GB2507746A - Medium voltage electrical connection - Google Patents

Medium voltage electrical connection Download PDF

Info

Publication number
GB2507746A
GB2507746A GB1220071.3A GB201220071A GB2507746A GB 2507746 A GB2507746 A GB 2507746A GB 201220071 A GB201220071 A GB 201220071A GB 2507746 A GB2507746 A GB 2507746A
Authority
GB
United Kingdom
Prior art keywords
isolating
layer
conductor
medium voltage
conducting
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB1220071.3A
Other versions
GB201220071D0 (en
Inventor
Paulus Geusendam
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Danfoss Power Solutions II BV
Original Assignee
Eaton Industries Netherlands BV
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 Eaton Industries Netherlands BV filed Critical Eaton Industries Netherlands BV
Priority to GB1220071.3A priority Critical patent/GB2507746A/en
Publication of GB201220071D0 publication Critical patent/GB201220071D0/en
Priority to PCT/EP2013/072517 priority patent/WO2014067902A1/en
Priority to BR112015009862A priority patent/BR112015009862A2/en
Priority to CA2889932A priority patent/CA2889932A1/en
Priority to PL13789506T priority patent/PL2915220T3/en
Priority to US14/438,935 priority patent/US9859664B2/en
Priority to RU2015120336A priority patent/RU2015120336A/en
Priority to EP13789506.6A priority patent/EP2915220B1/en
Publication of GB2507746A publication Critical patent/GB2507746A/en
Priority to IN4021DEN2015 priority patent/IN2015DN04021A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/70—Insulation of connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0503—Connection between two cable ends
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0527—Connection to outer conductor by action of a resilient member, e.g. spring
    • 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
    • H02G15/00—Cable fittings
    • H02G15/02—Cable terminations
    • H02G15/025—Cable terminations for coaxial cables or hollow conductors
    • 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
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/085—Cable junctions for coaxial cables or hollow conductors
    • 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
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
    • H02G15/103—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes with devices for relieving electrical stress
    • H02G15/105—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes with devices for relieving electrical stress connected to the cable shield only
    • 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
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
    • H02G15/184—Cable junctions protected by sleeves, e.g. for communication cable with devices for relieving electrical stress
    • H02G15/188—Cable junctions protected by sleeves, e.g. for communication cable with devices for relieving electrical stress connected to a cable shield only

Landscapes

  • Transformers For Measuring Instruments (AREA)
  • Cable Accessories (AREA)

Abstract

A medium voltage connection comprises a first conductor 21 and a second conductor 22 electrically attached to each other. A first isolating layer 25 is arranged around the first conductor and a second isolating layer 26 arranged around the second conductor, leaving an airgap between them. An isolating rubber sleeve 29 is arranged between the first isolating layer and the second isolating layer to fill the airgap between the two isolating layers. The rubber sleeve is provided with a conducting portion 30, which overlaps with a conducting layer 28 arranged on the first isolating layer to provide a ground screen which is not embedded in the layer. The second isolating layer may overlie the isolating portion of the rubber sleeve, so that the area where the electric field is strongest is well enveloped. The conducting layer may be paint, and the conducting portion may be carbon black.

Description

Medium voltage connection The invention relates to a medium voltage connection, comprising: -a first conductor and a second conductor electrically attached to each other; -a first iso'ating laycr arrangcd around the first conductor and a second isolating layer arranged around thc second conductor, leaving an airgap bctwccn both isolating layers; -an isolating rubber sleeve arranged between the first isolating layer and the second isolating layer to fill thc airgap between the two isolating layers.
Such medium voltage connections are known and are used in switchgear to connect for example inbound or outbound cables to the switchgear. These medium voltage connections are also used to connect the busbars of adjacent panels of switchgear.
In some applications of the medium voltage connections at least the first conductor is provided with a ground screen. Such a screen is for example used at busbar connections or with current transformers, which are typically used to provide a low voltage signal for measuring the current in the first conductor. In this last application, it is necessary to have a grounding screen between the first conductor and the coil arranged around the conductor to prevent flash over to the low voltage side.
It is known to embed a grounding screen in the isolating layer around the conductor.
In manufacturing, a perforated tube is positioned concentrically around the conductor, where after a resin is cast around the conductor and the screen. The perforations ensure that the resin can penetrate the screen.
It proves however that this manufacturing method results in a high number of rejected products. This is the result of misaligned screens, deformed screens and air pockets in the resin.
Another disadvantage of the known screens, is that a high field density is present around the edge of the screens. Because the screen is embedded in isolating material, the field density will extend into the air surrounding the medium voltage connection, which is undesired, especially with low voltages components near the medium voltage connection. This could lead to undesired electrical discharges.
Yet another disadvantage of the known medium voltage connection, is that when connecting for example a cable to the first conductor with embedded screen in the isolating layer, the medium voltage connection is subjected to substantial mechanical stresses. These mechanical stresses are caused by the weight of the cable and by the expanding and shrinking of the isolating material due to heating and cooling of the connection. In time, this results in cracks in the isolating layer.
It is an object of the invention to reduce or even remove the above mentioned disadvantages.
This object is achieved with a medium voltage connection according to the invention, which is characterized in that a conducting layer is arranged on the first isolating layer; and in that the rubber sleeve is provided with a conducting portion, which overlaps with the conducting layer.
By providing a conducting layer on the isolating layer, it is ensured that the grounding screen provided by the conducting layer is always correctly positioned. It is no longer necessary to afready position the screen before casting the isolating layer, but with the invention the isolating layer can be cast first and afterwards, the conducting layer can bc arranged. This substantially reduces the number of rejects during manufacturing, as positioning of the screen will always be correct.
The conducting portion of the rubber sleeve ensures that the end of the screen is extended into the airgap between the two isolating layers. The high field concentration typically present at the edge of the screen is in this way moved to a position well enveloped by isolating material.
An additional advantage of arranging the conducting layer on the isolating layer of the conductor, is that with the same outer dimensions a thicker layer of insulating material is present between the screen and the conductor. This substantially increases the dielectric robustness.
As the screen is arranged on the outside and no longer embedded in the isolation layer, as with the prior art, the mechanical stresses have less influence, resulting in a better durability.
In a preferred embodiment of the medium voltage connection according to the invention, the transition between the conducting portion and isolating portion of the rubber sleeve is positioned between the first and second isolating layers.
The rubber sleeve can be composed out of two separate materials, one isolating portion and one conducting portion. The conducting portion is brought in electrical contact with the conducting layer. In this way, the electrical screen is extended and the edge of the screen is displaced to in between the isolating layers. Any high electrical field concentrations will be kept with the isolating material.
In another embodiment of the medium vohage connection according to the invention the second isolating layer partially envelopes the rubber sleeve and the first isolating layer. This further increases the thickness of isolating material over the extended edge ofthe screen.
Preferably the conducting portion of the rubber sleeve is carbon black filled. Carbon black provides electric conducting properties and can be reliably processed in the manufacturing of the rubber sleeve.
In yet another preferred embodiment of the medium voltage connection according to the invention, a secondary coil is arranged around the first conductor for measuring the current in the first conductor.
The invention is typically, but not exclusively, suited for use in current transformers, in which it is mandatory that thc sccondaiy coil is shicldcd by a grounding scrccn from the medium voltage conductor.
Preferably, the conducting layer is a conducting paint layer. Such a conducting paint layer is easily applied on thc surfacc of thc isolating layer surrounding thc conductor.
These and other features of the invention, will be elucidated in conjunction with the accompanying drawings.
Figure 1 shows a cross sectional view of an embodiment of a medium voltage
connection according to the prior art.
Figure 2 shows a cross sectional view of an embodiment of a medium voltage conncction according to thc invcntion.
Figure 1 shows an embodiment 1 of a medium voltage connection according to the prior art. This conncction I has a first conductor 2 and a sccond conductor 3, which can be bolted together by the threaded holes 4, 5.
The first conductor 3 is provided with a first isolating layer 6. Within the isolating laycr 6, a mctal scrccn 7 is cmbcddcd. Thc cdgc 8 of thc mctal scrccn 7 is bcnt back to
reduce the electrical field concentration.
The second conductor 3 is also provided with an insulating layer 9, which has extending edges 10 enveloping the end of the conductor 2.
A rubber sleeve I I is arranged in between the first isolating layer 6 and the isolating layer 9, 10 to fill the gap.
Because the edge 8 of the screen? is at a distance from the rubber sleeve 11 and the extending edges 10, the electrical field surrounding this edge 8 easily extends into the air around the medium voltage connection 1.
Figure 2 shows a cross sectional view of an embodiment 20 of the invention. The medium voltage connection 20 has a first conductor 21 and a sccond conductor 22, which can be bolted together via the threaded holes 23, 24.
S The first conductor 21 is provided with an isolating layer 25, while the second conductor 22 is also provided with an isolating layer 26 having extending edges 27 to envelope the end of the first conductor 21.
The outer surface of the first isolating layer 25 is provided with a conducting coating 28 of for example conducting paint. This conduction coating 28 provides a grounding screen.
A rubber sleeve 29, 30 is arranged between the first isolating layer 25 and the second isolating layer 26. This rubber sleeve 29, 30 has a isolating portion 29 and a conducting portion 30.
This conducting portion 30 is in contact with the conducting coating 28, such that the edge 31 of the screen 28 is formed by the interface between the conducting portion 30 and the isolating portion 29.
As a result, the edge 31 of the screen is embedded between isolating edge 27 and the isolating layer 25.

Claims (6)

  1. Claims 1. Medium voltage connection, comprising: -a first conductor and a second conductor electrically attached to each other; -a first isolating layer arranged around the first conductor and a second isolating layer arranged around the second conductor, leaving an airgap between both isolating layers; -an isolating rubber sleeve arranged between the first isolating layer and the second isolating layer to fill the airgap between the two isolating layers; characterized in that -a conducting layer is arranged on the first isolating layer; and in that -the rubber sleeve is provided with a conducting portion, which overlaps with the conducting layer.
  2. 2. Medium voltage connection, wherein the transition between the conducting portion and isolating portion of the rubber sleeve is positioned between the first and second isolating layers.
  3. 3. Medium voltage connection according to claim I or 2, wherein the second isolating layer partially envelopes the rubber sleeve and the first isolating layer.
  4. 4. Medium voltage connection according to any of the preceding claims, wherein the conducting portion of the rubber sleeve is carbon black filled.
  5. 5. Medium voltage connection according to any of the preceding claims, wherein a sccondary coil is arrangcd around thc first conductor for measuring the current in the first conductor.
  6. 6. Medium voltage connection according to any of the preceding claims, wherein the conducting layer is a conducting paint layer.
GB1220071.3A 2012-10-30 2012-11-07 Medium voltage electrical connection Withdrawn GB2507746A (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
GB1220071.3A GB2507746A (en) 2012-11-07 2012-11-07 Medium voltage electrical connection
EP13789506.6A EP2915220B1 (en) 2012-10-30 2013-10-28 Medium voltage connection
PL13789506T PL2915220T3 (en) 2012-10-30 2013-10-28 Medium voltage connection
BR112015009862A BR112015009862A2 (en) 2012-10-30 2013-10-28 medium voltage connection
CA2889932A CA2889932A1 (en) 2012-10-30 2013-10-28 Medium voltage connection
PCT/EP2013/072517 WO2014067902A1 (en) 2012-10-30 2013-10-28 Medium voltage connection
US14/438,935 US9859664B2 (en) 2012-10-30 2013-10-28 Medium voltage connection
RU2015120336A RU2015120336A (en) 2012-10-30 2013-10-28 MEDIUM VOLTAGE CONNECTION
IN4021DEN2015 IN2015DN04021A (en) 2012-10-30 2015-05-12

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1220071.3A GB2507746A (en) 2012-11-07 2012-11-07 Medium voltage electrical connection

Publications (2)

Publication Number Publication Date
GB201220071D0 GB201220071D0 (en) 2012-12-19
GB2507746A true GB2507746A (en) 2014-05-14

Family

ID=47429332

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1220071.3A Withdrawn GB2507746A (en) 2012-10-30 2012-11-07 Medium voltage electrical connection

Country Status (1)

Country Link
GB (1) GB2507746A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2042818A (en) * 1979-11-30 1980-09-24 Raychem Gmbh Enclosed for electrical apparatus
FR2551927A1 (en) * 1983-09-08 1985-03-15 Dubois Cie Ets Jacques Electromagnetic-screening device for a joint

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2042818A (en) * 1979-11-30 1980-09-24 Raychem Gmbh Enclosed for electrical apparatus
FR2551927A1 (en) * 1983-09-08 1985-03-15 Dubois Cie Ets Jacques Electromagnetic-screening device for a joint

Also Published As

Publication number Publication date
GB201220071D0 (en) 2012-12-19

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)