French Electricity Transmission Network

Paris, France

French Electricity Transmission Network

Paris, France
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Hedman K.W.,Arizona State University | Panciatici P.,French Electricity Transmission Network
IEEE Transactions on Power Systems | Year: 2017

The role of power flow control is increasing in importance due to variable resources and the difficulty of siting new transmission. While HVDC, flexible AC transmission systems, and transmission switching are utilized today, their capabilities have been incorporated into existing operations decision support tools, such as energy management systems, only to a very limited extent. As a result, such flexible transmission assets are underutilized. This special section of the IEEE Transactions on Power Systems is focused on software development, modeling, and algorithms that address practical challenges on real-world test cases in order to achieve near-term industry adoption. © 1969-2012 IEEE.

Clerc B.,French Electricity Transmission Network
IET Conference Publications | Year: 2017

HVDC links, FACTS and wind farms under construction in France and worldwide are embedded in highly meshed networks. The risk of interactions between such power electronics components can impact the performance of the network. This paper provides the different types of interactions that can occur between power electronics equipment and an analytical criteria to investigate the risk of interactions. Practical test case based on future installations in the Northen France network is used.

Ertle B.,French Electricity Transmission Network
2017 12th International Conference on Live Maintenance, ICOLIM 2017 | Year: 2017

SERECT regularly develops new innovative low voltage live working tools, in partnership with industrial companies. At the initiative of these developments there are two main sources of inspiration: First, original ideas from operators working in the field. And secondly the analysis by SERECT of accidentology, incident reports, and audits in the field. In both cases it is after analyzing the relevance of development, to provide LW operators the tools to secure practices. To achieve this goal an innovative tool must be ergonomic, practical, and must make a real improvement to the user in terms of comfort and safety. © 2017 IEEE.

Giannini L.,French Electricity Transmission Network
2017 12th International Conference on Live Maintenance, ICOLIM 2017 | Year: 2017

Since 2006, RTE has been installing Aluminium Conductor Steel Supported (ACSS) type low-sag cables on the network. These steel-core conductors are covered by annealed trapezoidal-shaped aluminium wires, giving them superior power ampacity compared to conventional round wires conductors. Thanks to a lower coefficient of thermal expansion they can carry greater currents. However, if the conductor reaches higher temperatures, the outer layer of the conductor is subject to ductile behaviour. Consequently, the trap wires are more sensitive to surface and structural damage and there is a need to control the temperature of the conductor when the operator carries out maintenance work in contact with the conductor. © 2017 IEEE.

Alexandre B.,French Electricity Transmission Network
2017 12th International Conference on Live Maintenance, ICOLIM 2017 | Year: 2017

RTE carries out live helicopter maintenance operations from between 63kV to 400kV. These operations are led by specialists from baskets suspended from a helicopter. © 2017 IEEE.

Toussaint M.,French Electricity Transmission Network
2017 12th International Conference on Live Maintenance, ICOLIM 2017 | Year: 2017

Most live works carried out on distribution overhead lines require the displacement and support of conductors by means of: The assembly of hot sticks, or the jib of an aerial lift with insulating boom, or suspension pullers, or tension pullers. In order to ensure safe operations, it is essential to be able to assess the conductor stress and the loads on the tools and to verify that they do not exceed prescribed limits. Therefore, for more than 25 years SERECT has developed ECART, a calculation program now released as a Java application for Windows and available in several languages. This paper intends to recall the basics of overhead line mechanics embedded by ECART and to present the software features. © 2017 IEEE.

Bontemps S.,French Electricity Transmission Network | Bontemps S.,National Polytechnic Institute of Toulouse | Vendier L.,French Electricity Transmission Network | Vendier L.,National Polytechnic Institute of Toulouse | And 2 more authors.
Journal of the American Chemical Society | Year: 2014

Functionalization of CO2 is a challenging goal and precedents exist for the generation of HCOOH, CO, CH3OH, and CH4 in mild conditions. In this series, CH2O, a very reactive molecule, remains an elementary C1 building block to be observed. Herein we report the direct observation of free formaldehyde from the borane reduction of CO2 catalyzed by a polyhydride ruthenium complex. Guided by mechanistic studies, we disclose the selective trapping of formaldehyde by in situ condensation with a primary amine into the corresponding imine in very mild conditions. Subsequent hydrolysis into amine and a formalin solution demonstrates for the first time that CO2 can be used as a C 1 feedstock to produce formaldehyde. © 2014 American Chemical Society.

Doquet M.,French Electricity Transmission Network
IEEE Transactions on Power Systems | Year: 2015

In development studies carried out on large power systems, a need may arise for a reduction in which whole regions are seen as the nodes of a simplified graph whose edges replace the inter-regional links. The property required from this kind of backbone representation may be that reduced load flows stay close to their physical counterpart on the full grid. In the dc approximation, such a model can consist of a set of impedances attached to each edge, along with a flow characterizing a particular state of the system. The identification of the model accommodating best a large sample of flows, representative of all of their possible diversity, is a nonconvex problem for which two partially convex reformulations are proposed. Simple ad hoc algorithms are introduced as a way to find approximate solutions satisfying first-order optimality conditions. © 2014 IEEE.

Faller P.,French Electricity Transmission Network | Hureau C.,National Polytechnic Institute of Toulouse | Berthoumieu O.,National Polytechnic Institute of Toulouse
Inorganic Chemistry | Year: 2013

Aggregation of amyloid-β (Aβ) by self-assembly into oligomers or amyloids is a central event in Alzheimer's disease. Coordination of transition-metal ions, mainly copper and zinc, to Aβ occurs in vivo and modulates the aggregation process. A survey of the impact of CuII and ZnII on the aggregation of Aβ reveals some general trends: (i) ZnII and CuII at high micromolar concentrations and/or in a large superstoichiometric ratio compared to Aβ have a tendency to promote amorphous aggregations (precipitation) over the ordered formation of fibrillar amyloids by self-assembly; (ii) metal ions affect the kinetics of Aβ aggregations, with the most significant impact on the nucleation phase; (iii) the impact is metal-specific; (iv) CuII and ZnII affect the concentrations and/or the types of aggregation intermediates formed; (v) the binding of metal ions changes both the structure and the charge of Aβ. The decrease in the overall charge at physiological pH increases the overall driving force for aggregation but may favor more precipitation over fibrillation, whereas the induced structural changes seem more relevant for the amyloid formation. © 2013 American Chemical Society.

French Electricity Transmission Network | Date: 2012-10-30

A method for monitoring a high-voltage electric-current transmission line includes: determining (100) the ampacity (A) of the high-voltage line from a distribution temperature, conduction parameters and meteorological parameters; measuring (202) the current strength effectively transmitted by the high-voltage line using at least one sensor; and monitoring (204), by a monitoring device connected to the sensor, an excess of ampacity (A) by the current strength measured. The determining (100) of the ampacity (A) includes: selecting (108, 110, 112, 114, 116) a value of this ampacity (A) by optimizing a probability of exceeding the distribution temperature, with this probability defined based on a joint probability model (P) of operating current strength and temperature that depends on meteorological parameters; and recording (118) the selected ampacity value in a storage unit of the monitoring device.

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