RayfitThe advanced Raychem heat-shrinkable joint sleeve for medium voltage joints up to 36 kV

Energy Division

RayfitThe advanced Raychem heat-shrinkable joint sleeve for medium voltage joints up to 36 kV

Energy Division

The advanced Raychem heat-shrinkable joint sleevefor medium voltage joints up to 36 kV

Rayfit

Modern jointing Today’s jointing technology is requiredto be simpler and more economicalyet provides higher levels of reliabilityand flexibility for operators who areunder increasing pressure to improvenetwork efficiency. Rayfit achievesthese objectives and has additionalvaluable features including:

• high recovery forces• reduced installation time• slim and space-saving design

Kits are easy to select, will accommo-date a variety of cable and conductortypes and can include all componentsnecessary to complete the joint.Important among the range of features is the option to include purpose-designed range-takingmechanical shear bolt connectors for conductor and shield wires.

Rayfit joint sleeve The triple layer heat-shrinkable jointsleeve combines:

1 heat-shrinkable outer conductive layer

2 heat-shrinkable insulation layer 3 elastomeric insulation layer

Recovered

A triple-extruded hybrid component combining heat-shrink and elastomeric technology

ERIT ERIC ERIH

12 kV 24 kV 36 kV

1 2 3

Expanded

Rayfit represents the new generationof heat-shrinkable jointing technology.It is based on a triple-extruded heat-shrinkable elasto meric joint sleevecom ponent. The system is suitablefor paper and polymeric cable constructions and is designed toaccommodate modern jointingrequirements such as mechanicalshear bolt connectors.

Main features

• Triple-extruded body provides a pre-engineered joint unit with fewer kit components

• Advanced shrink behaviour and profile-following are combined with a significant reduction in shrink time

• High recovery forces result in tight electrical interfaces and perfect sealing ability

• Optimised heat transfer due toreduced thermal capacity

• The reduced overall joint diameterprovides a slimmer and space- saving profile

• As an alternative to crimp connec-tors, kits can be selected withmechanical shear bolt connectorsfor con ductor and shield continuity

• Unlimited shelf-life simplifies material logistics and reduces cost

• Exceeds international performance standards including CENELEC HD 629 and IEC 60502 for joints and IEC 61238 for Tyco BSM typemechanical connectors

New triple layer elastomeric ERICinterface stress control to joint sleeveinterface stress control to cabledielectric

Existing dual layer elastomeric ECICinterface stress control to joint sleeveinterface stress control to cabledielectric

Rayfit joint sleeveThe outer conductive layer and insulating middle layer provide theheat-shrinkable hold-out for the innerelastomeric layer of the joint sleeve.During the heat-shrink installationprocess, the stored recovery force of the elastomer is released and combines with the recovery force ofthe heat- shrinkable layers. As a result, the electrical interfacesare reduced to the minimum and thejoint sleeve provides a tight electricalinterface. The elastomeric characteristic of thematerials, combined with the rigidouter heat-shrinkable (screen) layersenable the joint to follow the thermallyinduced dimensional changes of thecable insulation.

New triple layer elastomeric ERIT

Dual layer elastomeric ECIT

Co-extruded heat-shrinkablesleeve CICM (non elastomeric)

Joint sleeve recovery forces during installation

Joint sleeve temperature distribution during installation

120

110

100

90

80

70

60

50

40

30

20

cooling downheating

ERIC

ECIC

t [min.]Shrink time

T [

°C]

t [min.]

F [

N]

Cordless impact wrench for simpleand easy installation of mechanicalconnectors.

Shield continuity With mechanical shear-bolt connectorsas standard, typical shield wire crosssections up to 35mm2 can easily beconnected with the connector supplied in the kit. Positioned at theoversheath cut back, the connectionprovides a smooth profile and resistsmechanical damage. There is no needfor a crimping tool and its mainte-nance. Shear bolts provide the requiredcontact force in order to ensure safeinstallation and reliable performanceduring load cycling in service as well asduring short circuit conditions. Anadditional layer of copper mesh isapplied around the joint to provideeffective shielding and protection.

Other jointing elements

Joint kits for other connector tech -nologies including deep indent andhexagonal compression are available.

Electrical stress controlThe stress control sleeves in combina-tion with stress grading mastic at thescreen cut provide a precisely definedimpedance characteristic whichsmoothes the electrical field. For easeof installation, mechanical shear-boltconnectors are applied in combinationwith a stress control patch while jointswith compression connectors usemastic tape for void filling and stressgrading.

ArmouringAs some cable designs use a steelwire armour to provide a certainmechanical strength, joint designershave to provide the same perfor-mance. A steel wire armour wrap incombination with a heat-shrinkablesleeve or fibre reinforced wraparoundare being used to fulfill the impacttest requirements as requested e.g. in the CENELEC specification.

Robust outer sealing and protectionModern cable laying techniques requirea robust oversheath replacementcapable of withstanding high mechan-ical stresses during conventional cablelaying as well as mechanical impactoccurring during the entire cable life.The thick-wall heat-shrinkable tubingis internally coated with a hot-meltadhesive to ensure an effective moisture seal and corrosion protectionfor the joint. When installed, the jointsprovide a level of protection andthickness equal to modern cables with PE oversheath. A space savingalternative using a fibre re-enforcedwraparound sleeve coated with hotmelt adhesive can be selected forinstallations in manholes and restrictedjoint bays.

Mechanical shear-bolt connectors Joint kits can be selected to include aTyco BSM type mechanical shear-boltconnector to ensure a reliable pre-engineered electrical connection for different conductor types andmate rials.

•range-taking sizes cover 25-400 mm2

conductor cross-sections for alu -minium and copper conductors

•pre-set shear torque provides safe and reliable installation

•removable half shell insert providecore centering

•tin-plated and greased contact surface for corrosion protection

•no need for compression tools ormaintenance

•shorter length compared to com -pression connectors

•tested in accordance with IEC 61238•excellent tensile performance due to special bolt tip design

EPKE Single core live end seals (stop end) up to 36 kV

SXSU Medium voltage joints up to 36 kV using compression connectors

MXSU Medium voltage joints up to 36 kV including mechanical connectors

Product families for polymeric insulated cables

EPKB Medium voltage branch joints up to 24 kV including mechanical connectors

REPJ Medium voltage repair joints up to 24 kV including mechanical connectors

Universal jointing system to connect all common cabletypes using compression connectors

EPKJ-R

3-core screened or belted cables

3-core single lead cables

System technologyFew heat-shrinkable components like oil barrier sleeves, conductive breakoutsetc. transfer paper cables into quasi polymeric type allowing the use of the samejointing sleeves.

Transition joints up to 24 kV including Tyco BSM typemechanical shear bolt connectors

MXSU

3-core screened or belted cables

3-core single lead cables

3-core polymeric cables

1-core lead sheathed cables

1-core polymeric cables

Committed to Quality

ISO 9000 series and ISO 14001 certifications for almost all locationsunderline our con tinuing commitmentto quality and the environ ment. All Energy Division products are subjected to extensive testing fromthe time they enter our plants as rawmaterial until they leave as finishedproducts. Requalification testing iscarried out on a regular basis withinstalled components. Customers can thus have full confidence in theproducts, services and data supplied. In many cases, this saves the cost and inconvenience of any furtherdownstream verification. All our electrical power products meetinternational specifications, such asIEC, CENELEC, IEEE, and virtually allnational standards.

All of the above information, including drawings, illustrations and graphic designs, reflects our present understanding and is to the best of our knowledge and belief correct andreliable. Users, however, should independently evaluate the suitability of each product for the desired application. Under no circumstances does this constitute an assurance of anyparticular quality or performance. Such an assurance is only provided in the context of our product specifications or explicit contractual arrangements. Our liability for these products is set forth in our standard terms and conditions of sale. Raychem, TE Logo and Tyco Electronics are trademarks.

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Tyco Electronics Raychem GmbH Energy DivisionFinsinger Feld 185521 Ottobrunn/Munich, Germany

Phone: +49-89-6089-0 Fax: +49-89-6096345

http://energy.tycoelectronics.com

Energy Division – innovative and economical solutions for the electrical power industry: cable accessories, connectors & fittings, insulators & insulation, surge arresters, switching equipment, lighting controls, Power Measurement and Control.