Images Coutesy of: Timo van der Harst – Eigenaar VDH Kabelmontage Laag- en Middenspanning, Vlaardingen, South Holland, Netherlands
Pictured: Kabeldon SMTXB Cable Joint
Jointers blog
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 BLOGwith 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.
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3M Scotch Super 33+ Vinyl Electrical Tape
3M Electrical Tapes
Scotch Super 33+ Tapes
When it comes to the your most demanding electrical maintenance and repair jobs where failure and equipment downtime are simply not an option look no further than the 3M Scotch Super 33+ Vinyl Electrical Tape.
The vinyl electrical tape has excellent resistance to abrasion, moisture, alkalies, acids, corrosion and varying weather conditions (including UV exposure) and forms part of the 3M Scotch Electrical Tapes. Scotch Super 33+ can be used in hot or cold temperatures, high humidity or in contact with contaminants and aggressive substances making the tape suitable for inside and outdoor environments.
Highly conformable and super-stretchy and designed to perform continuously in ambient temperatures up to 105 °C
Scotch® Super 33+™ Vinyl Electrical Tape is designed for:
Primary electrical insulation of electrical connections up to 600V
Scotch Vinyl Colour Coding Electrical Tape 35 is the professional grade vinyl electrical tape available in nine fade resistant colours: blue, brown, grey, green, orange, red, violet, white, yellow, and pink. Outstanding electrical and mechanical properties make this tape excellent for use in phase identification, colour coding
of motor leads and piping systems, and for marking safety areas. Scotch® Tape 35 applies smoothly and conforms well down to 0 °C. Maximum operation temperature is 105 °C.
Scotch® Rubber Splicing Tape 23 is made
from Ethylene Propylene Rubber. This
product fuses to itself in a short time after application to create a solid piece of rubber with high dielectric properties and is impenetrable by moisture. It’s a great option when working on jobs with voltage up to 69 kV. Split resistant, crack resistant and flag resistant within harsh environments. Rated for 90 °C continuous operating temperature and over- load temperatures of up to 130 °C. Scotch® Rubber Splicing Tape 23 features a liner, making it easy to cut and apply the tape in strips and in messy environments.
This product combines the advantages
of rubber and mastic tapes for fast application. Scotch® Rubber Mastic 2228 is a conformable self-fusing rubber electrical tape designed for electrical insulating and moisture sealing applications at 90 °C with an emergency overload rating of 130 °C. It is flexible and conformable over irregular shapes. The thick construction allows quick application build-up and padding, good for cable jacket repair. It is UV resist- ant and has excellent adhesion and sealing characteristics with copper, aluminium and power cable jacket material.
3MTM Scotchfil Electrical Insulation Putty is a noncorrosive electrical grade compound in a tape form, easy to mould by hand down to 0 °C. It’s a great solution for smoothing uneven surfaces and eliminating voids until good overall padding is provided. 3MTM Scotchfil Putty is recognized as a splice insulation for electrical conductors at temperatures up to 80 °C when overwrapped with Scotch® Super 33+TM.
3M Scotch Electrical tapes are used to cable joint, splice, repair, seal and protect cables against abrasion, fire and corrosion – this includes LV-HV (11kV-33kV cables) – please contact T&D should you require assistance with selecting the correct tape.
Image: Dean Wilson – Owner Director at D.C. Jointing Ltd
D.C. Jointing Ltd are Specialist Electrical Cable Jointers with a team of 15 skilled staff in all aspects of offshore and onshore cable jointing up to 132kV, including cable jointing LV, HV and EHV, major projects with Regional Electricity Companies, onshore wind farms, offshore windfarms, power stations and National Grid.
The development of high voltage XLPE Cable Systems goes back to the 1960’s. Since then production and material technology have significantly improved, to provide reliable and maintenance-free products to the utility industry.
At present, numerous high voltage XLPE cable systems with nominal voltages up to 500 kV and with circuit lengths up to 40 km are in operation worldwide.
Cable systems are equipped with accessories, which have passed the relevant type tests pursuant to national and international standards, such as long-duration tests. As one of the first XLPE cable manufacturers worldwide Brugg Cables passed a Prequalification Test on a 400 kV XLPE Cable System according to the relevant international standard IEC 62067 (2001).
This test required one year of operation, along with the thermal monitoring of all cables, joints and terminations installed. It was successfully completed at CESI Laboratory in Milan, Italy in 2004.
As one of just a few providers worldwide, Brugg Cables can offer a broad range of both XLPE cables (up to 500 kV) and oil-filled cables (up to 400 kV) as well as their accessories.
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 BLOGwith 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. ➡
A Benchmark Brief
from Burns & McDonnell
by PETER KUFFEL
Peter is a project manager at Burns & McDonnell with 30 years of experience in HVDC and flexible AC transmission systems and specializes in HVDC system studies, HVDC control and protection, reactive power compensation, power system expansion/interconnection studies and simulation, and power system computer-aided design (PSCAD) model development and studies.
Burns & McDonnell are a family of companies with an unmatched team of 7,600 engineers, construction professionals, architects, technologists and scientists. Their singular mission since 1898 has been to make clients successful – ‘When we plan, design, permit, construct and manage projects worldwide, we do it like we own it.’
Burns & McDonnell is a 100% employee-owned company who tackle every technical challenge, every complex detail, with the intent and attention of an owner. It’s what brings clients back, project after project.
Benefits of HVDC Transmission
As the demand for power is increasing, government policies are providing incentives to utilities for adopting renewable energy sources. Utilities are investing time and money to improve the transmission of renewables from offshore wind and solar.
Today, most power grids use high-voltage alternating current (HVAC) for transporting energy over long distances, but that technology is susceptible to losses during transmission, has limits on power transfer over long distances, and has limited power control capability. A high-voltage direct current (HVDC) system converts the power from alternating current (AC) to direct current (DC) at the sending end, transmits the power using DC, converts the power back from DC to AC at the receiving end, and delivers the power to the receiving end AC grid.
Application of HVDC technology is expanding not only for large bulk power transfer over long distances, but also in the interconnection of renewable energy sources.
Bulk Power Transmission Efficiencies
Transmission cost depends on numerous factors, such as the size and quantity of conductors, equipment needed at the terminal stations, and transmission tower size.
HVDC is particularly well suited for bulk power transmission over long distances for several reasons:
A bipolar HVDC system consisting of two high-voltage conductors on one tower offers reliability comparable to a double-circuit HVAC line, significantly reducing the transmission line costs and right-of-way requirements.
Losses in a transmission line depend on the resistance of the line. One factor that impacts the resistance is skin effect, which causes the effective resistance to increase with increasing AC frequency. Use of DC eliminates the skin effect, reducing overall transmission losses.
HVDC transmission systems require converter stations at each end of the line to convert the AC to DC and back. Cost of HVDC converter stations can be substantially more than a conventional AC substation with similar power throughput. That expense may be counterbalanced by reduced transmission line costs and reduced losses. This becomes more evident as the distance and/or power transfer level increases.
Cable Length Advantage
HVAC transmission cable length is limited because as the length of cable increases, the capacitive charging current increases. It can reach a point that the capacitive charging current approaches the total current carrying capacity of the cable. HVDC has no capacitive charging current, and higher levels of power can be delivered over longer distances. HVDC cable length is theoretically only limited by capital cost. Enabled applications include:
Connection of offshore wind farms: As development of offshore wind generation assets increases, the location of wind turbines generators is moving farther from the shore. The increasing distances between the generators and the onshore point of interconnection means the necessary cable length is increasing. HVDC can be a viable transmission option, unlocking the true potential of renewable energy.
Transmission into congested areas: Increasing demand, particularly in congested areas, coupled with challenges of accessing rights-of-way has driven the need to maximize power transfer and a push to go underground. HVDC is an excellent option for high-power cable transmission installations, maximizing the amount of power transfer per cable.
Power Controllability
Within an HVAC system, the ability to control power flows in any given parallel path is limited. Power flows are dictated by the relative impedance of various parallel paths from a given source of generation to a given load. HVDC, on the other hand, offers very fast and accurate control of the power flowing within its system. The operator can select the amount of power to be transmitted over the link. If that power is available at the sending end, it is then converted to DC, transmitted to the receiving end, converted back to AC and injected into the receiving AC system. Auxiliary control functions can further enhance AC system’s stability by providing frequency control and damping of power swings within the AC grid.
HVDC systems offer higher transmission capability and lower transmission losses over long distances than AC and provide better ability to control power flows. Additionally, they provide the ability to transmit more power over longer lengths of cables, making them an attractive alternative for the transition to renewable energy sources.
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.
Technical Library & Resources | Education & Learning with SEB International
Thorne & Derrick provide competitive prices and fast delivery as the main UK distributor of SEB Cable Pulling & Laying Products including handling and installation equipment for power (land and subsea), umbilicals, fibre and telecoms cables. SEB products are typically used to install transmission, distribution and medium/high voltage substation power cables into ducts or trenches, LV up to 400kV.
Thorne & Derrick International distribute the most extensive range of Cable Pulling & Laying Equipmentto enable the installation of LV, MV HV Cables into underground trench or duct – products are also stocked for fibre optic blowing, OHL stringing, subsea trenching, offshore umbilical installations and pulling armoured cables onto cable tray.
Cable Pulling & Laying
TOP 20 BLOGS
See our collection of the Top 20 Cable Laying Blogs featuring SEB International, and their range of LV, MV & HV Cable Pulling and Cable Laying products:
THORNE & DERRICK are Specialist Distributors of LV HV Cable Jointing, Earthing, Substation & Electrical Eqpt up to 66kV– this includes the most extensive range of Ex Stock Innovation Tooling to facilitate safe and reliable preparation, termination and installation of cables.
Cable Innovation Tools & Accessories for Low & High Voltage Power Systems
MV HV High Voltage Cable Joints | Cable Terminations | Cable Connectors | Distributed from Stock | UK & Export Sales
INDUSTRIAL LABEL PRINTING SOLUTIONS When clear, durable and professional identification is required across control panels, cable systems, production facilities and industrial installations, print quality, reliability and ease of use are critical. Cembre industrial label printers are designed to support...
HIGH VOLTAGE JUNCTION BOXES & ENCLOSURES When high-voltage power distribution and cable termination are required, safety, enclosure integrity and long-term reliability are critical. HV Junction Boxes and Electrical Enclosures manufactured by Abtech are engineered for the safe distribution, cable termination and protection...