scholarly journals Room Return Path Sensitivity

2021 ◽  
Author(s):  
Andrew Poerschke
Keyword(s):  
Return Path

scholarly journals Modeling of German Low Voltage Cables with Ground Return Path

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1265 ◽  
Author(s):  
Johanna Geis-Schroer ◽  
Sebastian Hubschneider ◽  
Lukas Held ◽  
Frederik Gielnik ◽  
Michael Armbruster ◽  
...  
Keyword(s):  
Low Voltage ◽  
Measurement Data ◽  
Analytical Calculation ◽  
Laboratory Measurement ◽  
Model Parameters ◽  
Calculation Methods ◽  
Modeling Approach ◽  
Measurement Results ◽  
Simulation Results ◽  
Return Path

In this contribution, measurement data of phase, neutral, and ground currents from real low voltage (LV) feeders in Germany is presented and analyzed. The data obtained is used to review and evaluate common modeling approaches for LV systems. An alternative modeling approach for detailed cable and ground modeling, which allows for the consideration of typical German LV earthing conditions and asymmetrical cable design, is proposed. Further, analytical calculation methods for model parameters are described and compared to laboratory measurement results of real LV cables. The models are then evaluated in terms of parameter sensitivity and parameter relevance, focusing on the influence of conventionally performed simplifications, such as neglecting house junction cables, shunt admittances, or temperature dependencies. By comparing measurement data from a real LV feeder to simulation results, the proposed modeling approach is validated.

Material Handling Throughput Using a Track Based Multihead Robot

Manufacturing ◽  
2002 ◽  
Author(s):  
Stephen J. Derby ◽  
John McFadden
Keyword(s):  
Control System ◽  
Distributed Control ◽  
Material Handling ◽  
Closed Loop ◽  
Distributed Control System ◽  
System Configuration ◽  
Drive Chain ◽  
Return Path ◽  
Loop Track

A novel closed loop track based multi-head robot has been developed to increase material handing throughput. This robot allows for waves of robot heads to move materials in the working path by eliminating the traditional return path. Programmable clutching of a constant moving drive chain supplies the source of motion around the loop. This paper discusses the design and impact of such a system configuration, and looks at the required distributed control system.

scholarly journals An Equivalent Circuit for the Evaluation of Cross-Country Fault Currents in Medium Voltage (MV) Distribution Networks

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1929 ◽  
Author(s):  
Fabio Gatta ◽  
Alberto Geri ◽  
Stefano Lauria ◽  
Marco Maccioni
Keyword(s):  
Distribution Networks ◽  
General Purpose ◽  
Simultaneous Occurrence ◽  
Medium Voltage ◽  
Electromagnetic Transient ◽  
High Impedance ◽  
Fault Currents ◽  
Cross Country ◽  
Return Path

A Cross-Country Fault (CCF) is the simultaneous occurrence of a couple of Line-to-Ground Faults (LGFs), affecting different phases of same feeder or of two distinct ones, at different fault locations. CCFs are not uncommon in medium voltage (MV) public distribution networks operated with ungrounded or high-impedance neutral: despite the relatively small value of LGF current that is typical of such networks, CCF currents can be comparable to those that are found in Phase-To-Phase Faults, if the affected feeder(s) consists of cables. This occurs because the faulted cables’ sheaths/screens provide a continuous, relatively low-impedance metallic return path to the fault currents. An accurate evaluation is in order, since the resulting current magnitudes can overheat sheaths/screens, endangering cable joints and other plastic sheaths. Such evaluation, however, requires the modeling of the whole MV network in the phase domain, simulating cable screens and their connections to the primary and secondary substation earth electrodes by suitable computer programs, such as ATP (which is the acronym for alternative transient program) or EMTP (the acronym for electromagnetic transient program), with substantial input data being involved. This paper presents a simplified yet accurate circuit model of the faulted MV network, taking into account the CCF currents’ return path (cable sheaths/screens, ground conductors, and earthing resistances of secondary substations). The proposed CCF model can be implemented in a general-purpose simulation program, and it yields accurate fault currents estimates: for a 20 kV network case study, the comparison with accurate ATP simulations evidences mismatches mostly smaller than 2%, and never exceeding 5%.

scholarly journals A Low-Flicker-Noise 30-GHz Class-F23 Oscillator in 28-nm CMOS Using Implicit Resonance and Explicit Common-Mode Return Path

2018 ◽  
Vol 53 (7) ◽  
pp. 1977-1987 ◽  
Author(s):  
Yizhe Hu ◽  
Teerachot Siriburanon ◽  
Robert Bogdan Staszewski
Keyword(s):  
Flicker Noise ◽  
Common Mode ◽  
Return Path ◽  
28 Nm

scholarly journals Internal Current Return Path for Ground Leakage Current Mitigation in Current Source Inverters

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 96540-96548 ◽  
Author(s):  
Emilio Lorenzani ◽  
Giovanni Migliazza ◽  
Fabio Immovilli ◽  
Chris Gerada ◽  
He Zhang ◽  
...  
Keyword(s):  
Leakage Current ◽  
Current Source ◽  
Return Path ◽  
Current Source Inverters ◽  
Current Return

Distributed Control of a Track Based Multi-Head Robot

2002 ◽  
Author(s):  
Stephen J. Derby ◽  
David Brown
Keyword(s):  
Distributed Control ◽  
Closed Loop ◽  
Autonomous Robot ◽  
Control Architecture ◽  
Infrared Communications ◽  
Return Path ◽  
Loop Track

A novel closed loop track based multi-head robot has been developed to increase material handing throughput. This robot allows for waves of autonomous robot heads to move materials in the working path by eliminating the traditional return path. Distributed control architecture was developed using a system comprising of desktop, embedded and single board PC’s, some linked by infrared communications. This paper discusses the design and impact of such a control architecture, and looks at some performance boundaries.

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