Browsing by Keyword "Field tests"
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Item Performance of PLC communications in frequency bands from 150 kHz to 500 kHz(Institute of Electrical and Electronics Engineers Inc., 2017-04-11) Arechalde, Ibon; Castro, Marta; Garcia-Borreguero, Ibone; Sendín, Alberto; Urrutia, Iker; Fernandez, Ainara; Tecnalia Research & Innovation; Generales; Datos y ProtocolosOne of the most common communications technologies being used as the media to access the meters in Smart Metering deployments is Narrowband Power Line Communications (NB-PLC), mainly in Europe but also in other places. Most of the systems available in the market under NB-PLC are extending the frequency bands used in order to increase their bandwidth and avoid interferences from other devices in the network. This paper presents results obtained in real-field tests performed by Iberdrola and Tecnalia in an urban LV distribution network representative of this kind of installations in Europe. The objective of the tests is to verify the performance of a NB-PLC technology using frequency bands from 150 kHz to 500 kHz. The tests have been developed in several points of the same LV distribution network, checking point to point connections among them. Apart from the performance of the different links, the noise levels measured at the reception points have been also analyzed.Item Soil Stabilization with Calcined Paper Sludge: Laboratory and Field Tests(2012-06-04) Lisbona, Amaia; Vegas, Iñigo; Ainchil, Javier; Ríos, Carolina; Tecnalia Research & Innovation; GENERALTwo investigative stages are presented in this study, which aim to establish basic standards for the use of calcined paper sludge (CPS) in the stabilization of soils. The soils were stabilized with CPS and with mixtures of CPS and cement (C). The total percentage of binder was between 3 and 6% by weight. The blending ratios (by weight) of the CPS:C mixtures were 50:50 and 25:75. The first stage took place in the laboratory, and the second stage, in the field, involved in situ stabilization of 250 m of subgrade using dry-mix methods. The bearing capacity of the stabilized soils was determined in the laboratory. In the second stage, the densities of the subgrade were measured in the field following compaction and deflections at 7 days. Furthermore, the evolution of its unconfined compressive strength (UCS) was measured over 90 days. The results reveal optimal mechanical behavior of the stabilized soil at CPS:C ratios of approximately 25:75.