States), Journal Name: IEEE Trans. Power Appar. Syst.; (United States) Vol. 102:8; ISSN IEPSA
• Country of Publication: United States
• Language: English

Related Subjects

200301* -- Power Transmission & Distribution-- AC Systems
EHV & UHV-- (-1989)
24 POWER TRANSMISSION AND DISTRIBUTION
AIR
CURRENTS
DC SYSTEMS
DISTRIBUTION
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTRICAL INSULATORS
ELECTRICAL PROPERTIES
ENERGY SYSTEMS
EQUIPMENT
FLUIDS
GASES
GLASS
HVDC SYSTEMS
IONIC CONDUCTIVITY
LEAKAGE CURRENT
OVERHEAD POWER TRANSMISSION
PHYSICAL PROPERTIES
POWER SYSTEMS
POWER TRANSMISSION
POWER TRANSMISSION LINES