Pictured:Â 145kV Pfisterer Cable Joint
Image Courtesy of: CB Jointing
Installed by: Chris Barker (EHV Cable Jointer and Owner at CB Jointing)
T&D are Main Distributors & Stockists for the Pfisterer range of Medium Voltage Power Products including Connex Plugs, Cable Jointing Tools, Sicon Connectors, Surge Arresters and Electrical Safety Equipment.
Subscribe now to our POWER NEWSLETTER– a monthly email circulation packed with news, projects, videos, technical tips, training information, promotions, webinars, career opportunities and white papers.
Includes access to our popular JOINTERS BLOG with contributions from utility professionals, linesmen and cable jointers working on MV HV EHV cables and overhead lines typically at 11kV, 33kV, 66kV and up to 132kV.
15,000+ Subscribers. ➡ 
Pictured: 110kV Prysmian Plug-In Cable Termination For SF6 Gas Insulated Switchgear
Image courtesy of: Andrew Brezovszky (EHV Cable Jointer & Director at Matrix Power Solution Pty Ltd)
Thorne & Derrick are distributors for Prysmian Cable Components which includes their range of Bicon cable joints, cable cleats, cable glands and jointer tooling for LV, MV and HV cables.
Some Comments via LinkedIn
Ahmed Gouda : Great job! But if i may ask, why you did not install the insulator first inside the GIS housing?
Andrew Brezovszky : Hi Ahmed, not sure about your question … As far as I’m aware, there isn’t another method for these GIS cable terminations. When we are actually plugging them in, we install the shield and connectors and that’s how they are being raised into the chamber.
Chris Barker : Ahmed in answer to your question. Certain manufacturers have the insulator installed first then the cable termination is made and plugged into the insulator. Others you complete the termination and then plug into the switchgear.
Ahmed Gouda : Yes, normally in the plug in type, the insulator is mounted first in the cable housing then the cable with the stress cone is plugged in. Otherwise if its a wet type termination ( insulator is filled with oil).
Chris Barker : Some company’s have a dry type which they still mount the insulator on the cable then into the switchgear.
Prysmian HV Cable Accessories – Overview
Subscribe now to our POWER NEWSLETTER– a monthly email circulation packed with news, projects, videos, technical tips, training information, promotions, webinars, career opportunities and white papers.
Includes access to our popular JOINTERS BLOG with contributions from utility professionals, linesmen and cable jointers working on MV HV EHV cables and overhead lines typically at 11kV, 33kV, 66kV and up to 132kV.
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Image courtesy of: Johnny Chan – Marketing Executive at Yangzhou Power Electric Co. Ltd
Pictured:Â 800kV Water Termination System For 500kV XLPE Cable Testing
Subscribe now to our POWER NEWSLETTER– a monthly email circulation packed with news, projects, videos, technical tips, training information, promotions, webinars, career opportunities and white papers.
Includes access to our popular JOINTERS BLOG with contributions from utility professionals, linesmen and cable jointers working on MV HV EHV cables and overhead lines typically at 11kV, 33kV, 66kV and up to 132kV.
15,000+ Subscribers. âž¡
Image courtesy of: Darren Street – Cable Jointer at D+R Jointing Services Ltd
Pictured: Pfisterer Connex Cable Plugs Terminating XLPE Cable Into 11kV/33kV Transformer – the Connex cable terminations are shown connecting 33kV single core 500sqmm cables into a 33kV to 11kV transformer.
T&D are Main Distributors & Stockists for the Pfisterer range of Medium Voltage Power Products including Connex Plugs, Cable Jointing Tools, Sicon Connectors, Surge Arresters, SEANEX and Electrical Safety Equipment.
Subscribe now to our POWER NEWSLETTER– a monthly email circulation packed with news, projects, videos, technical tips, training information, promotions, webinars, career opportunities and white papers.
Includes access to our popular JOINTERS BLOG with contributions from utility professionals, linesmen and cable jointers working on MV HV EHV cables and overhead lines typically at 11kV, 33kV, 66kV and up to 132kV.
15,000+ Subscribers. âž¡
Special thanks to Harriet Robertshaw at HVPD for the kind permission to republish
Following the visual identification of a fault in a 25kV cable, a Rapid Transit Organisation in the UK had a requirement to locate the presence of any further faults across its cable network, which was approximately 40 years old.
Offline Time Domain Reflectometry (TDR) testing was conducted across three sections of 25kV trackside PILC to pinpoint the locations of any further insulation degradation present.
Offline TDR testing was conducted from the known failure point of the cable, back to each cable sealing end termination using an HVPD Diagnostic Unit.
Offline TDR testing was also conducted on an additional cable section from an Overhead Line Equipment (OLE) switch. The cable was mapped using a Pulse Generator.
Offline TDR is performed by injecting a low voltage pulse onto the core of the cable under test. High changes of impedance within the cable will create reflections of the original injected pulse.
These areas of high impedance change can typically be attributed to either cable faults or joints and therefore analysis of these pulse reflections can indicate fault and joint locations. TDR can also be used as a tool to verify the total length of the cable if this is unknown.
The test is carried out by measuring the injected pulse return time (i.e. the time for an injected pulse to propagate from one cable end and back) in order to provide the locations of changes in impedances, such as cable joints and the end of the cable. TDR testing is utilised to provide accurate fault location data in cables.
Background Theory
Initial results showed that there were no visible impedances relating to cable joints or faults in the cable section located from the original failure point back to sealing end terminations.
However further testing of the cable section leading back to an OLE switch demonstrated a large impedance change not associated with any known joint location. This impedance location was observed to be approximately 239 meters from the test location.
Following this observation, a visual inspection along the identified cable section route was performed. Upon lifting the cables covers at approximately 241 meters along the cable from the test point a visibly clear cable fault was identified.
TDR Trace
HVPD supplies a comprehensive range of equipment to detect and monitor On-line PD for the condition assessment of in-service power cables, switchgear, motors and generators, and transformers rated at 3.3kV and above. Our PD testing and monitoring technology provide you with an early warning of developing insulation faults, helping you to avoid costly failures and resulting unplanned network outages.
To find out how we can test and monitor your cable network for PD and locate any faults, terminations or joints, get in touch today at [email protected] or call us on 0161 877 6142.
Established since 1985, T&D International based in the UK 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, Access Chambers, Cable Cleats, Duct Seals, Cable Transits, 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, Cembre, Prysmian, Ellis Patents, ABB & Furse.
T&D Providers Of Jointer Training Courses By Pfisterer CONNEX & Nexans Euromold
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