BUSHING ARRANGEMENT

Abstract: A bushing arrangement for passing at least one cable through an opening in a wall and the like whilst providing protection against electromagnetic overtension and/or interference, characterized in that said bushing arrangement comprises an electrically conductive tape, which is in contact with an electrically conductive cable shielding of said at least one cable being passed through and which functions to earth said cable shielding.

Description: BUSHING ARRANGEMENT The invention relates to a bushing arrangement for passing at least one cable through an opening in a wall, plating, partition and the like (such as a bulkhead of a ship, for example) whilst providing protection against electromagnetic overtension and/or interference . Hereinafter, the term "wall" will be used for the sake of simplicity, whilst said term is understood to include other partitions as well . Such a bushing arrangement is disclosed in Dutch patent application no. 1011718 in the name of the present applicant. The bushing arrangement that is disclosed therein consists of a steed bushing arrangement fitted in a wall opening, through which a number of single-core or multiple-core cables are passed. The cables are stripped of their sheathing along a suitable part of their length, so that said cables can locally come into electrically conductive contact with their environment. The aforesaid longitudinal parts of the cables are then embedded in an electrically conductive moulding paste so as to effect electrical conduction between said cables and said bushing arrangement, after which the wall opening is filled up with a suitable sealing compound. A rubber hose member may be fitted round each cable before the moulding paste is provided, whilst the remaining space in the wall opening will be filled with similar hose members in that case. One drawback of the bushing arrangement that is disclosed in the aforesaid Dutch patent application is the fact that it has become apparent in practice that in some cases the moulding paste exhibits a relatively high electrical resistance value, in the order of about 100 - 100 Ohm, after curing. In particular this means that the degree to which electricity can flow away to earth via the rr Φ φ H- φ TJ P Φ rr Hi Ω H- O Ω Ω H- 0J H φ 3 i CO 0J 1-9 0J 0J TJ 0J 3 OJ >Q P OJ ii CQ tQ t d H- P O P " Hi O O CO t P t Φ Φ ii r LQ TJ ii Ω. 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O 0J I- 1 H- O H- Φ Q Φ Ω l- 1 P Ω Φ O H- H CQ O O 3 Ω H cr P •<; P- 0J 3 ω ii rr o Ω o CD 0 ) rr CQ P O o O P 0J Ω O tr φ Ω, Hi H H- Hi O P φ Ω t- 1 tr P H P tr 3 φ Φ φ Ω 0J P s Ω^ P CD • rt tr rt rt Φ φ Ω P O O OJ Ω Φ CQ 0 ) CD P P * , rr CD Ω O tr o t LQ TJ CD Ω P P Ω rr tr tr tQ rr rr tr H- d H- tr rt rt H o LQ LQ φ Φ 0J O H H- 0 Ω H- Ωi OJ H- rr OJ H P φ CQ P φ Ω < H- O H- rt tr tr H- P ii <! O &. P rr P P Or Ω P" P OJ . φ Ω Φ rt φ P <! Φ rr I TJ 3 Ω Ω, φ rt Φ D-, H- rr Ω O P" p OJ rr P OJ O CQ c sd I-"- IQ H- Φ P Ω LQ H TJ φ CO P 0 O rr φ rr rr OJ H- OJ P Hi P J <! rr P rr rt tr ii Φ H H H- H rt Ω 0J Ω P CD H- Hi φ Φ H Ω O H- Φ 0J 0J Φ Φ t rr rr c OJ o o Φ r P P P φ H Φ l rt 0J ϋ Ω CD , H rr tr P H- H- tr P rr rr p H O φ H Φ OJ ' t rr Ω Φ tr Hi tr Φ Φ tr to O H- Φ i t Φ Ω Φ Ω P CQ Φ H- , 0J 0J Φ cr Φ 0J H- 0J φ H- P I- 1 Φ OJ P rr H. H rr CQ Φ Φ H- Ω M- H cr P P i LQ ti Hi ii ft o Φ CQ rr Ωi H- Φ ii •i rr !- ■ Ω 0J X P o LQ H- CO Φ 0J LQ rt tr TJ P rt CD H- φ O P Φ H- OJ P. rr 3 LQ Φ IT LQ tr Φ P t . r P H- ii φ ii tr tr Φ i OJ Ωi P Ω Λ Ω \-> CQ • d LQ H- 3 rr H- Ω P OJ Φ O OJ H- H- Φ Ω A ) H CQ Φ P O Φ I- 1 CQ t-T CQ Ω Φ P Φ CQ H H- tr rt H3 rt Ω Φ P rr tr Φ Hi Φ 0 ) OJ 3 φ d (- ■ φ tr tr P O LQ ft ii P P Φ tr tr ii h- 1 0 OJ P rr P OJ O 0J 0J H- rr Ω, 0J O Ω φ H- P-. H O φ TJ H to CQ rr P- Q, LQ Φ Hi Φ H- C P rr tr rt CO tr P OJ 0 P H o I- 1 , CQ Ω LQ tr H- p- CQ 0J P H- CD 0J rr P Φ p- H Ω, rr Φ φ P O CD LQ t- 1 Ω CO tr CO rr Φ H- H- H- 3 LQ P 3 φ Φ H- P P P O Φ Φ a- 0J Ω Ω CQ P P P Φ rr (braid) of the respective cables that are passed through. According to the invention, said external undesirable em fields and pulses will flow away to earth along the electrically conductive shielding of a cable being passed through, via the electrically conductive tape. In particular, said electrically conductive tape is at least partially wound round the electrically conductive cable shielding in the operative condition. It is noted that within the framework of the invention the term "cable" is understood to include an electrically conductive conduit, tube, pipe of the like, for example a metallic tube or pipe, with the present tape being in electrically conductive contact therewith in the operative condition. In one preferred embodiment of a bushing arrangement according to the invention, the electrically conductive tape. is wound round the electrically conductive cable shielding near its one end, whilst it is in electrically conductive contact with an electrically conductive bushing housing (made of a metal, for example) that is fitted in the opening in the wall. In another preferred embodiment, the earthing of the electrically conductive cable shielding is effected by means of said electrically conductive tape by providing an electrically conductive material on at least one open side of the wall, which material is in electrically conductive contact with the tape. Said electrically conductive material is at least substantially made up of several pieces of electrically conductive tape material, whether or not folded, which have been placed into said opening, and/or of several electrically conductive sleeve means or hose members which have been placed into said opening, which hose members or sleeve means preferably extend in the same direction as said at least one cable being passed through. In another preferred variant, said electrically conductive material is the graphite-containing moulding paste that is known from the aforesaid Dutch patent application no. 1011718. In another preferred embodiment of a bushing arrangement according to the invention, the electrically conductive tape and/or the electrically conductive sleeve means is/are substantially made of an electrically conductive rubber. Said rubber has been made electrically- conductive in particular by chemical means, in particular through the addition thereto of carbon particles, preferably in the form of carbon black. In particular, said rubber is EPD rubber, whilst said carbon particles are preferably concave shell-shaped, especially of the type "Ketjenblack EC" 300J or 600 JD ™. These known types of carbon black known under the commercial name of "Ketjenblack" have a unique morphology in comparison with conventional types of carbon black, which renders them exceptionally suitable for the present electrically conductive application. The abbreviation EPDM stands for Ethylene/Propylene/Diene/Monomer. It is noted that also other elastomers or plastomers can be used as materials for said tape and said sleeve means . In another preferred embodiment of a bushing arrangement according to the invention, the electrically conductive tape is a metal tape. Preferably, the electrically conductive (rubber or metal) tape is flexible, that is, deformable, so that it can readily be passed along other cables that are passed through the bushing arrangement. In another preferred embodiment of a bushing arrangement tr Φ OJ TJ •-3 OJ rt o CD h- 1 OJ OJ OJ rr 3 CQ rt CD CD ^ J μ- 01 O ii OJ 3 P J rt 0i P P OJ t i H- J φ H- Ω P hi Hi tr φ OJ tr 01 Φ OJ Ω P P CD TJ O TJ 3 J to hi 0J Ω CQ Φ i CD φ ii LQ Φ OJ μQ Ω hi ft Φ H- hi 3 < (- ■ Ω rt rr P TJ Ω P Φ TJ Ω tr Ω CQ OJ tr P h- 1 P O OJ OJ Φ Ωi 0 φ Φ - 1 0 OJ Φ rt μ- P h- 1 . — . rt 0 ) Hi Φ O H- ft rt H- H- P rt H- H- H- ii P P h{ r-> φ P ii hi P ii o 3 Pi μ- OJ o h- 1 Φ ii p ii tr P P iQ P P P Ωi i O LQ OJ hi CD LQ a. OJ o Ωi O Hi P Ω rt hi hj tr P. 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Φ CQ O h- 1 Φ tr Φ ii LO LO N) to H H LΠ O Lπ o Lπ O tn rt 3 Φ <! μ- TJ φ rt OJ μ- TJ s: Ω H rt rr Pi Ω tr μ- ti φ h- 1 0i CQ μ- o OJ 0J ti P μ- 01 O P tr tr Φ O O rt OJ Φ hj OJ ti Φ TJ φ to Φ P φ Φ rt P P i ( ^ Ω LQ OJ μ- rt Ω Φ rt Ω i •rl hi Φ μ, CQ TJ Φ φ ft φ h- 1 rt P μ- rt 3 φ φ P μ- rt φ ti to μ- O H H hj 0J Ω H 1 0i 0i CQ o Ω LQ H Hi 3 Φ P CO P to μ- φ TJ φ μ- 1 μ- o i Ωi TJ rt P 0J O μ- - Q CO OJ Ω rt OJ Φ OJ φ Ω - Φ H Φ μ- ii Pi ϋ P μ- 3 μ> OJ tr Pi ti CO 0J O -J P <! Φ Φ Φ Φ ^ to cr Φ en h- 1 0J *<: H rt - <! O Hi μ- φ tr h-> . h- 1 p o tr μ- Hi O P Lπ P rt Φ μ- •<: CQ ^ Φ rr >< tsi CQ Hi CQ 3 • » J W tr ii P *τ] T) rt OJ P- tr • rt 01 0J 3 O Φ Φ CO rt M μ- Ω tr μ- tr Φ Ω tr μ- rt μ> rt tr Φ CQ tr r O s! P o 0J Pi o Ω O M φ Pi 0i " Φ 0 Φ Ω ^ Φ OJ P rt to o φ P J TJ ii CO = O 0J TJ i tr φ P Ωi D to tr Φ £ μ- φ W 3 ti r Ωi J P O φ P Φ P 3 OJ o tr 0J H Φ ti P * CO O ^ Ω Hi Hi 3 φ Ω Ω 3 CO μ> μ- 3 00 φ Φ O CQ Hi rt 0 Φ Ω rt rt ti φ φ o Φ M Ω Hi μ- rt ii 3 r ti μ- P CO OJ 3 =: φ rt tr J ft OJ <! tr Φ CJ" μ- μ- <! cr φ 3 , — rt ii tr ti 0J rt tr Φ φ - Φ O Ω φ tr H Φ l Φ Φ o CO TJ H tr P φ J hi P OJ Φ φ 3 μ- μ- ii Hi O 1 φ Φ P Ω Ω rt CQ cr H Ω tr Q r Ωi to μ> CO CO £ TJ rt 0 OJ OJ S- H ; rt Φ P μ- rt H μ- tr cr hi rr P tr TJ μ> μ- • • rt ϋ ti ti μ- CO μ> tr ^ rt OJ OJ Ω φ * rt Φ σx rt rt tr μ- CQ φ o TJ en φ μ- TJ hj 01 CO OJ Φ tr Ω tr 0J Ω • 0 H o Φ 1 tr φ H Ω H OJ 0 φ rt 0J en OJ CO O TJ to P Ωi CO P 03 rt CO o P CQ P h- 1 CQ • — φ Hi ti - tr Φ rt 0 Ωi rt Ω. OJ tr H μ- to Ωi Φ Hi φ OJ ≤ tr μ- ^ φ P 0J < < P μ- O 0i CD H 0 h- 1 TJ ft Oi tr Φ OJ CQ O φ Ω P. to Ω P 0 P φ LO ti φ Φ tr TJ μ- r CO hi rt μ- Ω φ TJ P P - 3 Ωi ti TJ Ω 2 £ μ- rt tr o 0i O φ rt CQ φ o tr Φ rr o J tr < μ- Φ P ft Ωi CD o H 01 P Φ P μ- Φ o P μ- P Φ o Φ Pi tr Pi CQ P φ 0J rf^ μ- rt LQ Ω μ- P P Φ CQ P P P φ μ- μ- φ Ω TJ Ωi Φ tr Oi o Φ i Ω tr Ω Ω rt tr rt TJ 0J H 3 P rt P Φ μ- OJ 0 3 r tr μ- μ j 0 ii H ϋ P Ln Φ rt rr W OJ CQ rt CD P tr H 0J μ- o O Φ TJ μ- μ- Φ Φ P tr P TJ P O CQ Pi <J O P φ Ω Ω £ Hi rt Φ μ- o φ ii O Φ Ω Φ Φ Φ rr P 0J 0J ? P co S Φ 0J Hi tr 0J rt O * P P Ω P μ- tr P H O CQ H 3 3 O CQ μ j rt 0 01 Ω P P CO o r Pi rt P tr cr OJ Φ P μ- •<; • s, tr rt to Φ P tr μ- OJ CQ μ- 0 rt 3 O CD Ωi P - 1 μ- Ω. tr Oi P Oi φ 0J TJ μ- Φ P Φ cr ti Φ φ Φ O P μ- * Pi P 3 Φ P H Φ P - P Φ P μ- φ Pi φ LQ Pi μ- H Hi o P CO CQ P hi rt H μ- OJ CQ O Hi P i LQ tr Φ O LO P H μ j φ r rt 0 ti • CQ μ» Ωi ϋ O ■ ; tr CO 0J en Φ Φ Φ 00 o P. provided on that side of the wall opening 1 (Figure 7) . It is also possible, of course, to fit the hose members 16 and/or the pieces of tape 17 on either side of the wall opening 1. In particular tape 10 and putty 18 provide an airtight seal of opening 1, thus preventing corrosion of the electrically conductive cable shielding 8. The present bushing arrangement is based on the use of two types of hose members, therefore: hose members 11, 12, 13, 14 of a fire resistant (non-vulcanized) rubber on the one hand (with hose members 11, 12, 13 being fitted around cables 4, 5 and 6, respectively, and hose members 14 functioning as fillers) , and hose members 16 of an electrically conductive rubber material corresponding to that of tape 10 on the other hand. It is also possible, of course, to form both types of hose members of said electrically conductive rubber. In addition, it is possible to use massive hose members 14, 16 of vulcanized rubber instead of or in addition to the hollow hose members 14, 16. Such massive hose members in fact form bar material in that case. From the figures it will be understood that the terms opening in the wall, wall opening or the like as used herein, when used in conjunction with a bushing arrangement, are understood to mean the opening in the bushing housing, the bushing housing opening and the like. It is noted that the invention is not restricted to the embodiment as shown in the drawing, but that it also comprises other embodiments that fall within the scope of the appended claims.

Claims: LO LO to t H μ> LΠ o LΠ o LΠ o LΠ LΠ ιt to to H O o P Ω CO TJ 0 0J φ rt tr tr i H d μ- Hi Φ CQ p 0 tr LQ h- 1 rt μ- P. tr P φ ti LQ Ωi O d 0J LQ hi ≤ tr hi tr 0J μ- OJ P Ω • P LQ tr φ o 3 tr TJ φ 0 ) Φ P <! P rt Φ μ- P Hi tr LQ O Φ ti Φ μ- P P TJ 0J TJ 0J CO h- 1 CQ OJ £ μ- Ω 0J P Φ h- 1 LQ Ωi h- 1 0J μ- 0J rt P P rr o Ω- h- 1 Φ rt 0J CQ tr CQ OJ φ rt μ- Ωi O μ- p Φ φ 6. A bushing arrangement according to claim 4 or 5, wherein said electrically conductive material is at least substantially made up of several electrically conductive sleeve means which have been placed into said opening. 7. A bushing arrangement according to any one of the preceding claims 1 - 6, wherein said electrically conductive tape and/or said electrically conductive sleeve means is/are substantially made of an electrically conductive rubber. 8. A bushing arrangement according to claim 7, wherein said rubber has been made electrically conductive through the addition thereto of carbon particles, preferably in the form of carbon black. 9. A bushing arrangement according to claim 8 , wherein said carbon particles are concave, shell-shaped particles. 10. A bushing arrangement according to claim 8, wherein said carbon particles are of the type "Ketjenblack EC" 300J or 600 JD ™. 11. A bushing arrangement according to any one of the preceding claims 7 - 10, wherein said rubber is EPDM rubber. 12. A bushing arrangement according to any one of the preceding claims 1 - 6, wherein said electrically conductive tape is a metal tape. 13. A bushing arrangement according to any one of the preceding claims 1 - 12, wherein said electrically conductive tape is flexible. LO to ιo H H O LΠ o LΠ O LΠ μ> μ> μ> μ> μ> ∞ ι en LΠ d^. φ O Φ Ω H OJ OJ TJ O O 0J TJ HI £ O ≤ Hi CO TJ OJ Ω TJ OJ P o Ω P ii TJ P P ti μ- tr P tr μ- TJ ii tr O ii ti φ Φ P Ω P. o φ 3 i φ tr ti Φ tr φ μ- 0J Φ tr o P Φ tr rt Ω Pi O rt P Φ OJ Ω d Φ t d Ω h- 1 Ω Ω d d Ωi Ω d t Ω rt d Ω i O Φ μ- ft rt 0 Φ CQ Φ CO Ω t Φ Φ Φ CD rt d Φ CD μ- OJ h{ Ω tr Ω hi Ω P tr ii Pi tr ti μ- tr 0J P. Ωi tr Ω Pi tr p tr μ- ft OJ μ- rt LQ 0 μ- μ- Φ P μ- tr φ μ- μ- μ- ΓΛJ r μ- μ- LQ μ- 1 Ω μ- μ, P μ- μ- i Φ h-* P P CD P μ- 1 X d P P P o μ- P P Φ OJ <! J LQ P O μ- 0i μ- LQ Q μ- to LQ Φ rt TJ Q CQ < LQ LQ μ- Φ Ω rt P P Hi CO Λ CQ Oi Φ rt 3 Φ Ct tr h- 1 rt rt Φ o rt P Ω 0i rr μ- 0J tr P tr Ω 0i 3 Ω OJ . Φ • ; rt Φ 0 hi OJ 0J ti μ- μ. 0i ti Φ Pi μ- Φ hj rt h- 1 ti μ- OJ hj Hi LQ O Pi 0i hi P ti μ- rt OJ hj 0J 0i ti P Ω TJ μ- OJ Φ OJ % TJ P μ- 0J rt OJ 0J P μ- tr 3 > μ- 0J TJ TJ μ- 0J LQ o Φ N P ti μ- 0J 0J Φ μ. 3 P rt P iQ P 0J 3 P hi Φ 3 P P Φ > < φ P h- 1 CQ Φ CO LQ CO LQ CQ CD LQ Φ CD LQ TJ Ωi μ- Pi P CD h-> CD O TJ φ h- 1 φ TJ rt Φ φ Hi tr φ OJ d ω o Ω rt μ- TJ Φ 3 Φ Φ 3 0J tr < 3 Φ oi H 3 CO Ω μ- P φ J P Φ h- 1 φ Φ 0J Φ CQ φ Φ O φ H to φ CD rt tr P Φ - Φ P LQ P P <! CO P to ii TJ 1 P 0J P φ μ- hi Pi Φ rt Φ rt rt φ CO OJ Φ rt tr 0i rt Ωi <! 0 rt o d Φ 0J CQ P H Pi 0J -> P M H Φ d tr Hi CD Ω ft rt μ- rt en 0J 3 O 0J 3 μ- |J 0J ^ Ω to 0J rt LQ oi H- r tr P. - Ω Φ P Ω rt φ Hi P - Ω o - Ω tr CD tr rt rt P ii Φ h- 1 φ TJ Ω 3 Φ Ω tr μ- LQ Ω 0J P Ω ti tr rt tr LQ O Φ d £ O tr O ii Pi H £ O tr rt £ O O μ- μ- φ 3 0J 0 rt tr hi Φ Ω hj o μ- Φ μ- tr ti o 0i tr ii d φ μ- P OJ 0J μ- ω Hi rt φ Ω- ii 0J Pi d ii CQ Φ Ω, d Ω Φ i LQ h-> P TJ LQ rt *<: i μ- tr μ- LQ Φ ii ti μ- rt rt ti μ- tr Ωi rt d ti tr P Φ rt Φ P h- 1 P tr Ω Φ OJ Φ P φ P μ- 0 to φ d Φ O tr μ- μ- LQ Φ LQ • rt CQ rt μ- LQ £ μ- LQ Hi P φ Ω CO r ≤ P Φ C Q P μ- μ- P o μ- P 0 LQ Ω φ tr μ- tr Φ rt μ- rt O co μ- 1 rt Pi rt hi 0 OJ Ωi μ- Ω μ- 0 Co OJ O CO O P rt φ rt O 3 r CD O 0 P P μ- P H Ω TJ Φ 0i 0J tr 3 tr 01 ft Hi rt P LQ O ω 0J φ 0 ) tr 0J J Ω 0J P CO Φ 0J μ- OJ tr OJ Φ CQ <! rt tr P Φ P 0J CO rt rt P o P Φ CO Ω h- 1 OJ Φ 1 μ- μ- 0J *<; CO 0J hj < Hi * OJ rt φ Ω ϋ H TJ φ P P rt CO μ- CO CQ TJ Φ φ TJ μ- Ω ϋ r hi CQ CQ 0 φ 3 0J 3 O 0i O d i Ξ rt OJ OJ Φ O rt • - 1 ii P P. μ- Φ hj 0J P rt φ P ii μ- hi μ- P P tr •<: Φ φ μ 1 Ωi Φ rt μ- Φ Ω φ TJ OJ rt μ- 3 LQ CO μ- ti CQ rt tπ < μ- P h- 1 ft 0 rt tr Ω CQ φ μ- O TJ μ- 0 tr - 0J Φ 0J μ- O Φ hj 0 CO OJ 3 O μ- d li co Hi hi ft P H OJ μ- Hi φ rt h- 1 μ> φ P P LQ o r o 3 h-> LQ D Ω φ r P LQ tr <! 0i rt d h- 1 Φ • < rt rr OJ rr o OJ Φ " rt μ- P tr LQ Φ OJ tr tr hi CO 0J Pi rt φ tr 0J P φ Φ rt P φ CQ O P. 0J rt

Inventors: BEELE JOHANNES ALFRED, BEELE, JOHANNES, ALFRED
Applicants: BEELE ENG BV, BEELE JOHANNES ALFRED, BEELE ENGINEERING B.V., BEELE, JOHANNES, ALFRED
Application year: 2001
Main classification: H02G3
IPC codes: H02G3, H05K9