Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
ApparatuS for compensating for changes in oil volume in an oil impregnated electric power cable having means for supplying said oil thereto, said oil normally being maintained under a pressure within a predetermined range, said apparatus comprising at least one first pressure tank having a chamber for containing said oil and means for maintaining said oil under pressure within said predetermined range, at least one second pressure tank having a chamber for containing said oil and means for maintaining said oil in said last-mentioned chamber under a pressure substantially at least as low as the lowest pressure in said predetermined range, and means for connecting said first and second tanks to said means for supplying oil to said cable for oil flow therebetween.
Claim 2
Dependent Claim
123 words
ApparatuS for compensating for changes in oil volume in an oil impregnated electric power cable having means for supplying said oil thereto, said oil normally being maintained under a pressure within a predetermined range, said apparatus comprising at least one first pressure tank having a chamber for containing said oil and means for maintaining said oil under pressure within said predetermined range, at least one second pressure tank having a chamber for containing said oil and means for maintaining said oil in said last-mentioned chamber under a pressure substantially at least as low as the lowest pressure in said predetermined range, and means for connecting said first and second tanks to said means for supplying oil to said cable for oil flow therebetween.
Claim 3
Dependent Claim
91 words
Apparatus as set forth in claim 1, further comprising at least one further tank similar to said first tank and similarly having means for maintaining the oil in the chamber thereof under a pressure within said predetermined range connected in parallel with said first tank and at least one further tank similar to said second tank and similarly having means for maintaining the oil in the chamber thereof under a pressure substantially at least as low as the lowest pressure in said predetermined range connected in parallel with said second tank.
Claim 4
Dependent Claim
59 words
Apparatus as set forth in claim 1, wherein each of said first and second tanks comprises an elastic wall dividing at least a portion of the tank into said chamber thereof and a further chamber and said means for maintaining the oil in said first-mentioned chamber under pressure comprises means for supplying fluid under pressure to said further chamber.
Claim 5
Dependent Claim
42 words
Apparatus as set forth in claim 3, wherein said means for supplying fluid under pressure comprises a pair of expansion chambers, one connected to the further chamber of said first tank and one connected to the further chamber of said second tank.
Claim 6
Dependent Claim
46 words
Apparatus as set forth in claim 4, further comprising means including a pressure reducing valve interconnecting said further chambers, said reducing valve reducing the pressure in the further chamber of said second tank with respect to the pressure in the further chamber of said first tank.
Claim 7
Dependent Claim
24 words
Apparatus as set forth in claim 3, further comprising means limiting the movement of said elastic wall to within a predetermined range of movement.
Claim 8
Dependent Claim
60 words
Apparatus as set forth in claim 1, wherein said means for connecting said first and second tanks to said means for supplying oil to said cable comprises a flow regulating valve connected between said second tank and said means for supplying oil to said cable for limiting the rate of flow of oil from said second tank to said cable.
Claim 9
Dependent Claim
41 words
Apparatus as set forth in claim 1, further comprising means responsive to the drop of oil pressure below a predetermined value connected to said means for connecting said first and second tanks to said means for supplying oil to said cable.
Claim 10
Dependent Claim
33 words
Apparatus as set forth in claim 8, further comprising alarm means connected to said means responsive to the drop of oil pressure and operable thereby when said pressure drops below a predetermined value.