On-line leakage current monitoring of 400 kV insulator strings in polluted areas

Fierro-Chavez, J.L.; Ramírez-Vázquez, Isaías; Montoya-Tena, G.

doi:10.1049/ip-gtd:19960678

Cited by 59 publications

(14 citation statements)

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“…Oliveira developed a leakage current monitoring system on glass-type insulators of overhead transmission lines in the northeast region of Brazil [15]. Fierro-Chavez installed aon-line leakage current monitoring of 400 kV insulator strings in polluted areasin order to help the maintenance work on these lines [16]. Operation experience shows these systems has problems on their reliability and affectivity, that is, on one hand, these systems cannot work steady for a long time [17]; what more important is that there is no comprehensive model which can relate leakage current with pollution flashover effectively.…”

Section: Introductionmentioning

confidence: 99%

Development of contamination flashover pre-warning system and analysis of operating experience

Chen

Mei

Zhu

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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Pollution flashover has been a serious threat to the operation safety for the power system. Online monitoring is one most important way for the operation and maintenance of power system. The leakage current on insulator surface is a comprehensive reflection of the insulator surface contamination, environmental conditions and other affecting factors. The purpose of outdoor insulation state on-line monitoring could be achieved by measuring and monitoring the leakage current on insulator surface. This paper showed that close relationship existed between leakage current in both low humidity and saturated moisture conditions. A negative exponential relationship exists between pollution flashover voltage and a new parameter I* which could reflect the insulator shape and the maximum leakage current under saturated humidity. The flashover voltage under saturated humidity could be predicted through current obtained under low humidity conditions. A contamination pre-warning system was constructed in accordance using this mathematical model combined with some hardware system. Pilot systems were established in some typical polluted area in Jiangsu Province. The results showed that the system could achieve online monitoring purposes. , and 1993, respectively. He has worked at Tsinghua University since 1993. His major research fields are high voltage insulation and electrical discharge, flashover mechanism on contaminated insulators, and application of pulsed electric fields.

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Section: Introductionmentioning

confidence: 99%

Development of contamination flashover pre-warning system and analysis of operating experience

Chen

Mei

Zhu

et al. 2015

IEEE Trans. Dielect. Electr. Insul.

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“…If the period of the supply voltage is T, the time window is chosen to be [to, to + mT], and the two waveforms are denoted by v (t) and i (t) respectively, then the nonlinearity measure of the insulator can be defined as: (11) where 0 E [0, mT] is the phase offset, t E [to, to + mT] and l ( )…”

Section: Defining the Nonlinearity Measurementioning

confidence: 99%

Characterizing leakage current on polluted insulators by measuring nonlinearity

Sokolowski

et al. 2014

2014 IEEE 23rd International Symposium on Industrial Electronics (ISIE)

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A new approach based on a nonlinearity measure to study the leakage current signature is proposed. Using this approach profiles for clean insulators, contaminated insulators with various contamination levels in dry and wet conditions are established. The nonlinearity measure captures a range of magnitudes for leakage currents exhibiting different signatures. The insulator nonlinearity measure decreases when the insulator is either wetted, contaminated or both wetted and contaminated. The change in this measure is significant in identifying the 'health state' of contaminated insulators and in flashover prediction, especially since contamination is one of the main causes of insulator failure, which thereafter may cause power system outages and threaten life. Further, this approach has the added advantage of application in identifying other types of disturbance waveforms which model-based and spectrum analysis methods lack.

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“…Surface leakage current of insulators refers to current flowing through the surface of an insulator under running voltage. According to the leakage current method, the insulation resistance of a normal insulator is very high: accordingly the leakage current is of a milliampere level [3] ; Once the insulator turns to a faulty insulator due to insulator deterioration, the surface leakage current of the insulator increases, and extent of variation is closely related to degree of deterioration of insulators, number of deteriorated insulators and voltage classes [2] . This method obtains voltage value of an insulator by measuring its leakage current in order to judge whether a faulty insulator exist or not.…”

Section: Introductionmentioning

confidence: 99%

Study on Insulator Deterioration Mechanism of ±800kV Transmission Lines and Live Detection Method of Faulty Insulator

Wen¹,

Zou²,

Zou³

et al. 2017

dtcse

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Abstract. According to the deterioration characteristic of insulators, leakage current changes in direct proportion to voltage distribution of insulators, however, presence of fault insulator directly affects the insulating property of transmission lines, thus a more accurate, economic and intelligent fault insulator detecting method needs to be studied. This paper designs a detection robot for live detection of faulty insulators of ±800kV ultra-high voltage direct current transmission lines. The detection approach of the device includes shorting out two insulators, collecting detection current generated by a 2500kV power supply of a detection module and leakage current of an insulator string, achieving precise data through an improved algorithm to ensure accuracy of detection results, and developing a prototype to perform simulated experiments. In accordance with experimental data, error of insulation resistance of an insulator detected by the device is within 5% so that whether an insulator of a line in normal operation is a low resistance insulator or zero resistance insulator can be effectively determined, accordingly quality status of the insulator can be judged to achieve the aim of experiments. The equipment is highly practicable and has high practical value in engineering.

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On-line leakage current monitoring of 400 kV insulator strings in polluted areas

Cited by 59 publications

References 0 publications

Development of contamination flashover pre-warning system and analysis of operating experience

Development of contamination flashover pre-warning system and analysis of operating experience

Characterizing leakage current on polluted insulators by measuring nonlinearity

Study on Insulator Deterioration Mechanism of ±800kV Transmission Lines and Live Detection Method of Faulty Insulator

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