Development of on-site diagnostic method for XLPE cable by harmonics in AC loss current

Tsujimoto, Tomiyuki; Nakade, Masahiko; Yagi, Yukihiro; Adachi, Kazunari; Tanaka, Hideo

doi:10.1109/icpadm.2003.1218356

Cited by 20 publications

(31 citation statements)

References 1 publication

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“…As the deterioration advances, the I3 tends to grow and the θ3 decreases, showing a trend to a fixed direction [7].…”

Section: Diagnostic Methods Using Harmonic In Loss Currentmentioning

confidence: 99%

“…Therefore it cannot discriminate between the occurrence of numerous water trees with slight deteriorations, and a few water trees with serious deterioration [7].…”

Section: Diagnostic Methods Using Harmonic In Loss Currentmentioning

confidence: 99%

“…7. Water tree deterioration and loss current waveform [7] Observing the waveform shown in Fig. 7, procedure 2, and comparing it with the waveform shown in Fig.5, procedure 1, there is a significant difference from one to another.…”

Section: Experimental Loss Current Measurement Circuitmentioning

confidence: 99%

“…6. Loss current measuring circuit -procedure 2 [7] On the other hand the Fig. 7 shows loss current waveform obtained from degraded sample using the measurement circuit presented at Fig.6.…”

Section: Experimental Loss Current Measurement Circuitmentioning

confidence: 99%

“…Loss current waveforms are obtained as discrete numerical data using a digital oscilloscope. A test voltage of 1 kV (50 Hz) was used in current loss measurement [7]. Fig.…”

Section: Experimental Loss Current Measurement Circuitmentioning

confidence: 99%

See 4 more Smart Citations

A comparative analysis of loss current obtained by measuring circuits used in studies of degradation power cables

Lima¹,

Finazzi²,

Carvalho³

et al. 2016

REPQJ

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Abstract-It is widely recognized that water tree degradation would cause serious problems and it is generally agreed that is one of the most hazardous factor in the life of XLPE power cables and hence a major cause of MV power insulation premature failure. Such accidents affect the power supply system operation and reliability. Therefore, many techniques have been developed and employed in order to detect water tree at the early stages. In this context, the loss current technique is a suitable method for investigating slight degradation, since the cable degradation by water tree gives rise to harmonics components in the loss current. A comparative analysis of the values of various performance parameters that has been used in studies to evaluate the water tree degradation in power cables, obtained from the different loss current measuring circuits, is presented. This comparative analysis is made through a mathematical procedure and confirms the possibility to identify, with a very good accuracy, the loss current only from the measured leakage current without the need for specific measurement circuit used to distinguish the loss current that flows in the insulation layer. Furthermore opens the possibility to use the Fryze's equivalent conductance to eliminate in real cases the fundamental capacitive current of the total leakage current and perform online diagnosis only from the applied voltage and total leakage current measurements.

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“…As the deterioration advances, the I3 tends to grow and the θ3 decreases, showing a trend to a fixed direction [7].…”

Section: Diagnostic Methods Using Harmonic In Loss Currentmentioning

confidence: 99%

“…Therefore it cannot discriminate between the occurrence of numerous water trees with slight deteriorations, and a few water trees with serious deterioration [7].…”

Section: Diagnostic Methods Using Harmonic In Loss Currentmentioning

confidence: 99%

Section: Experimental Loss Current Measurement Circuitmentioning

confidence: 99%

“…6. Loss current measuring circuit -procedure 2 [7] On the other hand the Fig. 7 shows loss current waveform obtained from degraded sample using the measurement circuit presented at Fig.6.…”

Section: Experimental Loss Current Measurement Circuitmentioning

confidence: 99%

“…Loss current waveforms are obtained as discrete numerical data using a digital oscilloscope. A test voltage of 1 kV (50 Hz) was used in current loss measurement [7]. Fig.…”

Section: Experimental Loss Current Measurement Circuitmentioning

confidence: 99%

See 3 more Smart Citations

A comparative analysis of loss current obtained by measuring circuits used in studies of degradation power cables

Lima¹,

Finazzi²,

Carvalho³

et al. 2016

REPQJ

View full text Add to dashboard Cite

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Approach for wide use of diagnostic method for XLPE cables using harmonics in AC loss current

Tsujimoto

Nakade

Yagi³

et al. 2008

Electrical Engineering Japan

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SUMMARYA water tree is one aspect of the degradation of XLPE cables used for underground distribution or transmission lines. We have developed the loss current method using the third harmonic in AC loss current for cable diagnosis. The harmonic components in loss current arise as a result of the nonlinear voltage-current characteristics of water trees. We confirmed that the third harmonic in the AC loss current has good correlation with respect to water tree growth and breakdown strength. After that, we applied this method to the actual 66-kV XLPE cable lines. Up to now, results on over 130 lines have been obtained. In the case of cable lines terminated at gas-insulated switchgear (GIS), we have to remove the lightning arrestor (LA) and the potential transformer (PT) from the test circuit. The reason is that we are afraid that each LA and PT disturbs the degradation signal from cable lines. It requires extra time (1 or 2 days) and costs more to remove the LA and PT in GIS from a circuit. In order to achieve easy and reasonable diagnosis, we have developed a new method for cable lines terminated at GIS by utilizing a technique that enables one to cancel the signal of the LA and PT from disturbed signal of the cable lines. We confirmed the effect of the new method through experiments with actual cables.

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Understanding of Pulse Voltage Response Analysis for Degradation in XLPE Cable Using Equivalent Circuit Model

Selvamany

Varadarajan

2022

J. Electr. Eng. Technol.

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Development of on-site diagnostic method for XLPE cable by harmonics in AC loss current

Cited by 20 publications

References 1 publication

A comparative analysis of loss current obtained by measuring circuits used in studies of degradation power cables

A comparative analysis of loss current obtained by measuring circuits used in studies of degradation power cables

Approach for wide use of diagnostic method for XLPE cables using harmonics in AC loss current

Understanding of Pulse Voltage Response Analysis for Degradation in XLPE Cable Using Equivalent Circuit Model

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