Relaxation studies on power equipment

Birlasekaran, S.; Xingzhou, Yu

doi:10.1109/tdei.2003.1255784

Cited by 23 publications

(15 citation statements)

References 15 publications

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“…Another important aspect, reported by many researchers is the influence of several factors, including temperature, rain and electromagnetic disturbances together with transformer's volume/geometry on the FDS measurements [9,19,51,[114][115][116][117][118][119][120][121][122][123][124][125][126][127][128][129][130]. Producing a FDS measure for insulation which does not require volume/geometry might therefore be very helpful.…”

Section: Frequency Domain Spectroscopymentioning

confidence: 99%

“…A further comparison with PDC makes it clear, that while RVM is less noise-sensitive and simpler to set up on-site, the measuring results are sensitive to leakage currents due to the input impedance of the measuring instrument, polluted terminations, length and electrical characteristics of the connecting cable [128]. Furthermore the test duration is often longer and the RVM response depends critically on the charging and grounding duration [129]. Also the transformation of the RV measured data to the frequency domain is more difficult than those measured from PDC.…”

Section: Pdc Rvm or Fds?mentioning

confidence: 99%

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Electrical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

Fofana

Hadjadj

2016

Energies

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Abstract:The condition of the internal cellulosic paper and oil insulation are of concern for the performance of power transformers. Over the years, a number of methods have been developed to diagnose and monitor the degradation/aging of the transformer internal insulation system. Some of this degradation/aging can be assessed from electrical responses. Currently there are a variety of electrical-based diagnostic techniques available for insulation condition monitoring of power transformers. In most cases, the electrical signals being monitored are due to mechanical or electric changes caused by physical changes in resistivity, inductance or capacitance, moisture, contamination or aging by-products in the insulation. This paper presents a description of commonly used and modern electrical-based diagnostic techniques along with their interpretation schemes.

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Section: Frequency Domain Spectroscopymentioning

confidence: 99%

Section: Pdc Rvm or Fds?mentioning

confidence: 99%

Electrical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

Fofana

Hadjadj

2016

Energies

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“…It is found that the scale factor curve has Fig. 6c, which is a master scale curve computed by averaging the scale factor from several RC equivalent models [8,19,24] …”

Section: Extended Debye Model Responsementioning

confidence: 99%

Investigations of dielectric monitoring on an energised transformer oil–paper insulation system

Yang¹,

Nielsen²,

Ledwich³

2015

IET Science, Measurement & Technology

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Frequency domain spectroscopy (FDS) is being used to assess the insulation condition of oil-paper power transformers. However, it has to date only been implemented on de-energised transformers, which requires the transformers to be shut down for an extended period and may cause significant costs. To solve this issue, a newly improved monitoring method based on the FDS principle is proposed to implement the dielectric measurement on energised transformers. Moreover, a chirp waveform excitation and its novel processing method are introduced. Compared with the conventional FDS results, dielectric results from the energised insulation system have higher tanδ values because of the increased losses. To further understand the insulation ageing process, the effects of the geometric capacitance are removed from the measured imaginary admittance of the insulation system to enhance the ageing signature. The resulting imaginary admittance is then shown to correlate well with the central time constant in return voltage measurements results. The proposed methods address the issues on techniques used on energised transformers and provide a clue for on-line FDS diagnostic application.

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“…Electric breakdown in air causes an extremely brief electric current to flow through the air pocket. The measurement of partial discharge is the measurement of this breakdown current [11,12].…”

Section: Forces and Torques In Magnetic Field Systemsmentioning

confidence: 99%

The Humidity Effect on Machines in the Coastal Area of the Niger Delta

Afa¹

2013

AJEEE

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The environmental condition of Niger Delta is harsh with average humidity of about 85 percent (relative), and rainfall of about 2500mm. Some of the factors may affect the machine directly or indirectly. It is necessary to take a critical study to identify the effect of humidity so that proper selection could be made for safe operation and for longer life of the equipment.From the results, humidity was the most severe environmental factor that affect the machine. It was also seen that a motor stored in that environment for a year looses 15 percent of its life span due to humidity The humid effect is more severe in the rainy season therefore proper selection of machine and frequent check and drying is necessary to keep a longer life of the machine.

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Relaxation studies on power equipment

Cited by 23 publications

References 15 publications

Electrical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

Electrical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers

Investigations of dielectric monitoring on an energised transformer oil–paper insulation system

The Humidity Effect on Machines in the Coastal Area of the Niger Delta

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