Condition monitoring of overhead line insulator by measuring surface leakage current

Banik, Apu; Dalai, Sovan; Chatterjee, Biswendu

doi:10.1109/indicon.2014.7030540

Cited by 18 publications

(10 citation statements)

References 7 publications

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“…In order to reduce the occurrence of failures in MV cable joints, it is of major importance to understand the mechanisms leading to loss of insulation. This can be obtained by specific measurement campaigns aimed at investigating the causes of fault, as is typically done for all electrical assets (e.g., instrument transformers [5][6][7][8], overhead lines [9,10], insulators [11][12][13], capacitors, [14] etc.). Good insulation depends on several factors, such as, for a certain voltage level, interface pressure and surface smoothness, materials, manufacturing, and installation.…”

Section: Introductionmentioning

confidence: 99%

Effects of Thermal Cycles on Interfacial Pressure in MV Cable Joints

Sante

Ghaderi

Mingotti

et al. 2019

Sensors

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The use of medium voltage cable joints is mandatory when dealing with power cable faults and the installation of new lines. However, such an accessory is among the top causes of faults among the grid. To this purpose, one of the quantities monitored to understand the causes of such faults is the interfacial pressure between the insulating layers of the cable joint. In this work, the interfacial pressure between Cross-linked polyethylene (XLPE) and silicon rubber has been evaluated when the cable joint experiences thermal cycles. From the results, the pressure variation caused by the thermal cycles is demonstrated. Such a phenomenon may be connected to the generation of voids and weak spots that accelerate cable joint ageing. Therefore, proper comments and conclusions are drawn.Sensors 2020, 20, 169 2 of 13 delta at ambient temperature. The same setup is then used to perform measurements in the 5-60 • C temperature range [25]. The experiments demonstrated a relationship between the temperature and the tangent delta, affecting the cable joint service life. In [26,27], different Tanδ extraction methods are presented.The pressure between the insulating elements and the cable joint is also believed to affect the insulation effectiveness provided by the cable joint. The selection of materials plays a relevant role in this respect [28]. A method is available in literature to calculate and simulate the surface pressure [29]. The correlation between the interfacial pressure and tangent delta has been explored in [30]. The variation of the interfacial pressure with the ambient temperature was also investigated [31].As for the PD, they are considered by several experts to be an effective method to assess the "healthy" status of the cable joints. Therefore, literature provides a high number of studies on this topic. For example, new PD extraction and analysis methods are presented in [32,33], while an on-line measurement setup is described in [34]. Based on these works [30,31], a correlation between the three physical parameters involved can be established.In light of the above mentioned, the aim of this paper is to measure and evaluate the interfacial pressure between XLPE and SR when subject to thermal cycles. Such cycles aim at reproducing the ambient temperature variations that a cable joint suffers during its working life. From the results, compared also with the current literature, it can be appreciated a typical behavior, due in this case by the thermal cycles, that is cause of ageing acceleration of cable joints (as detailed below).The paper is structured as follows. In Section 2 the measurement setup and the details of its elements are described. The experimental tests are described in Section 3, while Section 4 is dedicated to the results analysis and comparison with consistent literature. In Section 5, comments on the obtained results and conclusion are drawn.

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Section: Introductionmentioning

confidence: 99%

Effects of Thermal Cycles on Interfacial Pressure in MV Cable Joints

Sante

Ghaderi

Mingotti

et al. 2019

Sensors

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“…The information obtained in the analysis of leakage current parameters, such as: the number of pulses, peak values, the effective value, the phase angle, charge accumulation, harmonic decomposition, is used to assess the level of pollution, the degree of dielectric aging, as well as to predict the insulation flashover voltage [8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Figure 1 Insulator Equivalent Circuitmentioning

confidence: 99%

“…They are ineffective, take a long time to troubleshoot and do not allow real-time monitoring of the insulation condition under operating voltage. The analysis of the published materials shows that present day works are mainly dealing with assessing the current state and predicting the probability of insulation flashover [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25]. As practice shows, after the overlap, the insulation continues to function normally.…”

Section: Introductionmentioning

confidence: 99%

Prediction of The High Voltage Insulators Service Life Based on The Effective Values of Leakage Currents

Breido

Valeriy

2021

IJEEI

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The insulation condition of overhead lines is one of the main factors affecting reliability of overhead power transmission lines. It is known that the process of insulation lapping or rupture is mainly affected by environmental conditions and the degree of pollution of the insulators surface. This paper substantiates the possibility of using the leakage current values of insulators for monitoring the state of insulation and predicting its resource. The results of experimental studies of leakage currents of high-voltage insulators depending on their service life are given, on the basis of which forecasting the possible resource of insulators is carried out. The results obtained can be used to develop more effective diagnostics for detecting insulator failures at an early stage to take appropriate measures to coordinate the insulation.

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“…Partial discharges caused by surface pollution can be negative factor that leads to failure. Surface pollution of insulation as an important factor for monitoring also is described in [6]. Authors measured surface leakage current of disc insulator in laboratory environment.…”

Section: Introductionmentioning

confidence: 99%

Study of Overhead Power Line Corridors on the Territory of Pskov Region (Russia) Based on Satellite Sounding Data

Mikhalap

Trashenkov

Vasilyeva

2019

ETR

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Overhead power lines (OPL) form the basis of a power grid. Reliable energy supply depends on no-failure operation of these long-length elements of energy infrastructure. More than 12,000 km out of 45,000 km of OPL in Pskov region (Russia) pass through forests. This study investigates the possibilities of using satellite-sensing data to assess the conditions of corridors for OPL with different voltage levels. Authors evaluated compliance of actual data with requirements of national standards. The dynamics of vegetation and local topography based on synthetic aperture radar data and multispectral images were taken into account.

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Condition monitoring of overhead line insulator by measuring surface leakage current

Cited by 18 publications

References 7 publications

Effects of Thermal Cycles on Interfacial Pressure in MV Cable Joints

Effects of Thermal Cycles on Interfacial Pressure in MV Cable Joints

Prediction of The High Voltage Insulators Service Life Based on The Effective Values of Leakage Currents

Study of Overhead Power Line Corridors on the Territory of Pskov Region (Russia) Based on Satellite Sounding Data

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