(ABB技术应用白皮书5)Circuit-breakers-for-direct-current-applications 2011【经典】.pdf

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  • 4.1 Storage batteries

    Structureofastoragebattery

    4Generation

    TechnicalApplication Papers

    幕墙标准规范范本4.2 Static conversion

    4.2 Static conversion

    4.3 Dynamo

    The following figure shows the structure of a dynamo

    5 Remarks on the interruption of direct curre

    Jirectcurrentpresentsdifferentpr nalternat ing current with aregard to the phenomena associated to the interruption of high value currents since the arc extinction results to be particularly difficult.

    To understand the above, reference to the circuit shown in the figure shall be made:

    The current keeps on rising for a short instant also after the beginning of contact opening, and then decreases depending on the value higher and higher of the arc

    nofdirectcurrent

    Commonsolution Figure 9 Network insulated from earth

    6.1Network insulated from earth

    also thisfault (as faultB)between a polarity and earth has no consequences fromthe point of view of theplant operation

    Doublefault(faultB+faultC)

    Technical Application Papers

    6.2 Network with one polarity earthed

    electricity to be discharged to earth.

    electricity to be discharged to earth

    upply source

    Conclusions

    Technical Application Papers

    6.3Network with the middlepoint of the

    6.3Networkwiththemiddlepointof the supplysourceconnectedtoearth

    Common solutior

    FaultB: the fault between the polarity and earth sets up a short circuit current lower than that relevant to the fault be tween the two polarities, since it is supplied by a voltage equalto depending on the soil resistance.

    Fault C: in this case, the fault is analogous to the previous case, but it concerns the negative polarity.

    Conclusions

    Technical Application Papers

    7 Choice of the protective device

    RatedoperationalvoltageUe It represents the value of voltage which determines the application of the equipment and to which all the other oarameterstypicaloftheeguipmentarereferred

    Technical Application Papers

    protectivedevice

    Technical Application Papers

    modality of poles (for MCCBs type SACE Tmax X7) in an insulated ne

    protectivedevice

    Technical Application Papers

    or higher voltagas, ask ABE

    Technical Application Papers

    for higher voltage ask ABE

    TechnicalApplication Papers

    8 Use of alternating current equipment in

    锅炉标准规范范本ipmentindirectcurren

    Technical Application Papers

    Table 19 Coefficient km accordling to the connection modality of the CB poles

    I3= 10 xIln x km = 10 x 160 x 1.3= 2080 A (±20% tolerance)

    检测试验8.2ConnectionoftheCBpoles inparallel

    ent in direct curreni

    ....
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