Electrical strength of air containing ozone and nitric oxides produced by intensive partial discharges

Chrzan, K.; Andino, Jean M.

doi:10.1109/94.946713

Cited by 11 publications

(7 citation statements)

References 6 publications

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“…Therefore in the initially dry arrester interior the production of moisture is possible [11]. This was confirmed by Chrzan [7] and Izumi [12] during varistor ageing by partial discharges. In their experiments small liquid droplets were found.…”

Section: Influence Of Partial Dischargessupporting

confidence: 59%

“…Therefore, it can concentrate at the bottom of the arrester and cause degradation of the varistors and the sealing. Ozone is an electronegative gas, therefore the electrical strength of air containing this gas and other by-products of partial discharges is higher than that of pure air [7]. When partial discharges cease the electrical strength of the gas mixture decreases.…”

Section: Influence Of Partial Dischargesmentioning

confidence: 99%

“…As a result new gases are created: ozone, NO x , (in air) [7], a series of gases [9]. The number of chemical compounds increases considerably in the presence of humidity, oxygen and polymer insulation materials which can be degraded.…”

Section: Influence Of Partial Dischargesmentioning

confidence: 99%

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Influence of moisture and partial discharges on the degradation of high‐voltage surge arresters

Chrzan

2004

Int Trans Elec Energy Syst

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SUMMARYThis paper reports the influence of moisture and internal partial discharges on the degradation of metal oxide varistors in high-voltage surge arresters. Both factors cause an increase in the varistor current under the operating voltage. This phenomenon is dangerous and can cause a total outage of the metal oxide arrester. In the field the moisture ingress can lead to internal discharges. Owing to recovery processes the changes in the voltage-current characteristics of varistors caused by moisture or partial discharges decrease in dry and partial discharge free conditions. The interesting behaviour of some varistors which were degraded by partial discharges was observed.

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Section: Influence Of Partial Dischargessupporting

confidence: 59%

Section: Influence Of Partial Dischargesmentioning

confidence: 99%

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Influence of moisture and partial discharges on the degradation of high‐voltage surge arresters

Chrzan

2004

Int Trans Elec Energy Syst

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“…The effect of partial discharges, environmental conditions like pollution and behaviour of surge arresters under steep front waves had been reported in the past . Darveniza et al studied zinc oxide arrester response to multi‐pulse lightning impulse currents.…”

Section: Introductionmentioning

confidence: 99%

Simulation of overvoltage stresses on surge arrester insulation

Bhuyan

Chatterjee

2015

Int. Trans. Electr. Energ. Syst.

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SUMMARYImpulse voltage testing is generally carried out for assessing the insulation strength of power equipment using standard impulse voltage waveforms in high-voltage laboratory. However, in actual field, the power equipment experiences standard and non-standard lightning impulse voltages. The main objective of this work is to analyse the voltage stress on surge arresters under standard and non-standard lightning impulse waveforms. Surge arrester models are developed in MATLAB (The MathWorks, Inc., Natick, Massachusetts, United States), and residual voltage test results are compared with manufacturer data for validation. Impulse voltage test is performed on the Institute of Electrical and Electronics Engineers surge arrester model using standard and non-standard lightning impulse voltage waveforms. The obtained test results showed that non-standard impulses have the potential to develop higher voltage stress and hence pose a high risk to surge arresters. However, results of this study provide the basis for further laboratory-based investigation considering a wide variety of impulse voltage waveforms representing the real lightning overvoltages. The test results will contribute to identify the need for modifying existing test standards or introducing new standards for impulse testing of surge arrester.

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“…Corona, surface and cavity are the three common PDs which occur frequently in many power apparatus [38,39,40]. The causes of their occurrences and the damages they pose to the machines and environment [41,42,43] are important considerations.…”

Section: Types Of Pdmentioning

confidence: 99%

Partial discharge identification by using signal processing techniques

Chia¹

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Partial Discharge (PD) detection after denoising, characterization and identification are the three main signal processing requirements of PD analysis. Voluminous digital PD data are nowadays readily available with constant improvements in PD measurement techniques. Power Engineers may be able to detect prominent PDs using oscilloscope and existing couplers. But identification of the types of developing and random occurring PD is a real challenge to any practicing engineer. In this thesis, details on using wavelet transform in the form of either continuous wavelet transform or discrete wavelet transform with two methods to denoise, identify the location of PD and retrieve PD wave shape without magnitude distortion are presented. To identify the type of PD, some experimental studies and about six existing and developed signal processing methods are carried out. Laboratory experimental study provided reproducible data with enough number of sampled points on three types of pure PD and one multisources PD. The signal processing is done on PD random occurrence in 20 ms with multicycles, and is known as group PD analysis. In single PD analysis, the individual shape of PD is extracted and analysed. Group analysis includes the study of following distributions of PD: Φ-q, Φ-n and q-n, and the corresponding statistical operators Sk, Ku and CC, weibull parameters using qcumulative n and Φ-cumulative n distributions, cluster analysis using (Δt-ΔV), (ΔV n-ΔV n-1), (Δt n-Δt n-1) and (Δ(ΔV)-Δ(Δt)) distributions and Wavelet Transform

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Electrical strength of air containing ozone and nitric oxides produced by intensive partial discharges

Cited by 11 publications

References 6 publications

Influence of moisture and partial discharges on the degradation of high‐voltage surge arresters

Influence of moisture and partial discharges on the degradation of high‐voltage surge arresters

Simulation of overvoltage stresses on surge arrester insulation

Partial discharge identification by using signal processing techniques

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