The Chaos Characteristic Identification And Control Of The Arc In The Switches

Power development related to people's livelihood, and the power transmissionequipments are the bones of the modern strong power grid. Switches as one of the mostimportant electrical transmission and distribution equipments, arc is inevitably generated in themillisecond time-millimeter space during the breaking process, affecting the breakingperformance. Arc as the fourth state of physical form, the law of complicated mechanism anddevelopment is the hot spot and difficult spot that the domestic and foreign researchersconcerning. The chaos theory is introduced in order to research the common mechanism of thedifferent dielectric switches arc and discover the inherent laws of arc, and achieve the goal ofthe arc control.Chaos characteristics research of the low voltage air arc based on the black arcmodel analysis and experiments. Using220V air arc generator device self-built, the actualloads are taken as the research objects, based on the chaotic phase space reconstruction theory,C-C method, Wolf algorithms and Cao method, the dynamic chaotic behavior of the air arccurrent is quantitatively researched under the resistive, inductive and resistive load conditions,and also the chaotic attractor and the road leading to chaos are identified. While Cassie arcmodel is introduced, compared with the measured data, the essential characteristics of the arcare revealed and described.Chaos characteristics research by the three-dimensional field analysis and thesynthetic circuit experiment simulation of the medium voltage vacuum arc.40.5kV/25kAvacuum circuit breaker (VCB) is taken as the research object, based on the finite elementmethod (FEM) to simulate, the time series of longitudinal magnetic field with different typecontacts structures are obtained, the relationship between the structural changes and chaoscharacteristics is researched; and the introduction of two parameters and four parameters typesynthetic circuit experiment model that based on the DL standard to analyze the chaosevolution behavior of the VCB as a unit in the system. Based on the continuous transitionmodel to quantitatively describe the arc behavioral characteristics of the VCB in the process ofbreaking, and also the arc chaotic characteristics and attractor morphology are identified.The chaos variation of gas flow parameters traced and analyzed in the high voltage SF6CB under the cold gas breaking condition. The252kV SF6CB is taken as the researchobject, and the finite volume method (FVM) and factor analysis methods are coupled used toobtain the main effects of gas flow parameters in the whole breaking process, the principalcomponent is analyzed, the mathematical description of gas flow parameters to judge the gasparameters performance is obtained; the550kV SF6CB is taken as the object, the gas flowturbulence characteristics are analyzed by use of FVM, taken the static and dynamic contactseparation time as the separation point, analyze the turbulence parameters the time before andafter super path, the turbulent parameters chaos characteristic are researched during the twoperiods, it is shown that turbulence itself is intermittent that behaving the uncertainty time andspace with turbulent and non-turbulent boundary zone.The arc chaos behavior research of the high voltage SF6CB under the short currentbreaking condition.550kV SF6CB is taken as the object, the equivalent unit dynamic arcmodel is introduced, the gas flow field distribution under short-circuit breaking process aresimulated by use of FVM. Different observation points time series are extracted, comparedwith no load breaking condition that the high voltage SF6CB is a time-space chaos and is theintermittent chaotic state. By tracking the flow state of arc and the gas flow that it can increasethe arc turbulent region, expand the area between arc and gas flow, to achieve the rapidextinction purposes in the breaking. By changing the nozzle structures to adjust the chaos isthe effective way, and the nozzle structures are optimized which can reduce the chaotic effect,improve the CB breaking performance, and achieve the purpose of the chaos use and control.The common research of switches arc characteristics of different dielectric in thetime domain, space domain and the net domain. By reconstructing the complex networksthrough the time series of the low voltage air arc, metal vapor vacuum arc and high voltageSF6gas arc, expand the time data to the network by use of the phase space reconstruction, alsothe complex network theory is used to analyze the network characteristic, and research thecommon problems of different dielectric morphology arc, it is shown that the networks ofdifferent switches time series have the scale-free characteristics, belong to the complexnetwork features."Chaos" and "Complex networks" as the means of different dielectric arctheory and experiment research among the time domain, space domain and net domain toestablish a new analysis and communication bridge.