On-line PD detection and localization in cross-bonded HV cable systems

Sheng, Bojie; Zhou, Wenjun; Yu, Jing; Meng, Shaoxin; Zhou, Chengke; Hepburn, Donald M.

doi:10.1109/tdei.2014.004446

Cited by 33 publications

(6 citation statements)

References 8 publications

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“…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.…”

mentioning

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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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 average risk of all the cables R in a region is therefore given as in (5), where N represent the total number of circuits in the region under consideration.…”

Section: ) Cable Component Risk Modelmentioning

confidence: 99%

“…Efforts have been made on condition based maintenance which, mainly centred on insulation condition, has not been applied with any great success despite developments in cable condition monitoring and testing techniques over the last 20 years. These include partial discharge [5], [6], Ultra-low frequency dielectric loss test for medium voltage cables [7], damped oscillatory wave test [8], and sheath current monitoring and infrared temperature measurement [9]. The authors' experience is that these expensive condition monitoring techniques can only help identify a small proportion of failure related problems.…”

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confidence: 99%

A Holistic Approach to Risk-Based Maintenance Scheduling for HV Cables

et al. 2019

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Regular maintenance inspection and testing is essential in extending cable life and reducing failure probability. This can be achieved by improving the conduit conditions and taking corrective actions on faulty cable components and accessories. Regulators and corporate governance among power utilities require the implementation of risk-based approaches to asset management. However, practitioners lack sufficient historical event data and knowledge that allow them to determine the failure probability of individual cable components, which is an essential component for risk assessment, due to that the high voltage (HV) cable population are relatively young, and many have not yet reached the end of their design life. This paper presents a novel holistic approach to allow the risk based maintenance strategy to be conveniently implemented for the cable conduit, cable terminations, joints, main bodies and the earthing systems separately for each cable circuit. Contributions include: (i) a failure frequency model which accounts for every past failure record of individual cable circuit components to approximate the probability of failure. This, when multiplying with the cable importance or failure consequence, yields the risk level of an individual cable component or a cable circuit; and (ii) a method of optimally scheduling the maintenance activities by setting the objective functions as the minimal cable system risk. The benefit of the simple failure frequency model has the advantage of not having to depend on human intervention and it does not need a large sample to generate valid results, as is the case with other statistical methods. Results of applying the proposed maintenance scheduling model to 21 selected High Voltage (HV) cable circuits show that the average risk can be significantly reduced while continuing with the same number of inspections and test operations.INDEX TERMS Power cable, risk based maintenance, probability of failure, maintenance scheduling. I. INTRODUCTION

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“…Crossbonding of the cable sheaths solves issues relating to induced and circulating currents but makes PD location more difficult, because of the coupling effects between the centre conductor and cable sheath. Based on the previously developed cable transfer function [53], the coupling effect within such cable systems was quantitatively studied. By comparing the polarity and magnitude of a pulse detected by HFCTs among phases A-C at same CB linkbox, as shown in Fig.…”

Section: Partial Discharge (Pd)mentioning

confidence: 99%

Review of recent research towards power cable life cycle management

Zhou

Dong

2017

High Voltage

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Power cables are integral to modern urban power transmission and distribution systems. For power cable asset managers worldwide, a major challenge is how to manage effectively the expensive and vast network of cables, many of which are approaching, or have past, their design life. This study provides an in-depth review of recent research and development in cable failure analysis, condition monitoring and diagnosis, life assessment methods, fault location, and optimisation of maintenance and replacement strategies. These topics are essential to cable life cycle management (LCM), which aims to maximise the operational value of cable assets and is now being implemented in many power utility companies. The review expands on material presented at the 2015 JiCable conference and incorporates other recent publications. The review concludes that the full potential of cable condition monitoring, condition and life assessment has not fully realised. It is proposed that a combination of physics-based life modelling and statistical approaches, giving consideration to practical condition monitoring results and insulation response to in-service stress factors and short term stresses, such as water ingress, mechanical damage and imperfections left from manufacturing and installation processes, will be key to success in improved LCM of the vast amount of cable assets around the world.

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On-line PD detection and localization in cross-bonded HV cable systems

Cited by 33 publications

References 8 publications

Effects of Thermal Cycles on Interfacial Pressure in MV Cable Joints

Effects of Thermal Cycles on Interfacial Pressure in MV Cable Joints

A Holistic Approach to Risk-Based Maintenance Scheduling for HV Cables

Review of recent research towards power cable life cycle management

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