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World First | EHV 1,100kV GIS Tested By Standard Lighting Impulse Voltage

PowerHV have successfully performed onsite Lighting Impulse Voltage Testing on 1100kV GIS by 3,000kV 300kJ SF6 insulated impulse voltage generator.

It is the first time in the world that EHV GIS was tested by Standard Lighting Impulse Voltage on site. This time, the standard Lighting Impulse Voltage Test is mainly made on 1100kV GIS already installed as part of first phase project, including bushing, isolating switches, busbars, grounding switches.

YangZhou Power Electric Co., Ltd. is the subsidiary company of the Yangzhou Xinyuan Electric, Co., Ltd – PowerHV are world leading High Voltage Testing specialists for switchgear, transformers and cable accessories including (cable joints and terminations).

➡ See also: Insulating Gloves | Insulating Sticks | Substation Life Saving Kits | Transmission Line Earthing Equipment | Insulated Matting

High Voltage Cable Accessories Testing

Cable End Termination for 220kV Power Cable

800kV Water Termination and Water Condition Unit

350kV Water Termination

Jointers blog

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. ➡

Sicame LV Resin Mains Cable Joint – 3 Core PILC to Hybrid With Service Branch & PILC Joints

Image Courtesy of: Gavin Duke (LV 11kV 33kV UKPN Cable Jointer)

Pictured: 2 x .3 Imperial PILC (Paper Insulated Lead Covered) cable jointed to 185sqmm Hybrid with 2 x 35sqmm 3 Phase Services and 1 x 35sqmm Single Phase Service Cable Branched.

2 x 35sqmm 3 Phase Cable to .0225 Imperial 4 Core PILC straight joints and 1 x 35sqmm Single Phase to .0225 2 Core PILC Joint. These cable joints were installed to replace 2 faulted “T Joints”.

Video : Locating & Repairing An Overhead Line Fault By UKPN

T&D are Main Distributors and Stockists for the Sicame Key Product Groups – Mechanical Connectors for Straight Service Joints, Service/Mains Branch Joints, Single Service Joints, Double Service Joints, Mains Service Breech Joints, CNE Joints, Mains Straight Joints, Mains Breech Joints and Termination Lugs.

T&D are UK Distributors for Sicame.

Jointers blog

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. ➡

Preventing Costly Outages With Factory Grade Technology

Preventing Costly Outages With Factory Grade Technology

Guest Article: IMCORP by Ben Lanz

uploaded by Natalie Lundie – Thorne & Derrick Supply Chain: Marketing Lead

IMCORP is a provider of underground power cable reliability services for medium and high voltage (5kV to 500kV) power cable systems for both aged and new cable installations.

IMCORP’s Factory Grade® technology will access MV HV Cable Systems, identify cable systems in need of rehabilitation allowing the customer to ultimately restore the cable system to like-new status.

➡ Did you Know? – Last year, on renewable sites, IMCORP identified 516 substandard cable terminations, 330 substandard cable splices, and 151 cable defects.

The featured image at the top of the page is a cable defect recently identified during our partial discharge testing at 300mw solar site. During our testing of this ~1000-foot-long buried cable IMCORP discovered this defect at ~753-foot mark.

A costly Power outage avoided

IMCORP offline Factory Grade® assessments can be capitalized, as part of a cable life extension program. Additionally, our assessment is non-destructive and is a cost-effective alternative to wholesale cable replacement.

IMCORP enables clients to improve cable system reliability through asset life cycle management services including commissioning, maintenance, and retirement.

Avoiding cable system failures and high O&M costs begins with understanding how cable failures occur and having the ability to detect these defects in advance of a breakdown.

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.

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 

Prysmian Click Fit 132kV EHV Cable Joints

Images Courtesy of: David Young (HV Cable Jointer)

Pictured: Prysmian 132kV Click Fit Cable Joint. Connector pressed on, semi-conductive screen glassed and groove cut in for shield.

T&D 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.

Prysmian 132kV

• 132kV XLPE Cable 630mm² Cu/Pb
• 132kV XLPE Cable 1000mm² Cu/Pb
• Composite Outdoor Cable Terminations
• Single Core Transition Cable Joints
• Three Core Transition Cable Joints
• Link Boxes
• Bonding Lead
• CFJ-145 Click-Fit Straight Joint 138kV
• CFJX-145 Click-Fit Straight Joint With Sheath Interruption 138kV
• CFJ-145-T Click-Fit Size Transition Joint 138kV
• CFJX-145-T Click-Fit Transition Joint With Sheath Interruption 138kV

Click Fit Cable Joints

Click-Fit joints are used in the high voltage power grids, connecting all combinations of cables with minimum effort and in less time than conventional joints.

The pre-moulded, factory tested Click-Fit joints over a fail-safe connection every time. Click-Fit joints can be split into four main categories – sectionalised and un-sectionalised (symmetrical joint and asymmetrical joints type to connect two different extruded cables), transition joints for extruded to paper cable connections and branch (Y) joints.

Click-Fit joints are highly reliable cable connection assemblies designed to connect any extruded high voltage cable and able to cover a broad range of applications. Also Click-Fit technology allows for pre-fabrication of the XLPE cable prior to disconnection of the circuit, thus reducing network down time.

Further Reading

Prysmian’s Medium Voltage Power Cables BASEC Approved

11kV Prysmian Float Fit Cable Terminations (SSE) Terminated Into 11kV/33kV Transformer

Jointers blog

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. ➡

Partial Discharge 5 Common Questions

Partial Discharge

An Introduction To The Causes & Effects Of PD

• Thanks to Mo Cowhig Managing Director at Northern Power Services Ltd for the permission to republish

1. What Is Partial Discharge?

Partial discharges (PD) are small, localised breakdowns in the insulation in HV equipment and cables. PD does not span the whole insulation, hence ‘partial’. PD activity is an indicator of issues inside and outside the insulation. Testing for PD activity provides an early warning of a potential insulation failure.

2. What Causes Partial Discharge?

PD can be caused by one or a combination of factors. Faults in the manufacture of the insulation, not apparent when new, can lead to PD after being put into service. Poor installation and maintenance can also lead to PD. Ageing and stresses over time, combined with environmental factors, can cause PD.

3. How Do We Detect Partial Discharge Activity?

Partial discharge can be classified into three types. PD can be external on the surface, internal to the insulation and where sharp protrusions lead to corona activity.

Each of these sources require different detection methods. PD activity leads to the generation of a range of different energy types including heat, audible sound, ultrasonic sound, radio waves and transient earth voltages.

By detecting these different energies, and eliminating background noise, we can detect the presence and severity of PD activity. We use special instruments to detect these energy types and in combination determine the presence of PD.

4. Why Survey For Partial Discharge?

The effects of PD can be highly detrimental to the insulation medium. PD changes the nature of the insulation which gets increasingly worse over time.

Left unchecked, the insulation can become unable to withstand the stress of high voltage and a complete failure occurs. This final breakdown is catastrophic causing large scale damage to equipment and a danger to personnel.

It is accepted that over 80% of sub-station failures are caused by PD. These failures are entirely preventable by regular surveying for PD.

5. Do I Need To Interrupt My Supply?

Different equipment require different methods. For the purpose of an initial PD survey the equipment needs to be energised, so no outage is required. If PD is detected a more in depth study may be required.

Introduction to Partial Discharge Training Course

NEW – Introduction to Partial Discharge

A one day training session, carried out at your site. The training is aimed at engineers, facility managers and anyone new to partial discharge.

Topics covered include:

• What is partial discharge
• Causes of partial discharge
• Why test for partial discharge
• Detection techniques
• Practical – use of a hand held detector

To Book Click Here

Northern Power Services Ltd is a UK based expert in condition assessment and monitoring of electrical infrastructure. They work closely with you as an integral part of your asset management plan.

For More Details Contact Information Below:

Maurice D Cowhig

Founder & Managing Director

[email protected]

Thorne & Derrick

Specialist Electrical Distributor

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