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Most published Xplore authors for Sulfur Compounds

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Xplore Articles related to Sulfur Compounds

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IEE Colloquium on 'Current Environmental Applications of Electrostatic Precipitations' (Digest No.118)

IEE Colloquium on Current Environmental Applications of Electrostatic Precipitations, 1991

None


Charge deposition and insulator flashover in SF/sub 6/ under impulse voltages

IEE Colloquium on Charging and Tracking of Insulators in Gaseous and Vacuum Environments, 1990

In compressed-gas-insulated equipment, the weakest point in the system is often at the interface between the gas (usually SF/sub 6/) and the solid spacers used to support the conductors. In the present work a study was made of impulse flashover of model spacers under varying conditions. An important feature of the study was that, in all cases, the surface charge ...


Statistical processing of chopped currents and overvoltages in two types of sulphur hexafluoride breaker technology

IEE Proceedings C - Generation, Transmission and Distribution, 1990

Tests on breaking three-phase low inductive currents were carried out with two medium-voltage SF/sub 6/ breakers using different breaking techniques; the puffer method and the rotating arc. The statistical interpretation of the chopped currents and overvoltages produced by the two types of equipment showed that the two technologies performed satisfactorily, that is without excessive stresses for the system in service ...


Technical implications of hollow composite insulators for HV SF/sub 6/ switchgear

IEE Colloquium on Structural Use of Composites in High Voltage Switchgear/Transmission Networks, 1992

The successful operation of large substation and transmission networks is dependent on the integrity of individual items of plant. The minimum requirements for high voltage insulators are that they must satisfy the operational and environmental criteria for the perceived lifetime of the plant. In addition, the insulators must be realistically priced and be intrinsically safe. From the standpoint, a 'user' ...


The impact of SF/sub 6/ upon power switchgear technology. II. Switch systems implications

Power Engineering Journal, 1991

For pt. I see ibid., vol.4, no.5, p.215 (1990). A successful circuit breaker needs not only a suitable interrupter design but also a suitable medium in which to form and quench the arc. SF/sub 6/ is increasingly being used in circuit breakers as an alternative to oil and air. The author looks at the impact of SF/sub 6/ on switching ...


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Educational Resources on Sulfur Compounds

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IEEE-USA E-Books

  • IEE Colloquium on 'Current Environmental Applications of Electrostatic Precipitations' (Digest No.118)

    None

  • Charge deposition and insulator flashover in SF/sub 6/ under impulse voltages

    In compressed-gas-insulated equipment, the weakest point in the system is often at the interface between the gas (usually SF/sub 6/) and the solid spacers used to support the conductors. In the present work a study was made of impulse flashover of model spacers under varying conditions. An important feature of the study was that, in all cases, the surface charge density was measured before and after each impulse-voltage application; the equipment was designed so that the complete surface of the spacer, including both triple- junction regions, could be scanned by a charge probe.<>

  • Statistical processing of chopped currents and overvoltages in two types of sulphur hexafluoride breaker technology

    Tests on breaking three-phase low inductive currents were carried out with two medium-voltage SF/sub 6/ breakers using different breaking techniques; the puffer method and the rotating arc. The statistical interpretation of the chopped currents and overvoltages produced by the two types of equipment showed that the two technologies performed satisfactorily, that is without excessive stresses for the system in service (in particular no successive restrikes on breaking) and with acceptable overvoltages caused by chopping. The typical values of the chopped currents measured were less than 1 A for rotating arc, and 3 to 8 A for puffer type circuit breaker. The overvoltages generated by the rotating arc circuit breaker (typically 2 p.u.) remain perceptibly lower than those caused by the other circuit breaker (typically 3 p.u.), even when using the former equipment at a voltage higher than its rated voltage. The results obtained are in line with the theory and experimental results.<>

  • Technical implications of hollow composite insulators for HV SF/sub 6/ switchgear

    The successful operation of large substation and transmission networks is dependent on the integrity of individual items of plant. The minimum requirements for high voltage insulators are that they must satisfy the operational and environmental criteria for the perceived lifetime of the plant. In addition, the insulators must be realistically priced and be intrinsically safe. From the standpoint, a 'user' perspective of hollow composite insulators for pressurized applications in HV SF/sub 6/ switchgear is presented. Comparisons are made between porcelain and composite insulators in terms of their respective materials properties relevant to mechanical/electrical performance. In a more general way, some economic aspects are considered, that may influence the wider acceptance and usage of composites for HV SF/sub 6/ switchgear applications in the UK.<>

  • The impact of SF/sub 6/ upon power switchgear technology. II. Switch systems implications

    For pt. I see ibid., vol.4, no.5, p.215 (1990). A successful circuit breaker needs not only a suitable interrupter design but also a suitable medium in which to form and quench the arc. SF/sub 6/ is increasingly being used in circuit breakers as an alternative to oil and air. The author looks at the impact of SF/sub 6/ on switching systems including transmission switchgear and distribution switchgear. The effects on monitoring and control are also discussed.<>

  • Pressure rise due to a high current internal arc in an MV cubicle model

    The author discusses pressure-rise tests in SF/sub 6/ and air on a full-scale model of a 12 and 24 kV three phase MV switchgear with currents from 5 to 20 kA RMS at 10 kV RMS copper electrodes (diameter 30 mm) and an iron plate as a counter electrode and an operating pressure of 0.12 and 0.14 MPa. The tests showed that, even with reduced filling pressure for air, no acceptable correspondence between the test results can be achieved. The rapid increase of pressure that was measured inside the tank, resulting from a short-circuit current, showed that the use of an overpressure relief device almost always leads to an expulsion of hot and decomposed SF/sub 6/ gas, which is due to the low ratio between working pressure and the setting of the safety pressure relief device.<>

  • Testing requirements for composite insulators for HV switchgear

    Glass fibre components have been used in switchgear for many years as structural members and as drive links where they are subject to high stresses. Such components are now well proven in service and increasing attention is now being paid to the use of composite hollow insulators in SF/sub 6/ pressurised circuit breakers and other switchgear equipment. The author reviews the applications and requirements for such components in switchgear.<>

  • Voltage-current characteristics of SF/sub 6/ gas arc

    Summary Form only given, as follows. The authors measured and calculated voltage-current (V-I) characteristics. The results indicate that V-I characteristics show hysteresis loops. Discrepancies between the calculated and measured results are attributed to the following factors: (1) the wall radius was not constant, (2) the axial flow velocity was not exact, (3) the radiation losses were neglected, and (4) the effect of turbulence was not taken into account.<>

  • The impact of SF/sub 6/ upon power switchgear technology. I. SF/sub 6/ switch implications

    A successful circuit breaker needs not only a suitable interrupter design but also a suitable medium in which to form and quench the arc. SF/sub 6/ is increasingly being used in circuit breakers as an alternative to oil and air. The author discusses the implications on switching technology of SF/sub 6/ use. The author discusses current interruption concepts and then discusses the distinctive properties of SF/sub 6/. These properties have promoted the evolution of new forms of interrupters which are described by the author. The performance capabilities of the SF/sub 6/ interrupters are discussed.<>

  • 72 kV C-GIS composite insulation in SF/sub 6/ gas

    For further reduction in installation space, the authors have developed a second generation C-GIS (cubicle gas insulated switchgear) which makes use of a composite insulation of low pressure SF/sub 6/ gas and solid material. The new C-GIS has realized a reduction in installation space of about 50% from conventional C-GIS. The authors introduce a gas-solid composite insulation employed in the C-GIS, and a new technique that eliminates the need to recharge the insulation gas into the cubicle during the site erection, contributing to shortening the installation period while maintaining its reliability. An overview of the second generation C-GIS is given.<>



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