1-15. (canceled)
16. A vacuum cartridge for an electrical protection apparatus such as a disconnecting switch, a switch or a circuit breaker, said cartridge comprising an enclosure of substantially cylindrical shape closed off by two end-plates, two contacts extending axially inside the enclosure, at least one of these contacts, the movable contact, being connected to an operating mechanism and mounted sliding between a closed position of the contacts enabling flow of the current and a position in which the contacts are separated and withstand the voltage between them, and at least one conducting shield arranged around at least one of the contacts, comprising at least two shields comprising a shield called mid-potential shield inserted between the two contacts and at least one shield called partial shield inserted between said mid-potential shield and one of the contacts, said shields being fixed at a point of the enclosure without any electrical connection with one or the other of the contacts, the distance between said mid-potential shield and the contacts being selected such that the electric field present at the edge of the contact goes from the contact to the partial shield (or vice-versa from the partial shield to the contact depending on the polarity of the voltage).
17. The vacuum cartridge according to claim 16, comprising three shields comprising one mid-potential shield and two partial shields respectively called first and second partial shield, the two partial shields being inserted between the mid-potential shield and respectively the two contacts.
18. The vacuum cartridge according to claim 16, comprising three shields, the insulating enclosure comprising four ceramic parts placed end to end, and the three shields being respectively placed at the three junctions between two joining ceramic parts.
19. The vacuum cartridge according to claim 16, wherein the mid-potential shield forms an integral part of the enclosure of the cartridge.
20. The vacuum cartridge according to claim 16, wherein the distance between the mid-potential shield and the contacts is comprised between 25% and 40% of the distance between the contacts.
21. The vacuum cartridge according to claim 20, wherein the above-mentioned distance is substantially 31%.
22. The vacuum cartridge according to claim 16, wherein the height of the partial shield or shields exceeds the height of the contact or contacts which it surrounds or they surround or of the partial shield(s) which it surrounds or they surround, by a value comprised between 0 and S3, S being the distance between the contacts.
23. The vacuum cartridge according to claim 22, wherein the height of the partial shield or shields exceeds the height of the contact or contacts which it surrounds or they surround by a value substantially equal to S4.
24. The vacuum cartridge according to claim 16, wherein at least one of the shields is cylindrical in shape.
25. The vacuum cartridge according to claim 16, comprising at least one other partial shield inserted between on the one hand at least one of the contacts and respectively one of said afore-mentioned partial shields, the distance between the mid-potential shield and the contacts being selected such that the electric field at the edge of the contacts is directed towards the partial shield(s) directly surrounding the contacts.
26. The vacuum cartridge according to claim 16, comprising two partial shields called first and second partial shield inserted between the mid-potential shield and respectively the two contacts and two other partial shields called third and fourth partial shield respectively inserted between the first and second partial shield and the two contacts.
27. The vacuum cartridge according to claim 16, wherein the shields and contacts present a relative capacitance such that the potential difference \u03b4U between two shields, one surrounding the other, is substantially identical to that between a contact and the shield surrounding it.
28. The vacuum cartridge according to claim 16, wherein the shields and contacts present a relative capacitance such that the potential difference \u03b4U between two shields, one surrounding the other, is substantially identical to that between a contact and the shield surrounding it, this potential difference \u03b4U being comprised between 15% and 35% of the total voltage.
29. The vacuum cartridge according to claim 16, wherein the shields and contacts present a relative capacitance such that the potential difference \u03b4U between two shields, one surrounding the other, is substantially identical to that between a contact and the shield surrounding it, this potential difference \u03b4U being substantially 25% of the total voltage.
30. The vacuum cartridge according to claim 27 comprising N shields, characterized in that this potential difference \u03b4U does not vary more than 40% with respect to the ratio U total(N+1), U total being the voltage between the contacts.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. Gas turbine engine component, comprising;
a ring element;
a plurality of circumferentially spaced load carrying vanes extending in a radial direction of the ring element; wherein at least one of the vanes is made of a composite material, and wherein the at least one composite vane is fastened to the ring element;
first and second wall portions that are fixed in relation to the ring element and arranged on opposite sides of the composite vane; and
at least a first hole extending through the first wall portion, the composite vane and the second wall portion, wherein the first hole is adapted to receive a first insertion member,
wherein the component is arranged such as to, with regard to the first hole, provide a tight fit for the first insertion member in the first wall portion as well as in the composite vane and to provide a loose fit with a radial play in the second wall portion; and
further wherein the component comprises a second hole extending through the first wall portion, the composite vane and second wall portion, wherein the second hole is adapted to receive a second insertion member, the first and second holes being positioned at a distance from each other as seen in an axial direction of the ring element, wherein the component further being arranged such as to, with regard to the second hole, provide a tight fit for the second insertion member in the second wall portion as well as in the composite vane and to provide a loose fit with a radial play in the first wall portion.
2. Gas turbine engine component according to claim 1, wherein the component is configured to allow adjustment of the relative positions of the first and second wall portions.
3. Gas turbine engine component according to claim 2, wherein at least one of the wall portions forms part of a separate bracket member that is fastened to the ring element and to the composite vane.
4. Gas turbine engine component according to claim 3, wherein the separate bracket member is fastened to the ring element by means of a fastening device that allows its position to be adjusted.
5. Gas turbine engine component according to claim 1, wherein the first insertion member extends in the first hole along an axial direction thereof.
6. Gas turbine engine component according to claim 1, wherein the first insertion member is a bushing member.
7. Gas turbine engine component according to claim 6, wherein the component comprises a fastening member that extends in an axial direction through the first hole and that the bushing member extends at least partly around and along the fastening member.
8. Gas turbine engine component according to claim 1, wherein the first insertion member is an elongated fastening member, such as a bolt or a rivet.
9. Gas turbine engine component according to claim 1, wherein a third hole is arranged in-between the first and second holes, wherein the third hole is adapted to receive a third insertion member, and wherein the component is arranged such as to, with regard to the third hole, provide a loose fit with a radial play for the third insertion member in the first and second wall portions and to provide a tight fit in the in the composite vane.
10. Gas turbine engine component according to claim 1, wherein the tight fit corresponds to a radial play of \u22660.1 mm and that the loose fit corresponds to a radial play of >0.3 mm.
11. Gas turbine engine component according to claim 1, wherein the component comprises an inner ring element and an outer ring element connected by the plurality of circumferentially spaced load carrying vanes.
12. Gas turbine engine component according to claim 1, wherein the component is configured to define a gas flow in a gas turbine engine.
13. Gas turbine engine component according to claim 1, wherein the first and second wall portions are made of a metallic material.
14. Gas turbine engine, wherein it comprises a component according to claim 1.
15. Gas turbine engine component according to claim 12, wherein the gas turbine engine is a turbo jet engine.