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Roxtec H3 Cable Transit Seals – How To Seal Substation Cables

• uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager

Roxtec

Thorne & Derrick are distributors for Roxtec, the leading manufacturer of sealing solutions for cables and pipes, to protect electricity Transmission & Distribution assets including substations against water, gas and fire.

Roxtec H3 cable transit seals are ideal for the protection of cables and substations against constant running water entering Low, Medium & High Voltage Substations via concrete and brick foundations – the Roxtec H3 is a three-part cable transit seal that is easy to install including in wet conditions and in environments with running water; the system is suitable for normal and flood condition installation.

The cable transit withstands extreme cable bending and has a +5mm tolerance towards the aperture as well as an indicator showing when a compressed seal is achieved. The cable seal can be installed into sleeves, conduits and core drilled holes.

Partial Discharge Prevention

The Roxtec range of cable transits are resistant to constant and catastrophic water pressure and by providing firm cable retention with the cable seals forming a defence barrier against humidity and the risk of partial discharge – this ensures and maintains the optimum and uninterrupted service of substations reducing the risk of power outages.

The cable sealing system has been adopted by power utilities in the UK and overseas to seal 11kV/33kV cables – this includes both multiple single core cables in Trefoil and Triplex arrangement (BS7870) and 3 core polymeric insulated cables (XLPE & EPR including BS6622).

Below is a best practice installation guide for sealing substation cables with Roxtec H3 cable transit seals.

Installation In A Roxtec Knock-Out Sleeve

Remove the knock-out of the sleeve before inserting the seal.	The seal can be installed from the outside of the structure.	The seal can also be installed from the inside of the structure.	The seal must always be installed in the correct end of the knock out sleeve.

Installation In A Core-Drilled Hole

Installation of seal into a core-drilled hole. Use a hole saw with the appropriate diameter.

Installation In A Bolted Sleeve
For retrofit purposes an openable Roxtec sleeve can be used.

Use the flange as template for the drilling of the bolt holes.	Attach the frame to the structure using suitable sealing method and suitable stainless fasteners.

Installation In A Welded Sleeve

Weld the Roxtec sleeve to the cabinet/wall

Installation Of Cable Seals

Thorne & Derrick, working with Roxtec, can provide on-site installer training for all cable transit and sealing systems to ensure effective protection against flood damage or flammable gas migration on 132kV/66kV/33kV/11kV substations and battery rooms.

Measure the aperture according to the table below.	Remove any dirt from the sleeve/ hole.	Pull the pipes/cables through	Cables shall go straight through the seal.
Make sure that the bolts of the seal are loose.	Adapt rubber layers to fit the cables.	Test with a cable. Achieve a gap of 0-1.0 mm between the rubber halves. Adapt the layers for all cables. The halves may not differ by more than one layer.	Lubricate the three parts of the seal all around.
Insert the seal into the sleeve. Leave a 10 mm margin to simplify the installation of the last piece.	Press all three parts of the seal into the sleeve simultaneously.	If necessary, use a rubber hammer.	Tighten the screws crosswise one turn at a time. Start with the inner screws.

Signs Of Compressed Seal

The seal is compressed when the rubber expands through the fittings and when the inner part bulges.		Sectional view of the seal showing when rubber expands and bulges. The required torque depends on several things, e.g cable or pipe size, amount of used lubricant, sleeve size or material in the cable sheath.

Disassembly Of Cable Seal

Release compression by untightening all the screws.	Use a suitable tool to remove the halves of the H3 seal. Be careful not to damage the seal.

Reinstallation Of Cable Seal

Make sure that the inside surfaces of the exposed packing space are free from dirt or dust.	Adapt halves, which are to hold the additional cables or pipes, by peeling off layers until you reach the gap seen in pic. 3. The number of layers may not differ by more than one between the halves.	Achieve a gap of 0-1.0 mm between the rubber halves. If not, repeat 2.	Lubricate the inside surfaces all around with Roxtec Lubricant, especially into the corners. Continue reinstallation from step 7.

➡ Note:

• Wait 24 hours or longer after installation before exposing the cables or pipes to strain or pressure
• Operating temperature range of cable seals is +4 to +40 °C
• Cables shall go straight through the transit seal
• Cable/pipe with considerable weight needs to be supported to prevent damage or subsidence to the seal
• Do not peel off the last rubber layer of each Roxtec module half

Roxtec UG Cable Transit Seals Product Range

Roxtec Part Number	Aperture Ø (mm)	Clearance Depth (mm)	Cable/pipe Range Ø (mm)
Roxtec H3 135 UG	135-140	75	0+23-43
Roxtec H3 150 UG	150-155	75	0+24-52
Roxtec H3 185 UG	185-190	75	0+48-64
Roxtec H3 200 UG	200-205	75	0+48-68

Cable Transits – Roxtec

Thorne & Derrick Specialist Electrical Distributor

Established since 1985, T&D distribute the most extensive range of LV, MV & HV Cable Jointing, Terminating, Pulling & Installation Equipment – contact us today for a competitive quotation.

Key Products : MV Joints & Terminations, Cable Cleats, Duct Seals, Cable Transits, Underground Cable Protection, Jointing Tools, Feeder Pillars, Cable Duct, Earthing & Lightning Protection, Electrical Safety, Cable Glands, Arc Flash Clothing Protection & Fusegear.

Distributors for : 3M, Pfisterer CONNEX, Nexans Euromold, Elastimold, Catu, Roxtec, Emtelle, Centriforce, Lucy Zodion, Alroc, Hivotec, Cembre, Prysmian, Ellis Patents, ABB & Furse.

T&D Providers Of Jointer Training Courses By Pfisterer CONNEX & Nexans Euromold

3M Cold Shrink HV Joints Splicing 66kV XLPE Cable

• Application: Jointing Polymeric Insulated (XLPE) 66kV Single Core Cables
• Cable Type: 66kV XLPE Insulation – High Voltage Power Cables
• Cable Jointer: Chris Barker (EHV Cable Jointer)
• Featured Manufacturer: 3M Electrical

Cold Shrink

The use of Cold Shrink applied cable accessories, including joints and terminations, has been adopted by UK and international power utilities for the connection, repair and upgrade of medium/high voltage power networks typically operating at 11kV, 33kV and 66kV.

Here, the cable jointer has used 3M Cold Shrink Cable Joints to effectively joint and connect the

3M Cold Shrink HV Joints Splicing 66kV XLPE Cable

Thorne & Derrick Specialist Electrical Distributor

Established since 1985, T&D distribute the most extensive range of LV, MV & HV Cable Jointing, Terminating, Pulling & Installation Equipment – contact us today for a competitive quotation.

Key Products : MV Joints & Terminations, Cable Cleats, Duct Seals, Cable Transits, Underground Cable Protection, Jointing Tools, Feeder Pillars, Cable Duct, Earthing & Lightning Protection, Electrical Safety, Cable Glands, Arc Flash Clothing Protection & Fusegear.

Distributors for : 3M, Pfisterer, Nexans Euromold, Elastimold, Catu, Roxtec, Emtelle, Centriforce, Lucy Zodion, Alroc, Hivotec, Cembre, Prysmian, Ellis Patents, ABB & Furse.

Invitation

Thorne & Derrick are inviting you to join LinkedIn’s fastest growing Discussion Group : Low & High Voltage Power, Cabling, Jointing, & Hazardous Area Electricals (LV-HV).

Discussion subjects include cable installations, cable jointing, electrical 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.

HV Cable Jointing, Substation, Electrical & Mechanical Engineering Services (up to 400kV)

MRR Energy Services

• Guest Post by Claire Carr - MRR Energy Services (Operations & Strategy Manager)

MRR Energy Services is a service provider to the Multi-Utilities, Transmission and Distribution, Oil & Gas and Renewable Industries providing HV Services with the addition of project manpower provision providing engineering, technical and construction professionals on a permanent, temporary and project basis – this includes trained and competent high voltage cable jointing teams for UK and international projects.

As a service provider to the Multi-Utilities, Transmission and Distribution, Oil & Gas and Renewable Industries MRR works closely with market leading contractors and companies focused on supplying global engineering and technical manpower solutions, including the delivery of High Voltage Electrical & Mechnical Services for Substation Installation & Maintenance up to 400kV.

MRR Energy Services are focused on providing niche technical, commercial, management and board level functions globally with extensive experience working across a wide range of industries and clients from PLC to start-up  – this includes provision of high voltage cable jointers with current Jointer Training Competency Certification from market-leading manufacturers including Pfisterer Connex, Nexans Euromold and 3M Cold Shrink.

MRR Energy Services are ISO 9001:2015 UKAS accredited.

What Do MRR Energy services Do?

Site Professional Services

• Project & Site Management
• Project Support & Coordination
• Technical Support

Turnkey Subcontract Works

• Civil Works
• Electrical Installation
• LV & HV Cable Installation
• LV Cable Jointing
• HV Cable Jointing

Labour Supply & Fault Works

• Civil & Groundworks Operatives
• Formwork & Steel Fixers
• Plant Operatives
• NRSWA Operatives
• Confined Spaces Operatives
• HV Cable Installation Operatives
• Onshore/ Offshore Cable Jointers (up to 400kV)
• Safe Excavations In Accordance With HSG 47
• No-dig Methods e.g. shot blast, air lance
• Cable Jointing Support
• Cable Sheath Testing & VLF Testing
• HVAC Commissioning
• Site Managers
• Project Managers

HV Services including Substation Installation & Maintenance

• Mechanical & Electrical Substation Work Up To 400kV
• Installation
• Refurbishment
• Repair
• Alignment & Setting Of Hapam & Alstom Disconnectors & Earth Switches Across The Voltage Range > 400kV
• Project & Site Management
• Project Support & Coordination
• Technical Support
• Civil Works
• Electrical Installation
• Cable Installation
• HV Cable Jointing

Working in partnership with Utility Engineering Solutions. Their design support services include:

• Substation Earthing Design Using CDEGS Earthing Systems Software
• Design Of AIS & GIS Substations
• Specification Of Plant & Equipment up to 400kV
• Protection Studies
• Protection Wiring Schemes
• Fault Level & Load Flow Studies
• Generation Studies
• Point to Point Wiring Schedules
• HV/EHV Cable Network Design
• Terminal Tower Design up to 400kV

Primary Contractor / System Operator Support

What MRR Energy Services offer?

• Full Recruitment Outsourcing
• Full Contractor Management
• Project and Site Management
• Consultancy Services
• Business Development Support
• Substation Installation & Maintenance > 400kV
• Transformer Replacement/ Refurbishment/ Maintenance > 400kV
• Comprehensive Industry Insight & Understanding (gained through past & ongoing endeavours)

◦ Our Inspired Payroll solution takes care of the administrative and financial burden

• Not only will it help with the smooth running of your business but it will also ensure that it is able to reach its full potential

◦ Remove the burden of back office administration with our managed payroll services

• Our online payroll services are simple and easy to use, with our cloud based portal allowing you to effortlessly manage the whole back office process wherever, whenever

◦ Go paperless

• Our online payroll services enable you to manage all documents in the cloud keeping them safe and secure and accessible from anywhere

◦ Payroll management

• Full management of your payroll processing responsibilities for our contractors

◦ Timesheet management

• Process all timesheets, even manual ones, online immediately and seamlessly

Contact MRR

mrrinternational.co.uk

01919172022

[email protected]

LinkedIn Page https://www.linkedin.com/in/mrr-energy-services-107887178

THORNE & DERRICK SPECIALIST ELECTRICAL DISTRIBUTOR

LV ♦ MV ♦ HV

T&D distribute the most extensive range of LV, MV & HV Cable Jointing, Terminating, Pulling & Installation 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.

• Key Products: MV-HV Cable Joints & Terminations, Cable Cleats, Duct Seals, Cable Transits, Underground Cable Protection, Copper Earth Tapes, Cable Jointing Tools, Feeder Pillars, Cable Ducting, Earthing & Lightning Protection, Electrical Safety, Cable Glands, Arc Flash Protection & Fusegear.

• Distributors for: 3M Cold Shrink, ABB, Alroc, Band-It, Catu, Cembre, Centriforce, CMP, Elastimold, Ellis Patents, Emtelle, Furse, Lucy Zodion, Nexans Euromold, Pfisterer, Polypipe, Prysmian, Roxtec.

LV – Low Voltage Cable Joints, Glands, Cleats, Lugs & Accessories (1000 Volts)

MV HV – Medium & High Voltage Cable Joints, Terminations & Connectors (11kV 33kV EHV)

Cable Laying – Underground Cable Covers, Ducting, Seals & Cable Pulling Equipment

T&D, CATU Electrical Safety & Arc Flash Protection Specialists for SAP’s, Linesmen, Jointers & Electrical Engineers – Largest UK Stockist

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.

Pfisterer Connex Cable Plugs – Cable Terminations For MV-HV 33kV Cables

Thorne & Derrick | Distributed from Stock | Approved Supplier 

• ---

  uploaded by: Chris Dodds Thorne & Derrick Sales Marketing Manager

Cable Fittings For

Medium Voltage Networks

The range of Pfisterer cable plugs, joints, terminations fittings and accessories offers solutions for virtually all MV & HV Cable Connection applications – Pfisterer accessories use silicone as an insulating medium due to the excellent properties that it possesses.

Pfisterer MV Cable Accessories

The following Video provides an overview of the Installation Procedure for CONNEX Connectors for the termination of Medium/High Voltage (MV-HV) Cables manufactured by Pfisterer and stocked by Thorne & Derrick – should you require specification support, technical guidance or Jointer training services please call us to discuss.

Pfisterer MV Connex

Dry, Separable Connector System

The MV-Connex cable termination system has a fully insulated metal housing with touch proof properties, maintenance free and suitable for use outdoors, offshore and is waterproof for use on medium/high voltage cable systems.

MV-CONNEX products for medium voltage systems are supplied in a wide range of variations – this includes traditional plug and socket combinations, multiple sockets, bus-bar connectors, surge arresters and voltage detecting systems.

The MV Connex range manufactured by Pfisterer is ideal for use in ring main units, high-voltage motors, circuit-breaker switchgear, transformers, capacitors, transducers and sealing boxes. The inner cone plugs are suitable for use on all types of insulated plastic cables including XLPE and EPR and as well as the standard range of plugs, there is also customer specific versions for most medium/high voltage cable types.

Pfisterer MV Connex Plug

There are many advantages of using the Pfisterer MV-Connex cable termination system.

These include:

• A touch proof, fully insulated enclosure
• No liquid insulating medium
• Soil proof and maintenance free cable termination
• Protection class IP68 and up to 11kV (E Exe Hazardous Areas)
• Thorough transformer and GIS (Gas Insulated Switchgear) testing by manufacturer
• Metal enclosed and no need to open the cable termination at the installation site

Silicone

The Key Material In MV Electrical Engineering

Silicone rubber is the perfect material for MV cable terminations. This is down to the resistance to water, grease, oil and dirt as well as the shock resistance that silicone provides.

When used as a stress relief device in sealed applications, silicone evens out temperature variations and unevenness in the cable surface.

Silicone also avoids potentially dangerous partial discharges caused by air gaps.

Pfisterer MV-Connex Cable Termination System Cross Section

The MV-Connex cable termination system is constructed of four areas: Contact system, Insulating and Field-control, Housing and Bushing. The contact system comprises of a contact ring, tension cone and thrust piece.

The Housing consists of a bell flange, pressure sleeve and spring, heat shrink, test lead and a cable screen. The bushing section of the connector consists of a female contact part, insulating bushing and housing.

Continuous Voltage Indicator for Enclosed Equipment

Voltage detection systems that detect indicate the presence of voltage without directly contacting live parts are becoming ever more important due to increasing use of enclosed switchgear. The principle of the DSA continuous voltage indicator that was developed by Pfisterer has become a standard.

In line with the trend towards integrated systems Pfisterer have incorporated these plug-in display devices in the compact DSA-i3 system.

Pfisterer Connex Plugs (33kV Separable Connectors Size 3)

Complete range of Pfisterer tools are available for use by Jointers to enable the installation of MV-Connex inner cone plug cable terminations:

Further Reading

Electrical Safety – Arc Flash Accidents & Electrocution In LV-HV Installations

Cable Joints – Your Cable Circuit Is Only As Strong As Its Weakest Link …

See also Surge Diverters | Sheath Voltage Limiters

THORNE & DERRICK SPECIALIST ELECTRICAL DISTRIBUTOR

LV ♦ MV ♦ HV

T&D distribute the most extensive range of LV, MV & HV Cable Jointing, Terminating, Pulling & Installation 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.

• Key Products: MV-HV Cable Joints & Terminations, Cable Cleats, Duct Seals, Cable Transits, Underground Cable Protection, Cable Jointing Tools, Feeder Pillars, Cable Ducting, Earthing & Lightning Protection, Electrical Safety, Cable Glands, Arc Flash Protection & Fusegear.

• Distributors for: 3M, ABB, Alroc, Band-It, Catu, Cembre, Centriforce, CMP, Elastimold, Ellis Patents, Emtelle, Furse, Lucy Zodion, Nexans Euromold, Pfisterer, Polypipe, Prysmian, Roxtec.

LV – Low Voltage Cable Joints, Glands, Cleats, Lugs & Accessories (1000 Volts)

MV HV – Medium & High Voltage Cable Joints, Terminations & Connectors (11kV 33kV EHV)

Cable Laying – Underground Cable Covers, Ducting, Seals & Cable Pulling Equipment

T&D, CATU Electrical Safety & Arc Flash Protection Specialists for SAP’s, Linesmen, Jointers & Electrical Engineers – Largest UK Stockist

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.

Severe Defects Missed By Tangent Delta Testing – read how IMCORP”s Factory Grade® Technology can help cable owners pinpoint these problems

Tangent Delta Tests

Guest Article: IMCORP by Ben Lanz & Dr. Wayne Chatterton 

uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager

A utility client requested IMCORP to proactively assess their cables in a downtown area feeding a convention center. A nationally televised event was coming to town so naturally the reliability of the downtown power grid and avoiding an image-damaging power outage was of utmost importance.

The IMCORP Factory Grade® technology provided a meter-by-meter profile and pinpointed many issues with the cable systems feeding the convention center. The utility was surprised with how many components did not meet the cable and accessory manufacturers’ minimum performance standards. While the utility was greatly concerned and intended to make repairs prior to the upcoming event, they decided to get a second opinion with a different type of test called a VLF tan delta (tangent delta, TD) test.

Full article: ➡  Read more here………..

IMCORP

The Cable Experts | Medium & High Voltage Power Cable Systems

IMCORP is the technology leader in Medium & High Voltage Power Cable Systems life cycle condition assessment and performance – IMCORP have been helping their clients achieve maximum cable reliability for more than 20 years and have assessed over 130,000 5kV to 500kV cable systems spanning in excess of 160 million feet.

IMCORP Precision Reliability^TM approach integrates asset condition intelligence into optimized work management processes to maximize cable system reliability at the lowest possible life cycle cost.

Thorne & Derrick have curated this Twitter Moment to recognise the Global Cable Expert status of IMCORP – we are both honoured and humbled to be able to share our expertise and networks effectively to communicate our message to the broadest audience achievable.

Click the Tweet links for deeper reading.

Top 10 Tweets

1. Misplaced Stress Relief Exposing Semicon Screen Cutback On Cold Shrink Terminations
2. Identifying Substandard Performance Of Premolded Dead Front MV Tee-Connectors
3. Power System – Feeder Cable Joint Failures Leads To Jointing Instruction Improvement
4. Identifying Workmanship Installation & Cable Joint Issues At A Solar Site
5. Failing Cable Joints Caused By Poor MV HV Cable Preparation Of Semicon Screen
6. How Do HV Cables Fail – 10 Defects Causing High Voltage Power Cable Outages
7. Failing Cable Joints – Partial Discharge (PD), High Voltage Stress & Cable Joints
8. Improper Stress Control Installation On Medium & High Voltage Power Cables & Systems
9. Power Cable Damage From Backfill – Medium Voltage Cable Case Study
10. Medium Voltage Cable Termination Suffers Partial Discharge (PD) – Cause & Remedy

MV HV Power Cable System Reliability Solutions by IMCORP

 💡 Read our Guest Blog with IMCORP  ➡

The Semicon Screen – A Most Critical Point In Any MV Joint, Termination Or Connector

Thorne & Derrick

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.

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