Cable Joints & Terminations HV

DNV GL Approved Cable Accessories, Joints, Terminations & Connectors from Nexans

Thorne & Derrick distribute DNV GL Approved Cable Accessories manufactured by Nexans including  elbow connectors and cable terminations for the reliable distribution of medium and high voltage power in the marine and offshore sectors up to 33kV.

This article and download brochure provides information on DNV GL Certification and the Nexans Euromold products qualified according to this classification society.

Products approved by the DNV GL Certificate are accepted for installation on all vessels classified by DNV GL.

For the full list of Nexans products with DNV GL approvals, please refer to the download.

Power Cable Accessories

DNV GL Approved

Nexans is the leading European manufacturer of prefabricated cable accessories for medium voltage (MV) and high voltage (HV) energy distribution. Products include MV-HV Connectors and Joints & Terminations to connect, splice, repair and maintain medium/high voltage cable and power distribution systems.

Bushings | Separable Connectors | Cable Terminations | Cold Applied & Heat Shrink

Cable Accessories

WITH DNV GL APPROVAL

A DNV GL Type Approval Certificate states that the design of a product type is in conformity with specified requirements. The Type Approval Certificate confirms compliance with the DNV GL Rules in force at the time of certificate issuance.

To obtain DNV GL approval, DNV GL experts verify the manufacturing processes for compliance with the Classification rules and further relevant standards. During this verification, the manufacturer has to demonstrate and prove the following 4 qualification criterion for DNV GL Certification to be issued:

• They have suitable facilities for manufacturing, testing and inspection;
• The manufacturing is carried out by qualified personnel;
• Constant monitoring of product quality has been established.

THORNE & DERRICK

Thorne & Derrick are national distributors of LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment – servicing businesses involved in cabling, jointing, substation, earthing, overhead line and electrical construction at LV, 11kV, 33kV, 66kV and EHV. Supplying a complete range of power cable accessories to support the installation and maintenance of low/medium and high voltage cable systems:

• Slip-on Cable Terminations
• Cold-shrink Cable Terminations
• Heat-shrink Cable Terminations
• Cable Joints – Heat & Cold-shrink
• Separable Connectors (Euromold)
• Surge Arresters & Switchgear/Transformer Bushings

Key Product Categories: Duct Seals | Cable Cleats | Cable Glands | Electrical Safety | Arc Flash Protection | Cable Jointing Tools | Cable Pulling | Earthing | Feeder Pillars | Cable Joints LV | Joints & Terminations MV 

Removal of Graphite Coating from Semicon on Medium Voltage Power Cables

Technical Note Contribution by 

Uxio Ramos

Director Técnico de Ventas / Technical Sales Director

BBC Cellpack manufacture cable connection systems and accessories for low and medium voltage power systems. This has given them a unique know-how, covering the entire range from preparation of raw materials, specification of cast resins and gels, creating the formulas for the plastics, to installation and packaging of our cable accessories.

In the photograph below the medium voltage cable end has been stripped and prepared prior to termination – the cable end is showing the different layers and also the graphite coating on the XLPE insulation not removed. Graphite coated semicon layers consist of a paper/cloth layer forming the semicon layer, which is graphite (conductive) coated and this graphite powder remains attached to the cable insulation after paper/cloth removal. The graphite must be cleaned using an approved cable cleaning solution suitable for medium voltage cable insulation ensuring no residues remain.

Cable Preparation & Jointing Tools

Cable jointing tools manufactured by Alroc for the removal and stripping of outer cable sheath, semi conductor screen and insulation from LV, MV, HV and EHV power cables.

Cable screen stripping tools are available to remove bonded semi-conductor screens from MV-HV cables and screen scoring tools available for removing peelable semi-conductor screening from medium/high voltage cables.

Cable preparation is essential to the performance and stability of MV-HV cable joints and terminations – if cables are under prepared using sub-standard tools or basic hand tools then the risk incidence of cable failure is increased.

Alroc tools have been developed in co-operation with world leading manufacturers of Medium, High & Extra High Voltage Cables to ensure their electrical performance is not comprised by poor workmanship and failure to use precision engineered, designed for purpose cable jointing tools.

Alroc | Cable Tools (LV MV HV EHV Cable Jointers Tools)

THORNE & DERRICK

Thorne & Derrick are national distributors of LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment – servicing businesses involved in cabling, jointing, substation, earthing, overhead line and electrical construction at LV, 11kV, 33kV, 66kV and EHV. Supplying a complete range of power cable accessories to support the installation and maintenance of low/medium and high voltage power systems:

• Slip-on Cable Terminations
• Cold-shrink Cable Terminations
• Heat-shrink Cable Terminations
• Cable Joints – Heat & Cold-shrink
• Separable Connectors (Euromold)
• Surge Arresters & Switchgear/Transformer Bushings

Key Product Categories: Duct Seals | Cable Cleats | Cable Glands | Electrical Safety | Arc Flash Protection | Cable Jointing Tools | Cable Pulling | Earthing | Feeder Pillars | Cable Joints LV | Joints & Terminations MV 

Subsea Power Cables For North Sea Link Interconnector Project

Subsea Power Cables

North Sea Link Interconnector Project

This is the first Blog in a series by Nexans explaining how their subsea solutions are helping to meet global demand.

The North Sea Link Interconnector project is a huge and ambitious project that involves cooperation, innovation, engineering, and lots of planning. This summer, Nexans began the major installation operations in Western Norway.

The Nexans’ land high voltage cables arrived for the North Sea Link project in Halden.

Nexans have been awarded a turnkey project covering 2x250km of 525kV HVDC subsea and land cables.

This interconnector link will be the longest subsea electricity link in the world. In the below video the five high voltage cables will be installed at the Kvilldal converter station.

Due to the logistics of this complex project the land cables must be transported first.

The vessel will now travel to the town of Sand in the western part of Norway to unload the cables.

THORNE & DERRICK

Thorne & Derrick are national distributors of LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment – servicing businesses involved in cabling, jointing, substation, earthing, overhead line and electrical construction at LV, 11kV, 33kV, 66kV and EHV. Supplying a complete range of power cable accessories to support the installation and maintenance of low/medium and high voltage cable systems:

• Slip-on Cable Terminations
• Cold-shrink Cable Terminations
• Heat-shrink Cable Terminations
• Cable Joints – Heat & Cold-shrink
• Separable Connectors (Euromold)
• Surge Arresters & Switchgear/Transformer Bushings

Key Product Categories: Duct Seals | Cable Cleats | Cable Glands | Electrical Safety | Arc Flash Protection | Cable Jointing Tools | Cable Pulling | Earthing | Feeder Pillars | Cable Joints LV | Joints & Terminations MV 

Stress Control | MV Cable Terminations by 3M Electrical

3M Electrical

Stress Control Methods

Choosing Cable Terminations to Reduce Electrical Stress

The following information has been republished with kind permission of 3M Electrical.

Traditional Geometric Stress Cone

This method reduces the electrical stress at the shield discontinuity by extending the shield and gradually increasing the thickness of insulation under the shield. The areas where there is a higher electrical stress receive additional insulation, as shown in Figure 2 below.

GEOMETRIC STRESS CONTROL

Geometric Stress Control – Figure 2

High Dielectric Constant (Hi K) Stress Control

This method lowers the electrical stress at the point of shield discontinuity by refracting the electrical stress. This allows the equipotential lines to spread out along the cable instruction interface. By doing this, the surface stress of the termination is greatly reduced, which improves cable termination performance and life expectancy shown in Figure 3 below:

CAPACITIVE STRESS CONTROL

Capacitive Stress Control – Figure 3

Geometric

Geometric

High Dielectric Constant

High Dielectric Constant

LV, MV & HV Jointing, Earthing, Substation & Electrical Eqpt

Thorne & Derrick International are specialist distributors of LV, MV & HV Cable Installation, Jointing, Duct Sealing, Substation & Electrical Equipment – servicing UK and global businesses involved in cable installations, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV.

THORNE & DERRICK Product Categories: Duct Seals | Cable Cleats | Cable Glands | Electrical Safety | Arc Flash Protection | Cable Jointing Tools | Cable Pulling | Earthing | Feeder Pillars | Cable Joints LV | Joints & Terminations MV HV 

ALU Ship Connect System | Reducing Installation Times By At Least 40%

ALUShip Cables Used In Confined Spaces Reducing Installation Times By At Least 40%

ALUminium Cables

Ship Connect System

• Republished with the kind permission of Hermod Iverson at Amokabel Norway AS 

A new alternative to copper electrical cables is offering shipowners more flexibility and a potential weight reduction of 55% per ampere.

In the race towards more environmentally friendly shipping solutions, reducing a vessel’s weight is a good way to achieve that goal. Swedish cable manufacturing company Amokabel has developed the ALU Ship Connect System, aluminium power cables that offer vessel owners and operators significant benefits.

“Until now, it wasn’t common to use aluminium cables aboard vessels.” comments Amokabel Norway CEO Hermod Iversen. “The main reason for not using the aluminium cables before is that the IEC international standards for shipboard cables only accepted copper cables. After contacting DNV GL, it was agreed that alternative solutions, in this case aluminium cables, might be accepted onboard, provided equivalent technical safety was documented by thorough testing of the cables.”

Testing and qualification of the ALU Ship Connect System was completed in May 2018 and DNV GL subsequently issued the first type approvals for aluminium cables and connectors on vessels.

The amokabel Group is a private own company group consisting of three manufacturing cable companies with subsidiary companies, producing everything from automotive wire to covered conductors.

Significant Savings

Amokabel manufactures various kinds of wires, cables and consumer-packaged products.

The company has a strong focus on quality and minimal environmental impact, and these values are the foundation of the new system.

“The main reason we started looking into the possibilities with aluminium was the environmental aspect. Copper is much heavier and with the new type of vessels, any weight reduction option is worth looking into,” explains Mr Iversen.

“Compared to copper cables, you need more or bigger aluminium cables to get the same electrical load but even taking that into account, you can save up to 55% in weight per ampere by using aluminium cables. That is a big reduction and one that can make a significant impact on the fuel consumption of a vessel. Especially when you measure it over a vessel’s lifetime.”

This weight reduction is particularly attractive for the new type of environmentally-friendly vessel being built, Mr Iversen explains. “When you have a heavy containership, the weight savings are going to make a difference but it will be comparatively small. However, on a battery-powered vessel or a high-speed ferry, the weight reduction is going to have an enormous impact. Every kilo counts on electric vessels.”

Additional Benefits 

It is not just the weight reduction that will have a positive impact on the environment. Aluminium is also a more environmentally friendly solution, states Mr Iversen, “The production of the cables is completely green, adding to the environments of using aluminium cable systems. Moreover, the cost of aluminium cables is significantly lower the copper cabling, because the material costs are much lower. Copper is a semi-precious metal. It is not cheap, and it seems a waste to just hide it on the boton of a ship for thirty years. Especially if there is a cheaper, lighter, and cleaner alternative available.”

Successful Installation

Amokabel has spent years developing the project, researching, carrying out tests, and getting certified with, and by DNV GL. The ALU Ship Connect System consists of aluminium cables and copper terminations from Mecatraction in France, “The whole system has been approved by DNV GL. The crimping technology (DBI) has been specially developed by Mecatraction and we worked very closely together to find the best solution for a reliable connection. The crimping technology is based on the combined experience from the aircraft and automotive industry.”

The aluminium power cables of the ALU Ship Connect System are much lighter and easier to install than traditional copper cables.

In 2015, Amokabel successfully installed the ALU Ship Connect System on an offshore service vessel in Norway. Another benefit of the aluminium cables became evident during installation. “Because the aluminium cables are so much lighter, they are easier to install,” details Mr Iversen. “It is not easy pulling cables inside a vessel due to the narrow and confined spaces in which they are often placed. I have received several positive comments from installers saying that our ALU cables make their job a lot easier. I would estimate that our cables can reduce installation times by at least 40%.”

Amokabel and DNV GL in March 2018 carried out a joint inspection on board the offshore vessel and found the cables were working perfectly. “There was no change in behaviour or rise in temperature in the cables,” comments Mr Iversen. Successful testing, both in laboratory and on board, showed equivalent safety levels compared with traditional copper cables.

This enabled DNV GL to issue the first type approvals for aluminium shipboard cables and terminations in 2018.” He concludes, “Our biggest challenge now is convincing ship owners and operators of the benefits of the ALU Ship Connect System. Rome wasn’t built in a day, or even a year. But we believe in our product and we believe others will too.”

Marine & Offshore Cable Accessories

THORNE & DERRICK are international distributors of LV, MV & HV Offshore & Marine Cable Installation, Jointing, Substation, Earthing & Electrical Equipment – we supply Joints, Glands, Cleats & Cable Accessories specified for use in harsh and hazardous areas to support the installation of marine and offshore fire resistant cables.

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

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

DNV

DNV is a rigorous approval system for cable accessories including joints, glands and cleats – the DNV approval process assesses all of the evidence offered by the manufacturer and compares it to the requirements of the international standard, IEC61914. Once full compliance is proven DNV Type Approval is offered.

Cable Joints

DNV Approved

Hydrocarbon Resistant | Zero Halogen & Fire Resistant

Cable Glands

Hazardous Area Explosion Proof | Zero Halogen

Cable Cleats

Zero Halogen | Fire Resistant | Stainless Steel

Also ➡ Cable Labels, Cable Ties, Cable Transits and Cold Shrink

Contact Thorne & Derrick for further information and customer service – extensive range of DNV Approved Marine & Offshore Cables & Cable Accessories available for delivery to UK and international projects.

LV MV HV – 3.3kV 6.6kV 11kV 33kV