Republished from LinkedIn with kind permission of Neil Davies | EA Technology Australia | Helping Owners and Operators of Electrical Assets Improve Reliability and Efficiency
uploaded by Chris Dodds | Thorne & Derrick Sales Marketing Manager
Neil Davies
Partial Discharge (PD) can be classified into 3 main types:
Internal Partial Discharge, occurring inside insulation
Surface Partial Discharge, tracking across insulation
Corona Partial Discharge, from a sharp electrode into gas
Internal PD is the silent defect where there will be no sound, smell or visual indication of a problem prior to failure. If you witness the aftermath of a compound insulated cable box failure, you will see how the build-up of pressure can lead to a very disruptive and dangerous explosion.
Surface PD occurs across the surface of insulation. When alternative materials to porcelain started to be introduced into switchgear and dry cable terminations started being widely introduced, some critical aspects of design and installation were not fully appreciated. This led to a spike in failure rates due to surface PD. When developed, it will produce the crackling and ozone smell.
Corona PD is what we often hear in outdoor switchyards, particularly when humid. Corona at sharp points in switchyards isn’t usually detrimental. However, if corona activity occurs inside enclosed chambers and there is no airflow to remove chemical reactions, then it can lead to the onset of surface PD and problems.
At EA Technology, we’re specialists in asset management solutions for owners and operators of electrical assets. We’re part of a global company, but bring local knowledge and advice in servicing the particular needs of the Australasian and Asia-Pacific market. This includes:
✔ Keeping ageing electricity networks operating reliability and safely.
✔ Adapting to major changes in network transformation, including smart grids, solar, wind and electric vehicles – while keeping costs down for customers.
✔ Predicting and preventing critical plant failures – literally keeping the lights on.
✔ Providing better visibility of the condition of electrical assets to allow for more informed planning and management.
✔ Investigating failure of electrical plants and assets to determine the cause and reduce future risk.
In Australia and the Asia-Pacific, we’ve been active for more than 20 years. Our teams have deep domain knowledge and provide unrivalled support to clients across Australia, New Zealand, China, and South-East Asia.
We are supported by a global team with headquarters in the UK. There, EA Technology was founded in 1966 and has a rich heritage as a ground-breaking research and development organisation serving the electricity industry.
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 HVÂ
Joints, Terminations & Connectors for MV HV Power Networks
Natalie Lundie
Press Release
08.11.19
uploaded by Chris Dodds
Sales & Marketing Manager
THORNE & DERRICK
Specialist Distributors of LV MV HV Jointing, Earthing, Substation & Electrical Eqpt
Today, it is with great pleasure that I am announcing the promotion of Natalie Lundie to Supply Chain (Marketing Lead) at Thorne & Derrick International.
Natalie has been with Thorne & Derrick for close to 7 years in her Social Media & Marketing Support role demonstrating dedication and combining commitment with outstanding success.
Over these years Natalie has achieved and maintained an exceptional personal performance – she has supported the development of our online presence by undertaking transformative work in the fields of UK and international search engine optimisation, social media strategy and digital marketing campaigns.
Natalie’s personal knowledge of and expertise in internet marketing has made an enduring and positive contribution to the business development of Thorne & Derrick.
Now as Marketing Lead of our Supply Chain, Natalie accepts the lead role and responsibility for maximising the potential business value of existing supplier relationships to both parties advantage.
Natalie will be contacting and meeting our suppliers to discuss joint marketing initiatives to increase our sales together through the attainment of agreed targets – this mutual business development effort will embrace SEO, social and digital opportunities to accelerate sales.
Strategy planning for 2020 is now underway.
We encourage all current and any prospective suppliers to contact Natalie to discuss engagement in partnership marketing with Thorne & Derrick.
Natalie will be supported by myself and our Marketing Team to develop and deliver content marketing strategies and lead generation campaigns that get results for us and for our suppliers – talk today to Natalie on 0191 410 4292.
Let us all congratulate Natalie on this well deserved promotion and wish her continued success with 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 HVÂ
uploaded by Chris Dodds | Sales Marketing Manager at Thorne & Derrick
Chuks Anugwom, MD of Nexans Power Accessories UK, would personally like to invite you to attend the ‘Nexans Power Accessories Technology Day & New Product Launch’.
Thorne & Derrick International the UK Distributor for Nexans Power Accessories are attending and supporting this Event – we’re working closely with Emma, Josh, Mark and their team to encourage attendance to this unique opportunity to visit the UK’s leading Centre for Jointer Excellency & Competency.Â
IMPORTANT & ESSENTIAL To help manage Event catering and ensure a successful 2 days please confirm if you intend to attend by sending an email to [email protected] or contacting me on 0191 4104292.
Come and meet our team:
Stay There âž¡ Recommended overnight stay by Nexans.
A free-to-attend Event with breakfast, lunch and refreshments provided to make the day comfortable.
Visitors will benefit from Nexans Power Accessories product demonstrations âž¡
See, hear and learn more about the next generation of MV Joints and watch live product demonstrations.
Nexans Technical Product Managers will be present to provide full technical product support for all of the Nexans Power Accessories up to 72.5kV.
Competency Test demonstrations will be carried out within Nexans fully shielded test facility – you can meet and discuss your Jointer Training requirements with Nexans Cable Jointer Training Centre Manager.
To help manage Event catering and ensure a successful 2 days please confirm if you intend to attend by sending an email to [email protected]
JTS Triple Wall Heat Shrink Joints
uploaded by Chris Dodds | Sales Marketing Manager at Thorne & Derrick International
A modern generation of MV Heat Shrink Joint has been developed by Nexans for the UK utility and contracting industry – the primary application is for the jointing of 11kV BS7870 Triplex type medium voltage cables.
Independent Connection Providers (ICPs) and Power Contractors now have a credible option to ensure they obtain the most competitive 11kV jointing product prices without compromising quality.
The JTS cable jointing system now provides the most cost-competitive option to power contractors: the cable joints manufactured by Nexans, “The Global Expert in Cables & Cable Systems” are tested in accordance to CENELEC HD629.1.
The internationally recognised quality standard ensures power system reliability and outage reductions when installed in accordance with the manufacturers instructions by Competent cable jointers.
The cable joints include high quality heat shrink tubes and components – the JTS range suits polymeric cables (XLPE & EPR), single core (up to 1600sqmm) with copper wire screens and voltage 11kV (Umax 24kV).
Single Tube with Triple Function
Traditionally, heat shrink joints required several separate stages for the installation of the complete cable joint with multiple layers of heat shrink tubes needed to provide stress control, insulation and conductive functions – the labour intensive jointing procedure introduced increased risks of jointer error including tube misalignment and flamework deficiencies (scorching of tubes by overheating).
The Triple Wall design of the JTS Joint reduces installation times with corresponding labour savings.
The triple extruded heat shrink tube with integrated stress control provides compact installation with reduced components and excellent water sealing for direct burial into underground cable trench.
Mechanical connectors are included for fast jointing of conductors without resort to hydraulic crimping tools and associated die sets.
Stocked and distributed in the UK, the cable joints are now available from Thorne & Derrick with complete technical support, fast quote service and next-day delivery.
Jointer Competency Training can be booked via Thorne & Derrick and obtained from the Nexans Training Centre | Normanton | West Yorkshire WF6 1TR
The kits include clear step-by-step Jointing Instructions – Competency Certification can be issued, contact us.
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.
Nexans MONOi heat shrink cable terminations are a one-piece co-extruded anti-track (red) and stress control tube for connection and terminating 11kV BS7870-4-10 Triplex Cables 95-300sqmm into medium voltage electrical equipment.
âž¡ TERMINATIONS TRIPLEXÂ Download Specification
âž¡ TERMINATIONS TRIPLEX Jointing Instruction
âž¡ JOINTS TRIPLEX Download Specification
âž¡ JOINTS TRIPLEXÂ Jointing Instruction
Disclaimer: This document – Jointing Instruction – is a sample instruction to be used for reference only and is for a specific cable, the relevant instruction will change as per the cable specification it is to be used on.
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
Images:Â Mikolaj Kukawski | Customer Networks Manager at ESM Power Ltd
MV HV Switchgear | Thorne & Derrick distribute Nexans Euromold, 3M Electrical, PFISTERER Connex, Prysmian and Shrink Polymer Systems ranges of Joints, Terminations & Connectors to enable the installation and maintenance of electrical switchgear, transformers and substations.
T&D supply Cables, Accessories & Electrical Products for Low Voltage (LV 230V to 1000V), Medium Voltage (MV 3.3kV/11kV to 33kV) and High Voltage (HV 33kV to 132kV) networks.
Subscribe now to our POWER NEWSLETTER– a monthly email circulation packed with news, projects, videos, technical tips, training information, promotions, webinars, career opportunities and white papers.
Includes access to our popular JOINTERS BLOG with contributions from utility professionals, linesmen and cable jointers working on MV HV EHV cables and overhead lines typically at 11kV, 33kV, 66kV and up to 132kV.
15,000+ Subscribers. ➡Â
Joints | Terminations | Connectors | Cables & Accessories LV MV HV
Published 22 May 2026
The following article on Cable Asset Management has been published with the kind permission of ERPA. ERPA (Electric Power Reliability Alliance) are a collaborative practitioner community that works to advance awareness and understanding of electric power reliability. ERPA are...
Published 22 May 2026
Restoring transformer termination integrity with LoviSil A Modern Solution for Ageing PILC Networks UK DNO Approved For 25 Years+ When a major site recently experienced a fault on an 11kV transformer termination, the challenge was clear: restore the system...
