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Substantial Flooding in Mozambique Impacts Power Delivery to South Africa
ACCC Conductor used for Emergency HVDC Repair
Earlier this year flooding in Mozambique knocked down a lattice structure on a section of the Cahora Bassa 533 kV HVDC line feeding South Africa. Quanta Services Africa was awarded a contract to perform short term emergency repairs. To expedite restoration and accommodate a 812 meter (2,664 foot) span, Quanta in association with Trans Africa Projects, Transmission Grid Consulting, ARB Holdings Ltd, Mechem and Chopperworx selected and installed a 5.3 km (3.3 mile) section of a three bundle 318.6 mm^2 Lisbon size ACCC conductor.
The original conductor was a four bundle ACSR Zambezi size (565.38 mm^2), but due to the ACCC conductor's increased ampacity and strength, it was found - after taking corona issues into consideration - a 3 bundle 315.5 mm^2 ACCC Lisbon configuration would suffice. Tests of the ACCC Lisbon were performed at the CSIR where its breaking strength was found to be 109 kN. The weight of the ACCC conductor was roughly one-half the weight of the ACSR conductor it replaced (948kg/km verses 1,800kg/km) which helped accommodate the long span.
Because one of the towers could not be replaced prior to the new conductor being installed, the initial tension was extremely high. To mitigate vibration it was decided to install spacers at approximately 40 meter intervals. Satellite phones were used to communicate during the four weeks crews worked around the clock to restore the line. Because wildlife and theft were legitimate concerns, the site was fenced off with 24 hour security.
Due to the extent of the flooding, access roads were wiped out so all materials and crew had to be airlifted in from a base camp about 20 km away. Two helicopters were onsite for the duration of the project. Also, due to the possibility of old land mines, the area had to be swept and cleared before crews were allowed to proceed. This process took about two weeks. Another part of the logistic challenges included the fact that permits and clearances for aircraft, fuel and material delivery had to be secured as the work was performed in a national park. The project also required getting materials through customs on an expedited basis. The Mozambique government was very supportive throughout the project.
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Construction Begins on New ACCC Installation in Russia
New 220 kV double circuit ACCC line being installed to deliver reliable power to Volkswagen manufacturing plant in Kaluga, Russia
Earlier this month the Electro Set Stroy Construction company with support from Sim Ross began pulling in 30km of 421.4 mm^2 (832 kcmil) ACCC Brussels size conductor on new steel monopoles and lattice structures near Kaluga, Russia, on the Orbita-Cherepet / Sputnik-Kaluskaya project.
The project's owner Federal Grid Company "FSK" is the largest publically traded electricity transmission company in the world. FSK expects to invest approximately $24.4 billion USD in infrastructure upgrades over the next five years. Vimpel Set Stroy, the engineering firm that designed the line considered several other conductor types before selecting ACCC. ACCC was chosen for its higher-capacity, lower-sag and improved efficiency compared to other all-aluminum or steel/composite reinforced conductors. The average span length between structures is slightly over 300 meters with a 650 meter river crossing at one location. The project is slated for completion prior to winter and will provide reliable power for Volkswagen's high-capacity manufacturing plant.
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ACCC Conductor being installed for FSK in Russia
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Recent Articles & News
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Proven Reliability at over 260 Projects worldwide
 The graph above shows the sag of various Drake size conductors on a 65 meter (215 foot) test span under a load of 1,600 amps. In addition to the ACCC conductor's exceptionally low sag, it also operated 60 to 80 degrees C cooler than the other conductors tested under equal load conditions. This underscores the ACCC conductor's outstanding performance and efficiency. Reduced line losses can not only reduce fuel consumption (and associated emissions), it can also reduce generation capacity requirements.
To learn more about how the ACCC conductor can work for you, please visit our website www.ctcglobal.com
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ACCC Conductor is an internationally patented and trademark registered product of CTC Global Corporation. The ACCC conductor is manufactured in association with several qualified and licensed international stranding partners. If you are interested in the ACCC conductor, please contact CTC Global to make sure your supplier is authorized to produce ACCC. Thank You.
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Please Visit CTC Global at:
October 13-16
Brasilia, Brasil
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Free
Conductor Selection Software
Responding to an ever-increasing demand to help select the most appropriate size of the highest performing ACCC conductor available, CTC Global has developed a new software program, CCP.
The program is available at no charge to utility planners, transmission engineers and others involved in conductor selection, project engineering and project economics. Using the design parameters associated with your specific project, CCP can calculate and compare ampacity, sag, tension, line losses, and the economics associated with the reduction in thermal sag and line losses the ACCC conductor offers compared to any other conductor of the same diameter and weight.
To receive a free copy of CCP:
CLICK HERE
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Engineering with High-Capacity, Low-Sag ACCC Conductor
To help T&D planners, engineers, and technicians take full advantage of the ACCC conductor's attributes, CTC Global has published a 250 page Engineering Manual. Contact CTC Global today to request a copy.
Request Your Free Copy!
CLICK HERE
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Technical Updates
Why Choose ACCC?
In addition to greater strength, improved corrosion resistance and outstanding resistance to cyclic load fatigue, the ACCC conductor's lighter weight composite core allows the incorporation of up to 30 percent more aluminum in any given diameter without a weight penalty.
The added aluminum content not only helps improve ampacity, it also reduces the conductor's electrical resistance. Decreased electrical resistance reduces line losses by 25 to 40 percent or more depending upon load level. In addition to associated fuel and emission savings, reduced line losses also increases the generation capacity required to support those losses.
Using ACCC, as more than 100 international utilities have already discovered, can not only improve grid reliability via reduced sag and higher capacity, it can also improve grid efficiency and reduce the need to build more generation to support growing demand.
Conversely, ACCC can effectively deliver more power from a renewable resource which can improve that project's economics.
The graph in the column to the left compares the thermal sag of several conductor types (Drake size) under a 1,600 amp load. Note how much cooler and more efficiently the ACCC conductor operated compared to the others tested.
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