WO1997029531A1 - Continuite electrique de cablage et son procede d'installation - Google Patents

Continuite electrique de cablage et son procede d'installation Download PDF

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Publication number
WO1997029531A1
WO1997029531A1 PCT/FI1997/000048 FI9700048W WO9729531A1 WO 1997029531 A1 WO1997029531 A1 WO 1997029531A1 FI 9700048 W FI9700048 W FI 9700048W WO 9729531 A1 WO9729531 A1 WO 9729531A1
Authority
WO
WIPO (PCT)
Prior art keywords
cable
sleeve
bonding assembly
bonding
conductive
Prior art date
Application number
PCT/FI1997/000048
Other languages
English (en)
Inventor
Markku Hakola
Original Assignee
Abb Industry Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Abb Industry Oy filed Critical Abb Industry Oy
Priority to AU15484/97A priority Critical patent/AU1548497A/en
Publication of WO1997029531A1 publication Critical patent/WO1997029531A1/fr

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0007—Casings
    • H05K9/0018—Casings with provisions to reduce aperture leakages in walls, e.g. terminals, connectors, cables
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
    • H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings

Definitions

  • the invention relates to an EMI/RFI suppressing cable bonding assembly according to the preamble of claim 1 particularly for power electronics cabling.
  • the invention also concerns a method of fitting a cable bonding assembly to the bottoms and tops of control cabinets and other similar wall structures through which cables have to be passed.
  • a simple bonding fitting installable by a straight-forward bonding procedure is desirable.
  • a bushing containing a circularly coiled spring of conductive material is mounted to the wall structure to be passed by a cable.
  • Such a bonding bushing is precision-dimensioned so that the cable unsheathed by a length of its insulating jacket can be inserted through the hole of the bonding bushing, whereby the spring forms a conductive bond with the exposed conductive cable shield.
  • this bonding bushing embodiment The greatest disadvantage of this bonding bushing embodiment is that the bushing and the spring must be dimensioned very accurately according to the diameter of the cable used. In practice, this may not generally be possible, because the diameter of the cable employed by the end-user is not known in beforehand or for some other reason it is difficult to obtain in ⁇ formation on the cable diameter sufficiently in advance for equipping the cabinets to be delivered with bonding bushings of exactly correct size.
  • This type of bushing is also subject to installation damages, because the ground ⁇ ing spring is easily bent into an incorrect position, whereby the desired low-resistance performance of the bonding assembly is compromised.
  • Another method of making the cable bonding is to use a bushing intented originally for a fire-proof bonding in which the fire-insulating material is at least partially conductive. Usually the partially or seminconducting materials do not have good enough conductivity especially on high frequenzies, wherefore their use is not recommended in actual interference suppression.
  • a bonding box containing the fire-insulating material is fitted to the wall structure to be equipped with the cable bonding assembly.
  • the insulating material is fabricated into a layered packing from which a desired number of layers can be peeled off so as to prepare bonding holes of different diameters.
  • Fully circumferentially bonding connector structures are known from, e.g., low voltage electric equipment in which the electrostatic shield of the cable is bonded by its entire perimeter to the connector body and thus via the connector to the ground potential. While this method provides excellent EMI/RFI suppression performance, it is usually unsuitable for power electronics applications simply because the free space required by the cable bonding connector is not available on both sides of the wall structure. Since the bonding connectors must be installed orthogonally to the wall surface, in many cases it will be impossible to route cables properly to the bonding connectors. Moreover, the use of separate connec ⁇ tors for cable bonding causes unnecessary costs and forms three electrical interfaces, namely, those of the cable ends to the connector parts on both sides and the inter- face between the two mating connector parts.
  • Patent specification US 4,855,533 describes an EMI sup- pressing bonding bushing in which the cable is passed through a flange made from sheet metal or foil.
  • the hole of the flange is provided with comb-like slit fingers which are bent over the unsheathed conductive shield of the cable.
  • This embodiment involves the use of special tube-like bonding parts which require a substantial free space reservation both laterally and vertically. Since the cable is supported stiffly to the bonding assembly, it cannot be moved axially or radially and it must be passed absolutely orthogonally through the bonding assembly.
  • the flange structure is suitable for use with circular-section cables only.
  • the flange is made from two parts, whereby a gap unavoidably remains between the installed parts. Similarly, also a gap remains between the slit fingers. While this method can offer good interference suppression at lower frequencies, the gaps may at higher frequencies form a slot antenna capable of radiating EMI/RFI to the surroundings. Thence, this arrangement is not suited for high-performance EMI/RFI suppression at higher frequencies. In practice, the EMI/RFI suppression performance of the flange is sub ⁇ stantially dependent on how small the interpart gaps can be made.
  • the goal of the invention is achieved by fitting about the conductive shield of the cable a conductive sleeve made into a braided sheath of flexible wires that encircles the cable by its one end edge and is bonded to a conductive wall structure at its other end edge.
  • the bonding assembly according to the invention is characterized by what is stated in the char ⁇ acterizing part of claim 1.
  • the invention offers significant benefits.
  • the most important benefit of the present invention is therein that it is capable of providing an extremely simple way of making a cable bonding with the required 360° circumferential cable shield bonding. As no gaps will remain in the braided sleeve nor in the bonding assembly as a whole, the EMI/RFI suppression efficiency of the bond stays good even at the higher frequencies.
  • the present type of conductive sleeve bonded to the cable shield can be connected to a potential dif ⁇ ferent from the ground potential.
  • the point of cable feed-through exhibits a great elasticity which permits cable routing even from the most oblique directions.
  • the same basic construction can be used for cables of widely varying diameters, and the same feed-through hole can accommodate cables of different diameters, which relieves cabinet manufacturers from knowing exactly the cable sizes the customer is going to use.
  • Mounting of the cable bonding assembly is very uncomplicated and can be done without using special tools. Owing to the elastic nature of the feed-through assembly also in the longitudinal direction of the cable, the length of the cable to be exposed by unsheathing need not be dimensioned very accu ⁇ rately.
  • the bonding assembly permits lateral movement of the cable without undergoing a damage, and the assembly can be provided with water/dust protection and fire- retardant insulation.
  • the invention makes it possible to achieve a low-impedance cable bond, which is a most desirable property of the bonding assembly.
  • the flexible braided bonding sleeve can be fitted over the conductive shields of any type of cable such as flexible sheaths and corrugated armour pipes.
  • the cable cross section need not necessarily be circular, wherefore the invention may also be employed in conjunction with cables of various, for example triangular cross section.
  • the present invention may also be employed for EMI/RFI suppression in existing equipment, whereby cable bondings can be upgraded when, e.g., changes are made to the system cabling.
  • Figure 1 shows a first embodiment of the invention
  • Figure 2 shows a second embodiment of the invention
  • Figure 3 shows a third embodiment of the invention.
  • Figure 4 shows a fourth embodiment of the invention
  • FIGs. 1 - 3 therein is shown the entry of cables into a control cabinet, whereby the cables 1 are passed into the cabinet via its bottom.
  • the interior of the cabinet is up and the exterior of the cabinet is down.
  • all the diagrams illustrate an embodiment of the bushing assembly in which the cable entry is arranged to a separate bushing flange 4, the assembly is as well suited for use directly on a wall structure to be passed.
  • the flange 4 has a hole with a raised collar 6 formed to its edge. To the hole is attached by welding a bonding collar 5 of a sufficiently wide inner diameter to loosely accommodate the thickest cable 1 to be installed.
  • Such an oversizing of the bonding collar 5 is necessary, because the diameter of the cable(s) to be installed is not generally known during the manufacture of the cabinet.
  • the cable 1 is passed via the bonding collar 5, and the outermost jacket of the cable, namely, its insulating sheath 2 is removed from a short length about the bonding collar in order to expose the conductive shield 3 of the cable for an elec- trical contact.
  • a cable tie 9 onto the conductive shield 3 is fixed one end edge of a flexible sleeve 8 made of conductive material, and the other end edge of the sleeve is fixed by another cable tie 7 to the bonding collar 5.
  • the sleeve circumferentially encircles both the cable 1 and the bonding collar 5, thus forming a contiguous, low-impedance bonding for the conductive shield 3 of the cable. Thence, the bonding assembly can be fitted without using any strap-like conductive part(s).
  • the outer jacket 2 of the cable 1 is continued intact into the interior of the cabinet, which means that the cable 1 is protected by its insulation up to the bonding point.
  • An alternative fixing method of the flexible sleeve 8 is shown in Fig. 3.
  • the flexi ⁇ ble sleeve 8 is fixed to the raised collar 6 of the bushing flange 4, whereby the bonding collar is not necessarily required at all.
  • the bonding collar 5 is useful by supporting the cable 1 at its entry point thereby protecting the cable 1.
  • a bonding assembly particularly suited for cable entry via the top of con ⁇ trol cabinets.
  • the bushing flange 4 is mounted to the top 10 of the cabinet and the raised collar 6 of the flange 4 is aligned upward so as to remain outside the cabinet.
  • the conductive sleeve is fixed in the same fashion as in the other embodiments described above.
  • the bushing is protected by a rubber seal 11 through which the cable is passed.
  • One edge of the rubber seal 11 has a beaded locking rim 12 which is compatible with the groove of the raised collar and thus suitable for snap-fitting over the raised collar 6 so as to lock the rubber seal in place and make the bonding assembly water- and dust-proof.
  • the hole of the bushing assembly at the bonding collar 5 can be packed with a fire-insulating material such as mineral or ceramic wool, which is capable of retarding fire from reaching through the bonding assembly.
  • a fire-insulating material such as mineral or ceramic wool
  • a bonding assembly of the above-described type is manu ⁇ factured by providing the cabinet or similar object to be equipped with the bonding assembly with a hole for cable entry either by directly punching a hole of correct size in the cabinet wall at the factory, or alternatively, by mounting a separate bushing flange 4 onto a larger open ⁇ ing.
  • the bushing flange may also be fitted at the in ⁇ stallation site, and the fitting technique can be select ⁇ ed from a group of conventional mounting techniques.
  • a sleeve 8 of conductive material is fixed by a cable tie 7 to the bonding collar 5 of the bushing flange.
  • the length to be unsheathed from the cable l is measured at a suitable distance from the tail end of the cable, the outer insulating sheath 2 of the cable 1 is removed, the cable 1 is inserted through the bushing flange, and conductive sleeve 8 is compressed about the unsheathed area of the cable 1 by means of another cable tie 9.
  • the flexible, conductive sleeve can be fabricated from a variety of different materials and it can be ready-made into tubular form, or alternatively, the sleeve can be formed from a sheet-like blank of a net, which is wrapped about the cable. Particularly advantageously, the sleeve is made from conductive metal fabrics or plastic fabrics coated conductive by a metal.
  • the sleeve can be fabri ⁇ cated by braiding, knitting or other suitable method capable of producing a flexible sleeve formed by crossed wires. Obviously, differently shaped cross sections of the wire may be used.
  • the metallic bushing flange can be replaced by a flange made from a polymer-based material which must be made conductive by metallic coating for instance if the flexible sleeve is to be fixed directly thereto.
  • the collar can be attached to the bushing flange by any suit ⁇ able method.
  • the flexible sleeve may be bonded directly to the bushing sleeve, or alternatively, to other conduc ⁇ tive surface about the cable entry, whereby the collar itself may be of a nonconductive material.
  • the bonding of the flexible sleeve to the conductive shield of the cable may be implemented using a variety of circular clamps designed for circumferential locking, or alternatively, the sleeve may be directly soldered to the cable shield. Also screws, rivets or other fixing means may be used for bonding the sleeve to the bonding collar, bonding flange or surface about the point of cable entry provided that a bond of sufficiently low resistance is obtained.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Installation Of Indoor Wiring (AREA)

Abstract

Continuité électrique de câblage neutralisant les interférences électro-magnétiques et de hautes fréquences, notamment pour le câblage d'alimentation d'appareils électroniques et procédé d'installation d'une continuité électrique de raccordement dans les parties inférieures et supérieures d'armoires de commande et autres structures analogues à parois à travers lesquelles passent des câbles. L'invention repose sur le montage d'un manchon conducteur (8), réalisé dans un matériau souple, par un bord d'extrémité du manchon en serrant étroitement le blindage conducteur (3) du câble (1) de manière à enserrer entièrement ledit câble, et la fixation du bord d'extrémité opposé du manchon, au niveau du point d'entrée du câble, à une surface conductrice (5).
PCT/FI1997/000048 1996-02-07 1997-01-30 Continuite electrique de cablage et son procede d'installation WO1997029531A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU15484/97A AU1548497A (en) 1996-02-07 1997-01-30 Cable bonding assembly and method of fitting the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI960561 1996-02-07
FI960561A FI960561A (fi) 1996-02-07 1996-02-07 Kaapeliläpivienti ja menetelmä sen tekemiseksi

Publications (1)

Publication Number Publication Date
WO1997029531A1 true WO1997029531A1 (fr) 1997-08-14

Family

ID=8545343

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1997/000048 WO1997029531A1 (fr) 1996-02-07 1997-01-30 Continuite electrique de cablage et son procede d'installation

Country Status (3)

Country Link
AU (1) AU1548497A (fr)
FI (1) FI960561A (fr)
WO (1) WO1997029531A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19825672A1 (de) * 1998-06-09 1999-12-23 Vogt Gmbh & Co Kg A Kabeldurchführungsvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4362898A (en) * 1980-12-09 1982-12-07 The United States Of America As Represented By The Secretary Of The Navy Flush mounted low impedance grounding cone
US4625072A (en) * 1985-01-14 1986-11-25 G&H Technology, Inc. Cable shield termination means
US4677253A (en) * 1984-03-23 1987-06-30 Ab Lyckeaborg Bruk Radiation protective device for the lead-through of cables
US4855533A (en) * 1987-05-29 1989-08-08 Pidou B.V. Bushing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4362898A (en) * 1980-12-09 1982-12-07 The United States Of America As Represented By The Secretary Of The Navy Flush mounted low impedance grounding cone
US4677253A (en) * 1984-03-23 1987-06-30 Ab Lyckeaborg Bruk Radiation protective device for the lead-through of cables
US4625072A (en) * 1985-01-14 1986-11-25 G&H Technology, Inc. Cable shield termination means
US4855533A (en) * 1987-05-29 1989-08-08 Pidou B.V. Bushing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19825672A1 (de) * 1998-06-09 1999-12-23 Vogt Gmbh & Co Kg A Kabeldurchführungsvorrichtung

Also Published As

Publication number Publication date
FI960561A0 (fi) 1996-02-07
AU1548497A (en) 1997-08-28
FI960561A (fi) 1997-08-08

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