Results 221 to 230 of about 158,290 (272)

Flashover Performance of HVDC Iced Insulator Strings

IEEE Transactions on Dielectrics and Electrical Insulation, 2007
Based on artificial icing test results, it was found that the DC flashover voltage of iced insulator strings was non-linear with different string lengths. An experimental formula of flashover voltage on iced insulators of different string lengths is introduced in this paper.
Peng Li, Jianbin Fan, Wufeng Li, Zhiyi Su, Jun Zhou   +4 more
exaly   +2 more sources

A Cumulative Pollution Index for the Estimation of the Leakage Current on Insulator Strings [PDF]

IEEE Transactions on Power Delivery, 2020
info:eu-repo/semantics ...
Hector de Santos, Miguel Angel Sanz Bobi
openaire   +4 more sources

Punctured insulator examination of a string insulator

2005 IEEE Russia Power Tech, 2005
This paper represents a punctured insulator detection method of a string insulator using a corona camera which can detect the ultraviolet light (partly corona phenomena) obtained from the high electric field stress of air around the tested insulators.
N. Pattanadech, P. Yutthagowit
openaire   +1 more source

Switching-Surge Insulation Level of Porcelain Insulator Strings

IEEE Transactions on Power Apparatus and Systems, 1964
A quantitative research report is made here, based on tests of EHV (extra-high-voltage) insulator strings. Impulse, switching-surge, and a-c tests on vertical, horizontal, and 45-degree V-strings were carried out, using both positive and negative unidirectional impulses and 250- to 3,250-?sec (microsecond) switching surges.
D. E. Alexander, E. W. Boehne
openaire   +1 more source

Research on insulation detection of insulator strings with fuzzy logical reasoning method

Kybernetes, 2009
PurposeThe purpose of this paper is to introduce the realizing process of the fuzzy logical reasoning method in relation to the insulation detection of insulator strings, especially about the establishment of the fuzzy relation matrix.Design/methodology/approachUtilizing fuzzy logical reasoning method, the online fault diagnosis of the transmission ...
Xiaoning Xu, Yixiong Nie, Xiangang Peng
openaire   +1 more source

Influence of attachment of insulating string on AC flashover strength of insulator

Proceedings of the Twenty-First Symposium on Electrical Insulating Materials, 2005
The relation between ac flashover voltage (ACFOV) and an attachment of nylon string on the insulator surface is studied in air by using a PMMA insulator which has a backside electrode. The measurements show that the ACFOV is decreased by the attachment of the string.
E. Ishikawa, Y. Yamano, Y. Takahashi, S. Kobayashi   +3 more
openaire   +1 more source

Investigation of single unit flashovers in HVDC insulator strings

IEEE Transactions on Power Delivery, 1996
In HVDC transmission lines, a special phenomenon, so-called single unit flashover, is observed under some special conditions. Only one or two insulator units repeat flashovers, not resulting in an overall flashover along the string. However, higher magnitudes of audible noise, radio and television interferences may give a serious problem.
Kouichi Ishikawa, Hiroshi Kageyama, Yasuhiro Yamada, Ryosuke Matsuoka, Susumu Ito, Kenji Sakanishi   +5 more
openaire   +1 more source

Identifying faulty insulator strings by detecting insulator corona pulse current

POWERCON '98. 1998 International Conference on Power System Technology. Proceedings (Cat. No.98EX151), 2002
The resolution to identify faulty insulator strings by detecting insulator corona current pulse was investigated in our laboratory. The influences of some facts on the detection resolution were also discussed, including the characteristics of insulators close to line, the resistance of faulty insulators, the locations of the faulty insulators, and the ...
null Cheng Rong Li, null Qian Shi, null Yang Chun Cheng, null Guo Lin, null Huang Xingquan   +4 more
openaire   +1 more source

The insulator string

Electrical Engineering, 1934
A series of tests on suspension insulators For power transmission lines is described this paper, and results are given which should be of interest to design engineers. The tests made included long-time Fatigue tests, the distribution of voltage over the insulator string, and the flashover voltage when some of the units are electrically defective.
openaire   +1 more source

Reduction of AC flashover strength by the attachment of insulating strings on the insulator surfaces

Electrical Engineering in Japan, 1992
AbstractAC flashover voltage in air (ACFOV) decreases when nylon string is attached on the PMMA insulator surface which has a backside electrode. The decrease in ACFOV by the attachment is explained by the generation and the propagation of the negative surface leader along the string.
Yoshiaki Yamano, Emi Ishikawa, Yuzo Takahashi, Shigeo Kobayashi   +3 more
openaire   +1 more source