(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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