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Low voltage ABC has already been developed in several countries across the globe and promises to be cheaper, safer, more reliable, require less tree clearing and pruning, be more aesthetic, be less labor-intensive, require less maintenance and eliminate bushfires being initiated by conductor
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In the
Dandenong Ranges area Victoria 2014. Medium voltage (11-22 kV) ABC is being replaced with underground cable due to high failure rates of HV ABC, with life expectancy of just 10 years, when original life was expected to be approx 30 years. Due to degraded cable, cost of repairs &
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concerns have been expressed that the lower conductor alone may be broken, (by high vehicle or falling tree for example) but with the upper phase conductors intact. This is a potentially dangerous fault condition. With ABC, a simultaneous disconnection of all conductors is more likely.
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Areas with large trees and branches falling on lines are a problem for ABC as the line degrades over time. Due to the very large strain forces cracking and breaking insulation can lead to short circuit failures which can then lead to ground fires due to dripping of molten insulation.
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K-Electric first introduced ABC, in
Gulshan-e-Iqbal area of Karachi city with a pilot project was completed in March 2014. Following 90% theft loss reduction, the decision to roll out the new cabling across the entire K-Electric distribution network of Karachi.
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Older installations are known to cause fires in areas where falling large trees or branches regularly cause breaks in lines and or in insulation leading to short circuits which can then lead to burning insulation dripping to ground and starting ground
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Improved reliability in comparison with both bare conductor overhead systems and underground systems. Insulated conductors prevent accidental contact and supply can be maintained temporarily in the event of a suspension system
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In moister climates, tree growth is a significant problem for overhead power lines. ABC will not arc over if touched by tree branches. Although persistent rubbing is still a problem, tree-trimming costs can be reduced.
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utilizes the same principles as overhead power lines, except that they are closer together to the point of touching but each conductor is surrounded by an insulating layer (except for the neutral line).
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bundled tightly together, usually with a bare neutral conductor. This contrasts with the traditional practice of using uninsulated conductors separated by air gaps. This variation of
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In some bushfire prone areas though, older ABC installations are now creating fires, particularly at points where the cables have damaged or been degraded over time.
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Can lead to much longer repair times for installations in hilly areas due to much higher line weights requiring bigger and more specialized equipment to repair.
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Williamson, C.E.; Garner, M.P.; Barber, K.W.; Elford, R.F. (28–30 November 1988). "Development and introduction of aerial bundled cables in
Australia".
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The main objections to the traditional design are that the multiple conductors are considered unappealing, and external forces (such as high winds) can
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At junction poles, insulating bridging wires are needed to connect non-insulated wires at either side. ABC can dispense with one of these splices.
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Low voltage ABC lines were first installed on the rural Irish distribution networks in 1981. It is not known where ABC was first installed.
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Insulation degrades due to sun exposure, though the critical insulation between the wires is somewhat shielded from the sun.
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Relative immunity to short circuits caused by external forces (wind, fallen branches), unless they abrade the insulation.
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ABC have been introduced into
Australian power systems progressively since 1983. This was partly in response to
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Less risk of a neutral-only break from tree or vehicle damage, increasing safety with TNC-s systems.
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in drier climates. In the UK where some supplies to rural property are converted to PME/MEN from TT
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Significantly improved safety for linespersons, particularly when working on live conductors.
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Ease of erection and stringing, less labor-intensive, less construction resources needed.
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Can stand in close proximity to trees/buildings and will not generate sparks if touched.
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The Aerial
Bundled Cables (ABC) and the Characteristics of its Semiconductive Shield
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Low voltage ABC lines are installed in urban distribution systems commonly.
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386:. IEE Colloquium on Review of Options for Overhead Rural Distribution.
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Simpler installation, as crossbars and insulators are not required.
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Failure modes through punctures, electrical tracking, and erosion.
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Less required maintenance and necessary inspections of lines.
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Electricity theft is made harder, and more obvious to detect.
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Shorter spans and more poles due to increased weight.
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177:. The resultant sparks have been a cause of
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113:Learn how and when to remove this message
419:PE and XLPE Insulted Ariel Bundle Cables
20:used in high-voltage power transmission.
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429:Low Voltage Ariel Bundled Cable Manual
258:Additional cost for the cable itself.
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213:Little to no tree trimming necessary
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299:maintenance and bushfire risk.
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222:More aesthetically appealing.
380:Murray, T. (2 March 1990).
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383:Aerial bundled conductors
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414:Continental Cables Spec
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359:. pp. 113–117.
155:overhead power lines
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279:International usage
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409:Nexans Order
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449:Electricity
340:References
202:Advantages
198:clashing.
149:or simply
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320:Sri Lanka
290:bushfires
284:Australia
248:collapse.
179:bushfires
443:Category
328:See also
311:Pakistan
303:Ireland
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