Cable Joints & Terminations HV

Innovation : Heat-Shrinkable Joint with Triple Layer Tube By Nexans

Nexans JTS Heat Shrink Joints

JTS Triple Wall Heat Shrink Joints

By Nexans

Simple & Shorter Installation Time with Reduced Risk of Failure

• Republished Article From Transmission & Distribution - Australasian Power Technologies By Nexans Australmold

The Nexans Italy site of Offida launches the JTS, its new heat-shrinkable joint with triple layer tube. The triple layer heat shrink tube represents a technical innovation that allows MV cable jointers to heat only 1 tube instead of 3 for 12kV to 24kV applications, and 2 tubes instead of 3 for 36kV to 42kV cable jointing applications.

Nexans have reduced complexity and the time to install the cable joint, while improving the quality of the global connection by reducing its operations. The new range of Nexans JTS heat-shrinkable medium-voltage straight joints is compatible with MV single- or three-core polymeric cables with copper wire screen, copper tape screen or with aluminium tape screen.

For 12kV to 24kV applications, the Nexans JTS 17/24 heat-shrinkable joint is the new high performance, compact and easy-to install joint: a single body with all electrical functions integrated!

The JTS 17/24 is using the Nexans “TRIPLE GT125”, an integrated stress control field, insulating and conductive tube, which can support voltage classes up to 24kV.

A double layer pad with conductive rubber inside and HK orange mastic outside ensure a Faraday cage and smooth the effect of the electrical field and of the voltage gradient in the connector area.

For ANZ customers, the electrical continuity of the screen is ensured by copper screened mesh and two mechanical shear-off screen links. Finally, the outer sheath is restored with heavy wall adhesive lined tubing. MC types are supplied with GPH® mechanical connectors.

For 36kV to 42kV applications, the Nexans JTS 36/42 heat-shrinkable joint is also a high performance, compact and easy-to-install cable joint: double bodies with all the electrical functions integrated!

The JTS 36/42 is using an integrated coextruded “stress control field + insulating” (DUAL GT12) nested in a coextruded “insulating + conductive” tube (DUAL GT25), which can support voltage classes up to 42kV.

All the rest is the same as the 17-24JTS.

Nexans Italy in Offida has an extensive know-how in the fields of heat-shrinkable materials, as well as mastics. The heat-shrinkable (HS) technology dates from the 1960s. In Nexans, thanks to a strong R&D activity, the heat shrink technology has been improved and tailored for 50 years, according to the evolution of the market needs.

Today, Nexans produce a complete range of heat shrink tubes to cover Low (LV) and Medium (MV) voltage cable jointing applications up-to 52kV in our Extruders/Expanders lines, with diameters starting from 20mm till 300mm and up to 4 different layers.

Mastics for electrical use: the complete range of Nexans mastics have been developed and are manufactured totally in the company. They are produced by means of a 630 litre mixer in a dedicated part of the plant. Resins for electrical use, casting and insulating have been designed by Nexans Italy for more than 35 years.

Nexans R&D team of engineers and technicians use the most advanced tools and equipment to create, verify and test all our products among the different laboratories and material research centres of the Nexans Group.

Nexans Power Accessories Italy is well equipped to perform physical and chemical analysis of insulating, anti-tracking, and stress control materials, both for tubing and mastics. We supply jointer training and failure analysis for all our customers. In the electrical laboratory we can perform type test and routine test (PD measurement at hot and ambient temperature, heating cycles in air and water, humidity and salt fog). For steel wired armour cable and termite protection please contact your local sales office.

NEXANS JTS 17/24KV

NEXANS JTS 36/42KV

Nexans JTS Heat-Shrinkable joint

Features & Benefits

• Tube nesting / positioning and parking issues eliminated => typical cable jointing errors eliminated
• Only one tube to shrink for the 3 functions (stress control – insulation – conductive) for voltage classes 12/17kV & 24kV
• Only two tubes to shrink for the 3 functions (stress control – insulation – conductive) for voltage classes 36kV & 42kV
• Reduced installation time / training time, with standard cable preparation tool work
• Simplified stress control with 2-layer plate as used with Nexans cold shrink joints => no need to conform the mastic before shrinking the tube
• Design adapted for all type and brands of mechanical / crimping connectors

Nexans JTS Heat-Shrinkable joint

highlights

• Short and slim design cable joint
• Quick and easy to install for medium voltage power cable systems
• Excellent electrical insulating properties
• Advanced screen connection and armour continuity of MV joint
• Heavy wall tubing for high mechanical strength and impact resistance
• Proof against water penetration and chemicals aggression
• Stabilised UV protection of the cable
• Halogen-free material content
• Compliant to reach regulations
• Premium technical support up to medium/high voltage classes
• Made in EU

Nexans manufactured Cable Accessories are in extensive service throughout the UK DNO power grid – the Euromold brand of separable connectors are approved and are approved by several DNO/IDNO operators dependent on the product, voltage and network.

Nexans joints and terminations are increasingly preferred and adopted by NERS Accredited Independent Connection Providers (ICPs) working on 11kV private networks.

Thorne & Derrick have an International Distribution Agreement with Nexans Power Accessories UK and are their main stockists and suppliers for their range of Heat Shrink Joints & Terminations up to 33kV.

ANSI Connectors | Screened Separable Connectors from Cooper Power Systems

ANSI Connectors | Medium Voltage Power Cable Connectors for Transformers & Switchgear Bushings from Cooper Power Systems

Cooper Power Systems Separable Connectors (ANSI) & Bushings are rated for 15kV, 25kV and 35kV medium voltage power systems in accordance with the following ratings.

What is ANSI?

The American National Standards Institute is a private non-profit organization that oversees the development of voluntary consensus standards for products, services, processes, systems, and personnel in the United States.

ANSI Separable Connectors are waterproof cable connectors that can be easily installed – these cable accessories use imported high quality EPDM rubber for reliable field performance and are widely used in pad-mounted switchgears and pad-mounted transformers on MV Power Systems. 

Connectors & Bushings from Cooper Power Systems

For further information download the Cooper Power Systems catalogue.

Standard Interfaces For Separable Connectors and Components
Certified Tests and Performance
Conductor Sizing
AEIC Insulation Diameter Chart
ICEA Insulation Diameter Chart
200 A Loadbreak Connectors
200 A Deadbreak Connectors
200 A Stacking Dimensions
Clēēr 600 A Loadbreak Connectors
600/900 A Deadbreak Connectors
600/900 A Components and Replacement Parts
600/900 A Connector Systems
600 A Stacking Dimensions
Junction Bars/Cable Transition and Oil Stop Modules
Splices
Underground Surge Arresters
Tools & Maintenance
Bushings
Fusing
MagneX Single-Phase Interrupter
MagneX Three-Phase Interrupter
Faulted Circuit Indicators
Sectionalizing Cabinets
Part Number Index
Support Available When You Need It
Product Application Overhead and Underground Distribution Systems

Connectors

Eaton’s Cooper Power Systems 200 A and 600 A connector products are designed for applications on XLPE, EPR or other solid dielectric insulated underground electrical cables. In order to maintain a reliable termination, the cable accessories must be sized correctly with the cable conductor size and cable insulation diameter.

The cable conductor size is used to determine the compression connector used. Proper sizing is important to ensure reliable current transfer from the underground cable conductor to the elbow connector.

Conductor diameters are dependent on the conductor size in AWG or kcmil, and conductor type (stranded, compressed, compact or solid). The cable insulation diameter (the diameter over the insulation) is critical because it is important to maintain a tightly sealed fit between the cable insulation and the elbow housing at the cable entrance. As the insulation thickness changes, so must the range of the cable accessory. Cable insulation diameter can be determined from the cable manufacturer’s specification, or by referring to pages 8 (for cable made to the AEIC Standard including the ± 0.030 inch tolerance) or 9 (for cable made to the ICEA Standard) for minimum and maximum diameters.

ANSI Connectors | MV Medium Voltage Power Cable Construction

Thorne & Derrick

Contact us for Competitive Prices & Fast Delivery from Stocks for Heat Shrink, Cold Shrink & EPDM Rubber Connectors, Joints & Terminations up to 66kV.

Thorne & Derrick International are specialist distributors of LV, MV & HV Cable Accessories, Jointing, Substation & Electrical Equipment – servicing UK and global businesses involved in cable installations, jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV, 66kV and EHV.

Stocking & Supplying | Duct Seals | Cable Cleats | Cable Glands | Electrical Safety | Arc Flash Protection | Jointing Tools | Cable Pulling Eqpt | Earthing & Lightning Protection | Feeder Pillars | Cable Joints LV | Joints & Terminations MV HV

MV Cable Leads | Pre-Terminated Medium Voltage Cable Leads for 33kV Power Networks

Cable Leads MV 33kV

MV Cable Leads

Pre-assembled custom, ready-to-install MV cable leads manufactured by Nexans are available equipped with Interface “A” to “F” separable connectors and terminations (Heat Shrink, Cold Shrink and Slip on). Cable types available are standard MV XLPE and Class 5 Flexible cables. Just contact Thorne & Derrick and specify connector/termination type, cable type and length and we provide competitive prices and short lead times for the delivery of custom MV cable leads – assembled and tested. Typical applications for cable leads include connecting between MV distribution transformers and electrical switchgear. Testing options available include Megger, HI Pot (AC withstand to 72kV) and partial discharge (PD). Contact us with your requirements.

MV Cable Lead | Here a medium voltage (MV) cable in shown terminated using Nexans AFN Slip-on Cold-applied Cable Termination with Screened Separable Connector for connection to MV switchgear, transformer or electrical equipment up to 33kV

Thorne & Derrick

Nexans Main UK Stockist & Distributor

Contact us for Competitive Prices & Fast Delivery from Stocks for Heat Shrink, Cold Shrink & EPDM Rubber Connectors, Joints & Terminations up to 66kV.

Go to our Price List and contact us with your enquiries.

Heat Shrink Cable Accessories for 11kV Triplex Cables

Thorne & Derrick International are specialist distributors of LV, MV & HV Cable Accessories, Jointing, Substation & Electrical Equipment – servicing UK and global businesses involved in cable installations, jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV, 66kV and EHV.

Stocking & Supplying | Duct Seals | Cable Cleats | Cable Glands | Electrical Safety | Arc Flash Protection | Jointing Tools | Cable Pulling Eqpt | Earthing & Lightning Protection | Feeder Pillars | Cable Joints LV | Joints & Terminations MV HV

Euromold MV HV | Cable Terminations, Connectors, Elbows & Joints

MV ‘Backup’ Fuses (Current Limiting Type) Are Not Rated For ‘Overload’ Current Interruption

MV ‘Backup’ Fuses

From IEEE Std C.37.48.1
“MV backup fuses can interrupt any current between its rated minimum interrupting current and its rated maximum interrupting current. If a backup fuse is melted open at a current level less than its minimum interrupting rating, the fuse is not required to, and may not successfully, interrupt the circuit. In this case, the fuse melts open at only a few places, often a single point, along the length of the element. Burn back of the element proceeds very slowly, as the arc heat causes the sand to melt and form a resistive fulgurite. During arcing conditions, a large amount of heat is released in a limited area within the fuse. This heat can prevent the sand and the resultant fulgurite formed in the sand from developing dielectric properties needed to withstand circuit voltage. As a result, the fuse may fail to interrupt the current and be destroyed as it attempts to clear.”

Solution(s): Include a protective device in series which is rated for overload operation (increase back-up fuse size to get out of the zone), employ full range fuses.

In this case, an upstream SF6 breaker was able to be coordinated with the needs of the CL fuse – here the fuses are immediately ahead of the transformer primary.

Guest Post by Matthew Denis | Principal Engineer at Rockwood Engineering (Ontario Canada)

Services | Medium Voltage Electrical Power System Design & Analysis | Power System Analysis including: Protection Coordination, Arc Flash, Short Circuit, Harmonic & Load Flow | Power Quality Assessment/Mitigation | Power Distribution Design (Industrial, Utility, Commercial, Agricultural), Medium Voltage Power Systems Design

MV Fuses | Thorne & Derrick distribute the complete range of ABB Medium & High Voltage Fuses (MV-HV) for the protection of 11kV & 33kV switchgear, transformers, cables and substations.

Definition: MV Back-up Fuses by ABB

Current limiting back-up fuses. The current limiting fuse family is generally composed of three different fuse groups: back-up fuses, general purpose fuses and full range fuses. All of them limit the value of prospective short-circuit currents during the interruption process, thereby extending the life time of nearby installed electrical equipment. The main difference is in the minimum breaking current that characterizes the lowest fault current that the fuses are capable of interrupting. This value is generally highest for back-up fuses, slightly smaller for general purpose fuses and smallest, with the value close to the minimum melting current, for full range fuses. But reaction time is critical for the protection function. That is why back-up fuses, with an interruption time for the minimum breaking current in the range of a few seconds down to a few tense of milliseconds, are the most commonly used. The total clearing time in cases of high short-circuit currents is even shorter i.e. only a few milliseconds. That is why back-up fuses can be used as typical overload protection elements. General purpose and full range fuses capable of interrupting even the smallest values of currents can only be considered as over current devices since the interruption time is greater than one hour. Therefore, these types are used rarely and are usually recognized as a separate element of protection, without any linkage to the opening function of load break switch. ABB current limiting fuses have low minimum breaking currents, i.e. close to three times the rated current In.

WHITEPAPER: World’s First 2-Pole HV 13.8KV Non-sparking Generator For Use In Hazardous Areas

Power Generation Equipment In Hazardous Areas

First 2-Pole HV 13.8KV Non-sparking Generator

The BRUSH Group are proud to announce this ground-breaking technological advancement with the official issue of the first in a new series of White Papers, detailing the development and new industry standards surrounding the world’s first Non-sparking 2-pole generator.

This application-led solution reduces procurement, operation and maintenance costs on generators and associated equipment installed in explosive environments.

Launched at the FPSO World Congress event by Roy Beardshaw, BRUSH’s Head of Engineering, the paper details the current industry standards and how this exciting new development can change the use of power generation equipment in hazardous areas.

Chris Abbott, CEO of BRUSH commented: “the innovation that BRUSH has made with the non-sparking high voltage generator truly leads to a step change in the operational flexibility and cost for power generation units in hazardous environments.”

The paper focusses on the limitations of the current industry approach and how this innovative solution not only brings exceptional safety levels, but also offers operators significantly lower running, maintenance and ownership costs.

The intelligent, new BRUSH 2-Pole HV Non-sparking Generator design has gained independent approval and been classed as non-sparking for Zone IIA and IIB gas applications. These are typical operating environments on the open deck of oil rigs, FPSO’s (Floating, Production, Storage and Offloading) vessels and many chemical processing plants.

World’s First Non-sparking 2-pole Generator

WHITEPAPER CONTENTS

• Application Focus: FPSOs and Oil Rigs
• Severity of Risk: Operating in Explosive Environments
• The Current Approach: Evolution, Limitations and Cost Implications
• The BRUSH Innovative Solution: 13.8kV Non-Sparking Generators
• Testing and Inspection to EN 60079-15: Verification and Validation
• Industry Benefits: Reduced Footprint, Faster Start-Up and Lower Maintenance Costs
• Reduced Plant Footprint, Lower Power & Reduced Lifetime Operational Costs
• Setting New Industry Standards for Power Generation in Hazardous Environments

To download the White Paper in full and see how industry standards in power generation within hazardous environments will never be the same click the image below.

DOWNLOAD WHITEPAPER HERE

ABOUT BRUSH

The BRUSH Group has a long and rich history serving power generation customers as an OEM of generation, control, and distribution products. While primarily known for supplying industry leading turbo-generators and power management systems, BRUSH also designs and manufactures transformers and switchgear of equally high quality.

Today, the integrated companies operate as “One BRUSH” with competency centres for 2-Pole & 4-Pole generators, power management and control systems, transformers, switchgear, and OEM services. BRUSH serves the global power generation and distribution markets with a strong foundation of technical knowledge to support grassroots projects, capacity expansions, and drop-in-replacements.

Thorne & Derrick

T&D are Specialist Distributors to UK Distribution Network Operators (DNO’s), NERS Registered Service Providers, ICP’s and HV Jointing Contractors of an extensive range of LV, MV & HV Jointing, Earthing, Substation & Electrical Eqpt – this includes 11kV/33kV/66kV cable joints, terminations and connectors for both DNO and private network applications.

Contact our UK Power Team for competitive quotations, fast delivery from stock and technical support or training on all LV-HV products.

All international sales enquiries can be serviced and supplied by our Export Power Team.

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 HV