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（ABB技术应用白皮书5）Circuit-breakers-for-direct-current-applications 2011【经典】.pdf4.1 Storage batteries
Structureofastoragebattery
LY/T 2400-2014 浅色松香类产品铂钴比标准试验方法4Generation
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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)
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6.2 Network with one polarity earthed
electricity to be discharged to earth.
electricity to be discharged to earth
upply source
Conclusions
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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
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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
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protectivedevice
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modality of poles (for MCCBs type SACE Tmax X7) in an insulated ne
protectivedevice
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or higher voltagas, ask ABE
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for higher voltage ask ABE
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8 Use of alternating current equipment in
NB/T 34063-2018 生物质锅炉供热成型燃料术语ipmentindirectcurren
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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)
8.2ConnectionoftheCBpoles inparallel
GB 4009-89 硅铬合金ent in direct curreni