ICAAS &amp;#x2014; Integrated system for lasting accelerated aging of MV cables, data monitoring and acquisition

Mladenović, Ivana; Weindl, Christian

doi:10.1109/ceidp.2009.5377913

Cited by 10 publications

(5 citation statements)

References 2 publications

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“…To assure material and personal security, additional measures have been taken. The functionality of the whole system was proved in a pretest, which has been running since august 2008 for about six months without interruption, [6], [7], [8]. Based on a continuous and sample-wise monitoring of the PD and the tan(δ) values and their development during the aging process, an "aging" database will be built up.…”

Section: Resultsmentioning

confidence: 99%

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Fully Automated MV Cable Monitoring and Measurement System for Multi-Sample Acquisition of Artificial Aging Parameters

Freitag¹,

Mladenović²,

Weindl³

2024

RE&PQJ

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The Power quality of our networks is influenced by transients, short-and long-duration variations, voltage unbalance, waveform distortions, voltage fluctuations and power frequency variations. These impacts affect the aging rapidity of the electrical equipment and finally the entire electrical network. By partial discharge (PD) and tan(δ) analyses, it is possible to determine the electrical equipment's condition. The significance of the results depends on the quality of the measurement system and of the data interpretation. Based on these results, a reliable maintenance and investment strategy could be made, and the reliability of the network could be improved. A specially designed aging system for the accelerated aging of MV cables has been developed to point out the most relevant aging parameters and their limits, and, in this way, to upgrade the accuracy of the MV cable diagnostics. In this paper, the system's "intelligence", which controls the aging process and acquires, evaluates and stores all necessary data is presented.

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Section: Resultsmentioning

confidence: 99%

“…The cables themselves are situated in an air-conditioned container. Besides the circulation ventilators, there are several cooling ventilators and an additional heating facility installed, [4], [7], [8].…”

Section: A Physical Structurementioning

confidence: 99%

Fully Automated MV Cable Monitoring and Measurement System for Multi-Sample Acquisition of Artificial Aging Parameters

Freitag¹,

Mladenović²,

Weindl³

2024

RE&PQJ

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“…In order to deepen the knowledge about the dependencies and physical backgrounds, the dissipation factor and the PD values will be further monitored during the entire accelerated ageing experiment amongst other values, [1][2][3][4]. Additionally all PD values will be normalized on the already measured temperature-and time-specific calibrator values using the developed SQL-database system in the future.…”

Section: A) Cable Sample From a Group Of Cables In A Better Conditionmentioning

confidence: 99%

Dependencies of the PD- and tan(δ)-characteristics on the temperature and ageing status of MV PILC cables

Mladenović

Weindl

2011

2011 Electrical Insulation Conference (EIC).

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Diagnostic tools and methods for the state evaluation of MV (medium voltage) and HV (high voltage) power cables are mostly based on single key parameters like the partial discharge (PD) levels (inception voltage and intensity) or the values of the dissipation factor tan(δ). The main goals are the determination of the functionality and actual condition of the equipment. Additionally, the prediction of the rest life-time of power components could help to improve the investment planning and the maintenance strategy. In the field of cables and especially in case of PILC (Paper Insulated Lead Covered) cables, the requirements on the measurement technology and diagnostic systems are rather complex. In many cases the attention is directed to the methodology and the accuracy of the measurement equipment itself or to the value or spectrum of the measurement frequencies. However, the reliability of these methods is also very dependent on the experience of the test engineers and the knowledge and interpretation of all measured parameters. Therefore, besides the electrical parameters, in particular the temperature and humidity during the measurement, the equipment's dimensions, cable lengths and noise levels besides others must be taken into account. In this article, the principal dependencies of two major electrical criteria, which are the tan(δ)-and the PD-characteristics on the cable temperature and the cable age or the operational history of the cables, are presented. The strong correlation on e.g. the temperature makes clear, that the interpretation of a single criteria and a subsequent prognoses of the cable status are nearly impossible without further information. The derived results would be a subject of an immense scattering depending on seasonal influences, the load status during the disconnection of the analyzed lines, time constants, cable length, etc.

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“…Since the nature of partial discharges is rather stochastic, as shown in [3], and the tan(δ) is nonlinearly dependent on the temperature, these are not suitable and reliable parameters for the determination of the AF. Therefore other statistical and diagnostic criteria must be taken into account to obtain the unknown AF.…”

Section: Introductionmentioning

confidence: 98%

“…Therefore, a novel system for the accelerated ageing of MV cables called ICAAS was developed and realized, [1][2][3][4][5]. The aim is to find suitable parameters describing the ageing process of PILC cables by a constant monitoring of the relevant ageing parameters.…”

Section: Introductionmentioning

confidence: 99%

Development of the p-factor in an accelerated ageing experiment of the MV PILC cables

Weindl

Mladenović

Scharrer

et al. 2010

2010 10th IEEE International Conference on Solid Dielectrics

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Insulation materials deteriorate with time due to numerous operational and environmental influences. Owing to thermal and electrical ageing, moistening, etc., several chemical and physical deterioration processes in the insulation materials arise, which result in the decrease of the electrical strength and influence dielectric processes and characteristics like conduction processes and the polarization of the insulation. By using the return voltage method (RVM) it is possible to determine probable decrease in electrical strength without damaging. This method has been shown as very appropriate particularly in the case of cables with impregnated paper insulation. MV PILC (medium voltage paper insulated lead covered) cables and its remaining time of life are in the focus of an international research project for which purpose an automated ageing system called ICAAS (Integrated Cable Accelerated Ageing System) was developed. The RVM method was applied on specially selected samples of the entire test field with an average operation age of 20, 40 and 60 years. All Cables in the test field will be artificially and continuously aged in the ICAAS for around two years. In this article the results of the initial return voltage measurements are presented and discussed. The measurements were repeated in defined time intervals, and the influences of the ambient temperature and the air humidity were monitored. The return voltage curves under different conditions and corresponding pfactors were determined and shown.

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ICAAS — Integrated system for lasting accelerated aging of MV cables, data monitoring and acquisition

Cited by 10 publications

References 2 publications

Fully Automated MV Cable Monitoring and Measurement System for Multi-Sample Acquisition of Artificial Aging Parameters

Fully Automated MV Cable Monitoring and Measurement System for Multi-Sample Acquisition of Artificial Aging Parameters

Dependencies of the PD- and tan(δ)-characteristics on the temperature and ageing status of MV PILC cables

Development of the p-factor in an accelerated ageing experiment of the MV PILC cables

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ICAAS &#x2014; Integrated system for lasting accelerated aging of MV cables, data monitoring and acquisition

Cited by 10 publications

References 2 publications

Fully Automated MV Cable Monitoring and Measurement System for Multi-Sample Acquisition of Artificial Aging Parameters

Fully Automated MV Cable Monitoring and Measurement System for Multi-Sample Acquisition of Artificial Aging Parameters

Dependencies of the PD- and tan(&#x03B4;)-characteristics on the temperature and ageing status of MV PILC cables

Development of the p-factor in an accelerated ageing experiment of the MV PILC cables

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Product

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ICAAS — Integrated system for lasting accelerated aging of MV cables, data monitoring and acquisition

Dependencies of the PD- and tan(δ)-characteristics on the temperature and ageing status of MV PILC cables