uploaded by Chris Dodds | Thorne & Derrick Sales Marketing Manager
High Voltage Energy Transmission Flowing – 110kV, 132kV & 220kV
The construction of new power plants and the growing demand for renewable energy sources has increased the need to expand and/or convert networks into transformer substations or onto overhead line towers.
Flexible high voltage cable leads are used by electrical utilities and contractors for emergency preparedness and use on substations and OHL (Overhead Lines).
As a key player in the energy industry, Nexans is pleased to offer a safe and flexible component for such projects : pre-terminated temporary site cables.
These high voltage cable leads are supplied pre-terminated and can be used to temporarily connect MV HV equipment in a high voltage network, e.g. as a bypass during construction or cable repair and servicing work, or during emergencies such as natural disasters or severe weather.
When faults occur in overhead or underground lines, temporary site cables make it possible to restore energy transmission rapidly. While modification work is underway in a transformer station, temporary connections can be rapidly installed between transformers and switchgear systems or overhead lines.
Temporary site cables are available from stock or can be manufactured to meet your specific requirements.
Flexible silicone rubber outdoor cable terminations facilitate use in any position and due to their low weight, the Nexans cable terminations can be operated without additional support.
Temporary leads have the same design as high voltage cables but with reduced insulation thickness, this facilitates a small bending radius making them easy to handle and install.
Nexans manufactures temporary cables in a variety of lengths across three voltage ranges: 110kV, 132kV and 220kV.
Pre-terminated temporary site cables
Pre-Installed Flexible Silicone Rubber Terminations for Simplified Installations
Due to the conditions under which temporary site cables are installed, the cable accessories must be to easy to use and have a wide range of possible applications.
Nexans’ pre-installed flexible silicone rubber terminations facilitate use in any position.
Due to their low weight, the cable terminations can operate without any additional support structures. The monobloc design ensures the terminations are suitable for voltages from 72.5kV to 220kV offering maximum flexibility and operational reliability.
Nexans HV Cable Leads 132kV
Nexans High Voltage Cable Leads
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
uploaded by Chris Dodds | Thorne & Derrick Sales Marketing Manager
Ellis Patents Guide The Way With Guide Clamp Cable Cleats
Ellis Patents, the world leading UK designer and manufacturer of cable cleats have developed the Cable Guide Clamp – a combination of a cable guide and a cable clamp for high voltage (HV) cables.
The Ellis Cable Guide Clamp is designed to be installed in place of rollers along the HV cable route where the cable length is pushed and pulled through to its final destination.
Ellis Patent Guide Clamp was developed to provide a product that could be used during cable installation and then be used to clamp and restrain the HV power cable.
The Ellis Cable Guide Clamp works in two simple stages. Firstly during cable pulling, the guide clamps gimballed mounting and slipper nylon construction enables simple installation and cable guiding.
Once the cable has been sufficiently pulled through and placed, the top half of the guide clamp is removed and a LSF polymeric fixing piece installed directly onto the cable.
Then, the top half of the guide clamp is replaced turning it into a fully functioning HV cable clamp. The narrow Ellis Patents design minimises the cable to cable distance resulting in greater flexibility, easier movement and therefore simpler installation.
| Cable Guide Clamp Part Number | ∅ Range (mm) |
| CGC100-112-G | 100 – 112 |
| CGC110-122-G | 110 – 122 |
| CGC120-135-G | 120 – 135 |
| CGC130-145-G | 130 – 145 |
| CGC140-160-G | 140 – 160 |
| CGC150-170-G | 150 – 170 |
Ellis Patents HV Cable Guide & Clamp – Product Dimensions
The Ellis Cable Guide Clamp was originally designed for use on an offshore project by Siemens and has now been developed for use with HV cables in many other potential applications.
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:
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
uploaded by Chris Dodds | Thorne & Derrick Sales Marketing Manager
ProGARM delivers ultimate arc flash clothing and protection, including arc gloves, conforming with the relevant industry and EN standards ensuring protection from arc flash incidents for workers carrying out installation or maintenance of LV Low Voltage, MV Medium Voltage or HV High Voltage power systems.
Arc Flash Protection
ProGARM is the leading UK manufacturer of high-quality, Flame Resistant, Arc Flash clothing, gloves, garments and workwear – they work successfully with their UK Distributor Thorne & Derrick to save lives and reduce arc flash accident effects.
ProGARM is the only UK manufacturer concentrating on and specialising 100% in Arc Flash and Flame Resistant garments for utility workers and businesses.
Arc Gloves
The dangers of Arc Flash incidents and the importance of protection from these hazards has never been as significant as it is today. This prominence will continue to increase over the next few years.
With multiple cable strikes every day in the UK and numerous major Arc Flash incidents, businesses are looking at how best to protect their team with the right Flame Resistant garments and accessories, including arc rated gloves. The correct clothing can significantly reduce injury and save lives.
ProGARM and Thorne & Derrick are committed to continual research and improvement to innovate and develop their range of arc flash clothing as quickly as possible to bring you the best Arc Flash protection for your team – this includes hand protection against flash incidents using arc rated gloves.
ProGARM are committed to continual research and improvement to innovate as quickly as possible to bring you the new products and Arc Flash clothing and protection you require.
The latest innovation is the 2700 Arc Flash dexterity glove, designed and developed to provide a comfortable and practical glove solution for those undertaking complex work with their hands when handling underground cables and overhead lines depending of the level of arc flash protection required.
The latest development within the accessories range, these arc rated gloves combines exceptional Arc Flash protection with practical features, including abrasion resistance, elasticity and improved hand conformity with excellent wet and dry grip.
And as you would expect from ProGARM, the 2700 Arc Flash rated gloves have been designed with the user at mind. Featuring A4/Cut 5/Level D resistance alongside its inherent Arc Flash protection, they can take the place of the standard grip and grab gloves used within a variety of industry sectors. This will not only keep the practicality that operatives are used to but also combat the risks of wearing highly flammable gloves when at risk of an Arc Flash incident.
With a calorific rating of 8.6 cal/cm², our 2700 Gloves are excellent Arc Flash resistant gloves. Having been tested to Arc category 2 using the Open Arc Test Method and conforming to NFPA 70e, mechanical risks, EN 388:2016 and thermal risks, EN 407:2004 you don’t have to compromise the hand safety and protection of the wearer.
Alongside its practical design and features, the 2700 arc glove is sure to be a complementing and necessary accessory to add to you and your team’s Arc Flash PPE solution.
An electric arc occurs whenever a circuit breaker, switch or isolator (Device) is opened and when there is current flowing in the circuit. However, most devices under normal operating conditions are designed to control the arc when opening or closing.
An arc flash may occur when the arc is uncontrolled and there is sufficient energy released to cause harm or damage.
Arc flashes occur both at high voltage and low voltage. There is little discrimination: low voltage arc flashes injuries are just as damaging at high voltage injuries.
Put simply: An arc flash is the light and heat produced from an electrical arc supplied with sufficient energy to cause significant damage, fire or injury.
An arc flash can cause minor injuries, third-degree burns and potential death as well as other injuries including blindness, hearing loss, nerve damage and cardiac arrest. Fatal burns can occur when the victim is several feet from the arc. Serious burns are common at a distance of 10 feet – arc flash can generate heat 4 times greater than the surface of the sun.
The dangers of an Arc Flash
Thorne and Derrick are proud to be distributors of ProGARM arc flash coveralls and protection.
We can help – should you require arc flash calculators or advice on the type of clothing and protection available please do not hesitate to contact us.
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:
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
Thank you to the Electrical Safety Authority for allowing us to republish this article.
Mississauga, on (September 20, 2019) – In the last day, three confirmed electrical-related incidents that have involved four individuals have been reported on worksites across Ontario: two reported fatalities and two critical injuries. All of these incidents involved contact with overhead electrical wires.
The Electrical Safety Authority is supporting the Ministry of Labour while each of these incidents are investigated. “In the last 24 hours, four families have been tragically impacted by the dangers of electricity and we are incredibly saddened by this news,” says Dr Joel Moody, Chief Public Safety Officer with the Electrical Safety Authority. “Unfortunately, these incidents were preventable and it’s clear that more needs to be done to help Ontarians stay safe when working around electricity.”
In the last 10 years, 19 Ontarians have died after making contact with energised powerlines.
The events of the past 24 hours further reinforce the serious nature of electricity and need to always be vigilant when working close to or around energised wires.
To keep safe, ESA urges everyone to remember these safety tips when working around electricity – at home or on the job:
The Electrical Safety Authority’s (ESA’s) role is to enhance public electrical safety in Ontario.
As an administrative authority acting on behalf of the Government of Ontario, ESA is responsible for administering specific regulations related to the Ontario Electrical Safety Code, the licensing of Electrical Contractors and Master Electricians, electricity distribution system safety, and electrical product safety.
ESA works extensively with stakeholders throughout the province on education, training and promotion to foster electrical safety across the province. More information on the Electrical Safety Authority can be found at esasafe.com and on Facebook at www.facebook.com/ElectricalSafetyAuthority.
ESA’s Customer Service Centre can be reached at 1-877-ESA-SAFE (372-7233).
For further information: Electrical Safety Authority Media Relations 905-712-7819 or [email protected]
Thorne and Derrick are proud to be distributors of ProGARM arc flash coveralls and protection.
We can help – should you require arc flash calculators or advice on the type of clothing and protection available please do not hesitate to contact us.
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:
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
uploaded by Chris Dodds | Thorne & Derrick Sales Marketing Manager
Thorne & Derrick, UK Specialist Distributors of LV MV HV Jointing, Earthing, Substation & Electrical Eqpt, are delighted to be able to provide the following excellent Guest Blog and commentary geared towards reducing cable failure rates caused by poor workmanship and sub-standard MV cable preparation.
Critically, the article focuses on the importance of precise and careful treatment of the semiconductor screen on medium voltage power cables by the jointer or cable splicer. This insulation screen, is the semi-conductive layer of the medium/high voltage cable and provides a homogeneous even distribution of the electric field between the external insulation and metallic screen on the MV cable.
Typically, the insulation screen can be fully bonded or easy-strippable. The removal of the insulation screen is the most critical step during the cable preparation process and the the use of the correct jointing tools by a Competent Jointer can extend the service life of power cable systems and underground distribution networks.
Incorrect or sub-standard cable preparation is the primary cause for the failure of medium/high (MV-HV) cable accessories including joints, terminations and connectors.
By: Ben Lanz – Director, Applications Engineering at IMCORP
Witness the excellent square radial cut to the semicon layer of the power cable (arrow) in the photograph below.
Square Semicon Screen Cut On Medium Voltage Cables
IMCORP, providers of diagnostic services for medium and high voltage power cable systems, have just finished an Accessory Performance Consultation for a critical generation facility.
Expert cable condition analysis and power cable life cycle consulting services provided by IMCORP can prevent any systemic semicon cutback issues when a Factory Grade(R) site commissioning assessment is provided. This can prevent multiple costly cable system failures on medium voltage power systems.
Unfortunately, there was some ‘pick off ‘ (circle) that required some light localised sanding by the cable splicer.
This is how IMCORP remove cable failure producing defects and eliminate future O&M through Factory Grade(R) Certification and quality control assessment enabling a predicted 100 year life cycle of the cables.
In the UK it is normal to smooth-out the step down on the screen cut from the primary XLPE insulation using a rat tail file or aluminium oxide abrasive paper for sanding.
However international standards and jointer preferences vary on the subject.
Ben comments, “this semicon cut back was made for an IEEE 386 35kV separable connector which has a built in square step in the stress cone cable adapter that ideally needs to interface with a square semicon step made with a semi con scoring tool on a ICEA type strippable insulation shield. If the cable jointer bevels the edge it would require significantly more void filling grease which can be a risk factor for substandard performance in this type of medium voltage cable installation. We have a factory comparable partial discharge test for the field that we have used to test tens of thousands of these types of separable connector terminations. I can assure you that this technique in conjunction with installing the rest of the cable termination correctly will far surpasses the manufacturer’s PD performance expectations.”
Removal of Semiconductor “Pick Off” On Medium Voltage Cables
Regarding the removal of the semicon ‘pick off’ contaminant from the MV cable which is circled in the picture, Ben recommended the following.
“At 35kV we recommend using a little 120 grit aluminium oxide sandpaper, but only at the location of the contaminant with a small circular motion at the tip of the thumb.”
“We never recommend sanding at this voltage class with a strippable insulation shield unless the cable cleaner will not remove the contamination,” adds Ben.
Here, the semi conductive layer has been left on the 11kV XLPE insulation which can cause surface tracking and eventual flash over.
The below cable preparation images clearly shows the straight and clean cut to the black semicon screen stepping down onto the 11kV cable insulation (XLPE) – here a constant force spring provides a straight edge for copper tape screen on the 11kV cable before installing the cable termination.
Image: David Baldock (HV Cable Jointer) – the insulation screen transition is perfectly smooth and clean achieved by a straight final cut.
FAILURE – cable failures are disruptive and dangerous, but also avoidable.
Not all, but some.
Whatever your currency the financial cost of cable failure is overshadowed by the immeasurable cost inflicted in terms of loss of reputation.
Tony Haggis (Director at Tony Haggis Consulting Ltd) with 46 years experience in electricity distribution up to 132kV provided some professional insight.
“It looks like a very carefully executed screen cut and a nice neat job. However, one problem that occurs with this method is that the screen can lift slightly off the insulation when the upper part or the medium voltage cable screen is torn off at the depth cut. This results in a small void under the screen which can result in partial discharge.”
“In EoN Central Networks, we identified this as a root cause of MV cable failures after microscopic inspection. We changed the semicon screen cut method to using a small round file to make a circumferential groove at the screen off position which just exposed the white insulation below.”
Tony continues, “when the cable screen was pulled off there then was no danger of lifting the remaining screen. The result was a tapered transition on the screen. This eliminated failures due to discharge at the screen off position. Eventually, we moved to bonded screen and top quality bonded screen stripping tools which again provide a reliable screen off cut but more easily and quickly. Bonded screen was also lower cost than strippable.”
Delamination & PD
Ben replied on the issue of MV cable failures, “we taught the class how to remove the semicon while minimising the likelihood of delamination and the how to inspect for this issue. Fortunately, we will not have to guess if they followed our recommendations. The owner requires a third party factory comparable PD test (offline 50/60Hz PD test with better than 5pC sensitivity) on 100% of the installations and the installer is on the hook for repairs and retests. This is becoming the new standard for QA/QC!”
The new Alroc CWB/18-60-MVS cable jointers tool, with “stop” included, removes both the bonded semi-conducting screen without requiring lubrication while also creating a chamfer in a clean and reliable cable preparation process.
Here the cable jointer demonstrates the ease of simplicity of removing bonded semiconductor screen layer from 11kV Triplex cables with 300sqmm stranded copper conductor and XLPE insulation prior to terminating into medium voltage switchgear. The Ripley US02 is set at 1mm during this cable preparation process.
21st century power networks depend upon type-tested, trustable medium voltage cable accessories such as cable joints and cable terminations, to energise our lives.
Cable accessories are only reliable if installed in accordance with the manufacturers jointing instructions and recommended cable stripping dimensions.
Precision engineered cable jointing tools are an essential part of the MV-HV jointers toolbox ensuring the accurate removal of cable sheaths, insulation and semicon screens on MV-HV cables.
Ben goes on to explain, “I agree that the semicon cutback is the most critical part of the cable termination and I agree that a smooth transition (chamfer or slope) is better than a step if the termination design has a smooth interface. However, this cut back was made for an IEEE 386 35kV separable connector as referenced above.”
However, jointers tools alone without the knowledge, expertise and skill of a Competent Jointer to use them are not worth diddly squat.
For instance the photograph below highlights the problem of unskilled labour, even if equipped with the correct cable jointing tools, inflicting catastrophic damage to MV-HV power systems through lack of training, experience and understanding of the criticality of semicon cutback.
Non-radial, rough and jagged semicon screens with protuding points at the cutback will cause cable termination or joint failure. Outage. Blackout.
Ben’s Bio
Ben Lanz
Ben Lanz is Director of Applications Engineering at IMCORP USA and has expert technical oversight of power cable life cycle consulting (5kV-500kV).
Ben has published several technical papers on power system reliability, asset management, diagnostics and regularly presents on the topics. He is a Senior Member of the IEEE Power & Energy Society, a voting member of the IEEE Standards Society, and a member of the IEEE Dielectrics and Industrial Applications Societies. He has served as Chairman of the Insulated Conductors Committee (ICC) technical committees responsible for cable testing, cable reliability and surge arresters.
Who Are IMCORP?
IMCORP is the leading provider of power cable reliability assessment services for medium and high voltage (5kV to 500kV) power cable systems for both aged and new cable installations. Our Factory Grade® assessment is non-destructive, requires no hazardous materials, and is a cost-effective alternative to cable replacement. We identify the precise cable system Rehabilitation requirements, allowing the customer to Certify their cable systems to like-new condition.
MV HV Power Cable System Reliability Solutions by IMCORP
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 voltage power systems:
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
MV HV High Voltage Cable Joints | Cable Terminations | Cable Connectors | Distributed from Stock | UK & Export Sales
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