Thorne & Derrick distribute HV Cable Terminations & Connectors to suit single and 3 core medium/high voltage cables with XLPE, EPR or PILC insulation operating up to 33kV – UK DNO approved equipment from manufacturers including Nexans Euromold, 3M Cold Shrink and Pfisterer CONNEX for cable termination connections into air, oil or gas insulated switchgear, transformers and cable end-boxes are available from stock.
33kV cable terminations are complete with components including screen earth kit (copper taped screen cables), screen wire earth lugs (copper wire screened cables) cable glands (bolt-on, compression or heat shrink type for armoured/non-armoured cables), insulating bushing boots and either 33kV crimp lugs or mechanical shearbolt cable lugs.
Outdoor cable terminations are available to terminate and connect 33kV cables onto medium or high voltage electrical equipment including pole-top mounted brackets for overhead line distribution networks.
ABB SafePlus is a compact, metal enclosed SF6-insulated medium voltage (MV) switchgear system for secondary distribution applications up to 33kV/36kV. The switchgear has a unique flexibility due to its extendability and the possible combination of fully modular and semi-modular configurations of medium voltage electrical equipment.
Typical applications for ABB SafePlus Medium Voltage switchgear include: compact secondary substations (CSS), light industry, wind and solar farms, buildings, generation, mining, airports and railways.
SafePlus medium/high voltage switchgear is equipped with cable bushings outer or outside cone type which comply with CENELEC EN 50181 Interface B (400 Series Plug-in) or Interface C (400 Series Bolted).
Cable terminations of the following types are recommended: Euromold / Elastimold, Tyco Electronics, nkt-cables, Prysmian, Südkabel or ABB Kabeldon.
In the following site photograph from a wind farm project the 33kV power cable to BS7870/4.1 specification has been connected into the SF6 gas insulated switchgear with Interface C type bushings using screened separable connectors.
Low Voltage (LV) and Medium Voltage (MV) polymeric insulated cables manufactured in accordance with British Standard BS7870 for use by distribution and generation utilities – covering LV and HV cables for the provision of an electricity supply from a distribution main. This British Standard applies to concentric, split concentric cables and power cables for fixed installations up to and including 33kV.
Thorne & Derrick distribute HV Cable Terminations for 6.6kV 11kV 33kV high voltage cables – we also provide competitive prices for indoor and outdoor heat shrink terminations for HV cables from extensive stocks to UK and international destinations.
Should you require any assistance with the selection or specification of heat shrink terminations to suit 33kV high voltage power cables please do not hesitate to contatct us.
T&D distribute the most extensive range of MV & HV Cable Joints & Terminations, Cable Installation Accessories & Cable Pulling Equipment – we service UK and international clients working on underground cables, overhead lines, substation earthing and electrical construction at LV, 11kV, 33kV and EHV transmission and distribution voltages.
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’s Power Blog covers: LV MV HV & EHV Transmission & Distribution, Substation Earthing, Switchgear, Cable Jointing & Termination, Cable Fault & Repair, Underground Cables.
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Siemens – Gas Insulated Switchgear For Secondary Distribution MV Medium Voltage Power Systems Up To 33kV
by Chris Dodds T&D - estimated reading time 5 minutes
Thorne & Derrick International, based in the UK, are a leading distributor of cable accessories and connection systems for 33kV cables – this includes heat shrink/cold shrink joints, terminations and EPDM type screened separable connectors manufactured by Nexans Euromold.
The following information enables the specification and selection of the correct 33kV cable plug type termination or connector to suit medium/high voltage power cables used with Siemens NXPLUS C Wind switchgear.
Specifically, we confirm the current approved 33kV cable connectors for use with Interface C 33kV Bushings on gas insulated switchgear.
The following information table enables the selection and outlines the possible cable connection types (T-Plugs, Coupling Insert & Screened Separable Connectors) and MV surge arresters compatible with Siemens NXPLUS C Wind switchgear 33kV/36kV.
Screened cable T-plugs, also known as separable connectors, are specified to terminate and connect 33kV power cables into Siemens NXPLUS C gas insulated switchgear – the external semi-conductive layer must be earthed normally via a cable connector.
Insulated cable T-plugs (without semi-conductive layer) are not permissible – this type of MV cable plug or connector is prone to partial discharge due to the proximity to earthed parts of the switchgear. Partial discharge destroys the MV cable connector causing an arc between phase and earth.
The connection of conventional 33kV cable sealing ends or terminations via elbow adapters is not permissible either as this type of medium voltage power system is also insulated but not screened (no external semi-conductive layer).
| Circuit-breaker Panels 630 A / 800 A 33kV/36kV | ||||||||
| Number Of Cables Per Panel & Phase | Connector Manufacturer | Rated voltage | Conductor Cross- Section sqmm | Cable Insulation | T-Plugs/Phase Bolted | Coupling Inserts/ Coupling Plugs / Bolted | Surge Arresters With Coupling Arresters/Phase | Inserts Coupling Unit |
| 1 | Nexans Euromold | 36kV | 50 to 240 | EPDM | 1x M400TB/G | – | 1x 400PB-5(10)SA-xxx | – |
| 36kV | 50 to 240 | EPDM | 1x M430TB/G | – | 1x 300SA-10-xx | – | ||
| 36kV | 50 to 630 | EPDM | 1x M484TB/G | – | 1x 800SA-10-xx | – | ||
| 36kV | 300 to 630 | EPDM | 1x M440TB/G | – | 1x 400PB-5(10)SA-xxx | – | ||
| Südkabel | 36kV | 70 to 300 | Silicone | 1x SET 36 | – | – | – | |
| 36kV | 70 to 500 | Silicone | 1x SEHT 33 | – | 1x MUT 33 | 1x KU 33 | ||
| nkt Cables | 36kV | 25 to 300 | Silicone | 1x CB 36-630 | – | 1x CSA36-10 | – | |
| 36kV | 400 to 630 | Silicone | 1x CB 36-630(1250) | – | 1x CSA36-10 | – | ||
| Tyco Electronics Raychem | 36kV | 25 to 300 | Silicone | 1x RSTI-66xx | – | 1x RSTI-CC-66SAxxx | – | |
| 36kV | 25 to 300 | Silicone | 1x RSTI-68xx | – | – | – | ||
| 36kV | 400 to 630 | Silicone | 1x RSTI-66Lxx | – | 1x RSTI-66SAxxx | 1x RSTIÂ66CP-M16 | ||
| 36kV | 400 to 800 | Silicone | 1x RSTI-69xx | – | – | – | ||
| 2 | Nexans Euromold | 36kV | 50 to 240 | EPDM | 2x M400TB/G | 1x M400CP | – | – |
| 36kV | 50 to 240 | EPDM | 1x M430TB/G | 1x M300PBM-630A | 1x 300SA-10-xx | – | ||
| 36kV | 50 to 360 | EPDM | 1x M484TB/G | 1x M804PB/G | – | – | ||
| 36kV | 300 to 630 | EPDM | 2x M440TB/G | 1x M400CP | – | – | ||
| Südkabel | 36kV | 70 to 500 | Silicone | 2x SEHT 33 | 1x KU 33 | – | – | |
| nkt cables | 36kV | 25 to 300 | Silicone | 1x CB 36-630 | 1x CC36-630 | 1x CSA36-10 | – | |
| 36kV | 25 to 300 | Silicone | 2x CB 36-630 | 1x CP 630C | – | – | ||
| 36kV | 400 to 630 | Silicone | 2x CB 36-630(1250) | 1x CC36-630(1250) | 1x CSA36-10 | – | ||
| 36kV | 400 to 630 | Silicone | 2x CB 36-630(1250) | 1x CP 630C | – | – | ||
| Tyco Electronics Raychem | 36kV | 25 to 300 | Silicone | 1x RSTI-66xx | 1x RSTI-CC-66xx | – | – | |
| 36kV | 25 to 300 | Silicone | 1x RSTI-68xx | 1x RSTI-CC-68xx | – | – | ||
| 36kV | 400 to 630 | Silicone | 2x RSTI-66Lxx | 1x RSTI-66CP-M16 | – | – | ||
| 36kV | 400 to 800 | Silicone | 1x RSTI-69xx | 1x RSTI-CC-69xx | – | – | ||
1) Observe the actual short-circuit and current carrying capacity of the cables and sealing ends
| Disconnector Panel 630 A / 800 A, ring-main panel 630 AÂ 33kV/36kV | ||||||||
| Number Of Cables Per Panel & Phase | Connector Manufacturer | Rated Voltage | Conductor Cross- Section sqmm | Cable Insulation | T-Plugs / Phase / Bolted | Coupling Inserts/ Coupling Plugs / Bolted | Surge Arresters With Coupling Arresters / Phase | Inserts Coupling Unit |
| 1 | Nexans Euromold | 36kV | 50 to 240 | EPDM | 1x M400TB/G | – | 1x 400PB 5(10) SA-xxx | – |
| 36kV | 50 to 240 | EPDM | 1x M430TB/G | – | 1x 300SA-10-xx | – | ||
| 36kV | 50 to 630 | EPDM | 1x M484TB/G | – | 1x 800SA-10-xx | – | ||
| 36kV | 300 to 630 | EPDM | 1x M440TB/G | – | 1x 400PB 5(10) SA-xxx | – | ||
| Südkabel | 36kV | 70 to 500 | Silicone | 1x SET 36 | – | – | – | |
| 36kV | 70 to 500 | Silicone | 1x SEHT 33 | – | 1x MUT33 | 1x KU33 | ||
| nkt Cables | 36kV | 25 to 300 | Silicone | 1x CB36-630 | – | 1x CSA36-10 | – | |
| 36kV | 400 to 630 | Silicone | 1x CB36-630(1250) | – | 1x CSA36-10 | – | ||
| Tyco Electronics Raychem | 36kV | 25 to 300 | Silicone | 1x RSTI-66xx | – | 1x RSTI-CC-66SAxxx | – | |
| 36kV | 25 to 300 | Silicone | 1x RSTI-68xx | – | – | – | ||
| 36kV | 400 to 630 | Silicone | 1x RSTI-66Lxx | – | 1x RSTI-CC-66SAxxx | 1x RSTI-66CPÂM16 | ||
| 36kV | 400 to 800 | Silicone | 1x RSTI-69xx | – | – | – | ||
| 2 | Nexans Euromold | 36kV | 50 to 240 | EPDM | 2x M400TB/G | 1x M400CP | – | – |
| 36kV | 50 to 240 | EPDM | 1x M430TB/G | 1x M300PB/G | – | – | ||
| 36kV | 50 to 630 | EPDM | 1x M484TBG | 1x M804PB/G | 1x 800SA-10-xx | – | ||
| 36kV | 300 to 630 | EPDM | 2x M440TB/G | 1x M400CP | – | – | ||
| Südkabel | 36kV | 70 to 500 | Silicone | 2x SEHT 33 | 1x KU33 | – | – | |
| nkt Cables | 36kV | 25 to 300 | Silicone | 1x CB36-630 | 1x CC36-630 | 1x CSA36-10 | – | |
| 36kV | 25 to 300 | Silicone | 2x CB36-630 | 1x CP-630C | 1x CSA36-10 | – | ||
| 36kV | 400 to 630 | Silicone | 1x CB36-630(1250) | 1x CC36-630(1250) | 1x CSA36-10 | – | ||
| 36kV | 400 to 630 | Silicone | 2x CB36-630(1250) | 1x CP-630C | – | – | ||
| Tyco Electronics Raychem | 36kV | 25 to 300 | Silicone | 1x RSTI-66xx | 1x RSTI-CC-66xx | 1x RSTI-CC-66SAxxx | – | |
| 36kV | 25 to 300 | Silicone | 1x RSTI-68xx | 1x RSTI-CC-68xx | – | – | ||
| 36kV | 400 to 630 | Silicone | 2x RSTI-66Lxx | 1x RSTI-66CP-M16 | 1x RSTI-CC-66SAxxx | 1x RSTI-66CPÂM16 | ||
| 36kV | 400 to 800 | Silicone | 1x RSTI-69xx | 1x RSTI-CC-69xx | – | – | ||
| 3 | Nexans Euromold | 36kV | 50 to 240 | EPDM | 1x M430TB/G | 1x M300PBM- 630A | – | – |
| nkt Cables | 36kV | 25 to 300 | Silicone | 1x CB36-630 | 2x CC36-630 | – | – | |
| 36kV | 2x CP-630C | – | – | |||||
| 36kV | 400 to 630 | Silicone | 1x CB 36-630(1250) | 2x CC36-630(1250) | – | – | ||
| 36kV | 400 to 630 | Silicone | 2x CB 36-630(1250) | 1x CP-630C | – | – | ||
| Tyco Electronics Raychem | 36kV | 25 to 300 | Silicone | 1x RSTI-66xx | 2x RSTI-CC-66xx | – | – | |
| 36kV | 25 to 300 | Silicone | 1x RSTI-68xx | 2x RSTI-CC-68xx | – | – | ||
| 36kV | 400 to 630 | Silicone | 3x RSTI-66Lxx | 2x RSTI-66CP-M16 | – | – | ||
| 36kV | 400 to 800 | Silicone | 1x RSTI-69xx | 2x RSTI-CC-69xx | – | – | ||
1) Observe the actual short-circuit and current carrying capacity of the cables and sealing endsÂ
The following table outlines the screened separable connector, also referred to as cable sealing ends, suitable for 33kV/36kV cables according to IEC 60502-2 and VDE 0276-620.
The cable T-plug connection types are suitable for medium voltage bushings with outside cone as Interface C Type Bushings according to EN50181 for 33kV cables with conductor cross-section up to 800sqmm copper/aluminium.
| Cable Type 33kV/36kV | Connector Manufacturer | 33kV Cable Connector Type | Cross-Section sqmm | Comment |
| 1-core cable, PE and XLPE- insulatedN2YSY (Cu) and N2XSY (Cu) orNA2YSY (Al) and NA2XSY (Al) | Nexans Euromold | M400TB/G | 50 to 240 | EPDM with semi-conductive layer |
| M430TB/G | 50 to 240 | EPDM with semi-conductive layer | ||
| M484TB/G | 70 to 630 | EPDM with semi-conductive layer | ||
| M440 TB/G | 300 to 630 | EPDM with semi-conductive layer | ||
| nkt cables | CB 36-630 | 25 to 300 | Silicone with semi-conductive layer (optionally with metal housing) | |
| CB 36-630(1250) | 400 to 630 | Silicone with semi-conductive layer (optionally with metal housing) | ||
| Südkabel | SEHDT 33 | 70 to 500 | Silicone with semi-conductive layer (optionally with metal housing) | |
| Tyco Electronics Raychem | RSTI-66xx | 25 to 240 | Silicone with semi-conductive layer, with capacitive measuring point | |
| RSTI-68xx | 25 to 240 | Silicone with semi-conductive layer, with capacitive measuring point | ||
| RSTI-66Lxx | 400 to 630 | Silicone with semi-conductive layer, with capacitive measuring point | ||
| RSTI-69xx | 400 to 800 | Silicone with semi-conductive layer, with capacitive measuring point |
N2XSY XLPE PVC – 18/30 (36)kV Cable Connectors
Surge arresters for pluggable onto cable T-plugs and are recommened for MV-HV cable and power systems:
| Surge Arrester 33kV/36kV | 1 Cable Per Phase | 2 Cables Per Phase | ||||
| Circuit-breaker Panel | Disconnector Panel | Ring-main Panel | Circuit-breaker Panel | Disconnector Panel | Ring-main Panel | |
| Nexans Euromold 400PB-10-SA-45L | X | X | X | – | – | – |
| Nexans Euromold 300SA-10-xx | X | X | X | X | X | X |
| Südkabel MUT 33 + KU 33 | – * | X | X | – | – | – |
| nkt Cables CSA 36-10 | X | X | X | X** | X | X |
| Tyco Electronics Raychem RSTI-CC-66SAxxx | –* | X | X | –* | X | X |
| Tyco Electronics Raychem RSTI-66SAxxx | –* | X | X | –* | X | X |
* protrudes into the floor area; possible depending on the local conditions, e.g. with sufficient hole depth
** depending on the cable plug type – contact T&D to discuss possible combinations of cable connection types and surge arresters in NXPLUS C Wind up to 36kV.
âž¡ View complete range of Surge Arresters 11kV 33kV MV HVÂ
Screened separable connectors and surge arresters must be provided by the same manufacturer and used only with one cable connected per 33kV phase. Some types of surge arresters exceed the permissible dimensions as outlined in the table above.
Ellis Patents | Nexans | ABB Furse | Prysmian | Pfisterer – Distributors
Credit Nexans – contact us for HV Cable Joints, Terminations & ConnectorsÂ
Credit ABB – Joint, Terminate & Connect Medium & High Voltage Cables
T&D are UK distributors and worldwide exporters of Cable Installation, Cable Jointing, Duct Seals, Substation & High Voltage Electrical Safety Equipment – we service UK and global businesses involved in cable installations, jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV.
Since 1985, T&D have established a solid reputation based on Service, Integrity and Trust – contact us with your enquiry.
by Chris Dodds T&D - estimated reading time 5 minutes
Here, high voltage substation cables are shown connected and terminated into switchgear using 33kV cable terminations.
The copper earthing tapes are used to bond all of the cable glands together which are providing mechanical retention to the 33kV high voltage power cables.
The earth tapes are clamped and attached to the substation earthing system as they are insulated from the 33kV cable box and high voltage oil-filled switchgear. The whole bank of HV switchgear is insulated from the ground and has its own earth which runs through a Current Transformer (CT) for protection reasons – the separate ‘frame earth’ is painted green in the photograph below. The stand for the cable cleats was also bonded to the substation earth. As there is a steel sandwich plate fitted to the front of the wooden cable cleats the threaded bar used is stainless steel to avoid circulating currents.
Client specified expanding foam has been used to seal the substation cable ducts within the high voltage substation – outside the substation the 33kV cable ducts were effectively sealed using a specified system to provide certain protection against water ingress and gas migration using recognised systems such as the CSD RISE duct seal or Filoform Filoseal re-enterable cable seals.
The insulating oil is usually heated before the high voltage cable box is dismantled by venting it above and heating with halogen heaters.
The 33kV cables were stripped using the correct cable jointing tools – the PVC cable sheath was thoroughly stripped from the high voltage power cable using the Boddingtons “plough” type sheath stripper. The cable jointer then removed the XLPE insulation cleanly and without damaging the cable using Alroc LH2 tool suitable for cable stripping HV cables up to 60mm.
Finally, Alroc CWB 18-60 tool was used to remove the bonded semicon from the cable – the “blue tool” manufactured by Alroc is preferred by jointers for working on medium/high voltage power cables where a clean square cut of the semicon without jagged finish is vital to the long term reliability of power cable performance.
Poor cable jointing skills with respect to MV-HV cable preparation can create future cable failure potential – it is critical a skilled jointer uses the correct cable tools to prepare MV-HV cables before installing joints, terminations or connectors up to 33kV.
Comments from fellow HV cable jointers:
Jimmy Nicklin:Â “Nice job Craig Kilkenny. I did a nine bank of these 15 years ago and is quite the breakdown and remake to do.”
Dean Wilson:Â “Nice neat work Craig Kilkenny and yes I agree Jimmy Nicklin it’s getting the old oil out that’s a job in itself!”
Andrew Brezovszky: Â “Very neat 33kV cable terminations !”
Should you require any assistance with the selection or specification of heat shrink terminations to suit 33kV high voltage power cables please do not hesitate to contatct us.
T&D distribute the most extensive range of MV & HV Cable Joints & Terminations, Cable Installation Accessories & Cable Pulling Equipment – we service UK and international clients working on underground cables, overhead lines, substation earthing and electrical construction at LV, 11kV, 33kV and EHV transmission and distribution voltages.
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’s Power Blog covers: LV MV HV & EHV Transmission & Distribution, Substations, Switchgear, Cable Jointing & Termination, Cable Fault & Repair, Underground Cables.
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