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11kV Cable Terminations – HV Switchgear Substation Installation & Commission
December 7th, 2017
- Project Scope: 11kV Cable Terminations, Switchgear, Transformers – LV HV Cables
- Featured Contractor:Â ISS Industrial Switchgear Services Ltd
- Cable Specification: 11kV 3 Core XLPEÂ Cable BS6622 IEC60502-2
- Switchgear Type: Air Insulated 11kV High Voltage Switchgear Siemens NXAIR
- Credit: Peter McKenna (Operations Manager) & John Bower (Manager & 33kV SAP)
- All Images Courtesy:Â ISS Industrial Switchgear Services Ltd
11kV Terminations
ISS were contracted to carry out the Design, Build & Installation of 10 new low voltage switchboards and a 24 panel 11kV high voltage switchboard, cabling and terminations installation.
The high voltage cables were connected using 11kV cable terminations into Siemens NX air insulated switchgear – the armoured 3 core 11kV cables with polymeric insulation (XLPE) were glanded using top-hat type cable glands and terminated into the switchgear using 11kV indoor heat shrink cable terminations.
Careful selection of the correct cable lugs are required – 11kV lugs tested to relevant international standards should be used with extended barrels for excellent connection and circuit conductivity.
The 11kV cable containment design and erection shown in the image below was carried out by ISS – 11kV cable spacings and cable cleat ratings were calculated and correctly specified by ISS to protect and restrain the high voltage cable circuits in the event of a short circuit.
ISS design engineers created and installed a bespoke A frame arrangement located on the ground floor to support the bottom cable entry of 11kV cables into the switchgear units located on the first floor.
A total of 22 new 11kV/415V high voltage transformers manufactured by Wilson Power Solutions were installed by ISS and all associated new low voltage (LV) power supply cables.
The LV cables were BS5467 type single core XLPE insulated power cables with aluminium wire armour and stranded copper conductors, 300-500sqmm.
High Voltage Cable Chamber – showing 11kV high voltage switchgear, terminations, cable cleats and containment
HV Switchgear – Siemens NXAIR Air Insulated Switchgear
Siemens NXAIR circuit-breaker switchgear is used in medium/high voltage transformer and switching substations up to 24kVÂ for primary electricity distribution.
All HV switchgear from the Siemens NXAIR air-insulated range are approved with internal arc classification IAC A FLR, loss of service continuity category LSC 2B and partition class PM.
Some features of the high voltage switchgear include:
1 As an electrical insulating medium – air is always available
2 Type-tested HV switchgear according to IEC 62271-200 or VDE 0671-200
3 Use of standardised block-type current transformers
4 450,000+ air-insulated switchgear panels of Siemens in operation worldwide
5 Uses maintenance-free high voltage vacuum circuit-breakers or contactors
6 Testing of the vacuum circuit-breaker and make-proof earthing switch in switchgear panel
7 Pressure-resistant partitions
8 Flexibility regarding the low-voltage equipment (removable compartment, plug-in wires)
9 Quality assurance in accordance with DIN EN ISO 9001
11kV 24kV Air Insulated High Voltage Switchgear – Siemens NXAIR
Industrial Switchgear Services
ISS Ltd are a HV/LV Power Engineering company operating nationwide, undertaking Turnkey Electrical Distribution Projects and Site Service activities including installation, commissioning, pre-commissioning, final commissioning, HV/LV switching, maintenance, repairs, refurbishment of HV/LV AC & DC Switchgear, power transformers, SCADA systems, control panels, HV/LV cabling, cable terminations and associated ancillary equipment.
ISS Ltd manufacture low and high voltage switchgear, protection cubicles, LV generator changeover panels, marshalling cabinets and bespoke protection and control equipment.
- HV Switchgear & Cable Terminations 11kV 33kV
- LV Switchgear & Cable Gland Terminations
- Transformer & Rectifiers
- Substation Construction 11kV 33kV
- Protection & Control
22kV Rail Cable Installation
“ISS have completed further 22kV high voltage protection upgrades, upgrading 5 circuits at this particular site, all communicating back to a new 22kV switchboard installed a few miles away on the cable network. ISS removed the existing MBCI Translay, MCRI Overcurrent, MRTP Pilot Wire Supervision, KCEG Directional Overcurrent/Earth Fault MVTW Destabilising Relays. These have been replaced with a new Line Differential ABB RED615 Relay and Modem and Agile P14D Back Up Protection Relays.”
“New multicore cables have been installed from the switchboard back to the Marshalling cubicle, with ISS successfully proving the SCADA signals back to the RTU and control room. ISS commissioned the circuit into service, carrying out On Load Line Diff stability checks. A great team effort, from the design and manufacture of the protection fascia’s from our Manchester HQ, to the installation and commissioning of the circuits for a London based rail network. Great collaborative interfacing and planning between everyone involved to upgrade 22kV cable circuits on an operational railway” – Peter McKenna (ISS Operations Manager).Â
22kV Rail Cable Installation
More ISS project information:
Commissioning 25kV AIS Switchgear On Containerised Rail Traction HV High Voltage Substations
Flood Defence & Replacement Of Low & High Voltage
11kV Switchgear & Cables
The disaster recovery project involved the replacement of water damaged high voltage electrical equipment and cables – this included replacement of primary high voltage switchgear, cable terminations, associated power transformers and distribution cables.
Watch, listen and learn more about the project:
Should you require any further information about 11kV Cable Termination, Switchgear, Substation & High Voltage services provided by ISSÂ please call 0161 344 1117.
Copper Earthing Tape & Rods Protecting 33kV Substation & Transformer Bund
December 6th, 2017- Application: Using Copper Earthing Tapes, Rods & CADWELD To Earth 33kV Substation, Switchgear & Transformer
- Contractor: Power Jointing Services Ltd (Hampshire UK)Â Â
- Image Courtesy: Robert Coleman LV HV Cable Jointer at Power Jointing Services Ltd
- Featured Product: Earthing & Lightning Protection MV HV
Copper Earthing Tapes & Earth Rods
33kV substation earthing is provided around the transformer bund and new building structure using copper earthing tapes, electrode rods and exothermic welding (CADWELDing) of the earth rods to tape – 50mm x 4mm earth tapes are installed as a ring and cross earthing design with 40mm x 4mm copper tape braised for additional stairs and walkway earthing.
The 33kV switchgear housing within the high voltage substation is earthed and bonded to a new transformer ring and Neutral Earth Resistors (NER). The copper tapes and earthing cables are shown connected to the 10 way earth bar. To achieve the required earth resistivity reading 3 x 1.2 metre length coupled copper earth rods were driven into the ground.
Driven earth rods are used to exploit lower resistivity ground conditions where present to reduce the earth potential rise (EPR) on substation earthing and lightning protection projects from 11kV/33kV up to 400kV.
Substation Earthing
Earthing of low, medium and high voltage electrical networks is critical to ensure safe and correct operation preventing and minimising against the consequences of a direct lightning strike to equipment and buswork within substations. UK DNO’s publish primary and secondary substation earthing designs for the application of earthing systems to HV and LV underground cables and overhead line networks, typically operating at 33kV, 20kV, 11kV, 6.6kV, 3kV and 2kV.
Similarly, the National Grid publish an Earthing Technical Specification for the lightning protection of transmission and distribution systems located in the busbar protection zone of the electricity grid operating at nominal voltages of 400kV, 275kV 132kV and 66kV. The general requirements of the substation earthing systems are compliance with technical standard EA TS 41-24 and British Standards BS EN 50522 and BS7430.
âž¡ Read our Blog about Substation Earthing
Earthing Standards
- Energy Network Association (ENA) Technical Standard (TS) 41-24 (Substation Earthing) – the standard provides guidelines for the design, installation, testing and maintenance of main earthing systems in substations
- BS EN 50522:2010 – the British Standard provides guidance for Earthing of Power Installations Exceeding 1kV a.c
- BS 7430:2011+A1:2015 – the British Standard is a code of practice for Protective Earthing of Electrical Installations
Copper Earth Tape – the earthing tape 40mm x 4mm shown bonding to the existing medium/high voltage substation earth bar
Copper Earth Tape Dropper – 50mm x 4mm earth tape is shown earthing switch 1 of 3 on the 33kV distribution board
Earth Tapes – the 50mm x 4mm copper tapes are routed back to the rebar earths on the earth bar
Transformer Earthing – using 40mm x 4mm copper earthing tape on the 33kV high voltage transformer
Power Jointing Services Ltd
Power Jointing Services Ltd established in 2007 specialising in 33kV-400V electrical network construction, establishing industrial and commercial supplies, installing residential service connections and street lighting connections. Also: High voltage service alterations, cable fault finding and replacement of assets including transformers, low voltage distribution boards and link boxes.
Copper Earthing Tapes & Products
T&D provide competitive prices and fast delivery from stock for Earthing & Lightning Protection products including copper tapes, rods, electrodes, earth bars and ancillary items for low, medium and high voltage substations.
♦ Visit Substation Earthing for further information.
Thorne & Derrick Specialist Electrical Distributor
LVÂ ♦ MVÂ ♦ HV
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.
- Key Products: MV-HV Cable Joints & Terminations, Cable Cleats, Duct Seals, Cable Transits, Exothermic Welding, Underground Cable Protection, Cable Jointing Tools, Feeder Pillars, Cable Ducting, Earth Tapes, 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
More…
T&D’s Power Blog covers: LV MV HV & EHV Transmission & Distribution, Substations, Switchgear, Cable Jointing & Termination, Cable Fault & Repair, Underground Cables.
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Substation Earthing
December 5th, 2017
Images: ABB
by Chris Dodds T&D - estimated reading time 6 minutes
Earthing Substations
Thorne & Derrick International are distributors for the ABB Furse and AN Wallis range of Earthing & Lightning Protection Systems – this includes earth rods, earth bars, earth tapes and a full supporting range of accessories to comprise the complete earthing system for electricity transmission and distribution systems.
The copper products are used typically to provide electricity substation earthing to medium/high voltage grids containing electrical infrastructure, cables, switchgear and transformers. Furthermore, it is usual for all exposed and normally un-energised metalwork inside the substation perimeter, including doors, staircases, ventilation ducts, cable supports etc to be be bonded to the main earth grid to avoid any potential differences between different items of metalwork.
Guidelines and policies vary according to the Distribution Network Operator – specialist contractors using modern earthing techniques compliant with relevant British and international standards, including BS 7430:2011+A1:2015 Code of Practice For Earthing and IEEE80-2000 Guide for Safety in AC Substation Grounding should be employed to calculate specific substation earthing requirements.
A final design of the earthing system can only be undertaken when sufficient knowledge is available of the proposed physical and electrical requirements of the substation – as an absolute minimum the earthing system desginer must have knowledge of:
- value of fault current and supply arrangements (overhead and/or underground cable)
- fault duration (or protection settings)
- soil resistivity
- substation dimensions
The specification for fixed earthing systems within EHV, HV, HV/MV and LV substations also applied to terminal towers adjacent to substations and cable sealing end compounds, pole mounted transformer or air-break switch disconnector installations and pole mounted reclosers with ground level control.
âž¡ View our complete range of Substation Earthing products including substation and overhead line earth clamps, telescopic sticks and portable earthing kits – see also Exothermic Welding.
Full range of bare copper, printed and covered earth tapes are available
Copper Earthing Products
Example – Substation Earthing 11kV. Image:Â SPE Electrical Ltd
For MV & HV Substations
Earthing products and systems can be supplied by T&D for all substation voltages:
- MV Medium Voltage 11kV 33kV
- High Voltage 66kV 132kV
- Extra High Voltage EHV 275kV 400kVÂ
T&D provide expert technical support, competitive prices and delivery from stock for substation earthing projects – all earthing products are available to meet the design criteria and construction specification of the earthing systems for substations and equipment for 33kV and 132kV substations.
This include copper earth tapes with typical dimensions 32mm x 4, 40mm x 6mm, 50mm x 4mm and 50mm x 6mm.
With respect to high voltage earthing applications in the power utility sector the following items would normally be earthed or bonded to the main earth grid:
- Overhead line termination structures including towers, gantries and earthed wood pole structures adjacent to the substation
- Power cable sheaths and armours
- Transformer and reactor banks, cooler and radiators, tap changers, earthing resistors, earthing reactors, high voltage transformer neutral connections
- Metal clad switchgear assemblies and cases, isolators and earth switch bases
- Metal gantries and structures and metalwork mounted on wood structures
- Metallic structures including steel frames (bonded at each corner) rebars and piles
- Panels, cubicles, kiosks, LV AC equipment, lighting and security masts
It is usual for critical items such as medium/high voltage transformer tanks and terminal towers to have duplicate connections to the main earth grid.
11kV Substations
Pictured above is a diagram showing the typical layout of a high voltage GRP electricity substation distributing 11kV power – an outer ring of 70sqmm copper earthing conductor plus 4 earth rods of standard depth are shown with a 10 metre tail in the HV cable trench accompanied by a layout for the concrete rebar. Here, the HV substation is contained within a GRP enclosure with potential touch and step voltage risks.
Earth tapes are available stamped with the UK DNO ownership details to discourage copper metal theft – earth tapes printed “National Grid Property” are also available.
Full range of copperbond earth rods, couplings and driving studs are available for grid and primary substation earthing depending upon the calculated fault level.
- E – Earth electrode (copper earth rod)
- UE – Earth potential rise (EPR)
- S1, S2, S3 – Potential grading earth electrodes connected to the earth electrode E
- US Touch – Source voltage for touching (Touch Voltage)
- US Step – Source voltage for stepping (Step Voltage)
Touch Voltage
The potential on the surface of the soil near a copper earth rod during the time that fault current flows. If a person were to touch a rod (or any exposed metalwork connected to it), then the potential difference experienced between hands and feet is termed the touch voltage. Touch voltages are calculated assuming that the feet of the person are 1 metre away from the metalwork being touched. Touch voltages are normally reduced by using potential grading electrodes.
Step Voltage
Potential differences are established on the surface of the soil whilst fault current is flowing. Step voltage in a particular direction is defined as the potential difference between two points a metre part. Step potentials can be reduced by using potential grading copper electrodes or installation electrodes, such as copper earth rods, at a greater soil depth.
Transfer Potential
A potential rise of an earthing system caused by a current flowing to earth, transferred by means of a connected conductor (eg metallic sheath or pipe), which enters a substation area, with little or no potential rise relative to reference earth, and which is not connected to earth in that area. This results in a potential difference occurring between the conductor and its surroundings at the remote position.
Electrical Safety – Maintaining & Repair Of Earthing Systems
Substation earthing systems are the victim of operational and intentional damage – copper theft is rife and earthing maintenance work is often identified during routine site checks and inspection. Earth faults can be weekly occurrences on primary substations supplying extended high voltage rural overhead line networks. During these maintenance tasks there is serious risk of injury or even fatal electric shock when working on depleted or damaged earthing systems – specialist electrical safety equipment including insulated sticks, poles or rods, portable earth shorting leads, earthing clamps (substation or line-end), insulating footwear (shoes or boots) and insulating gloves depending on the voltage class of the substation earthing system.
T&D distribute a full range CATU Electrical Safety equipment including Arc Flash Kits, Insulating Boots & Safety Shoes and Voltage Detectors
High Voltage Substation Earthing 275kV
All images courtesy: Ian Forster (EHV Site Manager)
More Substation Earthing Applications
Fig.1 3 x Copper earth cables connected to main aluminium substation earth tape
Fig.2 Copper earth tape connected to main aluminium earth tape
Fig.3 Aluminium to aluminium tape connection
View the Earthing Products below for further information and technical details.
3M Scotchcast Cable Joint – Resin & Taped Manhole Cable Splice 600/1000V
December 4th, 2017
- Application: Resin & Taped Manhole Cable Joint / Splice 600/1000V
- Cable Joint: 3M Scotchcast Cable Joints
- Cable Jointer: Andy O’Malley (IBEW 258 EHV Cable Jointer / Cable Splicer)
- Featured Manufacturer: 3M Electrical
Cable Jointing In Confined Spaces
-
by Chris Dodds - Sales & Marketing Manager Thorne & Derrick
Prior to jointing cables in confined spaces control measures and risk assessment must be undertaken. This picture was taken from outside the manhole once the cable joint was complete – the looped cables were spliced using 3M Scotchcast cable joints to effect a repair to damaged cables in a confined space.
Initially the cable jointers bump test their gas detectors then gas sample the manhole with the lid on for the presence of harmful, flammable or toxic gas.
If all is safe to proceed the jointers remove the lid. Next the working space is vented with forced air while the jointers constantly monitor the confined space with their gas detectors. Access to the manhole is via a wooden ladder with the cable jointers wearing a rescue harness – a tripod and winch are positioned and a gate guard around the manhole is erected to prevent trips, falls or accidents.
The cable is jointed within the manhole to prevent overbending strains on the low voltage cable when fed back into the manhole if jointed at ground level – cable duct seals can be used to prevent the migration of flammable gas or flood waters into the manhole.
The 500kcmil 100 volt rated DC cable circuit is operating at 600 volt – the cable joint/splice utilises 3M Scotch Electrical Tapes with no heat shrink or cold shrink tubing.
3M Scotchcast Cable Joint – Resin & Taped Manhole Cable Splice 600/1000V
3M Scotchcast Cable Joint
3M cable joints use Scotchcast resins for the low voltage jointing of cables with XLPE, EPR, PVC or PILC insulation up to 3.3kV. Resin cable joints specially modified with high performance hydrocarbon resistant, low smoke zero halogen, fire resistant and flame retardant resins are available to withstand harsh operating and environmental conditions in industrial and hazardous area locations. The 3M cable joints are specified throughout ther oil, petrochemical, gas, mines, telecoms, rail and industrial cables are available – suitable for direct burial (underground) or exposed onto cable containment.
3M SCOTCHCAST LV RESIN CABLE JOINTS – Benefits
Resin Cable Joints – Features & Benefits Of 3M Scotchcast Cable Jointing Systems
Contact Thorne & Derrick to discuss your application for jointing LV cables – we can provide expert technical support, training and specification advice to ensure the correct supply of electrical LV cable joints to suit industrial and hazardous area location cables.
T&D – Main Distributors For 3M Electrical
Should you require any assistance with the selection or specification of cable joints or terminations using 3M Cold Shrink on MV-HV cables please do not hesitate to contact us.
Thorne & Derrick Specialist Electrical Distributor
LVÂ ♦ MVÂ ♦ HV
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.
- Key Products: MV-HV Cable Joints & Terminations, Cable Cleats, Duct Seals, Cable Transits, Underground Cable Protection, Cable Jointing Tools, Feeder Pillars, Cable Ducting, Earth Tapes, Electrical Safety, Cable Glands, Arc Flash Protection & Fusegear.
- Distributors for: 3M, ABB, Alroc, Band-It, Catu Electrical, 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
More…
T&D’s Power Blog covers: LV MV HV & EHV Transmission & Distribution, Substations, Switchgear, Cable Jointing & Termination, Cable Fault & Repair, Underground Cables.
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11kV Switchgear Cable Terminations, Jointing & Spiking In High Voltage Substations
December 4th, 2017Jointing, Terminating & Installation of 11kV Substation Cables
Guest Post from Mick Beeby - Technical & Operations Manager at UK Power Solutions Ltd
Uploaded by Chris Dodds - Thorne & Derrick Sales & Marketing Manager
“I spent a couple of days on site this week with one of our team of Operations Engineers, connecting 4 new ESP adopted 11kV high voltage substations on Phase 2B of the Ballymore Royal Wharf Development in London.
UKPS have provided the electrical infrastructure for Phase 1, 2A and now 2B to date.
This includes 1 x UKPN 11kV boundary substation with 2 RMUs, 1 x SSE 11kV boundary substation with 2 RMUs, 11 x ESP 11kV permanent distribution substations and 1 x ESP 11kV TBS installed and disconnected again, 1 x UKPN 11kV metered TBS to private high voltage transformer.
There are more ESP 11kV distribution substations to install in Q1 2018. This now takes us to 10 of a final 12 total on this ESP 11kV ring.
An IEC was received from SSE for the DNO/iDNO boundary end of the ESP 11kV circuit, which was made Dead, Isolated and Earthed before the 11kV cables were identified and cables spiked under a Sanction-for-Test. A Permit-to-Work was then issued for the 11kV cable jointing, followed by pressure testing under another Sanction-for-Test and final energisation and 11kV phase checks to bring 4 new 11kV high voltagew substations onto the system.”
1 of 4 new ESP 11kV high voltage substations connected on this visit, taking the total on this ESP 11kV ring to 4 substations, and 11 on the Ballymore Royal Wharf development so far.
2 x 3c 11kV polymeric SSE specification straight cable joints of TE Connectivity MXSU series, to loop 4 high voltage substations into the existing ring of 4, making 8 total.
5 Way Transformer Mounted Cabinet post energisation testing. 5 outgoing LV circuits to the multi-occupancy buildings on Phase 2b of the Royal Wharf development.
1 of the 4 new ESP adopted substation internally, comprising Schneider RN2C SF6 Ring Main Unit, Schneider 11000V/400V transformer and Schneider 5 Way Transformer Mounted Fuse Cabinet with incoming high voltage 3c 11kV XLPE polymeric cables.
About Mick Beeby
With over 25 years of experience in the UK Electricity Distribution sector, coming from an apprentice electrician, through Electrical Fitter, Project Manager and Senior Authorised Person roles. Familiar with many types of low voltage, medium voltage and high voltage switchgear, transformers and cables. In depth familiarity of Schneider Genie Evo 11kV switchgear, switchgear cable terminations including complete stripping, re-build and testing.
In depth theoretical and practical knowledge of MV-HV testing and commissioning, cable fault location and cable repair, including test equipment application and limitation.
Experience of all aspects of medium voltage distribution substation testing and commissioning; cable sheath testing, cable/switchgear IR testing, over voltage testing (DC/AC/VLF), primary and secondary injection testing, transformer testing, CT mag curves, CT polarity, soil resistivity and earth electrode systems testing.
Unlike the Distribution Network Operator, we can design & install your private High Voltage network downstream of your HV metering point, providing a more complete package of works to save you time & money. pic.twitter.com/7GtXGzSefH
— UKPS (@ukpowersolution) November 29, 2017
Schneider
Schneider Genie Evo Air Insulated
MV HV Switchgear 3.3kV 13.8kV
The Schneider GenieEvo concept is an evolution from the extremely successful Genie philosophy which offers increased levels of flexibility and greater choice for the distribution of medium/high voltage power – this is achieved by allowing separate selection of the MV-HV switchgear and protection and control modules. GenieEvo extends the concept of Genie by offering a gas free circuit breaker to the MV-HV product portfolio.
- Schneider GenieEvo comprises
Cast resin encapsulated MV medium voltage system
Demountable vacuum circuit breaker
Controlled air, resin encapsulated series disconnector
Flexible pre-engineered protection and control modules
 1. Vacuum circuit breaker 2. Controlled air disconnector 3. Top entry pilot box 4. Internal arc protection 5. CT chamber 6. Cast resin insulated busbar system with optional earth shielding 7. Multi functional protection and control unit 8. Unit fascia with active operating mimic display 9. Front access cable and vacuum test facility 10. Rear entry MV medium voltage cable box 11. Internal arc vented via dedicated cable trunking for operator safety 12. Mechanical operations counter 13. Circuit potential indicator as standard 14. VT chamber
Medium & High Voltage Switchgear
Thorne & Derrick International
T&D distribute the most extensive range of MV & HV 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.
- Key Products: MV-HV Cable Joints & Terminations, Cable Cleats, Sealing Cable Ducts, Cable Transits, Underground Cable Protection, Cable Jointing Tools, Feeder Pillars, Cable Ducting, Copper Earthing, 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.
Switchgear Cable Terminations
T&D distribute MV-HV Switchgear Cable Terminations to suit 11kV/33kV connections into air, oil and gas insulated switchgear or transformers including heat shrink, cold shrink and separable connectors for both inner cone and outer cone bushings from leading manufacturers including Nexans Euromold, 3M and Pfisterer.
♦ See more: Heat Shrink Cable Terminations 11kV 33kV | Cold Shrink Cable Terminations 11kV 33KV
MV HV – Medium & High Voltage Cable Joints, Terminations & Connectors (11kV 33kV EHV)
More…
T&D’s Power Blog covers: LV MV HV & EHV Transmission & Distribution, Substations, Switchgear, Cable Jointing & Termination, Cable Fault & Repair, Underground Cables.
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