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外文资料
(一)Current density according to the economic section of the wire research
Current density according to the economic section at the wire, according to the following formula :
= (1-1)
Jn== (1-2)
where Ic------ design sought by the current calculation, unit A;
b----- line with the cost of wire cross-section of relations coefficient;
------ rates Potential for the yuan / (kw ? h);
------ maximum load factor, unit of h;
------ cost factors, according to state regulations, can be found on the manual;
Figure 1 wire running costs and the annual cross-section curve
standards section is not, By the plan (1), we can see that the curve F so there corresponding to the lowest point, because the power loss charges section A with the decrease of the reasons, if not envisaged curve Fs play, Section increase would inevitably lead to the increase in operating costs. So admission standards section should not only satisfy the minimum requirements of the power loss, but also reduce running costs less because
(1) In general, the establishment of factories or load a development process, the initial value is smaller than the design, gradually in order to achieve the expected value, but network is completed by the load considered, This is not consistent with the actual situation, in other words, power loss is not designed so much to the imagination;
(2) Design calculations indicate the actual load Ic than big design value;
(3) F curve relatively flat bottom.
Therefore, the selection criteria section, it should be by choice smaller than the cross section, as F curve flat bottom, operating costs of less impact, taking into account the load values, as well as changes in the law, Theoretical calculation of the power loss will be larger than the actual value. with the options to save much of the initial investment and the consumption of non-ferrous metals.
In the factory powe
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