Effect of Space Charge on Electric Breakdown of Sulfur Hexafluoride in Nonuniform Fields

Berg, Daniel; Works, C. N.

doi:10.1109/aieepas.1958.4500041

Cited by 11 publications

(4 citation statements)

References 6 publications

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“…It is important to note that the critical-pressure effect is not observed in a nonattaching gas or when the electric field in the gap is uniform. Berg and Works 13 have shown, by an interesting experiment, that the critical-pressure behaviour in electron-attaching gases can be explained on the basis of a mechanism known as 'corona stabilisation'. The breakdown voltage of a sphere-plane gap was measured by superimposing an impulse voltage on a steady-state bias voltage.…”

Section: Discussionmentioning

confidence: 99%

Influence of impulse waveshape on breakdown voltage of a nonuniform-field gap in compressed gases

Natrajan

Raju

1971

Proc. Inst. Electr. Eng. UK

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Investigations were made into the influence of the impulse waveshapes, gas pressure p and polarity on the breakdown voltage V s of a sphere-plane gap in compressed air and nitrogen. The pressure was varied from Olbf/in 2 gauge to 150lbf/in 2 gauge, the gap spacings from 6-35 mm to 102 mm and the risetimes of the impulse voltages from 2 • 1 /us to 189 /AS. For an impulse voltage of either polarity, certain gap lengths exhibited a critical-pressure effect, and the gap lengths and pressure at which this effect was observed depended on the risetime of the impulse voltage. Observations of the dependence of V s on the risetime showed that V s decreased with increasing risetimes, for risetimes of 16/xs or 40/AS, beyond which it increased again to reach a maximum at risetimes of the order of 100/u.s. For risetimes longer than 100/xs, V s again decreased with increasing risetime. This behaviour was similar for both nitrogen and air. Possible mechanisms are suggested to explain this behaviour. 1Introduction It is well known that the impulse breakdown voltage V s of a nonuniform field gap such as exists between a point and a plane is higher than that for steady-state voltage. While considerable data are available on V s for steady-state voltage, particularly in uniform electric fields, 1 * 2 very few investigations have been made into the influence of the impulse waveshape on V s in compressed gases. The earlier measurements of McConnell 3 in compressed air were confined to a single waveshape, 1-5 x 50/xs, while the data of Crouch and Whitman 4 were obtained in nitrogen at atmospheric pressure. The voltages used in their investigation had risetimes of 0-5-550/MS, and the time taken to reach 50% of the crest on a tail of a wave was 10-9000/xs.For a nonuniform-field electrode configuration, V s does not increase with pressure continually. A peak in the breakdown voltage/pressure characteristics (V s against p) has been observed at a pressure p m , and, for higher pressures up to a critical pressure p c , V s decreased. For pressures beyond p c , V s increased again. This effect was known as the 'criticalpressure effect', and was reported only for a positive polarity voltage. 5 " 7 Recently, Govinda Raju and Lakshminarasimha 8 have confirmed, in compressed air, the earlier results of Steiniger, 9 who showed that, in sulphur hexafluoride, the critical-pressure effect occurred both for positive and negative polarity voltages. Lakshminarasimha and Govinda Raju 10 have reported on the dependence of V s of a point-plane gap on the impulse risetime in compressed air.Because of our interest in compressed gases as a possible insulating medium, we have measured the impulse-breakdown voltage of compressed air and nitrogen and investigated the influence of the impulse waveshape, gas pressure and polarity on V s . The waveshapes used had risetimes of 2-1-189/as (1-67 x the time required to rise from 30% to 90% of peak value), and the time taken to decline to half the crest value was in the range of 1000/xs (±10%). Sphere-plane ga...

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Section: Discussionmentioning

confidence: 99%

Influence of impulse waveshape on breakdown voltage of a nonuniform-field gap in compressed gases

Natrajan

Raju

1971

Proc. Inst. Electr. Eng. UK

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“…In this paper, the proposed online monitoring system is used to monitor ZF40-126 GIS. Due to the sealed nature of GIS and itscomplex internal structure, parameters must be monitored to reflect both the status of GIS and the important factors which may cause the fault.With the requirements of the monitoring system and the current monitoring methods taken into consideration, theparameters includingcircuit current of SF6 circuit breakers, grounding switch status, SF6 gas temperature and pressure are monitoredin the paper [4] . Specific monitoring parameters are as follows:…”

Section: Main Variables Monitoredbythe Systemmentioning

confidence: 99%

A Multi-Layer Distributed Comprehensive On-line Monitoring System for GIS

Geng¹,

Chai²,

Zuo³

et al. 2016

Proceedings of the 2015 5th International Conference on Computer Sciences and Automation Engineering

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Gas Insulated Switchgear (GIS), as important equipment of power system, providesprimaryguarantee for its security and stability. Therefore it is significant to monitor the operating statusand working performance of GIS. In this paper, acomprehensive online monitoring system of GISwith amulti-layer distributed structure is proposed.The design realizes the monitoring of many important parameters of GIS, including the temperature of gas, the pressure of gas, operating status, three-phase mechanical properties, the characteristics of control loop, etc. The system has lots of functions such as the collectionof data, the storage and management of data, the calculation of parametersand remote communication. Field experimentsverify that the system is accurate and effective enough to meet the requirements of online monitoring.

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“…Figure 3 shows a typical example of the breakdown curves for DC voltage and for a rapidly rising pulse (Berg and Works 1958). The difference between these two curves can be explained in the following way.…”

Section: Influence Of the Voltage Puke Formmentioning

confidence: 99%

Qualitative model of breakdown in SF₆in inhomogeneous gaps

Pinnekamp¹,

Niemeyer²

1983

J. Phys. D: Appl. Phys.

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Effect of Space Charge on Electric Breakdown of Sulfur Hexafluoride in Nonuniform Fields

Cited by 11 publications

References 6 publications

Influence of impulse waveshape on breakdown voltage of a nonuniform-field gap in compressed gases

Influence of impulse waveshape on breakdown voltage of a nonuniform-field gap in compressed gases

A Multi-Layer Distributed Comprehensive On-line Monitoring System for GIS

Qualitative model of breakdown in SF₆in inhomogeneous gaps

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Effect of Space Charge on Electric Breakdown of Sulfur Hexafluoride in Nonuniform Fields

Cited by 11 publications

References 6 publications

Influence of impulse waveshape on breakdown voltage of a nonuniform-field gap in compressed gases

Influence of impulse waveshape on breakdown voltage of a nonuniform-field gap in compressed gases

A Multi-Layer Distributed Comprehensive On-line Monitoring System for GIS

Qualitative model of breakdown in SF6in inhomogeneous gaps

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Qualitative model of breakdown in SF₆in inhomogeneous gaps