. Electrolysis and its mitigation. . economical installation but atthe expense of greater over-all potential differences in the trackreturn system, even though the limiting potential gradients in Electrolysis Mitigation 101 the track may be the same. This type of feeder system is showndiagramatically in Fig. 31. This latter plan is often more economical than the plan shownin Fig. 30, and it is sometimes to be recommended where condi-tions are such that there is a large track conductance to be availedof. Wherever the track conductance is small, however, so thatmost of the current will have to b
. Electrolysis and its mitigation. . economical installation but atthe expense of greater over-all potential differences in the trackreturn system, even though the limiting potential gradients in Electrolysis Mitigation 101 the track may be the same. This type of feeder system is showndiagramatically in Fig. 31. This latter plan is often more economical than the plan shownin Fig. 30, and it is sometimes to be recommended where condi-tions are such that there is a large track conductance to be availedof. Wherever the track conductance is small, however, so thatmost of the current will have to be returned by the feeders anyway,the equal-drop system is to be preferred, since electrolysis condi-tions will be better and the difference in cost not very great. Astill further modification of the insulated feeder system will gen-erally be found to be desirable. In this modification, instead ofrunning several independent feeders in one direction from the powerhouse, a single large feeder is run along the line and connected to rrm. /?£S/STAMCETAPS /VSGAT/VSBUS Fig. 32.—Diagrammatic representation of insulated negative feeders the tracks at suitable points by means of resistance taps. Thissystem is shown diagrammatically in Fig. 32. It has the advantageof simplicity of line construction, cheaper first cost and mainte-nance, due to running one large feeder instead of several small ones(where the total feeder area is not great), and it also has the advan-tage of bringing back a much larger load on the single feeder, whichresults in a less variable current, and this makes possible a moreeconomical use of the negative copper. From the foregoing it will be apparent that the economy ofusing insulated negative feeders as compared with uninsulatedfeeders in parallel with the tracks is so great, particularly whenit is necessary to maintain the voltage drops in the track at verylow figures, such as is usually necessary for electrolysis protection, 102 Technologic Papers o
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