An electrical assembly including electrical raft having electrical conductors embedded in a rigid material is provided. The electrical assembly has an electrically conductive screen layer. The electrically conductive screen layer provides electromagnetic protection to the electrical conductors. The
An electrical assembly including electrical raft having electrical conductors embedded in a rigid material is provided. The electrical assembly has an electrically conductive screen layer. The electrically conductive screen layer provides electromagnetic protection to the electrical conductors. The electrically conductive screen layer is electrically connected to a mounting fixture, which in turn may be electrically connected to an apparatus on which the electrical assembly may be mounted. The electrical raft is used to transport electrical signals (which may be, for example power and/or control signals), for example around a gas turbine engine.
대표청구항▼
1. A rigid electrical raft assembly having a rigid electrical raft, the rigid electrical raft assembly comprising: a rigid material having multiple electrical conductors embedded therein; andan electrically conductive screen layer, wherein:the rigid electrical raft assembly further comprises a mount
1. A rigid electrical raft assembly having a rigid electrical raft, the rigid electrical raft assembly comprising: a rigid material having multiple electrical conductors embedded therein; andan electrically conductive screen layer, wherein:the rigid electrical raft assembly further comprises a mounting fixture for attaching the rigid electrical raft assembly to a mounting structure of an apparatus;the mounting fixture is in electrical contact with the electrically conductive screen layer;the mounting fixture comprises an electrically conductive raft fastner that passes through the rigid electrical raft;one end of the electrically conductive raft fastener is in electrical contact with the electrically conductive screen layer; andanother end of the electrically conductive raft fastener extends through the rigid electrical raft for connection with said mounting structure of said apparatus. 2. The rigid electrical raft assembly according to claim 1, wherein the electrically conductive screen layer is at least partially embedded in the rigid material. 3. The rigid electrical raft assembly according to claim 1, further comprising an electrical unit mounted to the rigid electrical raft, wherein: the electrical unit has a casing, at least part of the casing being electrically conductive; andthe casing of the electrical unit is electrically connected to the electrically conductive screening layer. 4. The rigid electrical raft assembly according to claim 3, wherein: the rigid electrical raft comprises an electrical contact region at which the electrically conductive screen layer is exposed at a surface of the rigid electrical raft; andthe electrical unit is mounted to the rigid electrical raft such that an electrically conductive portion of the casing is in direct contact with the electrically conductive screen layer at the electrical contact region. 5. The rigid electrical raft assembly according to claim 3, wherein: the rigid electrical raft comprises an opening having an electrically conductive insert;the electrically conductive insert is electrically joined to the electrically conductive screen layer; andthe electrical unit is mounted to the rigid electrical raft using an electrically conductive fastener that engages with an electrically conductive portion of the casing and is inserted into the opening so as to be in electrical contact with the electrically conductive insert. 6. The rigid electrical raft assembly according to claim 5, wherein the electrically conductive insert is a threaded insert, and the electrically conductive fastener is a corresponding threaded fastener. 7. The rigid electrical raft assembly according to claim 1, wherein the mounting fixture comprises: an anti-vibration mount; anda conductive strap fixed across the anti-vibration mount so as to provide electrical connection across the anti-vibration mount. 8. The rigid electrical raft assembly according to claim 7, wherein: the anti-vibration mount comprises a resilient core sandwiched between upper and lower conductive surfaces;a first end of the conductive strap is in electrical contact with a lower conductive surface of the anti-vibration mount, the anti-vibration mount being in electrical contact with the electrically conductive screen layer; anda second end of the conductive strap is in electrical contact with an upper conductive surface of the anti-vibration mount. 9. The rigid electrical raft assembly according to claim 8, wherein: the mounting fixture comprises an electrically conductive raft fastener that passes through the rigid electrical raft;one end of the electrically conductive raft fastener is in electrical contact with the second end of the conductive strap; andanother end of the electrically conductive raft fastener extends through the rigid electrical raft for connection with said mounting structure of said apparatus. 10. The rigid electrical raft assembly according to claim 1, wherein the rigid material is a rigid composite material. 11. An apparatus comprising: the rigid electrical raft assembly according to claim 1; andsaid mounting structure for connecting the rigid electrical raft assembly to a remaining portion of the apparatus, wherein:the mounting fixture of the rigid electrical raft assembly is mechanically and electrically connected to the mounting structure of the apparatus, thereby electrically connecting the electrically conductive screen layer to the remaining portion of the apparatus. 12. A gas turbine engine comprising the apparatus of claim 11. 13. The gas turbine engine according to claim 12, wherein the rigid electrical raft assembly is a first engine installation component, and the gas turbine engine further comprises: a second engine installation component having electrical conductors; andat least one flexible cable connected between the rigid electrical raft assembly and the second engine installation component so as to electrically connect electrical conductors of the rigid electrical raft assembly with electrical conductors of the second engine installation component. 14. A method of assembling the apparatus according to claim 11, the method comprising: preparing the rigid electrical raft assembly, andelectrically and mechanically connecting the prepared rigid electrical raft assembly to the remaining portion of the apparatus/gas turbine engine by fastening the mounting fixture of the rigid electrical raft assembly to the mounting structure of the apparatus/gas turbine engine. 15. A rigid electrical raft assembly having a rigid electrical raft, the rigid electrical raft assembly comprising: a rigid material having multiple electrical conductors embedded therein;an electrical unit mounted to the rigid electrical raft; andan electrically conductive screen layer, wherein:the rigid electrical raft assembly further comprises a mounting fixture for attaching the rigid electrical raft assembly to a mounting structure of an apparatus;the mounting fixture is in electrical contact with the electrically conductive screen layer,the electrical unit has a casing, at least part of the casing being electrically conductive, andthe casing of the electrical unit is electrically connected to the electrically conductive screening layer. 16. The rigid electrical raft assembly according to claim 15, wherein: the rigid electrical raft comprises an electrical contact region at which the electrically conductive screen layer is exposed at a surface of the rigid electrical raft; andthe electrical unit is mounted to the rigid electrical raft such that an electrically conductive portion of the casing is in direct contact with the electrically conductive screen layer at the electrical contact region. 17. The rigid electrical raft assembly according to claim 15, wherein: the rigid electrical raft comprises an opening having an electrically conductive insert;the electrically conductive insert is electrically joined to the electrically conductive screen layer; andthe electrical unit is mounted to the rigid electrical raft using an electrically conductive fastener that engages with an electrically conductive portion of the casing and is inserted into the opening so as to be in electrical contact with the electrically conductive insert. 18. The rigid electrical raft assembly according to claim 17, wherein the electrically conductive insert is a threaded insert, and the electrically conductive fastener is a corresponding threaded fastener. 19. An apparatus comprising: the rigid electrical raft assembly according to claim 15; andsaid mounting structure for connecting the rigid electrical raft assembly to a remaining portion of the apparatus, wherein:the mounting fixture of the rigid electrical raft assembly is mechanically and electrically connected to the mounting structure of the apparatus, thereby electrically connecting the electrically conductive screen layer to the remaining portion of the apparatus. 20. A gas turbine engine comprising the apparatus of claim 19.
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