Claims
- 1. An electrical insulator consisting essentially of a void-containing polymeric macromolecular insulating material suitable for use under voltage capable of causing partial discharges in said voids containing an agent for promoting an increase of the voltage thresholds liable to cause said partial discharges, said agent being present in an amount of 0.001 to 5 percent of said polymeric macromolecular insulating material, said agent being formed by at least one metal chelate which is a derivative of an organic compound of the formula ##STR3## wherein x is an integer of from 1 to 4,
- n is an integer of from 0 to 4,
- R is --CH.sub.2 COOM and, when n is not 0, R may be --OH,
- M is Na or H
- the metal of the chelate being one selected from the group consisting of iron, copper, zinc, aluminum, cadmium and the metal chelate being present in the material in an amount sufficient to promote the extinction of said partial discharges.
- 2. Electrical insulator according to claim 1, wherein the content of chelate is between 0.01 and 1% by weight.
- 3. Electrical insulator in accordance with claim 1, wherein the macromolecular insulating material is polyethylene.
- 4. Electrical insulator in accordance with claim 3, wherein the macromolecular insulating material is a "low density" polyethylene, free of any metal components except said chelate.
- 5. Electrical insulator in accordance with claim 1 wherein the macromolecular insulating material is a polycondensate.
- 6. Electrical insulator in accordance with claim 1 wherein the macromolecular insulating material is a polyaddition compound.
- 7. Electrical insulator in accordance with claim 5 wherein the polymeric macromolecular insulating material is a polyester.
- 8. Electrical insulator in accordance with claim 6 wherein the polymeric macromolecular insulating material is a polyepoxide.
- 9. Electrical insulator in accordance with claim 1, wherein x is 2 or 3 and n is zero, 1 or 2.
- 10. Electrical insulator in accordance with claim 9, wherein said chelate is a metal ethylenediamino tetracetic acid chelate.
- 11. Electrical insulator in accordance with claim 9, wherein the metal chelate is a metal propylenediamino tetracetic acid chelate.
- 12. Electrical insulator in accordance with claim 9, wherein the metal chelate is a metal N-hydroxy-ethylene-diamino-triacetic acid chelate.
- 13. Electrical insulator in accordance with claim 9, wherein the metal chelate is a metal diethylene triamino-pentacetic acid chelate.
- 14. Electrical insulator in accordance with claim 9, wherein the metal chelate is a metal nitrilo-triacetic acid chelate.
- 15. In an electrical apparatus operative under high electrical field and voltage comprising a conductor and a void-containing macromolecular polymer insulator, said voids being liable to give rise to partial discharges, under such high electrical fields, the improvement, for promoting an increase of the voltage thresholds liable of causing said partial discharges in the voids of said insulator, wherein said insulator comprises from 0.001 to 5 percent by weight of at least one metal chelate which is a derivative of an organic compound of the formula ##STR4## wherein x is an integer of from 1 to 4,
- n is an integer of from 0 to 4,
- R is --CH.sub.2 COOM and, when n is not 0, R may be --OH,
- M is Na or H
- the metal of the chelate being one selected from the group consisting of iron, copper, zinc, aluminum and cadmium.
- 16. An electrical apparatus according to claim 12 wherein the apparatus is a capacitor the dielectric of which is formed of said insulator.
- 17. An electrical apparatus according to claim 15 wherein said conductor carries an electric current at a voltage of at least 50 kV.
- 18. An electrical apparatus according to claim 15, said apparatus being a high voltage electrical power line, the sheath of which is formed of said insulator.
- 19. An electrical apparatus according to claim 18, wherein the macromolecular material of said sheath is a "low density" polyethylene.
- 20. An insulator according to claim 1 wherein there is 0.01 to 1.0% of said agent present.
Priority Claims (1)
Number |
Date |
Country |
Kind |
75 21779 |
Jun 1975 |
FRX |
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Parent Case Info
This is a continuation of application Ser. No. 588,207 filed June 19, 1975, now abandoned.
US Referenced Citations (3)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1901653 |
Jul 1970 |
DEX |
Continuations (1)
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Number |
Date |
Country |
Parent |
588207 |
Jun 1975 |
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