Test Setup Design, and Calibration for Tan Delta Measurements on MV Cable Joints

Mingotti, Alessandro; Ghaderi, Abbas; Peretto, Lorenzo; Tinarelli, Roberto; Lama, Filippo

doi:10.1109/amps.2018.8494860

Cited by 12 publications

(7 citation statements)

References 7 publications

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“…Whilst temperature has been recognized as a major cause of cable joint failure [15,22,23], more recently, other parameters have been investigated, namely the tangent delta (Tanδ), interfacial pressure, and partial discharge (PD) level. In [24], an experimental setup is proposed for the estimation of tangent…”

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 observability of the distribution network (low and medium voltage, LV and MV) is becoming a key-factor after the huge revolution of the grid towards the smart grid concept [1][2][3][4][5]. Effective control stability of the network and fair energy billing [6][7][8] are possible when accurate measurements of the energy consumed/generated by users/producers are collected by energy meters (EM).…”

Section: Introductionmentioning

confidence: 99%

Testing of Electrical Energy Meters Subject to Realistic Distorted Voltages and Currents

et al. 2020

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This paper presents a study on revenue active electrical energy meters. The huge installation along the distribution network of these devices made them a key element for energy billing, but also for monitoring the grid status. Hence, it is evident that the relevance of guaranteeing a trusty metering performance, and consequently a proper standardization, is needed. The operation of the meters is regulated by standards harmonized with the European Directive 2014/32/EU (known as MID). Still, and not infrequently, compliance to some legacy standards is declared on the device specifications. Thus, a brief comparison between the latest standards is presented. In particular, the focus was set on evaluating the potential impact of the harmonic disturbances on the energy meter accuracy, since they are omnipresent in the modern power networks. The evaluation has been carried out on three off-the-shelf class B meters by means of a new test procedure that considers realistic and quasi-realistic harmonic disturbances. Such tests showed that realistic harmonic disturbances affect significantly only some energy meters. Therefore, the standards should not neglect this kind of scenario.

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“…Even if ITs are not the most critical asset of the grid, such as cable joints [ 4 , 5 , 6 ] and insulators may be [ 7 , 8 , 9 ], studies on them are always clear and current. As a matter of fact, the IT is a key element that provides information on what is happening to the power network in every single instant.…”

Section: Introductionmentioning

confidence: 99%

Smart Characterization of Rogowski Coils by Using a Synthetized Signal

Mingotti

Peretto

Tinarelli

2020

Sensors

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With the spread of new Low-Power Instrument Transformers (LPITs), it is fundamental to provide models and characterization procedures to estimate and even predict the LPITs’ behavior. In fact, distribution system operators and designers of network models are looking for all forms of information which may help the management and the control of power networks. For this purpose, the paper wants to contribute to the scientific community presenting a smart characterization procedure which easily provides sufficient information to predict the output signal of a Low-Power Current Transformer (LPCT), the Rogowski coil. The presented procedure is based on a synthetized signal applied to the Rogowski coil. Afterwards, the validity of the procedure is assessed within the Matlab environment and then by applying it on three off-the-shelf Rogowski coils. Simulations and experimental tests and results involving a variety of distorted signals in the power quality frequency range and by adopting a quite simple measurement setup demonstrated the effectiveness and the capability of the procedure to correctly estimate the output of the tested device.

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Test Setup Design, and Calibration for Tan Delta Measurements on MV Cable Joints

Cited by 12 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

Testing of Electrical Energy Meters Subject to Realistic Distorted Voltages and Currents

Smart Characterization of Rogowski Coils by Using a Synthetized Signal

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