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Cable Abandonment For MV HV Cables Including 11kV 33kV High Voltages

11kV 33kV | Medium & High Voltage Cables

• uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager

Cable abandonment kits can be supplied for medium/high voltage cables if the cables are left in the ground but aren’t energised. From the outside, they look similar to live pot end kits, but internally, the phase or phases are connected to earth so that if a voltage is applied to the cables by mistake, an immediate earth fault occurs which trips the circuit breaker.

Please Note: The following Jointing Instructions should be used by a trained competent cable jointer only – contact us to discuss the availability of Cable Jointer Training Courses.

A Jointers gas torch is preferred method for heat shrinking these materials making sure all tubes and materials are kept clean, dry and are free from dust, sand or grease.

In the following post we reproduce the Cable Abandonment Kit installation instruction – should you have any questions or queries please do not hesitate to contact us.

See also:

• Pot End Live Cable End Seal | 11kV Cables Single Core XLPE CWS
• Pot End Live Cable End Seal | 11kV Cables 3 Core XLPE EPR

MV HV Cable Abandonment

XLPE EPR Insulated Power Cables 11kV 33kV

Abandonment kits can be kitted from stock using heat shrink tubes to suit 11kV/33kV medium and high voltage cables with polyermic (XLPE EPR) or paper insulation (PILC) – single or 3 core cables accommodated with wire armour (SWA AWA), wire braid (PBSB GSWB) and lead cover sheaths.

1. Remove the outer cable jacket using appropriate sheath stripping tools and expose approximately 100mm of the inner cable bedding with the cable cores beneath.

2. If cable is armoured (SWA) or has a braid screen, expose the cable armour wires or screen to the length of the armour support ring. Fit the support ring as shown in Fig 2.

3. As shown in Fig 2, position the copper earth braid upon each conductor and hammer a nail through the braid so that it is held securely in place. Do this on each core with the same copper earth braid.

Note: if solid aluminium conductor, remove some insulation on each core and use the copper mesh supplied to wrap around the MV HV cable conductors before taking this back to the armour wires.

4. Wrap copper mesh all around the cable and secure along with the earth braid to the armour wires/braid screen with the worm drive clamp or constant force roll spring supplied as shown above in Fig 3. Apply black mastic tape over any sharp points.

Note: if non armoured cable and if specified, the cable abandonment kit can be supplied with a copper strap to bond to earth externally. Position the solder block on a turn of mastic tape and apply a further turn of tape as shown above in Fig 3.

5.Position the heatshrink end cap over the cable and using a suitable heat source, heat shrink the cap into position.

If the cap does not cover the exposed earthing, position the additional heat shrink tube and shrink so that it overlaps onto the outer cable sheath and onto the cable end cap.

Note: clean and abrade the outer cable jacket before fitting.

6. Additional green heatshrink sleeve can be supplied to fit onto the outside of the cable abandonment kit to comply with DNO specifications. Trim before fitting if necessary.

Low Voltage Cable Abandonment Using 3M Cold Shrink

For the abandonment of LV power and instrumentation cables located both onshore and offshore we can recommend 3M Cold Shrink cable abandonment kits.

Cable Abandonment Using Cold Shrink

Thorne & Derrick – Stockists & Suppliers of MV HV Joints, Terminations & Connectors

THORNE & DERRICK are national distributors MV & HV Cable Jointing, Substation Earthing & Cable Installations –  we service UK and global businesses involved in cable installations, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV.

LV Cable Accessory Distributors

T&D stock and supply cable accessories to Cable Cleat, Gland, Joint & Terminate armoured/unarmoured multicore (SWA) or single core (AWA) power cables into low and high voltage substations – the LV cable installation accessories support electricity distribution to main distribution switchgear, sub-distribution boards and transformers.

➡ How To Abandon Cables Using 3M Cold Shrink Cable Abandonment Kits CSCAK

CMP Glands | 3M Joints | Cembre Lugs | Ellis Cleats | LV Cable Accessories

Since 1985, T&D have established an international reputation based on SERVICE | INTEGRITY | TRUST.

Separable Connectors For Eaton Xiria MV HV Switchgear RMU (Ring Main Unit)

Separable Connectors To Terminate Cables Into MV Switchgear

• Uploaded By: Chris Dodds Thorne & Derrick Sales & Marketing Manager

The following article confirms the current types and manufacturers brands of Separable Connectors that are approved to terminate medium/high voltage cables (11kV/12kV up to 24kV) into Ring Main Unit switchgear for application with Eaton Xiria 12kV/24kV medium voltage distribution networks.

Separable connectors manufactured by Nexans Euromold are moulded from high quality EPDM rubber, fully insulated and sealed, widely installed onto medium/high voltage pad-mounted switchgear, transformers, sectionalising cabinets and used to terminate MV cables into switchgear up to 24kV.

Separable Connectors

The MV switchgear manufactured by Eaton is provided with epoxy resin cable bushings or cones according to EN 50181 – the following types of separable connectors are manufacturer approved and compatible with their switchgear.

• Cables are Polymeric Insulated XLPE type usually with operating voltages of 11kV/12kV up to 24kV

Interface A Circuit-breaker 200A including current transformers

Interface C Circuit-breaker 500A including current transformers

Interface C Load-break switch 630A without current transformers

MV Cable connectors & Terminations

Cable connectors are not included with the switchgear and should be ordered seperately.

For 24kV connections separable connectors with an earthed layer on the outside must be used, for 12kV connections connectors without an earthed layer might be used also.

Both types of separable connectors may not exceed certain dimensions to avoid incompatibility of the MV connector with the switchgear panel.

The interface bushings or switchgear cones in the Eaton medium voltage system are according to EN 50181. They can be of the Interface A (250A design, panel rating 200A) and Interface C (630A).

For connection of MV-HV cables into air insulated equipment or cable-end boxes we can provide a complete range of heat shrink cable terminations or for working on switchgear located in potentially explosive atmospheres such as offshore oil and gas platforms where it is not possible to use heat shrink type kits a cold shrink termination can be provided.

Full supporting range of MV-HV cable connectors to enable the termination and connection of copper or aluminium conductors onto busbar are available also from stock.

As an example some possible brands are shown here including Nexans Euromold connectors:

Euromold Type K158LR Xiria Circuit Breaker Outer Cone Type Interface A 200A Bushing

Euromold Type K430TB Xiria Circuit Breaker Outer Cone Interface Type C 500A Bushing

Tyco Type RSES Xiria Circuit Breaker Outer Cone Inerface Type A 200A Bushing

Tyco Type RSTI58 Xiria Load Break Switch Outer Cone Interface Type C 630A Bushing

Euromold Type K400TB Xiria Load Break Switch Outer Cone Interface Type C 630A Bushing

Tyco RSTICC58 Xiria Circuit Breaker Outer Cone Interface Type C 500A Bushing with double cable for metering (one primary cable and one cable for a voltage transformer)

Tyco Type RICS Xiria Load Break Switch Outer Cone Interface Type C 630A Bushing

Euromold

The Euromold range of Separable Connectors are suitable for the termination of power cables onto all MV-HV bushing interfaces:

View the complete range of Nexans Terminations | Joints | Connectors

THORNE & DERRICK are national distributors LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment – we service UK and global businesses involved in cable installations, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV.

Since 1985, T&D have established an international reputation based on SERVICE | INTEGRITY | TRUST.

Contact us for 3M Electrical, ABB, Alroc, AN Wallis, CATU Electrical, Cembre, Centriforce, CMP, CSD, Elastimold, Ellis Patents, Emtelle, Euromold, Filoform , Furse, Lucy Electric & Zodion, Nexans, Pfisterer, Polypipe, Prysmian, Roxtec, Sicame, WT Henley.

Invitation

Thorne & Derrick invite you to join LinkedIn’s largest LV-HV Electrical Discussion Group : Low & High Voltage Power, Cabling, Jointing & Electricals. Discussion subjects include cable installations, earthing, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV. Network, engage and promote your profile, company or products with over 10,000 influencers.

VIDEO Cable Termination Using Heat Shrink Terminations – 33kV Single Core Cables

Cable Terminations Training Videos

• Uploaded By: Chris Dodds Thorne & Derrick Sales & Marketing Manager

Terminating Cables

As Specialist Distributors of MV HV Cable Joints & Terminations using heat shrink and cold shrink type technologies, Thorne & Derrick have a commitment to clients to ensure cable accessories are installed safely, correctly and in accordance with the manufacturers instructions to provide reliability of medium / high voltage electrical power supply.

The Training Video is uploaded to provide general oversight and demonstrate the working procedure to terminate 33kV cables with single core XLPE insulation into medium voltage / high voltage indoor electrical equipment such as switchgear, transformer, RMU, motor or electrical enclosure.

Please note this Video is not intended to qualify electricians to install MV HV cable accessories – 33kV cable joints and terminations should only ever be installed by Competent Jointers and online familiarisation videos are not intended as a substitute for industry regulated and recognised Cable Jointer Training Courses.

In the following Video you will see the cable jointer install a 33kV indoor heat shrinkable cable termination onto XLPE insulated cables, a type of polymeric cable  – the cable is unarmoured type with copper wire screens in accordance with BS7870.

If the cable is armoured, the single core cable would be aluminium wire armoured (AWA) not steel (SWA) – armoured 33kV cable construction would include a copper tape screen and require additional screen earth kits.

Installation process for 33kV terminations is similar to 11kV and 17.5kV, however different kit selection is required and we recommend you contact us to discuss your application.

Watching the video you will understand the importance of using correct cable jointing tools and observing the exact cable stripping measurements – the following stages of the cable termination procedure are also covered:

• Wire Screen Treatment – learn how to earth, bond or ground 33kV power cables with copper wire screens
• Semicon Screen Cut – importance of correct measurement, marking out and preparation of the bonded screen cables
• Cable Shaving – stripping the semiconductive screen from the 33kV cable using jointing tools to achieve a reliable screen-end
• Stress Mastics – applying thin layer overlapping onto insulation and semiconductive layer
• Heat Shrink Techniques – achieve even shrinkage surface of stress control tubes and anti-track tubes using gas torch
• Terminate Conductors – fitting shearbolt cable lugs or 33kV crimp lugs to the stranded copper conductor
• Rain Sheds – installing the heat shrink sheds and heating the collars depending on whether cable termination is indoor or outdoor located
• Cleaning Cables – clean all carbon deposits from MV-HV primary cable insulation (XLPE) to prevent potential tracking by using suitable solvent or cable cleaning wipes.

➡ See the complete range of Heat Shrink Cable Terminations for high voltage cable installations – this includes both 11kV/33kV terminations for single and 3 core polymeric insulated cables, located indoors our outdoors.

Cable Terminations | SWA Cable Glands | Bushing Boots | Shearbolt Lugs | Crimp Lugs | MV HV 11kV 33kV

XLPE Terminations | 11kV Single Core | 11kV 3 Core | 33kV Single Core | 33kV 3 Core

Cable Terminations 11kV Polymeric Indoor & Outdoor | ENWL Approved

Cable Terminations 11kV ENWL Approved

• by Chris Dodds T&D - estimated reading time 5 minutes
  

11kV Cable Terminations

The following 11kV Terminations are currently approved by ENWL for use on their medium/high voltage cable network when jointing, connecting and terminating 11kV polymeric cables to indoor electrical equipment in substations or buildings and pole-mounted overhead line applications. All cables and conductors should be thoroughly prepared and cleaned using approved cable cleaning wipes prior to the installation of terminations, joints or connectors.

For private network installations the Nexans FB1 bushing boots are suitable for either straight or angled connections to switchgear or transformers without need for heat-shrinking. The boots are cold applied and type tested to 15kV for use with Cold shrink or heat shrink cable terminations. Also, the bushing boot can be peeled back for routine medium/high voltage equipment maintenance and testing by voltage detectors without need to be cut-off and re-terminated as with heat shrink types.

11kV Cable Termination Accessories

Read Our Blog: The Next Generation Of 11kV Transformers For MV HV Networks

Termination Of Cable Conductors

Cable jointer preferences and installation conditions of cable joints and terminations determine whether compression or shearbolt technology is used to terminate cable conductors. For instance, 11kV and 33kV single and multi-core medium/high voltage power cables with stranded copper conductors (Class 1) according to BS6622 are commonly crimped or terminated using hydraulic crimping tools (Cembre HT131-C) or battery operated crimping tools (Cembre B1350-CE) – these Cembre tools accommodate cable lugs up to 400sqmm. To install MV HV cable lugs with cross sectional areas 500sqmm and up to 630sqmm we can recommend the Cembre ECW-H3D crimphead coupled with the hydraulic PO7000 foot pump or B70M-P24 portable 24v electro-hydraulic pump.

The Pfisterer Sicon range of mechanical shearbolt cable lugs, terminals and connectors are suitable for the connection and termination of MV HV cables up to 66kV with copper or aluminium conductors (stranded circular, solid, sectoral shaped) without requirement for crimping tools – installed using no specialist jointing tools. The stepless shearbolt cable lugs have no predetermined breaking points in the thread ensuring the optimum thread load is achieved without protusions or need for conductor filing by the MV HV jointer.

T&D are Approved Vendors of Electricity North West Approved Materials List & Assessed Products to enable the cable jointing, termination, distribution and installation of LV, MV (11kV-33kV) & HV cables onto ENW cable network from manufacturers including:

➡ Further Reading: Electricity North West Approved | Cable Joints, Terminations & Electrical Equipment LV HV

JOINT ♦ TERMINATE ♦ CONNECT ♦ GLAND ♦ CLEAT ♦ CRIMP ♦ DUCT ♦ SEAL ♦ REPAIR ♦ CABLE ♦ SPLICE ♦ INSULATE

Thorne & Derrick – Stickists & Suppliers of MV HV Joints, Terminations & Connectors

HV Cable Termination Diagnosis

Thorne & Derrick – Stickists & Suppliers of MV HV Joints, Terminations & Connectors

THORNE & DERRICK are national distributors LV, MV & HV Cable Installation, Jointing, Earthing & Lightning Protection, Substation & Electrical Equipment – we service UK and global businesses involved in cable installations, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV.

3M Scotchcast Cable Joints | Ellis Patents Cable Cleats | CMP Cable Glands

Since 1985, T&D have established an international reputation based on SERVICE | INTEGRITY | TRUST.

Contact us for 3M Electrical, ABB, Alroc, AN Wallis, CATU Electrical, Cembre, Centriforce, CMP, CSD, Elastimold, Ellis Patents, Emtelle, Euromold, Filoform , Furse, Lucy Electric & Zodion, Nexans, Pfisterer, Polypipe, Prysmian, Roxtec, Sicame, WT Henley.