US3748372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical cable with polymer-oil insulation
Assignee: EIDP Inc
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Filing: 1970-10-09
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Granted: 1973-07-24
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Expires: 1990-10-09
Abstract
Abstract The dissipation factor of oil-filled polymer tape insulation is reduced when the affinity of the oil and the polymer for one another is increased. For example, addition of a small amount of silicone oil to polybutene oil increases the affinity of the polybutene oil for the polymer and electrostatic treatment of the polymer surface increases the affinity of the polymer for the oil. These approaches can be used separately or in combination. The resultant insulation is useful as insulation between the current carrying conductors of electrical cable.
Inventors
- 👤 Mahon E Mc
- 👤 J Punderson
- 👤 W Vitcusky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:30
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/02; H01B3/00; H01B3/18; H01B3/20; H01B3/30; H01B3/44; H01B3/441; H01B3/443; H01B3/445; H01B3/46; H01B3/465; C; C10; C10M; C10M2203/00; C10M2203/06; C10M2205/00; C10M2205/02; C10M2205/024; C10M2205/026; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/107; C10M2211/00; C10M2211/02; C10M2211/022; C10M2211/04; C10M2211/044; C10M2211/06; C10M2213/00; C10M2213/04; C10M2213/06; C10M2215/00; C10M2215/02; C10M2215/04; C10M2215/042; C10M2227/00; C10M2227/04; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/041; C10M2229/042; C10M2229/05; C10N; C10N2040/00; C10N2040/14; C10N2040/16; C10N2040/17; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
13 words
The insulation system of claim 1 disposed between current-carrying conductors of electrical cable.
Claim 2
Dependent Claim
21 words
The insulation system of claim 2 wherein said cable is capable of operating at a voltage of at least 130 kv.
Claim 3
Dependent Claim
23 words
The insulation system of claim 1 wherein the increase in surface energy is obtained by the surface of said tape being chemically etched.
Claim 4
Dependent Claim
27 words
The insulation system of claim 1 wherein the increase in surface energy is obtained by the surface of said tape having been exposed to electrostatic discharge treatment.
Claim 5
Dependent Claim
14 words
The insulation system of claim 1 wherein said polymer tape is made of polyolefin.
Claim 6
Dependent Claim
11 words
The insulation system of claim 6 wherein said polyolefin is polyethylene.
Claim 7
Dependent Claim
11 words
The insulation system of claim 6 wherein said polyolefin is polypropylene.
Claim 8
Dependent Claim
15 words
The insulation system of claim 1 wherein said oil contains a surface tension lowering agent.
Claim 9
Dependent Claim
13 words
The electrical insulation system of claim 1 wherein said oil is silicone oil.
Claim 10
Dependent Claim
69 words
An electrical insulation system comprising a plurality of layers of fluorocarbon polymer tape and oil flooding said layers, the oil and polymer tape having an increased affinity for one another as compared to the natural affinity of said oil and polymer tape for one another, said increased affinity being characterized by increased adhesive forces between the polymer tape and the oil relative to the cohesive forces in the oil.
Claim 11
Dependent Claim
33 words
The insulation system of claim 11 wherein said oil is synthetic hydrocarbon oil and said polymer is polytetrafluoroethylene and said oil and said polymer exhibit a spreading coefficient of at least -7.0 ergs./cm2.
Claim 12
Dependent Claim
12 words
The insulation system of claim 11 wherein said oil is polybutene oil.
Claim 13
Dependent Claim
34 words
The insulation system of claim 11 wherein said oil is synthetic hydrocarbon oil and said polymer is tetrafluoroethylene copolymer and said oil and said polymer exhibit a spreading coefficient of at least -9.0 ergs./cm2.
Claim 14
Dependent Claim
12 words
The insulation system of claim 11 wherein said fluorocarbon polymer is polytetrafluoroethylene.
Claim 15
Dependent Claim
13 words
The insulation system of claim 11 wherein said fluorocarbon polymer is tetrafluoroethylene copolymer.
Claim 16
Dependent Claim
16 words
The insulation system of claim 11 wherein the increase in affinity is at least 20 percent.
Claim 17
Dependent Claim
31 words
The insulation system of claim 11 wherein said increased affinity is characterized by said polymer tape having a surface energy which is greater than the natural surface energy of said tape.
Claim 18
Dependent Claim
15 words
The insulation system of claim 11 wherein said oil contains a surface tension loweriNg agent.
Claim 19
Dependent Claim
41 words
The insulation system of claim 11 wherein said increased affinity is characterized both by said polymer tape having a surface energy which is greater than the natural surface energy of said tape and said oil containing a surface tension lowering agent.
Claim 20
Dependent Claim
41 words
An electrical insulation system comprising a plurality of layers of polymer tape and an oil selected from the group consisting of paraffinic oil or synthetic hydrocarbon oil flooding said layers, said oil containing silicone oil as a surface tension lowering agent.
Claim 21
Dependent Claim
19 words
The insulation system of claim 21 wherein said agent comprises from 0.01 to 10 vol. % of said oil.
Claim 22
Dependent Claim
18 words
The insulation system of claim 21 wherein said agent comprises 0.1 to 2 vol. % of said oil.
Claim 23
Dependent Claim
12 words
The insulation system of claim 21 wherein said oil is polybutene oil.
Claim 24
Dependent Claim
14 words
The electrical insulation system of claim 21 wherein said polymer tape is surface activated.
Claim 25
Dependent Claim
116 words
An electrical insulation system comprising a plurality of layers of fluorocarbon polymer tape and oil flooding said layers, said oil being inert to the polymer tape, the oil and the polymer tape having an increased affinity for one another as compared to the natural affinity of said oil and said polymer tape for one another, the increased and natural affinity being defined by the equation S gamma L (Cos theta - 1) wherein S is the spreading coefficient, gamma L is the surface tension of the oil and theta is the contact angle between the oil and the polymer tape, the increased affinity being characterized by an increase in spreading coefficient of at least 20 percent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |