scholarly journals The next generation leased line telecommunication protection for high voltage substation

2021 ◽  
Author(s):  
Murad Hussain
Keyword(s):  
Control System ◽  
High Voltage ◽  
Next Generation ◽  
Protection Scheme ◽  
Generation Plant ◽  
Generation Company ◽  
Zone Of Influence ◽  
Minor Flaw ◽  
A Minor

Telecommunication circuits and leased lines have been in use for controlling substations for many years. These circuits have usually been engineered according to set standards however recent studies have shown that the parameters used for engineering the telecommunication circuits have various design flaws that may put these circuits. in jeopardy during a local substation fault. The existing protection scheme for SolarI wind and other relevant power generating farms are such that if they lose communication with the local Utility Transmission Station (UTS)I the UTS automatically trips a local breaker and knocks the generation plant off the grid this could mean thousands of dollars in lost revenue for the generation company hence even a minor flaw in the telecommunication circuits can have a significant impact on the substation control system. This case study reviews the challenges of designing these telecommunication circuits for control and monitoring of substations and also reviews the case study performed by Hydro Quebec on the concept of Zone of Influence. In addition this study also proposes an alternate telecommunication model that when implemented will be able to withstand all the challenges of designing a circuits for the high voltage substation.

scholarly journals The next generation leased line telecommunication protection for high voltage substation

2021 ◽  
Author(s):  
Murad Hussain
Keyword(s):  
Control System ◽  
High Voltage ◽  
Next Generation ◽  
Protection Scheme ◽  
Generation Plant ◽  
Generation Company ◽  
Zone Of Influence ◽  
Minor Flaw ◽  
A Minor

Telecommunication circuits and leased lines have been in use for controlling substations for many years. These circuits have usually been engineered according to set standards however recent studies have shown that the parameters used for engineering the telecommunication circuits have various design flaws that may put these circuits. in jeopardy during a local substation fault. The existing protection scheme for SolarI wind and other relevant power generating farms are such that if they lose communication with the local Utility Transmission Station (UTS)I the UTS automatically trips a local breaker and knocks the generation plant off the grid this could mean thousands of dollars in lost revenue for the generation company hence even a minor flaw in the telecommunication circuits can have a significant impact on the substation control system. This case study reviews the challenges of designing these telecommunication circuits for control and monitoring of substations and also reviews the case study performed by Hydro Quebec on the concept of Zone of Influence. In addition this study also proposes an alternate telecommunication model that when implemented will be able to withstand all the challenges of designing a circuits for the high voltage substation.

Tuning Transition Metal Carbides Activity by Surface Metal Alloying: Case Study on CO2 Capture and Activation

2018 ◽  
Author(s):  
Marti Lopez ◽  
Luke Broderick ◽  
John J Carey ◽  
Francesc Vines ◽  
Michael Nolan ◽  
...  
Keyword(s):  
Transition Metal ◽  
Co2 Capture ◽  
Density Functional ◽  
Deep Understanding ◽  
Metal Carbides ◽  
Transition Metal Carbides ◽  
Adsorption Sites ◽  
Surface Metal ◽  
A Minor

<div>CO2 is one of the main actors in the greenhouse effect and its removal from the atmosphere is becoming an urgent need. Thus, CO2 capture and storage (CCS) and CO2 capture and usage (CCU) technologies are intensively investigated as technologies to decrease the concentration</div><div>of atmospheric CO2. Both CCS and CCU require appropriate materials to adsorb/release and adsorb/activate CO2, respectively. Recently, it has been theoretically and experimentally shown that transition metal carbides (TMC) are able to capture, store, and activate CO2. To further improve the adsorption capacity of these materials, a deep understanding of the atomic level processes involved is essential. In the present work, we theoretically investigate the possible effects of surface metal doping of these TMCs by taking TiC as a textbook case and Cr, Hf, Mo, Nb, Ta, V, W, and Zr as dopants. Using periodic slab models with large</div><div>supercells and state-of-the-art density functional theory based calculations we show that CO2 adsorption is enhanced by doping with metals down a group but worsened along the d series. Adsorption sites, dispersion and coverage appear to play a minor, secondary constant effect. The dopant-induced adsorption enhancement is highly biased by the charge rearrangement at the surface. In all cases, CO2 activation is found but doping can shift the desorption temperature by up to 135 K.</div>

scholarly journals Analysis of the System of Controlling Paid Parking Zones

2021 ◽  
Vol 13 (8) ◽  
pp. 4211
Author(s):  
Maciej Kozłowski ◽  
Andrzej Czerepicki ◽  
Piotr Jaskowski ◽  
Kamil Aniszewski
Keyword(s):  
Control System ◽  
Smart City ◽  
Measurement Errors ◽  
Fundamental Problem ◽  
Urban Traffic ◽  
Statistical Dependence ◽  
Actual State ◽  
Event Time ◽  
Operational Data

Urban traffic can be curbed in various ways, for instance, by introducing paid unguarded parking zones (PUPZ). The operational functionality of this system depends on whether or not the various system features used to document parking cases function properly, including those which enable positioning of vehicles parked in the PUPZ, recognition of plate numbers, event time recording, and the correct anonymisation of persons and other vehicles. The most fundamental problem of this system is its reliability, understood as the conformity of control results with the actual state of matters. This characteristic can be studied empirically, and this article addresses the methodology proposed for such an examination, discussed against a case study. The authors have analysed the statistical dependence of the e-control system’s measurement errors based on operational data. The results of this analysis confirm the rationale behind the deployment of the e-control system under the implementation of the smart city concept in Warsaw.

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