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Calgary, Canada

AltaLink, L.P. is one of Canada's largest transmission companies. Based in Alberta, AltaLink is responsible for the maintenance and operation of approximately 12,000 kilometres of transmission lines and 280 substations in Alberta. AltaLink is a fully owned subsidiary of Berkshire Hathaway Energy. Wikipedia.

Fares H.,AltaLink | Zayed T.,Concordia University at Montreal
Journal of Pipeline Systems Engineering and Practice | Year: 2010

In Canada and the United States, there have been 700 water main breaks per day costing more than CAD 6 billion since 2000. Risk of failure is defined as the combination of probability and impact severity of a particular circumstance that negatively impacts the ability of infrastructure assets to meet municipal objectives. The presented research in this paper assists in designing a framework to evaluate the risk of water main failure using hierarchical fuzzy expert system (HFES). This system considers 16 risk-of-failure factors within four main categories representing both probability and negative consequences of failure. Results show that pipe age confers a strong impact on risk of failure followed by pipe material and breakage rate. They also show that damage to surroundings has the most negative consequence of a failure event. A set of municipal water network data are collected and used to examine the developed HFES. According to the proposed scale of risk of failure, about 8.4% (13 km) of the network's pipelines are risky and require mitigation actions in the short term. © 2010 ASCE. Source

Schwartz J.,AltaLink | Schwartz J.,University of Calgary | Rahimi E.,University of Calgary | Zareipour H.,University of Calgary
2014 North American Power Symposium, NAPS 2014 | Year: 2014

This paper proposes a 60 Hz equivalent to the CIGRE benchmark model (CBM) for HVDC control studies. Component configuration and system impedances of the PSCAD/EMTDC implementation of the CBM are modified to arrive at the 60 Hz equivalent model. These parameter changes are discussed and validation is given. Simulations are conducted in steady state and compared to that of the CBM. The response of the proposed equivalent to a current order step-response and AC faults are compared to that of the CBM. The performance comparisons match closely and this paper concludes that the proposed 60 Hz equivalent is adequate for use when running simulations that require an HVDC benchmark model be connected to a representation of a 60 Hz AC network. © 2014 IEEE. Source

Kwon Y.,Toronto Public Library | Lemieux M.,AltaLink | McTavish J.,Health science Library | Wathen N.,University of Western Ontario
Journal of the Medical Library Association | Year: 2015

Objective: The purpose of this study was to compare effectiveness of different options for deduplicating records retrieved from systematic review searches. Methods: Using the records from a published systematic review, five de-duplication options were compared. The time taken to de-duplicate in each option and the number of false positives (were deleted but should not have been) and false negatives (should have been deleted but were not) were recorded. Results: The time for each option varied. The number of positive and false duplicates returned from each option also varied greatly. Conclusion: The authors recommend different de-duplication options based on the skill level of the searcher and the purpose of de-duplication efforts. © 2015, Medical Library Association. All rights reserved. Source

Kumar K.,SNC - Lavalin | Dwyer J.,AltaLink
Electrical Transmission and Substation Structures 2015: Technical Challenges and Innovative Solutions in Grid Modernization - Proceedings of the 2015 Electrical Transmission and Substation Structures Conference | Year: 2015

The Heartland Transmission Project is a recently built 500kV double circuit transmission line near Edmonton, Alberta, Canada. The scope of the project was to connect the existing Ellerslie Substation, located within Edmonton, to the new Heartland Substation, located approximately 65 kilometers northeast of Edmonton in the Heartland Industrial Area, near Fort Saskatchewan, Alberta. Approximately half of the line was built within a designated Transportation and Utility Corridor (TUC) with a section passing between the communities of Edmonton and Sherwood Park. The Alberta Utility Commission (AUC) declared that a 10 km section of the line passing between the communities of Edmonton and Sherwood Park were to be built using tubular steel structures rather than the traditional lattice steel towers. The process of developing a family of tubular monopoles consisting of tangent, light, and medium angle suspension towers and site-specific dead-end towers is outlined. The design, from a conceptual stage through to the project's completion is discussed. Topics will cover the development of pole design requirement drawings, structure design, manufacturing, full scale testing, and foundation design. © ASCE. Source

Antonova G.,ABB | Chang J.,ABB | Forrester R.,AltaLink | Shore J.,EPCOR Distribution and Transmission Inc. | Stroemich P.,EPCOR Distribution and Transmission Inc.
2014 67th Annual Conference for Protective Relay Engineers, CPRE 2014 | Year: 2014

This paper briefly describes line current differential schemes, and focuses on their dependencies on communication channels. Dependencies on bit error rate and transmission latency are discussed. Effect of time synchronization accuracy on sensitivity of line current differential scheme is explained in details. Types of communication channels are discussed including dedicated, multiplexed and packet-based. Special attention is given to dedicated channel whose meaning has evolved with development of communication technologies from dedicated physical connection to dedicated bandwidth, etc. Examples of common and evolving communication technologies used for line current differential schemes are given, including the IEEE C37.94 N x 64Kbit/s and Multi-protocol Label Switching (MPLS). Known challenges with adoption of these technologies are also provided. © 2014 IEEE. Source

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