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公开(公告)号：EP0937303A1
公开(公告)日：1999-08-25
申请号：EP98942855.0
申请日：1998-09-09
摘要： An electric power cable of the kind having at least one metallic conductor, optionally a conductor screen of semiconductive material, and insulation all enclosed in an earth screen formed by wires or narrow tapes and a sheath formed by polymeric material is characterised by a sheath construction including a first extruded polymeric layer which encloses the earth screen of the cable without filling the gaps between the components thereof (the wires or strips), a second extruded polymeric layer enclosing the first and between them a moisture barrier laminate having a metal foil layer coated on one of its major faces with a polymeric material compatible with the material of the extruded layer it contacts and bonded to that extruded layer only. That increases the resistance of the cable to impact, compared with constructions in which a moisture barrier foil layer is applied directly over the screen wires, and increases flexibility and reduces cost compared with constructions in which the foil is bonded to both extruded layers.
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公开(公告)号：EP0909401A1
公开(公告)日：1999-04-21
申请号：EP97928351.0
申请日：1997-06-25
IPC分类号： G02B6
CPC分类号： G02B6/483 , G02B6/4422 , G02B6/486
摘要： A method of forming a joint in an optical line that extends along a phase conductor (1) of a high voltage overhead power transmission system, comprises: (i) forming a length of optical cable (10) which comprises a plurality of optical fibres; (ii) encapsulating the optical fibres; (iii) providing an intermediate region of the length of optical cable with an outer, non-tracking jacket (12) so that a part of the length of optical cable extends from each end of the outer, non-tracking jacket; (iv) installing the jacket so that it extends between phase potential and any other potential to which the cable will be subjected; and (v) connecting one end of the optical fibres of the optical cable to fibres in the optical line of the phase conductor (1), and connecting the other end of the optical fibres of the optical cable to another optical line. The parts of the length of the optical cable that extend from each end of the outer, non-tracking jacket (12) have a sufficient length that connections can be formed between the optical fibres and the optical lines at points remote from regions in which the cable extends along high electrical field gradients. This has the advantage that the optical fibres of the assembly which, in use, will extend between the potential of the phase conductor and earth can be encapsulated in the factory under controlled conditions, and conventional means may be employed to connect the cable.
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公开(公告)号：EP0877911A1
公开(公告)日：1998-11-18
申请号：EP97902437.0
申请日：1997-01-31
CPC分类号： G01B7/14 , H01B11/206
摘要： Capacitance transducer apparatus, for example for measuring blade tip clearance in a jet engine of gas turbine, comprises an oscillator (14) connected by a cable (6) to a capacitance means such as a probe (4). The cable is tri-axial comprising an inner conductor (22), an outer protective layer (24) and an intermediate layer (26) between the outer layer and inner conductor, the inner conductor, intermediate layer and outer layer all being electrical conductors. The intermediate layer (26) consists of a material that is different to that forming the outer layer and is of relatively high electrical conductivity. The resistance of the intermediate layer is preferably less than 1 Ohm metre-1, and especially les than 0.1 Ohm metre-1, which may be achieved by forming the intermediate layer from a nickel based material, and especially from pure nickel. The reduction in the intermediate layer resistance can lead to higher sensivity of the apparatus by enabling any guard driver amplifier (165) in the apparatus to drive the capacitance over the full length of the cable.
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公开(公告)号：EP0870374A1
公开(公告)日：1998-10-14
申请号：EP96942480.0
申请日：1996-12-19
发明人： HAIGH, Neil, Richard
CPC分类号： H04B10/071
摘要： An optical line system comprises: (i) an optical fibre that includes a plurality of reflectors, for example Bragg gratings, located at different positions along the optical fibre; and (ii) a monitoring arrangement located in the region of one end of the optical fibre for monitoring the system by an optical reflectometry method in which light is reflected by the reflectors. The system is characterised in that at least two of the reflectors have reflectivities that differ from one another, the reflector that is more distant from the monitoring arrangement having a higher reflectivity than the Bragg grating that is nearer to the monitoring arrangement. Preferably the reflectivities of the reflectors increases as the distance from the monitoring arrangement increase, the reflectivities preferably having the relationship (I) Rn-1=(2T2Rn+1)-(1+4T2Rn)?1/2/2T2R¿n where: Rn is the reflectivity of the n th reflector from the monitoring arrangement, Rn-1 is the reflectivity of the (n-1)th reflector from the monitoring arrangement, and T is the transmission coefficient of any branch that may be present between the (n-1)th and the n th reflector (and is unity if no such branch exists). Such a system has the advantage that the signal-to-noise ratio of the most distant reflectors is increased by the greatest extent so that differences in the signal-to-noise ratio of different reflectors is reduced.
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公开(公告)号：EP0838040A1
公开(公告)日：1998-04-29
申请号：EP96924063.0
申请日：1996-07-10
IPC分类号： G02B6
CPC分类号： G02B6/4464 , G02B6/30 , G02B6/4438 , G02B6/4463 , G02B6/502
摘要： A method is described of installing a lightweight (preferably less than 10 g/m) optical fibre unit into a tube by pulling using a pulling member. The pulling member may be attached to the pulling member by a braided sheath, or the pulling member itself be a braided tube.
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公开(公告)号：EP0539072B1
公开(公告)日：1997-04-23
申请号：EP92309260.5
申请日：1992-10-12
IPC分类号： C04B35/00
CPC分类号： C04B35/4504 , H01L39/126 , Y10S505/776 , Y10S505/779
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公开(公告)号：EP0651909B1
公开(公告)日：1997-03-19
申请号：EP93916112.1
申请日：1993-07-21
CPC分类号： C01G21/006 , C01P2002/30 , C01P2002/34 , C01P2002/72 , C01P2002/76 , C01P2002/77 , C01P2002/78 , C01P2002/85 , C04B35/4504 , H01L39/126 , Y10S505/778 , Y10S505/779 , Y10S505/783
摘要： A superconductor that is free of Tl and may have a sharp transition from metallic to superconducting behaviour at temperatures up to about 80K at least is characterized by the formula (PbaA1-a)(SrbBa1-b)2(CacB1-c)Cu2O7 in which at least half the A atoms are Hg and the remainder, if any, are selected from one or more of Zn, Cd, Tl, Sc, Mg, and Cu; B is selected from Y and the rare earth elements; a is from 0.3 to 0.7; b is from 0 to 1; and c is from 0.2 to 0.5 (all limits inclusive).
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公开(公告)号：EP0458608B1
公开(公告)日：1996-07-31
申请号：EP91304613.2
申请日：1991-05-21
发明人： Longhurst, Philip C.
CPC分类号： G02B6/4249 , G02B6/30 , G02B6/3825 , G02B6/3851 , G02B6/3865 , G02B6/3885 , G02B6/3893
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公开(公告)号：EP0706590A1
公开(公告)日：1996-04-17
申请号：EP94915669.0
申请日：1994-05-23
发明人： GOSLING, Henry Cyril
CPC分类号： H01B13/0235 , D07B3/005
摘要： A method of manufacturing a stranded assembly of flexible elements for example an electrical or optical cable in which the lay of the elements is repeatedly reversed along the length of the assembly, comprises: (i) feeding the elements (X) into one end of a guide, the guide having an upstream region in which one internal lateral dimension thereof constrains the strands to lie in side-by-side relationship and in which an orthogonal internal lateral dimension is greater than the total width of the elements, and a downstream region in which the elements are forced into a generally cylindrical geometry; and (ii) removing the elements from the other end of the guide in the form of a stranded assembly (Y). The elements are fed into the guide at a higher speed than they are removed from the guide so that they are forced into a serpentine configuration in the guide, and in the downstream region the serpentine configuration is converted into a generally helical one in which the lay of the elements is repeatedly reversed.
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公开(公告)号：EP0691434A1
公开(公告)日：1996-01-10
申请号：EP95304745.3
申请日：1995-07-07
IPC分类号： E02D5/52
CPC分类号： E02D5/523
摘要： A concrete pile section (1,2) comprises an elongate body of reinforced concrete having a socket (5) at its top end and a spigot (6) at its bottom end which are shaped and relatively dimensioned such that when the spigot (6) at the bottom of one such section (1,2) is fully inserted into the socket (5) at the top of another such section (1,2) to form a joint there is an interference fit between the spigot (6) and socket (5) in at least two zones (7,8) spaced apart along the length of the joint but a clearance fit in at least a third zone (9) spacing the said two zones (7,8). The socket (5) is reinforced by at least one hoop member (13,14) in each of these two zones (7,8), preferably by a separate circular hoop member (19,20) embedded in the concrete in each of the zones (7,8). If desired, a resinous adhesive or a non-shrink grout may occupy the clearances in the third zone (9) and/or elsewhere. Even without such adhesive, however, the interference fit in the first and second zones (7,8) creates an immediate frictional engagement so that installation of the pile can continue immediately.
摘要翻译： 混凝土桩部分（1,2）包括细长的钢筋混凝土体，其顶端具有一个插座（5），底部的一个插口（6）的形状和尺寸相对较大，使得当插头（6） 在一个这样的部分（1,2）的底部在另一个这样的部分（1,2）的顶部完全插入到插座（5）中以形成接头，在插头（6）和插座 （5）在沿着所述接头的长度间隔开的至少两个区域（7,8）中，但是在至少第三区域（9）中间隙配合，以间隔所述两个区域（7,8）。 插座（5）由这两个区域（7,8）中的每一个中的至少一个环形构件（13,14）加强，优选地通过嵌入混凝土中的每一个中的单独的环形箍构件（19,20） 区域（7,8）。 如果需要，树脂粘合剂或非收缩浆料可以占据第三区域（9）和/或其他地方的间隙。 然而，即使没有这种粘合剂，在第一和第二区域（7,8）中的过盈配合产生立即摩擦接合，使得桩的安装可以立即继续。
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