Cable Joints & Terminations HV

Euromold Connectors | Properties & Performance – 40 Years of Market-Leadership

Euromold Connectors

Properties of EPDM & Silicone Rubbers

For approximately 40 years Euromold has been formulating and moulding rubber compounds. The knowledge and skill gained over this extensive period has overcome many obstacles and are a great asset for the future of the brand and the Euromold connectors.

The resultant hydrocarbon-based elastomers have all advantages of general purpose rubbers but its performances excel in electrical strength and resistance to environmental conditions.

The silicone rubbers used by Euromold connectors in its cold-shrinkable and slip-on terminations have been selected for their excellent tracking resistance as well as their unique hydrophobic properties.

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 66kV as well as their Euromold connectors.

OZONE/CORONA RESISTANCE

The outstanding resistance to corona is due to the ability of the EPDM rubber to withstand ozone and other chemical compounds formed by discharges and its resistance to heat.

CHEMICAL RESISTANCE

Products made from EPDM rubber resist attacks made by many acids, alkalis, detergents, phosphates, esters, ketones, alcohols and glycols. They give particularly outstanding service in the presence of hot water and high pressure steam. Like all hydrocarbon-based elastomers, EPDM is not resistant to hydrocarbon solvents and oils or chlorinated hydrocarbons.

RADIATION RESISTANCE

EPDM connectors are also installed in nuclear containment areas.

RESISTANCE TO MECHANICAL ABUSE

EPDM rubber has good resistance to compression, cutting, impact, tearing and abrasion over a wide temperature range.

ELECTRICAL PROPERTIES

OTHER Euromold PROPERTIES

RESISTANCE TO THE ENVIRONMENT

EPDM rubber has properties comparable with the best speciality elastomers in resistance to weather. Accelerated life and salt spray tests suggest excellent properties which have been proven in practice by more than 40 years experience in widely varied applications all over the world. Silicone rubber has outstanding long-term resistance to weather in aggressive environments (industrial, coastal and desert climates).

RESISTANCE TO WATER

Water has little effect on the properties of EPDM hydrocarbon rubber. Even long immersion in hot water results in minimal loss of tensile strength. Tests also show a very low degree of water absorption. Silicone rubbers retain their surface hydrophobicity which is a considerable advantage for outdoor applications.

INTERNATIONAL PROTECTION CLASS

By design, Euromold connectors are protecting live elements of the connection against ingress of dust and water. The protection class per IEC 60529 is IP67.

PROPERTIES OF SILICONE LUBRICANT

The high viscosity silicone grease has been chosen for both its lubrication and dielectric properties. It is used as a lubricant when installing all premoulded rubber accessories on epoxy bushings as well as on the core insulation of dry cables.

Its selection is the result of several years of evaluation by Euromold of many types of silicone grease. Silicone grease displays a high level of long-term lubricating stability avoiding any ageing effects (e.g. the risk of sticking).

It also offers excellent dielectric properties assuring good performance at high voltage interfaces. In addition, the grease contributes in making interfaces watertight. It is completely compatible with all premoulded rubber accessories as well as with polymeric insulated cables.

USES

Use of this grease has proven to be of value in the installation of accessories in series and for operations such as greasing interfaces after disconnection. The installation instructions included in each product package detail clearly the application of the silicone grease.

ELECTRICAL STRESS

ELECTRICAL STRESS IN CABLES

The design and construction of screened power cables is primarily based on two types of electrical stress – a radial stress which can be represented by flux lines and a longitudinal
stress on the surface of the insulation where the screen has been removed. (Fig. 1).

ELECTRICAL STRESS RELIEF

When the semi-conductive screen is cut, the electrical field distribution changes radically. The surrounding air and the dielectric material in the vicinity of the cut screen become overstressed (Fig. 2) and breakdown of the cable will soon occur. To avoid this, we control the equipotential lines by installing a termination with a stress cone (Fig. 3), a termination
with linear stress relief (Fig. 4) or a separable connector (Fig. 5) at the end of the screen.

The terminations will make sure that equipotential lines are sufficiently far apart when they finally emerge into the air and that they will not cause ionization. The separable connector keeps the equipotential lines inside the cable/connector assembly in a controlled way. This stress relief is automatically built into all the accessories by the precision moulding of conductive and/or insulating EPDM/silicone rubber.

Nexans Cable Accessories

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

The JTS Joints and MONO Terminations are increasingly preferred and adopted by NERS Accredited Independent Connection Providers (ICPs) working on 11kV private networks.

2DIREKT from PFISTERER | Cable Connections & Terminal Clamps for Transformer Bushings & Busbars

2DIREKT from PFISTERER – Connection Terminal For Distribution Transformers

Thorne & Derrick | Approved Pfisterer Supplier | UK & Export Sales

2DIREKT from PFISTERER

Simple, Safe, Versatile Connectors

In modern substation engineering, cable connections are increasingly implemented using screw technology. The 2DIREKT terminal clamp by PFISTERER is a solution for connections to transformers and busbars.

2DIREKT combines simple installation with a compact, cost-effective design.

Almost 100 years of contact technology experience and innovations for easy and safe installation are in every 2DIREKT terminal block.

Connects directly to transformer bushing or busbar

The 2DIREKT clamp is connected directly to the distribution transformer. It screws onto the transformer bushing and is secured via a clamping groove and clamping screw. This reduces the amount of installation work and the risk of connection errors.

No cable lugs have to pressed on, and no wire-end ferrules have to be fitted. There are fewer points of contact and transition resistance is minimised.

The 2DIREKT A version allows cables to be connected directly to busbars. Fine grooves on the underside of the clamp enables connection without additional components directly on the busbar.

The 2DIREKT is connected directly to the distribution transformer, making palm terminals, cable lugs, sleeves and nuts redundant

Safety during installation and operation

The patented conductor connection system eliminates damage to the conductor during installation. A rotating plate on the base of the clamping bolt prevents individual fine-wire conductors from being damaged or even cut off. During operation, the plate functions like a spring and ensures constant contact pressure.

One clamp for all cross-sections

The 2DIREKT clamp can be used for multiple cross-sections. Various versions are available for cross-sections of 16-95 mm², 35-240 mm² and 185-400 mm². All forms of class 1, 2 and 5 copper conductors as well as class 1 and 2 aluminium conductors can be connected.

This makes the 2DIREKT not only practical but also cost-effective. The right clamp is always available on site, and stock keeping is much simpler. 2DIREKT clamps are electrically type-tested in accordance with IEC 61238-1 class A.

Compact, sophisticated design

2DIREKT offers two cable outlet directions in one body. The clamping channel and the threaded hole for the clamping screw are identical, so the conductor can be connected at a 90° angle if required. This ensures easy installation even in confined environments.

2DIREKT

Benefits

• Conductors can be connected vertically and/or horizontally
• Connection without wire-end ferrule or cable lug
• Individual strands are not damaged
• Reduced space requirements
• Removable connection
• Installation with standard tools, no compression required
• Range-taking: fewer different types means simpler stock keeping

2DIREKT Facts

• Voltage: up to 1 kV
• Current: up to 4 kA
• Conductor cross-section: 16 to 400 mm²
• Conductor: aluminium class 1 and 2, copper class 1, 2 and 5 (fine wire)
• Transformer clamp for bushings per DIN EN 50386

Connection for busbars

The 2DIREKT A version allows cables to be connected to busbars. The clamp is mounted directly on the busbar. Fine grooves on the underside of the clamp make line contact, ensuring very good power transmission that remains stable over time with minimal contact resistance. Depending on the installation situation, 2DIREKT A is available with a through hole, threaded hole or stud bolt.

Further Reading

• ISICOMPACT from PFISTERER | Branch Terminals for LV Cables & House Service Connections
• Insulation Piercing Connectors LV for Low Voltage Live Working & Cable Jointing

THORNE & DERRICK

Thorne & Derrick stock and distribute PFISTERER CONNEX Connectors for medium / high voltage cable connection and termination to electrical systems up to 33kV – we provide competitive prices for PFISTERER CONNEX connectors used to terminate and connect polymeric insulated MV-HV cables into gas insulated switchgear and electrical equipment from extensive UK stocks.

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 

The SEANEX inner cone solution is an offshore variant of the successful Connex HV connection system that is specially adapted for 66kV inter-array cabling.

MV Connex Products | Ex Stock Thorne & Derrick | Inner Cone Cable Connectors 33kV

Advanced Power Services Awarded 3M Qualified Electrical Construction Contractor Accreditation (QECC)

3M QECC

Advanced Power Services is the first company in the UK to be awarded the Qualified Electrical Construction Contractor Accreditation (QECC) from 3M.

Advanced Power Services is the first of a very small number of companies across the UK to be selected by 3M based on qualifications, experience and assessments on skills.

Since 1985, Thorne & Derrick have been Approved Distributors for 3M Electrical Products (LV HV) and whilst the competitive supply of product from stock on short lead times is essential to the contractor it is equally vital that 3M product reputation is preserved through the correct installation of products in accordance with 3M recommendations.

Until now the market has been largely unregulated until the 3M QECC launch. Advanced Power Services are proud to represent 3M in the marketplace and pleased to champion their first adopter of the QECC warranty program.

Advanced Power Services qualified and skilled Jointing Teams have completed in-depth assessments along with theoretical training on each 3M Medium Voltage product family that qualifies for the warranty.

Advanced Power Services qualified and skilled Jointing Teams have completed in-depth assessments along with theoretical training on each 3M Medium Voltage product family that qualifies for the warranty.

Training included Cable Theory, Joint Theory, Termination Theory, 3M Material Science and hands-on training & assessments. In addition to this, 3M will also provide continuous updates and refresher training as per the market requirements.

The QECC Certification enables Advanced Power Services to issue a 20-year product warranty to their clients on each new installation completed by our certified Jointing Teams.
Lee Burrell, Managing Director of Advanced Power Services said;

“I have been working with 3M now for a many years providing feedback on their products and over time we have built up a very good relationship. This new programme we hope will bring confidence to clients that our in-house, experienced jointers installing products on their network are competent, skilled, trained and qualified. This programme will strengthen our clients’ and consumers’ confidence when utilising our services on their networks and investing long term in their assets.”

This will change the landscape for Medium Voltage products.

Who would not want a 20-Year Warranty that provides value for money and peace of mind on their investment?

This will be invaluable for maintenance departments and private networks as any product failure will be covered by the 3M QECC Extended Warranty.

Each 3M Medium Voltage product family that qualifies for the warranty will be recorded in detail so that they can be properly referenced in the unlikely event of a failure to assist in any investigation.

As part of the QECC programme, contractors receive in-depth 3M product and technology training, including theoretical training on 11kV, 22kV, 33kV and 52kV joints, terminations and Separable Connectors.

Advanced Power Services is excited to be able to offer this amazing 20-Year Warranty to all their existing clients and welcomes new relationships with those interested in our cable jointing and testing services.

Choosing a 3M QECC certificated company allows you to have peace of mind that the contractors you’re working with are trained to the highest level and backed by an extended 3M 20-year product warranty.

Advanced Power Services

Advanced Power Services was established as a specialist electrical contractor in July 2010. Our ambition was to create a team of committed cable jointing and testing professionals that fully understands their clients’ needs and are dedicated to delivering exceptional service, safely and within budget.

Advanced Power Services offer Cable Jointing, Terminations, Commissioning and Fault Rectification Services for EHV, 132kV ,275kV, 400kV, HV 66kV and MV, 11kV, 22kV, 25kV, 33kV, 52kV throughout the UK and overseas. Our Jointing and Testing Teams are experienced in working within the Railway Networks, Infrastructure Networks, Renewable Energy, Private Networks, Datacentres and Shipping Industries.

For further details please contact Business Development Manager, Heather Andrews at [email protected] or 07754 855938.

3M Electrical | Scotchlok | ColdShrink | Scotchcast Resin | Scotch Electrical Tapes

Supplying Cable Termination, Jointing, Pull-in & Electrical Equipment up to 66kV

Thorne & Derrick distribute the most extensive range of MV HV Medium & High Voltage Cable Joints, Terminations & Connectors from manufacturers including 3M, Prysmian, Nexans Euromold, Elastimold, Pfisterer CONNEX and Shrink Polymer Systems.

Heat shrink, cold shrink, push-on and slip-over cable accessories enable the jointing, terminating and connection of 11kV-33kV and 66kV-132kV cables to oil, air or gas insulated switchgear, transformers, motors and overhead lines distributing electricity at MV HV.

MV HV High Voltage Cable Joints | Cable Terminations | Cable Connectors | Distributed from Stock | UK & Export Sales

ATEX | High Voltage Power, Lighting & Heating for Substation Battery Rooms

Image Credit: Eclipse Power Networks

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

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  Thorne & Derrick, Specialist UK Distributors of LV HV Jointing, Earthing, Substation & Electrical Eqpt up to 66kV, provide expert technical specification, customer support and product supply from stock of an extensive range of Hazardous Area Electrical Equipment – this includes Power, Heating & Lighting products with ATEX Certification for installation in Substation Battery Rooms.

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Substation Battery Rooms

What’s The Risk?

Explosive Flammable Gases/Vapours 

UK DNO’s detail safe working procedures and rules in their Document Manuals to be followed when working on alkaline or acid substation batteries and storage rooms located within primary network medium/high voltage substations (MV HV).

Lead-acid type batteries release potentially explosive hydrogen gas when charging – this is the primary explosive risk associated with medium/high voltage substations.

ATEX

Consequently, these worksite locations are classified as hazardous area Zones according to the ATEX Directive – a “hazardous area” is defined as an area in which the atmosphere contains, or may contain in sufficient quantities, flammable or explosive gases, dusts or vapours. The Zone designation depends on the level of risk and likelihood of flammable gas, vapour or mist forming during normal operation.

ATEX is an abbreviation of “Atmospheres Explosibles” and is a set of European Union regulations that are designed to ensure the safety of electrical products being used in potentially explosive atmospheres.

Thorne & Derrick, Experts in Equipment for Explosive Atmospheres, provide Zone 1/Zone 2 (Flammable Gas) ATEX Compliant electrical equipment for installation in substations and battery rooms to provide heating, lighting and power distribution.

The Danger Zones 

The main Dangers to Persons carrying out work or testing on batteries and chargers are electric shock, explosion or burns arising from the ignition of flammable gas which is emitted by cells during the charging process.

Flammable gas can be ignited by naked flames (eg “hot-working” by cable jointers), cigarettes or by sparks if cell terminals are accidentally earthed or shorted together.

This short-circuiting releases dangerous levels of heat, light and arc energy.

Consequently, electrical equipment installed in MV HV substation battery rooms should be Zone 1 or Zone 2 certified according to ATEX Directive for safe installation in such potentially explosive atmospheres.

♦ Primary Network Substation: a 132kV, 66kV, 33kV or 25kV substation including directly associated 66kV, 33kV, 25kV, 11kV and 6.6kV switchboards at transformer stations (Definition: WPD Engineering Specification EE Spec 25/5).

lIGHT | hEAT | pOWER

How We Can Help?

♦ Lighting – T&D can provide lighting designs to ensure lux levels are achieved in line with regulations, fittings are located correctly and meet certification requirements – we provide a comprehensive hazardous area lighting system design service.

PIR Motion Sensors

♦ Heating – T&D can provide battery room heat loss calculations to ensure the correct heaters are specified and meet ATEX certification requirements to provide adequate comfort heating to the substation.

♦ Power – T&D can specify and supply from stocks Joints & Terminations for the connection and energisation of high voltage power cables to switchgear and transformers up to 66kV.

• Raytec | Light Fittings
• Abtech | Junction Boxes
• Craig & Derricott | Isolators
• EXHEAT | Heaters
• Marechal | Plug & Sockets
• Crowcon | Gas Detectors
• Technor | ATEX Enclosures & Control Equipment
• Roxtec | Cable Transits
• Hawke | Cable Glands

The ATEX PIR detector is a movement sensor that detects a moving body heat (infrared) signature and provides an alarm output signal to the alarm/monitoring system accordingly within the substation battery room.

Extensive Stocks | Competitive Prices | HV Joints Terminations Connectors for GIS

Lighting Design & Specification Services

The SPARTAN range of Standard & Emergency ATEX Certified light fittings manufactured by Raytec is designed for lighting hazardous areas which require high performance, high reliability, energy-efficient brilliant “White-Light” illumination using latest LED technology.

Pictured | Stocked by Thorne & Derrick, the SPARTAN WL168 Zone 2 Intelligent Emergency Linear Luminaires improve light levels on this substation battery room site. On this project, the lighting brief was to replace x 4 existing 2x58W fluorescent Zone 2 fittings. The customer originally requested 5ft LED Linear alternatives, but due to SPARTAN’s high lumen output and unique modular design – which would make any ongoing maintenance quick and easy – SPARTAN WL168 provided the ideal solution. Discuss your requirements with us.

The EXHEAT range of FAW heaters provides versatile air warming to battery rooms with 250W to 3kW ratings – the electric heaters are certified for use in hazardous areas where the explosive atmosphere is classified as a Zone 1 or 2 (IIA, IIB, IIC) gas group.

Blogs

• Jointing Cables In Hazardous Areas According To The ATEX Directive
• Sealing Cable Ducts In Hazardous Areas According To ATEX Directive
• The Temporary Hazardous Area Floodlight – Wolf LinkEx WF-300 XL LED Floodlite
• Confined Spaces – Powering, Lighting & Heating Explosive Atmospheres
• 132kV 33kV 11kV DNO Substations – A Guide To Cable Sealing By Roxtec
• Can Arc Flash Clothing Save Utility Workers Lives?

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 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.

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

Specialist Suppliers of High Voltage Electrical Equipment & Cable Accessories

WEBINAR | Nexans Power Accessories Online Training Services Session

WEBINAR

Thorne & Derrick, the UK Specialist Distributors for Nexans Power Accessories UK, would personally like to invite you to attend the ‘Online Training Session’ to help us celebrate the 4th birthday of their Normanton Training Centre. Nexans established industry-leading Training Courses provide refresher and continuous development training for existing Jointers using a combination of theoretical and practical test elements.

Sign Up Here

https://lnkd.in/ei9tyJCd

Friday 8th July at 10.30 am CEST

Presented by James Addy (Technical Manager) and Kristof Rottiers (Technology & Services Manager – Nexans), together they will cover the Jointer Training Courses available at their UK centre which is specifically tailored to enable the upskilling of cable jointers from LV to MV 11kV, 33kV and 66kV.

Competency Test demonstrations will be carried out and you will get the chance to discuss your Jointer Training requirements with the experts.

Nexans Cable Accessories | Connecting MV Substations | Switchgear | Transformers

Thorne & Derrick stock and distribute the full range of Medium Voltage Cable Accessories manufactured by Nexans in heat shrink, cold applied slip-on and EPDM rubber technology – this includes MONO Terminations, JTS Joints and Euromold Connectors up to 33kV.

Contact our trained team of Technical Sales Engineer for competitive quotations and delivery from stock.