Electromagnetic interference from a three phase double circuit 765-kV test line

Kim, Jeong-Boo; Lee, Dong-Il; Shin, Koo-Yong; Ahn, Hee‐Sung; Yang, Kaiyuan

doi:10.1109/61.736736

Cited by 5 publications

(1 citation statement)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A gap spark-over that represents a complete discharge can occur within line components in the form of dirty, cracked or loose insulators, splices, tie wires, hardware parts, defective electrical apparatus etc. Corona and gap sparkovers cause an electromagnetic interference effect (EMI) on power transmission lines and substation apparatus; they have been examined both experimentally and theoretically for many years already [1,2,5,7,8,13,14]. Assessment of their influence is an important diagnostic factor of electrical power equipment.…”

Section: Introductionmentioning

confidence: 99%

Localization and identification of corona forms based on phase-resolved images

Florkowska

Zydroń

Florkowski

2001

Meas. Sci. Technol.

View full text Add to dashboard Cite

In this paper, the detection of a corona effect based on phase-resolved images is studied. An advanced method for localization and identification of defects occurring in high voltage (HV) overhead lines and substation power equipment is presented. Under the laboratory conditions phase-resolved images of discharges, generated at certain spots within the HV transmission line, were registered. Those spots represented defects existing in the real environment and they were sources of additional corona discharges. Results indicated that phase-resolved images of corona interference are well correlated to a special kind of defect occurring within the HV overhead lines, as well as within substation power equipment.

show abstract

Section: Introductionmentioning

confidence: 99%

Localization and identification of corona forms based on phase-resolved images

Florkowska

Zydroń

Florkowski

2001

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

A study of EMF mitigation underneath power lines and lightning-shielding enhancement by extra ground wires

Metwally¹,

Heidler²

2004

Euro. Trans. Electr. Power

View full text Add to dashboard Cite

This paper presents a theoretical study of the influence of extra ground wires (EGW) on both the electromagnetic fields (EMF) mitigation underneath 765kV, 3‐phase, double circuit transmission lines and the lightning‐shielding performance. The method of moments (MOM) combined with the transmission‐line model is used to simulate both the aforementioned transmission lines comprising the towers and the lightning channel in three dimensions, where the influence of the channel radiated EMF is taken into account. For power frequency AC energization, the EMF at 1 m above the ground level and at the surface of the phase conductors, and the induced currents in both normally used top ground wires and EGW are computed for various phase arrangements and numbers of EGW. In addition, the lightning‐shielding performance with and without the EGW is introduced and discussed without AC energization. The induced voltages and currents in the phase conductors and ground wires as well as the voltage across the insulators are computed, with and without the EGW, due to different lightning‐current amplitudes and waveforms, and return‐stroke velocities. The most advantageous merits of using the EGW are as follows. (1) The EMF underneath the overhead power lines are drastically reduced with a negligible effect on the conductors' surface gradient and the charging currents. This can be generally used to meet regularity limits, especially when converting the existing 3‐phase double circuit transmission lines to 6‐phase systems so that the power handling capability can be increased by up to 73% via increasing the operating voltage. (2) The lightning‐shielding performance is significantly improved by reducing the lightning‐induced voltages and currents in the phase conductors as well as the voltage across the insulators, i.e. decreasing the probabilities of flashover and back‐flashover and enhancing the reliability.

show abstract