High-voltage distribution switchgear. Review of progress

Garrard, C.J.O.

doi:10.1049/piee.1969.0191

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Without the fuses, the breaking capacity may be of the order of 10 kA or less. 3 In the neighbourhood of large concentrations of motors, it may happen that c.b.s have to make and carry short-circuit currents larger than those that they are called on to break. It may therefore be useful to establish by test any excess making capacity of which a design may be capable.…”

Section: Circuit Severitymentioning

confidence: 99%

High-voltage switchgear

Garrard

1976

Proc. Inst. Electr. Eng. UK

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The paper begins by summarising the way in which the design of high-voltage (above 1 kV) switchgear has been affected by changes in the constitution of the manufacturing industry, both nationally and internationally, by advances in the knowledge and theory of arcs and circuit breaker operation, and by changing tendencies in service conditions that influence specification, rating and testing requirements. It describes the greatly increased application of circuit breakers and totally enclosed switchgear using sulphur hexafluoride as an arc-quenching medium and insulant, the commercial breakthrough of the vacuum interrupter and the universal acceptance and use of synthetic methods of testing circuit breakers. It then deals with ratings and service requirements, research and the theory of arcs and circuit breakers, standardisation and switchgear testing. It concludes by illustrating, with examples, the current trends in the design of apparatus, especially circuit breakers, and the layout and equipment of switchboards and substations.

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Section: Circuit Severitymentioning

confidence: 99%

High-voltage switchgear

Garrard

1976

Proc. Inst. Electr. Eng. UK

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“…3,4 Air-insulated switchgear cabinet is a closed equipment integrated by circuit breaker, isolating switch load switch, mutual inductor and other protection device. 5 Due to the closed structure, the insulation defect-induced damage can be more serious than that in the open-type equipment once the discharge occurs. 6 In addition, the compact structure of air-insulated switchgear cabinet raises the probability of the discharge occurrence along with the decrease of internal insulation spacing.…”

Section: Introductionmentioning

confidence: 99%

Study on the characteristic decomposition components of air-insulated switchgear cabinet under partial discharge

Gui

Zhang

et al. 2016

AIP Advances

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Air-insulated switchgear cabinet plays a critical role in entire power transmission and distribution system. Its stability directly affects the operational reliability of the power system. And the on-line gas detection method, which evaluates the insulation status of insulation equipment by detecting the decomposition components of filled air in cabinet, becomes an innovative way to ensure the running stability of air-insulated switchgear cabinet. In order to study the characteristic gas types and production regularity of decomposition components under partial discharge, three insulation defects: needle-plate, air-gap and impurity defect are proposed to simulate the insulation defects under partial discharge in air-insulated switchgear cabinet. Firstly, the generation pathways and mechanism of composition components are discussed. Then CO and NO2 are selected as the characteristic decomposition components to characterize the partial discharge due to their high concentration and chemical stability. Based on the different change regularity of CO and NO2 concentration under different insulation defect, it provides an effective way to evaluate and predict the insulation defect type and severity in the field.

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