Founder at Aldora Electric | Expert in Renewable Electrical Engineering & Cable Systems | Problem Solver | FIEAust CPEng NER
HV Bushings & Connectors
What Are Interface F Bushings?
How Do To Select the Right Cable Connector?
As medium voltage (MV) power systems grow in scale and capacity, manufacturers have introduced electrical equipment, such as transformers and switchgear, capable of handling up to 1250A at 52kV and 2500A at 36kV.
To ensure interoperability across manufacturers, these Interfaces are standardised under EN 50180 and EN 50181 as Interface F Bushings.
Furthermore, EN 50673 standardises 630A and 1250A bushings at 72.5kV.
What Are Interface F Bushings Used For?
Interface F bushings are typically used to connect gas-insulated switchgear (GIS) and transformers to cable circuits using separable connectors distributing electrical power at 11kV, 33kV and up to 66kV – manufactured by Nexans Euromold the connectors are suitable for cable termination of polymeric (XLPE EPR) insulated cables with copper wire or copper tape screen, wire armoured (SWA/AWA), wire braided or unarmoured cables into MV-HV Electrical Equipmentwith Interface F bushings.
Advantages of Electrical Equipment Bushings
Compact switchgear and transformer designs
Interoperability across different manufacturers
Types of Interface F Bushings
As defined in EN 50180 and EN 50181:
F1 Bushings: Um ≤ 36 kV; Ir = 2500 A F2 Bushings:Um ≤ 52 kV; Ir = 630 A F3 Bushings:Um ≤ 52 kV; Ir = 1250 A
For 72.5kV high voltage power systems, EN 50673 defines the following: F4 Bushings: Um = 72.5 kV; Ir = 630 A F5 Bushings:Um = 72.5 kV; Ir = 1250 A
Note: F5 interfaces are commonly used in offshore wind applications but can adopted for large onshore installations as well.
How to Select the Right High Voltage Separable Connector for Interface F Bushings
To ensure proper fit and reliable performance the following information must be established:
Interface type? e.g. F1
Maximum system voltage? e.g. Um = 36kV
Cable insulation type? e.g. XLPE
Conductor material and cross-section? e.g. copper, 800sqmm
Insulation over-diameter? e.g. 52.8mm
Number of circuits per phase? e.g. 2 circuits
Are surge arresters required? Confirm via an insulation coordination study
Interface F bushings enable safe, standardised, and high-capacity MV cable connections to GIS, and transformers, both for on-shore and off-shore applications.
Selecting the correct separable connector Interface F Connector —matched to interface type, voltage, current, cable type, and system design—ensures long-term reliability, safety, and maintainability.
Definitions of International Electrical Standards
EN 50180 |This European Standard is applicable to ceramic and resin insulated bushings having highest voltages above 1kV up to 52kV, rated currents from 250A up to 3150 A and frequencies from 15 Hz up to 60 Hz for insulating liquid filled transformers. This European Standard establishes essential dimensions, to ensure interchangeability of bushings and to ensure adequate mounting and interchangeability of mating plug-in separable connectors of equivalent ratings.
EN 50181 |This European Standard is applicable to insulated bushings for maximum voltages above 1kV up to 52kV, rated currents from 250A up to 2 500A and frequencies from 15 Hz up to 60 Hz for equipment other than liquid filled transformers. This European Standard establishes essential dimensions, to ensure adequate mounting and interchangeability of mating plug-in separable connectors of equivalent ratings.
EN 50673 |Extend the scope of the EN50180-1/2/3 and EN50181 for plug-in type bushings up to 72.5 kV
Thorne & Derrick distribute the most extensive range ofMV HV Medium & High Voltage Cable Joints, Terminations & Connectorsfrom manufacturers including 3M, Prysmian, Nexans Euromold, Elastimold, Pfisterer CONNEX & SEANEX and Shrink Polymer Systems.
Network resilience requires advanced technology solutions manufactured from highest performance materials; if high harmonics, Sine wave distortion, AD8 protection, abnormal thermal cycling, high-water table, ALE of legacy PILC or general cable failure prevention to critical 11/33kV circuits matters to you, then talk to us.
UK DNO Compliance (G81) & Contestable Connections (including NGED)
High Water Table, Submersible, Seawater Resistant & Flood Zone Installations
Mechanical Protection for Heavy Industrial Applications
Asset Life Extension of Legacy Paper-Insulated Cables (PILC / PICAS)
High Harmonics & Non-Linear Loads (Sags & Swells)
Sine-Wave Distortion & Power Quality Improvement
Abnormal Thermal Cycling in “High-Load / Low-Load” Systems
Flame-Free Installation for Potentially Explosive Atmospheres
Where cables undergo dynamic cyclical load in high harmonic and non-linear load applications the Lovink range of cable joints demonstrate years of fault-free field performance in high temperature installations – additionally, the cable joints are “flame-free” and therefore safe for installation in potentially explosive atmospheres as no heating source or naked flame is required for the installation.
Resin encapsulation provides the highest levels of mechanical impact protection and electrical insulation eliminating voids, discharges and ionisation within the cable joint – the seawater resistant resin and “wet area” (2 bar at 20m water head) performance counters premature electrical cable joint failures in the renewable sector where damp soil conditions, flooded duct and water immersion can induce premature service failure to jointing solutions utilising other technologies.
The compact design permits reduced size joint holes reducing excavation and associated civil engineering preparation costs – ideal for confined space applications where volume displacement is a factor and close quarter working necessitates a compact profile solution.
Thank you to Stephen Davies (Lovink Enertech Account Manager) for todays emphatic Presentation and roundtable with our incredible Team.
High Water Table Cable Connections
up to 2Bar (20m) Water Table
Lovink Cable Joints
Water ingress is one of the most common causes of failure in underground cable networks.
Once moisture reaches a cable joint in waterlogged soils, flooded areas or cable pits, the risk of failure increases significantly.
So how do you ensure a connection remains properly sealed in waterlogged conditions?
The LoviX® R70 Straight Jointuses a cold shrink design combined with a fully sealed resin system, enabling a consistent and pressure-resistant seal, with testing up to 2 bar water pressure.
For straight, transition and branch connections of MV Power Cables – this includes 11kV and 33kV paper-insulated (PILC/PICAS) and polymeric (XLPE/EPR) cables up to 1000sqmm.
The Lovisilrange of water proof cable joints provide excellent continued service for Medium & High Voltage Cables in flooded cable trenches, underground cable ducts and general wet-conditions associated with high-water table applications with a Type-Test documented to 2 Bar water pressure; typically used to fault repair, divert and extend single and 3-core cables with XLPE, EPR and PILC insulation with 11kV 24kV 33kV voltage classification.
Cable Joints for Medium & High Voltage Cables | the Lovink range of cable joints provide high-performance for high-challenge applications including configurations for straight, transition, branch and loop jointing of cables typically distributing electricity at 11kV, 24kV and 33kV; this includes connection joints for extensions and repairs for MV HV cables with XLPE, PILC & EPR insulation.
The Lovisil range of water proof cable joints provide excellent continued service for Medium & High Voltage Cables in flooded cable trenches, underground cable ducts and general wet-conditions associated with high-water table applications with a Type-Test documented to 2 Bar water pressure; typically used to fault repair, divert and extend single and 3-core cables with XLPE, EPR and PILC insulation with 11kV 24kV 33kV voltage classification.
Thorne & Derrick | Preferred UK Stockists & Distributors for Klauke
Battery-Powered Hydraulic Bolt Cutters
Klauke’s battery-powered hydraulic bolt cutters are indeed a game-changer for precision, speed, and safety.
The innovative Bolt Cutting Tooldesigns and powerful features of these Klauke models make them ideal for cutting cable trays, bolts, and steel wire with maximum efficiency and minimal effort.
The Klauke range of models provides specialised solutions for different tasks, ensuring that professionals can find the perfect tool for their needs.
Whether you’re working with smaller or larger cables and bolts, Klauke’s tools provide the precision and power necessary to get the job done right.
Let’s dive into the specifics of each of the Klauke tool models mentioned:
Klauke EBS 6 L GKS
The EBS 6 L GKSis a compact and versatile model designed for cutting smaller cables and bolts with high precision. It is particularly ideal for tight spaces and allows for easy handling without compromising on cutting power. The ergonomic design ensures comfort during prolonged use, and the quick, clean cuts are a testament to its efficiency.
Klauke EBS 8 ML
The EBS 8 ML offers enhanced cutting capabilities, making it perfect for medium-sized cables and bolts. Its battery-powered hydraulic system provides smooth operation with minimal force, while the robust construction ensures durability. This model is known for its balanced performance and excellent cutting power, which makes it suitable for a variety of tasks.
Klauke EBS 12 ML
With an even greater cutting capacity, the EBS 12 ML excels in cutting larger cables and bolts. Its high-performance battery ensures consistent power throughout its operation, and the hydraulic mechanism delivers clean, precise cuts every time. This model is designed for heavy-duty use while still maintaining ease of handling and mobility.
Klauke EBS 8
The EBS 8 model offers an excellent balance between performance and size, making it suitable for a wide range of cutting tasks. Whether you’re working with medium-sized bolts, cables, or trays, this model combines strength, speed, and user-friendly features, ensuring high productivity and safety on the job site.
Klauke EBS 12
The EBS 12 is a powerhouse, designed to handle the toughest cutting challenges. Its powerful battery and hydraulic cutting system can tackle the most demanding tasks, ensuring that larger steel wires, bolts, and trays are cut effortlessly. It is engineered for high-volume work, offering both efficiency and reliability in the toughest conditions.
Key Klauke Tool Advantages
Efficiency: Each cutting and crimping tool model offers optimal cutting speed, minimising downtime and improving productivity on the job
Ease of Use: The ergonomic designs, lightweight construction, and user-friendly controls allow for comfortable use, even in difficult working conditions
Safety: These tools are designed with safety in mind, ensuring that the user can operate them with confidence and without risk of injury
Durability: Built to withstand demanding environments, these models feature high-quality materials that ensure long-lasting performance
Battery-Powered: The battery-operated hydraulic system eliminates the need for cumbersome cords, providing freedom and flexibility to work in any location
Klauke Bolt Cutters
These 3 Klauke bolt cutters – EBS 6 L GKS, EBS 8 & EBS 12 – effortlessly cut a wide variety of cables, conductors or cable trays.
EBS 6 L GKS – Perfect for mesh ducts, burr-free cuts in seconds
EBS 8 – Ideal for cable trays, bolts & medium-hard steel wire (ST 37), with a cutting force of 15 kN! – Perfect for tight and confined spaces
EBS 12 – Powerful all-rounder for cable trays, bolts and steel wire (ST 37) – strong 45 kN cutting force for maximum power
CABLE TOOLS
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.
MARECHAL P66 Connector is the highest performance plug and socket-outlet which has now secured extensive specifications for power distribution applications across industry with a market-leading current rating up to 660A and voltage capacity of 1,100V.
Thorne & Derrick, the UK Stockist & Channel Partner for Marechal Electric, recently welcomed Ross Allan (Area Sales Manager) for a Training Session with our Technical Sales Engineers to support the industry with innovative industrial power connection solutions.
Click ‘GET A QUOTE‘ to enquire for the P66 Connector and ‘Electrify Your Industry’:
P66
HV Connector | Rated For 660A High Current & 1100V High Voltage Distribution
The high voltage plugs and socket-connectors withstand harsh conditions and integrate into industrial high power systems requiring maximum reliability and performance.
High current – 660A
High voltage – 1100V (1.1kV)
8 Auxiliary contact + 2 pilots
Metal casing IK10
T °C : -40 °C / +80 °C
Safe pre-wired – Reed sensor switch
Robust – IP66/IP67 & IK10
User friendly connectors – drawing mechanism
Compact plug and socket – designed to fit in minimal confined space
Ease of installation – multiple mounting and wiring configurations
The P66 Connector is modelled to be all-purpose, whether it’s straight or angled, handles can be offered with a threaded plate to suit different cable diameters, allowing configuration variations – the high voltage power connector is lightweight, high-technology and easy to wire providing optimum versatility to international electrical safety standards.
MARECHAL | Plug, Sockets & Connectors
Established over 70 years ago, MARECHAL Electric are currently one of the worlds largest manufacturers of industrial electrical Plugs, Sockets & Connectors for commercial, industrial, hazardous area and high voltage applications. With over 500+ employees worldwide and a consolidated turnover of nearly €100 million, MARECHAL are established market-leaders in the manufacture of LV Power & Electrical Distribution Connection products.
600V to 66kV| Substation to Socket Connections for LV & HV Electrical Power
Heat shrink, cold shrink, push-on and slip-over cable accessories enable the jointing and connection of 11kV/33kV and 66kV-/132kV cables to oil, air or gas insulated switchgear, transformers, motors and overhead lines distributing electricity at medium/high voltages.
Redefining Safety Standards in Underground Power Maintenance
The PICOUP Ultra-safe, electrohydraulic power cable spiking and cutting tool range from PENTA UKI is setting a new standard for safety and simplicity in underground power cable maintenance. Designed without traditional hydraulic hoses, the PICOUP tools safely check the absence of voltage on underground cables without the hazards and complexities associated with explosive cartridges.
Unlike cartridge-driven spikers that rely on explosive charges to deadproof cables, the PICOUP tool employs a hydraulic system that eliminates the risks of unexpected discharge, misfire, and storage hazards, ensuring a safer working environment. The cable is immediately ready for the works after the use of PICOUP.
As the hydraulic system applies consistent, controlled force, it reduces the risks of cable over-damage and unintended electrical discharge. Cartridge-based spikers can apply uneven force, posing serious safety concerns for crews in the field.
Simplified by design, PICOUP’s user-friendly design is easy to learn, promoting safe and efficient usage among team members and its elimination of cartridges, makes preparation faster and reduces the risk of user error. Maintenance becomes effortless to as PICOUP tools bypass the rigorous inspections required for explosive-based spikers and make routine checks and servicing far simpler.
PICOUP Cable Spiking & Cutting Tool In The Field
Kevin Rushton, Managing Director of PENTA UKI said, “The PICOUP Safety Spiking and Cutting Tool is transforming safety in the industry, providing a highly reliable, non-explosive alternative to traditional cartridge-based systems. With safer force application, quieter operation, and streamlined usability, the PICOUP range is making underground cable maintenance not only safer but also more efficient.”
The unique PICOUP 400 from PENTA provides a combined “Spike & Cut” capability up to 140mm in a single-tool operation – exclusively stocked by Thorne & Derrick.
About PENTA UKI
PENTA UKI is an expert manufacturer of electrical safety solutions, driven by a commitment to ensuring your safety in every intervention.
PENTA UKI is trusted by Linesmen, Maintenance Technicians, and Electrical Engineers working across global electricity generation, transmission, and distribution networks, as well as 9 other critical industries. We safeguard your operations with cutting-edge safety technology designed to meet the highest standards in the most demanding environments.
