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#ThrowbackThursday Film – The Heart of the System

  uploaded by Chris Dodds - Sales & Marekting Manager at Thorne & Derrick International

This film is dedicated to the engineers, designers, operators and artisans whose untiring efforts to provide, maintain and improve the distribution of electric power have helped to create our modern way of living.

A film about how hydro-electric power is harnessed, generated, transformed, and distributed by Hydro Quebec. Shots include: building transmission towers and installing cable; designing and building power sub-stations in the Montreal area, to service the city as it grows; an animated sequence showing how a transformer takes high voltage power and converts it into usable units for distribution to communities and businesses; a demonstration of how an emergency repair crew reacts to a power failure.

Thorne & Derrick

THORNE & DERRICK are national distributors LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment – we service UK and global businesses involved in cable installations, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV.

Since 1985, T&D have established an international reputation based on SERVICE | INTEGRITY | TRUST.

Contact us for 3M Electrical, ABB, Alroc, AN Wallis, CATU Electrical, Cembre, Centriforce, CMP, CSD, Elastimold, Ellis Patents, Emtelle, Euromold, Filoform, Furse, Lucy Electric & Zodion, Nexans, Pfisterer, Polypipe, Prysmian, Roxtec, Sicame, WT Henley.

Invitation

Thorne & Derrick invite you to join LinkedIn’s largest LV-HV Electrical Discussion Group : Low & High Voltage Power, Cabling, Jointing & Electricals. Discussion subjects include cable installations, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV. Network, engage and promote your profile, company or products with over 10,000 influencers.

11kV Cable Pulling – What Is The Maximum Distance For Ease of HV Cable Pulling Between Manholes?

Thorne & Derrick | Cable Laying & Pulling Equipment Distributors | LV MV HV

• Uploaded By Chris Dodds – Thorne & Derrick Sales & Marketing Manager

Cable Pulling

In response to a question posed on Voltimum, the leading electrical industry portal, Nexans provided the following answer in reply about the maximum 11kV cable pulling distances between manholes when laying medium/high voltage power cables using cable socks.

T&D, the UK’s leading Cable Pulling & Laying Equipment Supplier, can provide expert technical recommendations and support for all cable pulling and laying projects into both open trench (directly buried) and cable duct.

Important procedural requirements apply to the installation of all MV-HV underground cable pulls irrespective of the method used.

Installation shall be carried out by experienced cable pulling teams with a thorough understanding of the risks specific to the installation methods being used. The installation design, cable pulling equipment and techniques shall be designed to:-

• Minimise cable pulling forces on MV-HV cables
• Cause no damage to MV-HV cable sheaths during handling/installation into duct or trench

Often cables are snagged or damaged by bedding or backfill materials during the the cable pull process on the cable trench bed – contact us to discuss cable sheath repair products.

Pictured : Manhole Cable Rollers – care must be taken during high voltage cable pulling not to exceed the maximum pulling force and tension to avoid 11kV cable damage. The cable rollers are designed for placing at the edge of the manhole or pit entrance to ease the cable into position.

Cable Rollers – Order Code ML5

11kV

Question: I’m installing a high voltage 11kV cable in PVC sleeves and I want to introduce manholes on the straight length of the HV power cable route. What will be the maximum distance you would recommend for ease of high voltage cable pulling of the 11kV cable from one manhole to the other?

Answer: This can only be answered properly on a case-to-case basis as it depends a lot on the topography and direction of the proposed 11kV cable pulling route.

This is especially so in urban areas where many bends may be necessary to avoid underground utility cables and pipes such as like sewers, water and gas. If there are no bends, we have still must consider the friction coefficient of the particular cable duct with the 11kV cable.

Of course, cable lubricants can be used as long as they do not harm the sheath material or the duct material – lubrication of the 11kV will reduce the co-efficient of friction of the cable pull between the 11kV cable sheath and inner cable duct wall.

If we speak about 11kV triplex cables, you will get them only in smaller lengths because of the diameter – I suppose 350m on a perfectly straight line shouldn’t be a problem.

But please take into consideration the maximum pulling force, which is: 30N/mm2 of conductor cross-section for aluminium conductors and 50N/mm2 of conductor cross-section for copper conductors.

Going above these forces can damage the 11kV cables and maximum cable pulling vary according to the specification of the medium/high voltage cable.

Press Release | Thorne & Derrick Appointed Approved Stockist for UK Leading Cable Pulling Equipment Manufacturer

Maximum Cable Pulling Tensions

High Voltage Cables Up To 33kV

Maximum permissible pulling tensions for each 11kV/33kV cable type are given below.

These cable pulling tensions must not be exceeded under any circumstances. Efforts should always be made by the cable pulling teams to achieve lower figures by careful setting out of the work and positioning of the MV-HV cable drum.

♦ Info: Scottish Power Energy Networks, CAB-15-003: Handling & Installing Cables Up To 33kV 

Risk Of Arc Flash & Safe Digging

Civil engineering contractors, jointers and pulling teams must be aware of the arc flash dangers associated with utility excavations when working around buried services including electricity cables.  Attention is drawn to the requirements and recommendations contained in Health and Safety Executive guidance notes HSG47 “Avoiding Danger from Underground Services” and HSG185 “Health and Safety in Excavations”. UK DNO’s publish guideline documents about “Safe Digging” and these can be consulted online.

➡ Blog: Can Arc Flash Clothing Save Utility Workers Lives?

Arc Flash Protection Clothing & Garments | Polo Shirts | Jackets | Coveralls | Trousers | Sweatshirts | Helmets | Gloves | LV MV HV

High Voltage Cable Pulling

Calvi Electric Company uses Southwire A-Frame truck to facilitate a 1300′ high voltage cable pull through a manhole system. During the video you will observe the high voltage cable being taken up in sections. At the other end of the cable pull a Greenlee Ultra Tugger set up is located, the average for this cable pull was 6 ft per second.

The reason for the sporadic uptake was variable stretch and tension being placed on the cable pulling rope. The total length of the HV cable pull was 1270′. The utility learned that with the ease at which the Southwire A-Frame trucks payoff that it was not necessary to have this large of a crew to handle the consolidation of cable into the trunk of the cable pull. Once set up this cable pull could have been performed with 4 crew members. Additional crew members were necessary and productive in initial manhole set-up, reel set-up and attending to manholes where the wire was being pulled straight through.

Sealing Cable ducts

Where electricity, pilot and telephone cables are installed into electricity cable ducts the utility engineering standard would normally recommend all cable ducts entering substations and buildings to be duct sealed to prevent the ingress of water and gas – this also applies to 33kV, 66kV and 132kV high voltage substation cables where cable transits are required.

Thorne & Derrick distribute an extensive range of Duct Sealing & Cable Transit Systems to protect utility assets and provide flood protection to substations from water entry via unsealed cable ducts and building penetrations.

Cable Pulling & Cable Laying Equipment Suppliers & Distributors

Thorne & Derrick International distribute the most extensive range of Cable Pulling & Cable Laying Equipment to enable the installation of low, medium and high voltage power cables into underground trench or duct – products also supplied for fibre optic blowing, subsea trenching, offshore umbilical installations and pulling armoured cables onto cable tray.

More Cable Pulling Blogs

• Cable Laying & Pulling – Installing LV-HV Cables Into Trench
• Cable Laying & Pulling – Installing LV-HV Cables Into Duct
• Cable Pulling Equipment – A Cable Laying, Duct & Installation Guide From SSE
• Cable Pulling Equipment – A Cable Duct Laying Guide From BT Openreach

Cable Blowers | Cable Lubricant | Duct Rods | Cable Socks | Cable Jacks | Cable Rollers | Cable Protection Covers MV HV | Cable Joints MV HV | Duct Sealing

Nexans Euromold Bushings & Connectors – How To Select & Specify MV HV Switchgear & Transformer Connectors

Uploaded By Chris Dodds – Thorne & Derrick Sales & Marketing Manager

Euromold Bushings

What Is The Function Of Bushings?

Bushings are electrical equipment devices designed to distribute electric power and energy through a grounded barrier, such as the wall of a transformer or switchgear. The Euromold epoxy bushings provide an insulated and screened connection between the conductors in the equipment and conductor of the cable.

Nexans Euromold are world leaders in the manufacture of Screened Separable Connectors to enable the safe termination of medium voltage and high voltage power cables onto outer cone bushings of electrical equipment including switchgear, transformers and motors up to 66kV – cable connectors for the termination of MV-HV cables into gas insulated switchgear are also available with inner cone bushings, see inner cone plugs.

Euromold connectors are approved by leading gas insulated switchgear and electrical equipment manufacturers including ABB, Schneider, Brush and Siemens.

All Nexans Euromold connectors are 100%  AC withstand and partial discharge tested at Nexans factory prior to shipment.

Euromold bushings are deadbreak bushings for de-energised systems – the power has to be switched off before the connector can be disconnected from the bushing.

The following article enables the correct selection and specification of Nexans Euromold connectors depending on a) cable specification and b) electrical equipment bushing type (A, B, C, D, E or F). The diameter over the core insulation of the cable to be terminated is critical to the reliable performance of separable connectors.

T&D provide an informative overview of the 6 Bushing Interfaces common to MV-HV electrical equipment with dimensions according to European CENELEC EN 50180 and 50181 – this should benefit the electrical design engineer, project manager, project engineer and cable jointer.

Some tips and hints are provided by kind courtesy of the Nexans UK Team.

Nexans Euromold Separable Connectors

Features & Benefits

• Compact Cable Terminations: Fully screened enabling connectors to be installed in close proximity to surrounding steel work and other connectors. Connectors can be touching if required
• Electrical Safety: Safe to touch and weatherproof. Euromold connectors offer excellent mechanical strength
• System Flexibility: The connectors can be disconnected and re-used making the movement of equipment possible without having to re-terminate MV-HV cables
• Ease Of Installation: Nexans Euromold connectors are suitable for use on all polymeric screened MV cable types up to 42kV/66kV

Nexans Euromold connectors must be fitted onto the correct bushing when installed and can be used to terminate both single and 3 core medium voltage cables.

Multiple medium/high voltage cables can be connected per bushing by double-stacking or “piggy-backing” providing flexible solutions to complex cable termination applications.

Bushing Interfaces

The MV-HV electrical equipment to which Nexans Euromold connectors are fitted to must have the correct bushing Interface and be designed to suit the cable specification.

Euromold connectors are suitable for connecting single and 3 core polymeric insulated cables with copper wire or tape screens up to 33kV – this has recently been increased to 66kV/72kV to cater for offshore wind farm cable terminations onto 66kV equipment in wind turbines.

Euromold Overview

• 180AR-1 – Interface A1 equipment bushing
• 180AR-2 – Interface A1 equipment bushing
• 180AR-3 – Interface A1 equipment bushing
• 180A-24P-O – Interface A1 in-air bushing
• 400T1 – Interface B2 equipment bushing
• 400AR-1 – Interface B2 equipment bushing
• 400AR-2 – Interface B2 equipment bushing
• 400AR-8 – Interface B1 equipment bushing
• 400SFR-P – Interface B2 equipment bushing
• 400AR-3 – Interface C1 equipment bushing
• 400AR-4 – Interface C2 equipment bushing
• 400AR-5 – Interface C2 equipment bushing
• 400AR-6 – Interface C1 equipment bushing
• 400SFR-B – Interface C2 equipment bushing
• 400A-24B – Interface C1 in-air bushing
• 670AR-2 – Interface D2 equipment bushing
• 900AR-1 – Interface F3 equipment bushing
• 900AR-2 – Interface F2 equipment bushing
• 900AR-3 – Interface F1 equipment bushing
• 900AR-4 – Interface F1 equipment bushing

Short circuit ratings for Interface Bushings

Euromold Connectors 200 Series

Interface Type A Bushing

• Connector Type :  7.9mm Plug-In Pin Contact
• Voltage Range : 11/12kV-24kV
• Current Rating : 250amps
• Specification : CENELEC EN50180 & EN50181

Euromold 158LR Elbow Connectors are used with 200 Series Interface A Bushing – a Euromold 152SR straight connector option is also available.

Interface A can be identified by the 6 tabs common to 200amp load break systems typical to padmounted transformer applications.

Includes a push-on pin contact bail rather than bolt for connecting to unthreaded medium voltage bushings. The 200 series range of connectors for use with Interface A bushings are common to low powered 11kV transformers typically providing tap-off or direct feed of medium voltage power to remote locations.

➡ See Interface A Connectors & Bushings From Nexans Euromold

Euromold Connectors 400 Series

Interface Type B Bushing

• Connector Type : 14mm Plug-In Pin Contact
• Voltage Range : 11/12kV-33/36kV
• Current Rating : 400amps
• Specification : CENELEC EN50180 & EN50181

Euromold 400LR Elbow Connectors are used with 400 Series Interface B Bushing.

Interface B is common to France and French manufactured medium voltage electrical equipment and Alston Grid Turkey oil type transformers up to 33kV. Interface B bushings are pin-type connectors, not bolted, to the bushings..

➡ See Interface B Connectors & Bushings From Nexans Euromold

Euromold Connectors 400 Series

Interface Type C Compact Bushing

• Connector Type : M16 Bolted Copper Insert
• Voltage Range : 11/12kV-33/36kV
• Current Rating : 630amps | 1250amps
• Specification : CENELEC EN50180 & EN50181

Euromold 430TB Elbow Connectors are used with 400 Series Interface C Bushing.

Bolted M16 Nexans Euromold connectors suit 630amp switchgear systems and can be “piggy-backed” using couplers to terminate multiple cables per phase in compact switchgear – common to the UK switchgear market including both air and gas insulated type equipment.

The physical dimensions of the Interface C connectors are identical to the specification of Interface B design but with bolted contacts.

Interface C1 is 630Amp whereas Interface C2 is 1250Amp.

➡ See Interface C Compact Connectors & Bushings From Nexans Euromold

Video : Nexans Euromold 430TB Tee Connector 11kV-33kV

Euromold Connectors 400 Series

Interface Type C Symmetrical Bushing

• Connector Type : M16 Bolted Copper Insert
• Voltage Range : 11/12kV-42kV
• Current Rating : 1250amps
• Specification : CENELEC EN50180 & EN50181

  ➡ See Interface C Symmetrical Connectors & Bushings From Nexans Euromold

Euromold Connectors 600 Series

Interface Type D Bushing 800Amp

• Deadbreak Connector Type : Bolted 5/8″ Aluminum Stud
• Voltage Range : 12kV-25kV
• Current Rating : 800amps
• Specification : CENELEC EN50180 & EN50181
• Specification : ANSI / IEEE 386 & 404

Type D Bushing – 1250Amp

• Deadbreak Connector Type : Bolted 5/8″ Copper Stud
• Voltage Range : 12kV-25kV
• Current Rating : 1250amps
• Specification : CENELEC EN50180 & EN50181
• Specification : ANSI / IEEE 386 & 404

Interface D bushing connectors are available in both 800A Aluminium (Interface D1) or 1250A Copper (Interface D2).

➡ See Interface D Connectors & Bushings From Nexans Euromold

Euromold Connectors 700 Series

Interface Type E Bushing 800 Amp 

• Deadbreak Connector Type : M16 Bolted Aluminium Insert
• Voltage Range : 12kV-42kV
• Current Rating : 800amps
• Specification : CENELEC EN50180 & EN50181
• Specification : ANSI / IEEE 386 & 404

Type E Bushing – 1250 Amp

• Deadbreak Connector Type : M16 Bolted Copper Insert
• Voltage Range : 12kV-42kV
• Current Rating : 1250amps
• Specification : CENELEC EN50180 & EN50181
• Specification : ANSI / IEEE 386 & 404

➡ See Interface E Connectors & Bushings From Nexans Euromold

Interface E bushing connectors are available in both 800A Aluminium (Interface E1) or 1250A Copper (Interface E2).

Euromold Connectors 900 Series

Interface Type F Bushing 2500 Amp 

• Connector Type : M16 Bolted Copper Insert
• Voltage Range : 12kV-42kV-66kV
• Current Rating : 2500amps
• Specification : CENELEC EN50180 & EN50181

➡ See Interface F Connectors & Bushings From Nexans Euromold

Interface F bushing connectors are available in 630A (Interface F1), 1250A (Interface F2) and 2500A (Interface F3) with tee connector design and supporting range of coupling connectors up to 66kV.

As a rule, ANSI specification type Interface D and Interface E connectors are usually black coloured whereas types A, B & C are orange-brown in colour.

Nexans Euromold surge arresters can be provided depending on the medium voltage earthing system design.

 ♦ Further Reading About Bushings & Connectors Applications

Thorne & Derrick

Nexans Main UK Stockist & Distributor

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

Euromold 200 Series Connectors | Interface A Bushings | Nexans Euromold

Euromold 200 Series Connectors | MV HV

➡ To view the complete range of Euromold 200 Series Connectors and medium/high voltage cable accessories for use with Interface A Bushings please see below.

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 HV 

LV Cable Accessories

T&D stock and supply cable accessories to Cable Cleat, Gland, Joint & Terminate armoured/unarmoured multicore (SWA) or single core (AWA) power cables into low and high voltage substations – the LV cable installation accessories support electricity distribution to main distribution switchgear, sub-distribution boards and transformers.

CMP Glands | 3M Joints | Cembre Lugs | Ellis Cleats | LV Cable Accessories

Euromold 400 Series Connectors | Interface B Bushings | Nexans Euromold

Euromold 400 Series Connectors | MV HV

➡ To view the complete range of Euromold 400 Series Connectors and medium/high voltage cable accessories for use with Interface B Bushings please see below.

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 HV 

LV Cable Accessories

T&D stock and supply cable accessories to Cable Cleat, Gland, Joint & Terminate armoured/unarmoured multicore (SWA) or single core (AWA) power cables into low and high voltage substations – the LV cable installation accessories support electricity distribution to main distribution switchgear, sub-distribution boards and transformers.

CMP Glands | 3M Joints | Cembre Lugs | Ellis Cleats | LV Cable Accessories