This video by 3M Electrical shows in what situations you would require a hazardous area joint such as 3M Scotchcast LVI/3 for jointing power cables in Zone 1 and Zone 2 hazardous areas and potentially explosive atmospheres according to the ATEX Directive.
3M LVI-3/x hazardous area resin cable joint kits are designed to be used for multi-core, armoured polymeric insulated, low voltage energy cables.
The 3M video explains how hazardous area cable joints are designed for applications where the cable joints must be flame retardant, halogen free and hydro carbon resistant.
3M have been supplying cable accessories and electrical insulating Scotchast resins for use in hazardous areas for more than 25 years and have carried out extensive research into the effects of hydrocarbons in chemical solvents and resin encapsulants.
3M products have been successfully installed in areas such as mines and quarries, underground applications, petrochemical sites and offshore areas where there is a risk of flame or explosion due to the atmospheric presence of flammable gases.
A specialised joint shell which is flame retardant, hydro carbon resistant and halogen free is filled with a 3M 1402FR resin which has been highly modified by the inclusion of various chemical additives. These additives make the resin flame retardant, halogen free and virtually unaffected by immersion and hydro carbons or chemical solvents.
Cold Shrink – invented by 3M over 40 years ago and now the preferred technology for heat-free jointing, terminating, sealing and abandonment of LV HV cables
We hope you find this video informative and educational, contact T&D for technical support, quotations and stock availability for 3M Hazardous Area Cable Joints.
Selecting Hazardous Area Cable Joints
Conductor CSA (mm2)
3M LVI-3 Scotchcast Resin Kit Reference For Jointing Power Cables In Hazardous Areas
Thorne & Derrick are leading specialist distributors of MV HV Joints, Terminations & Connectors for use on 11kV/33kV/66kV cable networks – sadly cable failures are increasingly common on onshore and offshore medium/high voltage cable networks.
A toxic cocktail of unskilled labour which is untrained in both basic cable preparation and tool use is usually the cause – this lethal combination unleashes devastation on clients assets nevermind the incalculable cost of downtime associated with power outages.
This investigation and report explains the causes into why the below 66kV cable joints failed by dissecting the cable joints one by one and recording findings to what could have caused the cable failings.
Severe cable joint failure with cable faulted to destruction – caused by a combination of cable preparation failures and factors.
Comparing dimensions from the screen cut length to the corrugated aluminium cut shows the 66kV cable failure occured at the end of the semicon screen cut.
Failure occurred at the end of the semicon screen cut on the high voltage power cable.
Specialist cable jointing tools to effectively prepare and remove semicon screens on 11kV/33kV and 66kV power cables should always be used by jointers – cable jointers should be trained and competent to install manufacturers products.
Poor heat shrinking technique by the cable jointer with non-uniform wall thickness on this heat shrink insulation tube
Conclusion
The cable joint failure was caused by the poor removal of the semi-conductive and the very bad XLPE insulation preparation. Deep and dirty cuts and burrs can seen in the insulation causing the XLPE insulation to be over stressed and this was what ultimately caused the insulation failure.
All HV cable joints and accessories should only be installed by trained professionals with all the correct accreditation. Any other terminations that have been installed by the above ‘jointer’ should be checked and replaced immediately.
Cold Shrink
3M pioneered the development of Cold Shrink technology for use as a material for the jointing, termination and connection of medium/high voltage cables. Since then cold shrink has been adopted by global utilities as a user-friendly and reliable MV-HV cable accessory range with high performance, stable life cycle and minimal joint or termination failure rates.
Should you require any support with the specification or supply of MV HV joints, terminations or connectors for use on 11kV/33kV/66kV energy networks please do not hesitate to contact us.
*Data based upon U.S. failure data of U.S. manufactured 3M Cold Shrink Medium & High Voltage Cable Accessories between 2009 and 2012.
Thorne & Derrick
THORNE & DERRICK are national distributors LV, MV & HV Cable Installation, Jointing, Substation Earthing & 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.
Application: Medium Voltage Switchgear Primary Distribution
Primary Switchgear Type: SF6 Gas Insulated 33kV
Contributor: Matthew Collins (Business Development Manager at Ormazabal)
Featured Manufacturer: Ormazabal (Spain)Â
Client: Western Power Distribution (WPD) UK DNO
Sector: Utility Â
Ormazabal 33kv Switchgear
Medium Voltage Primary Distribution
Ormazabal CPG.0 range of CPG MV switchgear comprises of a full assembly of modular cubicles up to 24kV / 2500A and 33/36kV / 1250A, GIS (Gas Insulated Switchgear) type, with SF6 insulation, for the configuration of primary distribution electrical networks operating at medium voltages. Types of Ormazabal functional 33kV MV switchgear:
MV Circuit Breaker CPG.0-V
MV Busbar Coupling CPG.0-C
MV Disconnector CPG.0-S
MV Fuse Protection CPG.0-F
MV Busbar Rise CPG.0-RB
Ormazabal 33kV switchgear pictured prior to factory testing – the MV primary switchgear is with a standalone busbar protection panel designed in accordance with WPD engineering specification
The installation of elements that allow to withstand an internal arc in all Medium Voltage compartments, together with an advanced design that provides total resistance against external factors, ensures Ormazabal CPG.0 cubicles are the ideal solution for using in 33kV substations providing a safe and reliable distribution of medium voltage electricity.
33kV Medium Voltage Switchgear
33kV switchgear for use in a wide range of installations:
Utilities
Industrial sector
Primary distribution substations
Cement industry
Mining industry
Mobile substations
Switching substations
Textile industry
Food industry
Electrical power stations
Chemical and petrochemical industry
Substation
Steel industry
Automotive industry
Airports and railways
Wind farms
WPD Western Power Distribution – A UK DNO
Western Distribution Power
Electricity is distributed UK countrywide via the National Grid at 275kV or 400kV and is transformed to 132kV for regional distribution at substations, known as Grid Supply Points, by the Distribution Network Operator (DNO).
Western Power Distribution is a electricity distribution network operator (DNO) for the Midlands, South West and Wales in the UK.
They deliver electricity to over 7.8 million customers over a 55,500 square kilometres service area. With a network consisting of 220,000km of overhead lines and underground cables, and 185,000 electricity substations.
WPD – UK DNO
MV Switchgear Terminations 33Kv
Should you require any assistance with the selection or specification of MV Joints & Terminations for use with medium voltage switchgear please do not hesitate to contact us.
T&D distribute both Pfisterer inner cone plugs and Nexans Euromold outer cone separable connectors for terminating 33kV cables into SF6 gas insulated MV switchgear.
Nexans Euromold connectors are manufacturer approved for terminating high voltage cables into Ormazabal MB24kV Compact Transformer Substations – Ormazabal MB is an associated type Compact Equipment Assembly to be installed in Prefabricated Transformer Substations or in housings constructed to be Transformer Substations in distribution networks up to 33kV/36kV.
Euromold 400LR interface B
Elbow connector FOR SWITCHGEAR BUSHINGS
For 400A/630A bushings in 11/12kV and 20/24kV switchgear the following Euromold type connectors can be used to terminate medium/high voltage power cables into Ormazabal MB24 equipment.
T&D distribute the most extensive range of LV, MV & HV Cable Jointing, Terminating, Installation & Cable Pulling Equipment – we service UK and international clients working on underground cables, overhead lines, substations and electrical construction at LV, 11kV, 33kV and EHV transmission and distribution voltages.
Contributor: Matthew Taffs EHV Cable Jointer & Director at CRS (Cable Repair Services) Ltd
Featured Manufacturer:Â Glovers (W T Glover)
Client:Â SSE
Sector: Utility Â
66kV Cables
Gas Filled High Voltage Cable Jointing
The 66kV 3 core high pressure (200 psi) gas joint (nitrogen) was made for SSE by Matthew Taffs of CRS Ltd and John Beck both working for Balfour Beatty at the time.
The 66kV cable construction was oval copper conductor with a lead sheath and steel reinforcing tapes with hessian wrapped layer. The manufacturer of the cable joint was Glovers (W T Glover) of Trafford Park, Manchester which later became part of BICC.
The cable joint is from the 1950’s and when the joint was unpacked from the wooden create it was still packed in straw. The insulation of the cable had to be stepped down to the conductor known as pencilling using piano wire and weights.
The joint consisted of a two piece split ferrules which was sweated on the conductor with tinmans metal. Once sweated the ferrule was cleaned up and the insulation was ready to be applied. The insulation was flat/plain paper tapes (not crepe) coated in a thin layer of grease and was applied with care by the jointer. Once built up to the final diameter the end profiles had to be skilfully teared down using piano wire and weights again. The metallic screen reinstated from one side to the other and then each core is covered in terylene tape.
Both end cable glands of the joint had internal plumbs /wipes and when the plumbing was finished – hot oil was poured on followed by a hot metal into the cable gland to reinforce the steel tapes and lead sheath as this 66kV cabling system is such high pressure it would split the lead sheath.
Once the 66kV joint was finished the jointer bolted the sleeve to the cable gland and turn on the nitrogen gas and check for leaks. The 66kV joint could be protected in either a Glo (Glovers) Sleeve filled with compound/ bitumen or heat shrink. The job was project managed by Gary Horne, now of CRS (Cable Repair Services) Ltd.
66kV 3 Core Glovers Gas (HP) Cable Joint
66kV Polymeric Cables
21st century cable manufacturing is dominated by polymeric type insulated cables and for offshore wind farm power generation including subsea power, array, inter-array and intra-array cables – to support this type of 66kV high voltage cable infrastructure Thorne & Derrick via their distribution agreement with Nexans can supply a complete range of joints, terminations, connectors and surge arresters detailed below.
Ad: Two Times More Power. Jointers! Empower your CV and skill-set by grasping the 66kV Jointer Training opportunity. Jointers must currently be 33kV Competent and experienced to be ready to undertake the step-up to 66kV from 33kV.
Pictured: Prysmian type tested a 3-core 66kV EPR insulated “wet-design” cable system with aluminium conductor (copper is also available) – and integrated optical element. The solution includes factory, field cable joints, plug-in cable terminations and cable cleats, using proprietary Prysmian Click-Fit™ technology combinings the use of EPR insulation.
66kV Cables – Offshore Wind Farms
Company History –Â Walter T. Glover & Co
Walter T. Glover & Co of Trafford Park, Manchester and London, were electrical cable manufacturers.
1868 – Company founded with premises at the Bridgewater Street Iron Works in Salford. The founder, Walter T. Glover, was a commercial machinery agent for the Lancashire cotton industry.
1959 – BICC acquired 50% of Submarine Cables Ltd which was used to manufacture and install power cables. Glover’s submarine cables were used to link England and France, and the north and south islands of New Zealand. However, although the company appeared to be doing well, there was increasing international competition to supply cables. The south side of the Trafford Parks works was integrated into the newly formed Wiring and General Cables Division of British Insulated Cables (BICC).
Trip down memory lane…………….
W.T. Glover, Trafford Park, cable being laid over a cofferdam, 1911
W.T. Glover, Trafford Park, Installation of cabling in Ebbw Vale, 1905
W.T. Glover, Trafford Park, installation of cabling, with motor vehicle clearly visible, 1905
W. T. Glover and Co – 1970 The Trafford Park factory was closed, but the Glover brand continued as part of BICC.
T&D distribute the most extensive range of LV, MV & HV Cable Jointing, Terminating, Installation & Cable Pulling Equipment – we service UK and international clients working on underground cables, overhead lines, substations and electrical construction at LV, 11kV, 33kV and EHV transmission and distribution voltages.
C&P Awarded Contract for 30MW STOR Gas Generation Facility
Press Release By Tristan Jones (Sales & Marketing Manager - C&P Engineering Services Ltd)
C&P Engineering Services are delighted to announce that is has been awarded the design and build contract by Enersyst Limited (part of the Walters Group of Companies) for a STOR (Short Term Operating Reserve) 30MW Gas Generation Facility, located off Smoke Lane in Avonmouth, Bristol.
Short Term Operating Reserve
The 30MW STOR facility is one of a number of projects created to service National Grid balancing services. STOR is a demand-side service used by National Grid to provide additional active power from generation or demand reduction. The contract will include full civil and electrical design and build balance of plant works and will include designing, engineering, supplying, installing, constructing, testing and commissioning a fully furnished and operational 30MW gas STOR generation facility.
The project will finally consist of fifteen containerised gas powered gensets, together with associated infrastructure, including vehicle access, pedestrian walkways, foundations, site electrical works, SCADA, substation, control room, transformer and other ancillary items.
The site was first developed in the mid-1960s by Butler Chemicals and was subsequently occupied by Albright and Wilson (1967), Tennaco (1984) and Rhodia (2000). Albermarle Chemicals UK Ltd purchased the site from Rhodia in 2003. The majority of the demolition completed by early 2013.
Over the next 12 months C&P will be working on the design, electrical infrastructure, scada system, cable system, switchgear, M&E fit out of the control building, auxiliary supply to the control building, grid compliance, design of capacitor bank, design and installation of earthing network, testing, commissioning and energisation of the 33kV private network.
David Demock, HV Engineering Manager commented: “This is C&P’s first project with Enersyst and we’re excited to deliver the full balance of plant elements of this 30MW site and a fully operational gas STOR generation facility”.
High Voltage Electrical Services
11kV | 33kV | 132kV
C&P Engineering Services deliver specialist High Voltage Electrical Services to a diverse range of customers in the oil, gas, chemical, petrochemical, heavy engineering, industrial, commercial, construction, renewable energy and nuclear sectors. Services cover design, erection, testing and commissioning and operating for both new HV electrical installation and refurbishment up to and including 132kV.
About C&P Engineering Services
C&P Engineering Services is an electrical and instrumentation engineering solutions provider, providing specialised HV Design & Build Services for 11kV, 33kV and up to 132kV electrical distribution networks. C&P’s high voltage division delivers full balance of plant works for high voltage electrical projects such as STOR, Battery Storage, Wind Energy, Bio Mass, Marine, Offshore Wind, Manufacturing, Nuclear, Petrochemical, Oil and Gas, Chemical and Power Generation.
C&P’s other integrated EC&I engineering services can be combined to provide the total EC&I engineering solution or divided into the following design & build and operation and maintenance specialist areas:
• Instrumentation, Control & Automation
• High Voltage & Extra High Voltage – 11kV | 33kV | 132kV
• Low Voltage Electrical
• Hazardous Area ATEX Electrical & Instrumentation
THORNE & DERRICK are national distributors of LV, MV & HV Cable Installation, Jointing, Duct Sealing, Earthing & 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.
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.Â
Discussion subjects include cable installations, cable jointing, substation earthing, 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.
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