Application of Frequency Domain Spectroscopy (FDS) in assessing dryness and ageing state of transformer insulation systems

Supramaniam, Gobi K; Hussien, Z.F.

doi:10.1109/pecon.2008.4762435

Cited by 12 publications

(8 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The nature of variation of these parameters with respect to temperature has been studied. From these natures, the aging and moisture content in the oil-paper insulation is predicted which was close to actual aging and moisture content of the power transformer [3][4].…”

Section: Introductionsupporting

confidence: 69%

“…It is well established that FDS is an important method to detect the condition of oil-paper insulation [3]. It is a potential tool that provides the information about the general aging status and moisture content of the oil-paper insulation within equipment such as power transformer [3].…”

Section: Introductionmentioning

confidence: 99%

“…It is a potential tool that provides the information about the general aging status and moisture content of the oil-paper insulation within equipment such as power transformer [3]. A significant fact about FDS is that, it allows the calculation of dielectric dissipation factor, real and complex capacitances at different frequencies.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparative study on the effect of temperature on frequency domain spectroscopy results under sinusoidal and triangular excitation

Pradhan

Chatterjee

Chakravorti

2012

2012 1st International Conference on Power and Energy in NERIST (ICPEN)

View full text Add to dashboard Cite

Condition assessment of in-service power transformers are becoming increasingly important for maintaining reliable and uninterruptable power supply. Among non-invasive, modern condition assessment tools, frequency domain spectroscopy is predominant in determining the aging of oil-paper insulation in power transformers. However, the results of frequency domain spectroscopy are severely influenced by other parameters, such as temperature. Also, the voltages used for studying frequency response in the laboratory are usually sinusoidal in nature. But the insulation system in operation on site is stressed by voltage that may deviate significantly from a sinusoid. Thus the use of non-sinusoidal waveform in obtaining the dielectric response is desirable for advanced insulation diagnostic technique. Considering the aforesaid facts, in this paper frequency response analysis has been performed by applying sinusoidal as well as non sinusoidal waveforms at different temperatures. A laboratory prepared oil-paper insulation sample is used that emulated the composite insulation system of a transformer. The results from sinusoidal response show a good agreement with the conventional frequency response analysis thereby validating the proposed methodology. From non-sinusoidal response, added information is obtained for closer interpretation of the actual physical condition of the sample under test.

show abstract

Section: Introductionsupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparative study on the effect of temperature on frequency domain spectroscopy results under sinusoidal and triangular excitation

Pradhan

Chatterjee

Chakravorti

2012

2012 1st International Conference on Power and Energy in NERIST (ICPEN)

View full text Add to dashboard Cite

show abstract

“…(2) and (3), it can be observed that the dissipation factor is dependent on frequency of the applied voltage. Thus, in conventional FDS, a sinusoidal excitation voltage over a wide frequency range is applied and corresponding response currents are measured.…”

Section: Sincementioning

confidence: 99%

“…In FDS, pure sinusoidal voltages are used in laboratory for condition assessments of oil-paper insulation [1][2][3]. But when a transformer remains under operating condition in the field, the insulation inside the transformer is often stressed by the nonsinusoidal voltages.…”

Section: Introductionmentioning

confidence: 99%

Frequency domain spectroscopy of oil-paper insulation under sinusoidal and square wave excitations

Pradhan

Chatterjee

Chakravorti

2013

2013 IEEE 1st International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)

View full text Add to dashboard Cite

It is well known that the sinusoidal voltages over a wide frequency range are used in laboratory for Frequency Domain Spectroscopy of oil-paper insulation. But in practice, when a transformer remains in operating condition, the insulation inside the transformer is often stressed by the voltage that deviate significantly from sinusoid due to presence of harmonics. So, use of non-sinusoidal excitation voltage is required in advanced diagnostic technique for proper monitoring of insulation condition. Considering the facts, an arrangement has been made in laboratory that can generate sinusoidal as well as non-sinusoidal excitations over a wide frequency range. Square wave excitation has been chosen here as non-sinusoidal excitation. Samples with different preset moisture contents have been prepared in the laboratory for experimental purposes that emulate the oil-paper insulation of actual power transformer. Sinusoidal as well as square wave excitations over a wide frequency range are applied across the samples under controlled environmental conditions and corresponding dielectric response currents are measured. From applied excitation voltages and corresponding response currents, dielectric dissipation factors are calculated for both excitations. The parameters are then plotted and compared with each other. It may be observed that use of square wave excitation provides better information regarding the condition of insulation.

show abstract

Frequency Domain Spectroscopy

2013

View full text Add to dashboard Cite

Application of Frequency Domain Spectroscopy (FDS) in assessing dryness and ageing state of transformer insulation systems

Cited by 12 publications

References 2 publications

Comparative study on the effect of temperature on frequency domain spectroscopy results under sinusoidal and triangular excitation

Comparative study on the effect of temperature on frequency domain spectroscopy results under sinusoidal and triangular excitation

Frequency domain spectroscopy of oil-paper insulation under sinusoidal and square wave excitations

Frequency Domain Spectroscopy

Contact Info

Product

Resources

About