US1721295A - Electrical insulation - Google Patents
Electrical insulation Download PDFInfo
- Publication number
- US1721295A US1721295A US287652A US28765228A US1721295A US 1721295 A US1721295 A US 1721295A US 287652 A US287652 A US 287652A US 28765228 A US28765228 A US 28765228A US 1721295 A US1721295 A US 1721295A
- Authority
- US
- United States
- Prior art keywords
- electrical insulation
- tricresyl phosphate
- liquid
- dielectric
- electrical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
Definitions
- liquid insulating medium or die'letric in such devices, combine'inhigh degree high dielectric strength
- Tricrcsyl phosphate is an odorless, colorless liquid, neutral in character, non-hygroscopic, and immiscible with water, has a high flash point and is substantially non-volatile and nonburnable. It is freely fluid and has a high dielectric strength. It is very 3 stable.
- An electrical device comprising ,conduc- '60 tors adapted in use to have different electrical potential, separated by a dielectric comprising',tricresyl ph0sphate.
- An electrical device comprising conduc tors separated by liquid tricresyl phosphate.
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Organic Insulating Materials (AREA)
Description
Patented July 1929.
WILLIAM F. DOERFLINGER, OF WEST NEW BRIGHTON, NEW YORK.
ELECTRICAL No Drawing.
This invention relates particularly to dielectric substances and to electrical devices, such as transformers, oil switches and the like, in which conducting bodies differing in electrical potential are separated by a dielectric liquid. p
It is' desirable that the liquid insulating medium or die'letric, in such devices, combine'inhigh degree high dielectric strength,
freedom from moisture, acid and alkali etc., low evaporation loss for prolonged periods, high flash point, highburning point, small afiinity for water, and smalltendcncy to form carbonaceous deposits or otherwise decom- .15 pose. A considerable fluidity (or low viscosity) is also often of in'iportance.
Various materials, such as hydrocarbon oils, rosin oils, vegetable oils, etc., have been used for this purpose.
I have found that tricresyl phosphate is more suitableas a. dielectric liquid than most substances which have been proposed for this purpose.
Tricrcsyl phosphate is an odorless, colorless liquid, neutral in character, non-hygroscopic, and immiscible with water, has a high flash point and is substantially non-volatile and nonburnable. It is freely fluid and has a high dielectric strength. It is very 3 stable.
Q 'I have found the dielectric strength tested between one inch disc electrodes spaced onetenth inch apart in accordancewith A. S. T. M. Specification D. 117 24 entitled Standard method of testing transformer and switch 0ils,using a transformer rated at 125 K. V., "25 K. V. Arsupplied with current at 120 volts 60 cycles is- Application fil ed June 22,
about 13,700 volts'at puncture, I
INSULATION. I
1928. Serial No. 287,652.
using ordinary good commercial material without special drying or other treatment. 40 v I The'flash point is about 460 F. and the burning point about 705 F. It can be made to burn only with extreme difficulty.
The high burning point of tricresyl phosphate is of great importance in closed transformers of large size; also its fluidity, which is rather remarkable for a substantially nonvolatile liquid. This enables it to convey away heat generated in the transformer very efliciently, and readily self heat in case of a discharge. 7 j My invention is not concerned with the elee- 'trical construction of transformers, switches etc. In practicing it I merely use tricresyl phosphate in place of the hydrocarbon oils 5 etc. which are at present employed in apparatus of this type, such' as oil insulated trans-- formers. I i
What I claim is I e 1. An electrical device comprising ,conduc- '60 tors adapted in use to have different electrical potential, separated by a dielectric comprising',tricresyl ph0sphate.-
2. An electr cal device usinghquid 1nsu lation including"a dielectric comprising tricresyl phosphate. j
3. An electrical device using insulation consisting of tricresyl phosphate, substantially as and for the purpose described. 4;. An electric device using insulation con- 7 sisting of'liquid tricresyl phosphate,
5. An electrical device comprising conduc tors separated by liquid tricresyl phosphate.
This specification signed this 20th day of June,'1928. I 1 a WILLIAM F. DOERFLINGER.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US287652A US1721295A (en) | 1928-06-22 | 1928-06-22 | Electrical insulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US287652A US1721295A (en) | 1928-06-22 | 1928-06-22 | Electrical insulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1721295A true US1721295A (en) | 1929-07-16 |
Family
ID=23103799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US287652A Expired - Lifetime US1721295A (en) | 1928-06-22 | 1928-06-22 | Electrical insulation |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1721295A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3959162A (en) * | 1973-08-20 | 1976-05-25 | Nissin Electric Co., Ltd. | Insulating oil |
| US4321424A (en) * | 1978-03-31 | 1982-03-23 | Rte Corporation | Hydrocarbon electrical insulation oil containing tri-cresyl phosphate to increase water retention capability |
-
1928
- 1928-06-22 US US287652A patent/US1721295A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3959162A (en) * | 1973-08-20 | 1976-05-25 | Nissin Electric Co., Ltd. | Insulating oil |
| US4321424A (en) * | 1978-03-31 | 1982-03-23 | Rte Corporation | Hydrocarbon electrical insulation oil containing tri-cresyl phosphate to increase water retention capability |
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