Currents in series and parallel connections of small inner bore coils wound from Bi(2223)/Ag tapes and treated by the wind and react technique

1999 ◽  
Vol 12 (8) ◽  
pp. 507-513 ◽  
Author(s):  
P Kovác ◽  
L Cesnak ◽  
T Melisek ◽  
I Husek ◽  
P Bukva ◽  
...  
Keyword(s):  
In Series ◽  
Parallel Connections

scholarly journals Application of “PolySwitch” fuses for the limitation of current overloads in photovoltaic systems of solar arrays

2018 ◽  
Vol 26 (1) ◽  
pp. 77-82 ◽  
Author(s):  
A. V. Ivanchenko ◽  
A. S. Tonkoshkur ◽  
S. V. Mazurik
Keyword(s):  
Short Circuit ◽  
Electrical Energy ◽  
Complete Loss ◽  
Total Power ◽  
Photovoltaic Module ◽  
Photovoltaic Modules ◽  
Solar Arrays ◽  
Current Voltage ◽  
In Series ◽  
Parallel Connections

The results of experimental study of the transformation of the light current-voltage and volt-watt characteristics for the parallel connections of photovoltaic modules when using “PolySwitch” polymer resettable fuses are given. The conditions for selecting such fuses which allow their correctly triggering and minimize the current overload are formulated and experimentally verified. It is established that if resettable fuses are connected in series to the circuits of all photovoltaic modules, which are connected in parallel thus forming a unit, this prevents such a situation as the complete loss of electrical energy generated by this unit due to the short circuit of one of its modules. At the fuse triggering the total power loss of the unit of  parallelly connected photovoltaic modules is mainly determined by the decrease of its current by the amount that is equal to the current of the disconnected photovoltaic module.

The Mobility Method Applied to Mechanical Wave Filters With Inductive Coupling

1947 ◽  
Vol 14 (2) ◽  
pp. A143-A146
Author(s):  
Alice Winzer
Keyword(s):  
Inductive Coupling ◽  
Mechanical Wave ◽  
Pass Filter ◽  
High Pass Filter ◽  
In Series ◽  
Mobility Method ◽  
Parallel Connections ◽  
Mechanical Elements ◽  
Wave Filters ◽  
High Pass

Abstract This paper describes a new analysis of mechanical elements connected by inductive coupling as contrasted to series or parallel connections. The mobility method as applied to mechanical wave filters has been discussed before (1). In connection with the high-pass filter, the impossibility of putting masses in series arises. By use of the technique given in the following, high-pass filters may be constructed without any difficulty and, also, all other types of filters may be obtained.

The Piezoelectric Valve-Less Pump: Series and Parallel Connections

2014 ◽  
Vol 137 (2) ◽  
Author(s):  
Amos Ullmann ◽  
Yehuda Taitel
Keyword(s):  
Preferential Flow ◽  
Flow Direction ◽  
Open Circuit ◽  
Low Flow ◽  
Operational Conditions ◽  
Wide Range ◽  
Parallel Arrangement ◽  
In Series ◽  
Computational Fluid Dynamics Cfd ◽  
Parallel Connections

The piezoelectric valve-less pump is an attractive device to be used as a micropump for low flow rates. In these pumps, the nozzle/diffuser elements that have a preferential flow direction replace conventional valves, to direct the flow from the inlet to the outlet. This work is a study on the performance of such pumps when several of them (up to four) are combined for use in series and/or parallel arrangement. Two basic pumping configurations are considered: (a) pumping of fluid from low pressure to a higher pressure in an open circuit and (b) pumping of fluid in a closed circuit through a flow resistance. The performance analysis procedure developed is simple and quick and allows studying a wide range of operational conditions. Such an analysis is difficult to conduct using elaborate computational fluid dynamics (CFD) approach. The performance characteristics of the different combinations is reported and critically evaluated.

scholarly journals An electrical analogy for the Pentland Firth tidal stream power resource

2014 ◽  
Vol 470 (2161) ◽  
pp. 20130207 ◽  
Author(s):  
Scott Draper ◽  
Thomas A. A. Adcock ◽  
Alistair G. L. Borthwick ◽  
Guy T. Houlsby
Keyword(s):  
Predictive Model ◽  
Single Channel ◽  
Electrical Circuit ◽  
Stream Power ◽  
Tidal Power ◽  
Multiply Connected ◽  
Electrical Analogy ◽  
In Series ◽  
Circuit Analogy ◽  
Parallel Connections

Several locations in the Pentland Firth, UK, have been earmarked for the deployment of separate farms of tidal turbines. However, recent numerical modelling suggests that these farms will be inter-dependent and that they must work together to optimize their collective performance. To explain this inter-dependence, in this paper we develop an electrical circuit analogy to describe flow through the Pentland Firth, in which parallel connections in the circuit represent different sub-channels formed by the islands of Swona, Stroma and the Pentland Skerries. The analogy is introduced in stages, beginning with turbines placed in a single channel, then turbines placed in a sub-channel connected in parallel to another sub-channel, and finally more complicated arrangements, in which turbines are installed both in parallel and in series within a multiply connected channel. The analogy leads to a general formula to predict the tidal power potential of turbines placed in a sub-channel connected in parallel to another sub-channel, and a predictive model for more complicated multiply connected channel arrangements. Power estimates made using the formula and predictive model (which may be applied using only measurements of the undisturbed natural tidal hydrodynamics) are shown to agree well with numerical model predictions for the Pentland Firth, providing useful insight into how to best develop the resource.

scholarly journals Performance Analysis of Thermo Electric Generator using MATLAB

2019 ◽  
Vol 8 (4S2) ◽  
pp. 362-365
Keyword(s):  
Mathematical Model ◽  
Performance Analysis ◽  
Internal Resistance ◽  
Mathematical Equation ◽  
Thermo Electric ◽  
Electric Generator ◽  
Peak Energy ◽  
In Series ◽  
Parallel Connections ◽  
The Mathematical Model

In this paper discussed with the mathematical model of thermo electric generator. Designed each blocks based on mathematical equation and by using the equations they are connected and verified the output. The peak energy is achieved when the internal resistance of the TEG is equal to the resistance of the load. In order to increase the existing transport,voltage carrying and power rating the thermo electric generators are connected in series, parallel or series -parallel connections. The mathematical model is simulated in matlab and the results are verified.

THE RESPONSE OF SEISMOMETERS IN SERIES AND PARALLEL CONNECTIONS

Geophysics ◽  
1959 ◽  
Vol 24 (1) ◽  
pp. 49-63
Author(s):  
A. J. Seriff
Keyword(s):  
Normal Modes ◽  
Angular Frequency ◽  
Open Circuit ◽  
Harmonic Oscillators ◽  
Sustained Oscillation ◽  
Small Current ◽  
Adjacent Pair ◽  
Second Mode ◽  
In Series ◽  
Parallel Connections

Two similar seismometers connected in series with a load exhibit two independent or “normal” modes of motion. In the first mode the two coils move so that the voltages generated are almost equal and in phase, producing a large current in the circuit and considerable damping of the motion. This is the mode normally considered in designing the external damping circuit for series seismometers. In the second mode the coils move nearly 180° out of phase, produce a relatively small current in the circuit, and, consequently, experience very little damping in addition to their open circuit damping. Strong initial excitation of this mode can produce a sustained oscillation damaging to later parts of the seismic record. The usual mathematical description of this system, i.e., two harmonic oscillators coupled through their damping terms, readily yields approximate expressions for the size and damping of the load current in the case of nearly identical seismometers with little internal damping. For example, two such seismometers connected to a load producing large damping for the first mode will exhibit a damping of only [Formula: see text] in the second mode. Here [Formula: see text] and [Formula: see text] are the angular frequencies of the two separate seismometers, ω is the average angular frequency, and f is the fraction of critical damping for the first mode. Two seismometers connected in parallel can have considerable electromagnetic damping in both modes of oscillation. For n seismometers in series, there are n−1 modes which may be poorly damped. The frequencies of these modes are distributed so that one lies between each adjacent pair of the original uncoupled frequencies. The damping in each mode is of the order of [Formula: see text]. The steady‐state characteristic can be readily examined using the seismometer equivalent circuits. The result is strongly dependent on the mode of excitation. For example, if two similar seismometers are connected in series but only one is excited, the frequency characteristic shows both a maximum near the rms of the two seismometer frequencies and a minimum at the frequency of the seismometer not excited.

scholarly journals An Analysis of the Stacking Potential and Efficiency of Plant-Microbial Fuel Cells Growing Green Beans (Vigna ungiculata ssp. sesquipedalis)

2020 ◽  
Vol 9 (3) ◽  
pp. 439-447
Author(s):  
Kristopher Ray Simbulan Pamintuan ◽  
Angelika Michelle C. Katipunan ◽  
Patricia Ann O. Palaganas ◽  
Alvin R. Caparanga
Keyword(s):  
Power Density ◽  
Power Output ◽  
Microbial Fuel Cells ◽  
Bioelectrochemical System ◽  
Green Beans ◽  
Power Amplification ◽  
Carbon Fiber Electrodes ◽  
In Series ◽  
The Common ◽  
Parallel Connections

Plant-Microbial Fuel Cell (PMFC) technology is a promising bioelectrochemical system that can exploit natural plant rhizodeposition to generate electricity. PMFCs can be used to simultaneously generate electricity while growing edible plants, as illustrated in this study. However, the common problem encountered for soil PMFCs is the low power output. To solve this problem, the stacking behavior of PMFCs was examined to maximize the power output of several cells. A grid of 9 PMFCs (3x3) was constructed with stainless steel and carbon fiber electrodes growing green beans (V. ungiculata spp. sesquipedalis) for stacking purposes. Stacking results have shown that too many cells connected in series will result in voltage losses, while stacking in parallel conserves voltage between cells. Stacking a maximum of 3 cells in series is acceptable based on the results, since cumulative stacking revealed that voltage reversals can reduce the overall potential of the stack if there are too many connected cells. Stack combinations were also tested, resulting in an enhanced performance upon combining series and parallel connections allowing power to be amplified and power density to be conserved. The combination of three sets of three cells in series stacked in parallel (3S-P) generated the highest power and power density (160.86 μW/m2) amongst all combinations, showing that power amplification without losses to power density are possible in PMFC stacking. Overall, proper stacking combinations have been shown to greatly affect the performance of PMFCs. It is hoped that the results of this study will contribute to the efforts of applying PMFC technology on a larger scale.©2020. CBIORE-IJRED. All rights reserved

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