Cable Cleats for Wind Energy Projects

By Chris Dodds on 5th September, 2014

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Cable Cleats for Wind Energy Projects

Cable cleats are vital to fix power cables to the cable containment infrastructure of renewable energy projects, especially wind turbine applications.

Cable cleats are used in conjunction with cable tray, ladder and basket. Cable cleats fix, retain and support low and high voltage (LV-HV) power cables during the operational life of the electrical system where they are installed.

Ellis Patents Cable Cleats

The ability of cable cleats to contain short-circuit situations is a primary function of a reliable cleating system - short circuits can unleash dynamic forces of 10,000 N/m.

When LV-HV power cables are installed inside wind turbines or to the outside of lattice structures in smaller wind turbines, it is a keystone of the electrical specification that cables are cleated and secured in an efficient and reliable way.

As a guideline minimum, the following factors need to be considered when selecting and specifying cable cleats in wind towers.

* Dynamic Force Resistance In Short Circuit Conditions - cable cleats should be able to withstand the forces that would be generated in a short circuit. If an inappropriate under-specified cable cleat or cable tie were used, damage would occur to both the cable and the surrounding structures.

During a short circuit, the maximum allowed contact pressure on the cable insulation should not be exceeded - Ellis Patents cable cleats are supplied integral with cable cushion liners to prevent cable insulation damage to "soft-sheath" type cables.

For instance, Ellis PatentsWind Farm Cable Cleats Emperor Cable Cleats are in service at London Array Offshore Wind Farm and provide short circuit test levels up to 235kA at 225mm cleat spacings (156kA @ 600mm cable cleat spacings) - manufactured from marine grade 316 stainless steel Emperor Cleats provide astonishing resistance to salt-sea spray and sea-water environments.

Cable cleats must withstand peak short circuit forces generated by the actual cable installation.

Failure to specify cable cleats which can withstand the peak short circuit force generated by power cables in that specific cable installation can be catastrophic - see IEC Standard 61914 : Cable Cleats & Short-Circuit Calculations.

Failure to meet this condition could cause irreversible damage to cable in particular and electrical infrastructure in general.

In such short circuit situations where cable cleats or cable ties have failed to retain cables a part or complete cable replacement programme would need to be implemented - resultant downtime and revenue loss could be immeasurable.

Replacing a section of damaged cable inside a wind turbine tower or outside a lattice structure entails a serious challenge - during this period, the wind tower would not be able to generate energy and so alongside repair costs and incurred liabilities, there would be a significant loss of power sales to the Grid.

Vital Short Circuit Protection with Ellis Patents Cable Cleats

Ellis Patents are a leading voice in the campaign to have cable cleats reclassified as short-circuit protection devices. A move that would mean cable cleats would be placed on a parallel with fuses and circuit breakers.

"This reclassification makes absolute sense. In the event of a cable fault, the forces between cables reach their peak in the first quarter cycle, which is the point that cable cleats earn their crust. In contrast, circuit breakers typically interrupt the fault after 3 or even 5 cycles by which time, if the cable cleats are underspecified, the cables will no longer be secure, but will be putting vital electrical installations and lives at unnecessary risk," says Paul Nolan UK Sales Manager, EP.

* Cable Formation - depending on the type of cable installation there are several ranges of potential cable cleats. These include : Single Cable Cleats, Trefoil Cable Cleats, Quad Cable Cleats and Bundled Cable Cleats.

* Cable Outside Diameter - any type of Ellis Patents Cable Cleats suit an outer diameter within certain ranges.

Specifying the correct cable cleat should not be a complicated task - follow good practice and be led by manufacturers specification advice. This simple advice can ensure the safe and secure installation of cables on wind turbines, minimising the risk of damage and the resulting costs and downtime.

T&D distribute Ellis Patents cable cleats providing safety critical support to vital cable circuits. Cable cleats must withstand peak short circuit forces generated by the actual cable installation - Ellis Patents 3rd party certified cable cleats provide peace of mind containment of low and high voltage cables.

Ellis Patents are global leaders in the innovation and manufacture of nylon, aluminium and stainless steel cable cleats - EP satisfy the operational requirements of the construction, oil, gas, rail, utilities, wind energy and power generation industries.

Holding Power is Ellis Patents guarantee that EP Cable Cleats will contain dangerous short circuit forces - protecting your people, power and plant. Without fail - specify Ellis Patents Cable Cleats.

Video : Ellis Patents Emperor Cable Cleats, Short-Circuit Test. This video clip demonstrates the short-circuit withstand capability of Ellis Patents Emperor Trefoil Cleats. A short-circuit of 59kA RMS (118kA peak) is subject to the three-phase cable arrangement for a period of 0.1 seconds, showing the power cables being forced apart by the physical forces present under such fault conditions and demonstrating the need for correctly specified cable cleats.

  • Further Ellis Patents reading

Ellis Patents Cable Guide Clamp - Video

Cable Cleats - The Ellis Patents Black Book Guide To Cable Cleats 

Cable Cleats From Ellis Patents - The Innovation Game 

Ellis Patents Pegasus Cable Hangers

 

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Category:  Cable Cleats & Cable Ties

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