The evaluation of the insulation performances of the stator coil for the high power vertical synchronous hydro-generators by monitoring the level of partial discharges

Haţiegan, Cornel; Pădureanu, I; Jurcu, M; Biriescu, Marius; Răduca, Mihaela; Dilertea, Flaviu

doi:10.1007/s00202-016-0471-5

Cited by 9 publications

(7 citation statements)

References 14 publications

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“…Some studies use the maximum amplitude of 1000 pC as a reference to indicate PD activity in medium voltage machines, this threshold being based on international standards [42]. To verify this value, in [42], tests were realized in a hydro generator, where voltages of 7, 9, 10.5, and 11 kV were applied to the machine terminal, and PDs were measured. It was found that with the increase in the voltage level, the measured charge also increases, being greater than 1000 pC, which is the amplitude taken as a reference.…”

Section: Acceptance Limits Based On Pd Measurementsmentioning

confidence: 99%

“…and works in specific environments. Therefore, it would be most convenient to analyze the PD history of each asset, creating taylor-made decision rules [42,44,45,[63][64][65]. In addition, PDs are measured with different magnitudes, depending on the applied filter settings as well as the frequency response of sensors.…”

Section: State Of the Art In Measurement And Analysis Of Pdsmentioning

confidence: 99%

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Partial Discharges Monitoring for Electric Machines Diagnosis: A Review

et al. 2022

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Online monitoring of Partial Discharges (PDs) in rotating electrical machines is an useful tool for machine prognosis, as it presents reduced costs compared to intrusive inspections and is associated with relevant problems. Although this monitoring method has been developed for almost 50 years, the recent advancements in processes automation and signal processing techniques allow improvements that are still being studied by academic and industrial researchers. To analyze the current context of PDs monitoring, this article presents a literature review based on concepts of PDs in rotating machines, data acquisition techniques, state-of-the art commercial equipment, and recent methodologies for detection and pattern recognition of PDs. The challenges identified in the literature that motivate the development of more reliable and robust PD monitoring systems are presented and discussed.

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Section: Acceptance Limits Based On Pd Measurementsmentioning

confidence: 99%

Section: State Of the Art In Measurement And Analysis Of Pdsmentioning

confidence: 99%

Partial Discharges Monitoring for Electric Machines Diagnosis: A Review

et al. 2022

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“…There are three main ways of heat transfer: introduction transfer, convection heat transfer and radiation heat transfer (Haţiegan et al, 2016). The insulation effect of green building materials is determined by the combined effects of these three heat transfer methods.…”

Section: Insulation Effect Characterization Of Green Building Materialsmentioning

confidence: 99%

Insulation effect evaluation model of green building materials under ecological environment

2020

Global NEST Journal

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<p>Green building materials are an important material basis for promoting the development of green buildings, and also the foundation of building energy conservation. In view of this, an insulation effect evaluation model of green building materials is constructed. The outer wall temperature index, the equivalent thermal resistance index, the inner surface maximum temperature and the thermal inertia index are used to characterize the insulation effect of the green building materials. According to the insulation effect evaluation principle of green building materials, the outer surface and inner surface temperature deviation curves and its’ fitting curves are made. The integral area between the fitting curve and the standard line is the temperature factor. The temperature factor can be used as an evaluation parameter for the insulation effect of green building materials in a fixed temperature range. It can characterize the average insulation effect of green building materials under a certain temperature range and comprehensive evaluation of different characterization indicators. The greater the temperature factor value is, the better the insulation effect is. The experimental results show that the model can accurately reflect the overall insulation effect of green building materials under the influence of various indicators in a certain temperature range, and the evaluation accuracy is high.</p>

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“…Considering that, in the start-up phase of an energy group with a unitary power of 330 MW, the consumers of own services are fed from the National Energy System, according to the norms in force, it is necessary to monitor the supply voltage [1][2][3][4][5][6][7]. The electricity supply of the consumers of own services, afferent to an energy group with a unitary power of 330 MW, is made in the starting phase of the group, from the National Power System through a system of collector bars, known as "main bars" [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…In the start-up phase of an energy group with a unitary power of 330 MW, the electricity supply of consumers of own services is realized through the main busbar system, so that after starting the group and entering it in parallel with the National Energy System, it will switch the power supply with electricity from a block own service transformer [5]. As it can be seen from Figure 1, the block proprietary service transformer is connected to the 330 MW synchronous generator terminals via a busbar system [8,9].…”

Section: Introductionmentioning

confidence: 99%

Aspects on the Influence of Starting the Own Services Consumers of an Energy Group with Unit of 330 MW on the Power Supply

Popescu

Haţiegan

Racoceanu

et al. 2017

International Conference KNOWLEDGE-BASED ORGANIZATION

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The elaborated paper had as support a study case on the monitoring of the supply voltage on a busbar system, which feeds the electric motors that enters into the configuration of the technological flow of electricity production of an energy group with a unitary power of 330 MW. In the start-up phase of the energy groups with a unitary power of 330 MW, the consumers of their own services are supplied with electricity by means of general service transformers interconnected to the National Energy System.

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The evaluation of the insulation performances of the stator coil for the high power vertical synchronous hydro-generators by monitoring the level of partial discharges

Cited by 9 publications

References 14 publications

Partial Discharges Monitoring for Electric Machines Diagnosis: A Review

Partial Discharges Monitoring for Electric Machines Diagnosis: A Review

Insulation effect evaluation model of green building materials under ecological environment

Aspects on the Influence of Starting the Own Services Consumers of an Energy Group with Unit of 330 MW on the Power Supply

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