Long term testing and analysis of dielectric samples under DC excitation

Corr, Edward; Siew, W.H.; Zhao, Weihong

doi:10.1109/eic.2016.7548643

Cited by 5 publications

(6 citation statements)

References 8 publications

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“…The characteristic peak on the left hand side of the histograms remained throughout the three ramp tests and actually was accentuated by prior application of the negative ramp test before the final positive ramp test. In previous work it was found that this characteristic peak reduced when exposed to repeated positive DC ramp tests [8].…”

Section: B DC Test Resultsmentioning

confidence: 84%

“…In contrast when subsequent positive ramp tests were performed in quick succession in previous work [8] the number of PD events reduced. The negative ramp test allowed the dielectric sample to be re-initialised.…”

Section: Discussionmentioning

confidence: 81%

“…The polarity reversal was applied to re-initialise the sample and dislodge trapped charge within the voids in the dielectric. Previous work [8] have shown that repeated DC ramp tests of positive polarity led to a reduction of PD events and change in PD behavior. The overall aim was to investigate whether the sample remained as active in subsequent DC ramp tests following re-initialisation.…”

Section: Introductionmentioning

confidence: 88%

“…The four voltage steps used were VR/2, VR, 3VR/2 and 9VR/5. Originally the voltage ramp had three steps but in previous work it was found necessary to extend the ramp by a further step (9VR/5) to ensure the dielectric sample was active [8]. The hold period for the three lower voltages was 4 minutes.…”

Section: DC Test Methodsmentioning

confidence: 99%

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PD activity in void type dielectric samples for varied DC polarity

Corr¹,

Siew²,

Zhao³

2016

2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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Abstract-This paper discusses the DC testing of a dielectric sample (with voids) under DC conditions. The ramp test method was employed to assess whether the tests were repeatable. Three DC ramp tests were performed in quick succession. The polarity of the first/third tests was positive and the polarity of the second test was negative. The resultant partial discharge activity was analyzed for each series of tests and compared for positive and negative conditions. The results show that the inclusion of a negative ramp between two positive ramps enabled similar PD activity to be recorded in the first and second positive ramp tests. The negative cycle was used to re-initialise the test sample and allows trapped charge to migrate enabling similar PD activity in the subsequent positive ramp test. Changes in PD behavior were observed in the distribution of PD data between the tests.

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Section: B DC Test Resultsmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 88%

Section: DC Test Methodsmentioning

confidence: 99%

See 2 more Smart Citations

PD activity in void type dielectric samples for varied DC polarity

Corr¹,

Siew²,

Zhao³

2016

2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

Self Cite

View full text Add to dashboard Cite

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“…In general, PD is defined in AC voltage system. However, recently, PD in DC system was also introduced [26][27][28][29]. Time derivative of the applied voltage plays important role in PD occurrence.…”

Section: B Partial Discharge Inceptionmentioning

confidence: 99%

Partial Discharge in High Voltage Insulating Materials

Suwarno¹

2016

ijeei

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High voltage transmission has been chosen in electric power system due to its capability to transfer a large amount of electric power. Several key equipments such as generator, transformer, GIS, cable and insulator play important role in determining the reliability of the power system. The high voltage equipments in general contain gas, liquid or solid insulation. Defects and a particular condition may lead to extremely high electric field. Particularly at interfaces between gas and solid and liquid insulations, the excessive electric field may cause the breakdown of the gas while the liquid and solid insulations are still able to withstand the electric field. This phenomena is referred as partial discharge (PD). Partial discharges in high voltage equipments for long time may degrade the quality of the insulation and at the same time the appearance of discharges can be used as diagnostic signal for assessing the condition of the insulation inside the high voltage equipments. Partial discharge is an important subject investigated by many researchers and discussion in many international conferences as well as international journals or transactions. This paper discusses the measurement and experimental results and analysis on time-resolved partial discharges in gas, liquid and solid insulation. The partial discharges are presented in various distribution such as ɸ-q-n, ɸ-n and three dimensional distribution. Here ɸ is phase angle, q is the discharge magnitude and n is the discharge number. Based on the partial discharge data, diagnosis methods of high voltage equipments as also presented.

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Methods of Characterisation of DC Partial Discharge in Polymeric Cable Insulation

Morris

Siew

Given

2018

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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Partial discharge monitoring is frequently used in AC cable systems, and there exists a strong desire for the same for DC cables within the electrical power industry, given their recent increased use. However, DC PD is a less well understood phenomenon. This paper provides analysis of three methods of partial discharge characterisation: pulse duration and amplitude analysis, frequency-domain spectra analysis, and partial discharge inception voltage analysis in artificially-created voids in polymeric cable insulation samples (polyethylene and polypropylene) under both AC and positive and negative DC excitations. From these a 'finger-print' of the defects can be determined based on the distribution of energy within the discharge frequency spectrum, and the inception voltage.

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Long term testing and analysis of dielectric samples under DC excitation

Cited by 5 publications

References 8 publications

PD activity in void type dielectric samples for varied DC polarity

PD activity in void type dielectric samples for varied DC polarity

Partial Discharge in High Voltage Insulating Materials

Methods of Characterisation of DC Partial Discharge in Polymeric Cable Insulation

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