Experimental results from short-circuit faults on a distribution transformer

2002 ◽  
Author(s):  
K.L. Butler ◽  
A. Kuforiji
Keyword(s):  
Short Circuit ◽  
Experimental Results ◽  
Distribution Transformer

scholarly journals Influence of Waterproof Films on the Atomization Behavior of Surface Acoustic Waves

Micromachines ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 794 ◽  
Author(s):  
Huang ◽  
Hu ◽  
Han ◽  
Lei ◽  
Yang
Keyword(s):  
Acoustic Wave ◽  
Surface Acoustic Wave ◽  
Acoustic Waves ◽  
Short Circuit ◽  
Surface Acoustic Waves ◽  
Film Coating ◽  
Experimental Results ◽  
Commercial Application

One of the reasons why commercial application of surface acoustic wave (SAW) atomization is not possible is due to the condensation of aerosol droplets generated during atomization, which drip on the interdigitated transducer (IDT), thereby causing electrodes to short-circuit. In order to solve this problem, a SU-8-2002 film coating on an IDT is proposed in this paper. The waterproof performance of the film coating was tested on a surface acoustic wave (SAW) device several times. The experimental results reveal that the film coating was robust. The experiment also investigated the effects of the SU-8-2002 film on atomization behavior and heating.

Verification of Fault Control Measures Based on Fault Injection for MCU Control System

2014 ◽  
Vol 484-485 ◽  
pp. 325-331
Author(s):  
Dao Sen Niu ◽  
Xiao Dong Liu ◽  
Shou Qun Sun ◽  
Yang Liu
Keyword(s):  
Control System ◽  
Fault Diagnosis ◽  
Fault Injection ◽  
Short Circuit ◽  
Experimental Results ◽  
Control Measures ◽  
Level Variation ◽  
Software Fault ◽  
Hardware Faults ◽  
Software Measures

To verify the validity of fault control measures, a verification platform with software fault injection and hardware fault injection is developed to conduct fault diagnosis measures for MCU control system. For the faults occurring in the internal units of a controller, program debugger is employed to simulate software or hardware faults by varying the data; for the faults occurring in peripheral circuits, a circuit of fault-settings is employed to simulate hardware faults, i.e., open-/short-circuit and electrical level variation. This verification platform is applied to evaluate software measures to control the faults/errors in accordance with IEC60335/IEC60730/UL1998/CSA22.2.08, and a case of induction cooker is presented shows how it works. Experimental results show that the verification platform runs stably and accurately, and has a big value in practice.

scholarly journals RESEARCH ON SHORT-CIRCUIT IMPEDANCES OF NEW CONVERTER TRANSFORMER

2020 ◽  
Vol 38 (02) ◽  
Author(s):  
TRAN THANH NGOC
Keyword(s):  
Theoretical Analysis ◽  
Topological Structure ◽  
Short Circuit ◽  
Experimental Results ◽  
New Method ◽  
Mathematical Relationship ◽  
Hvdc System ◽  
Grid Side ◽  
Relationship Of ◽  
Circuit Impedance

The short-circuit impedance of converter transformers is one of the most important specifications in HVDC system. Compared with the traditional converter transformers, the new converter transformer has unique windings connection diagrams. Based on the topological structure of the new converter transformer, this paper proposes a new method to establish the mathematical relationship of short-circuit impedances and filters impedances under considering the valve side and grid side shortcircuit conditions. The analysis on short circuit at valve side and grid side shows that short-circuit impedances values are almost the same in both two conditions, so that the impedance of the new converter transformer is symmetrical. Finally, simulation and experimental results verify the correctness of the theoretical analysis.

scholarly journals Impacts of Placement of Wind Turbine Generators on IEEE 13 Node Radial Test Feeder In-Line Transformer Fuse-Fuse Protection Coordination

2020 ◽  
Vol 5 (6) ◽  
pp. 665-674
Author(s):  
Kemei Peter Kirui ◽  
David K. Murage ◽  
Peter K. Kihato
Keyword(s):  
Power System ◽  
Short Circuit ◽  
Electrical Power ◽  
Distribution Network ◽  
Electrical Energy ◽  
Distribution Transformer ◽  
Electrical Power System ◽  
Turbine Generators ◽  
Wind Turbine Generators ◽  
Network Operations

The ever increasing global demand on the electrical energy has lead to the integration of Distributed Generators (DGs) onto the distribution power systems networks to supplement on the deficiencies on the electrical energy generation capacities. The high penetration levels of DGs on the electrical distribution networks experienced over the past decade calls for the grid operators to periodically and critically asses the impacts brought by the DGs on the distribution network operations. The assessment on the impacts brought by the DGs on the distribution network operations is done by simulating the dynamic response of the network to major disturbances occurring on the network like the faults once the DGs have been connected into it. Connection of Wind Turbine Generators (WTGs) into a conventional electrical energy distribution network has great impacts on the short circuit current levels experienced during a fault and also on the protective devices used in protecting the distribution network equipment namely; the transformers, the overhead distribution lines, the underground cables and the line compensators and the shunt capacitors commonly used/found on the relatively long rural distribution feeders. The main factors which contribute to the impacts brought by the WTGs integration onto a conventional distribution network are: The location of interconnecting the WTG/s into the distribution feeder; The size/s of the WTG/s in terms of their electrical wattage penetrating the distribution network; And the type of the WTG interfacing technology used labeled/classified as, Type I, Type II, Type III and Type IV WTGs. Even though transformers are the simplest and the most reliable devices in an electrical power system, transformer failures can occur due to internal or external conditions that make the transformer incapable of performing its proper functions. Appropriate transformer protection should be used with the objectives of protecting the electrical power system in case of a transformer failure and also to protect the transformer itself from the power system disturbances like the faults. This paper was to investigate the effects of integrating WTGs on a distribution transformer Fuse-Fuse conventional protection coordination scheme. The radial distribution feeder studied was the IEEE 13 node radial test feeder and it was simulated using the Electrical Transient Analysis Program (ETAP) software for distribution transformer Fuse-Fuse protection coordination analysis. The IEEE 13 Node radial test feeder In-line transformer studied is a three-phase  step down transformer having a star solidly grounded primary winding supplied at  and a star solidly grounded secondary winding feeding power at a voltage of . The increase on the short circuit currents at the In-line transformer nodes due to the WTG integration continuously reduces the time coordination margins between the upstream fuse F633 and the downstream fuse F634 used to protect the transformer.

High temperature anti short circuit function for normally-on SiC JFET in an inverter leg configuration

2012 ◽  
Vol 2012 (HITEC) ◽  
pp. 000087-000092
Author(s):  
Khalil El Falahi ◽  
Luong Viêt Phung ◽  
Bruno Allard ◽  
Dominique Bergogne ◽  
Fabien Dubois
Keyword(s):  
High Temperature ◽  
Temperature Effects ◽  
Short Circuit ◽  
Hybrid Vehicle ◽  
Experimental Results ◽  
Output Current ◽  
Safety Function ◽  
Specific Safety ◽  
Circuit Function ◽  
Soi Cmos

The SiC JFET is commercially available as a normally-on device. In an inverter leg configuration, many temperature effects must be compensated. Moreover, specific safety functions have to be implemented and the JFET drivers are generally the best locations to implement latter requirements. The paper describes experimental results about a SOI CMOS core driver operated up to 250°C. Particularly, an option is presented to compensate for the decrease in the driver output current with temperature. It is also demonstrated primary results of the integration of an anti short-circuit solution previously verified as a hybrid vehicle. It is shown that the reactivity of the safety function is reduced to less than 5μs at 250°C compared to 100μs in earlier vehicle at 200°C.

The Economic Operation of Common Coupling Groups of Distribution Transformer

2014 ◽  
Vol 521 ◽  
pp. 288-291
Author(s):  
Yu Sheng Quan ◽  
Xin Zhao ◽  
Hua Gui Chen ◽  
En Ze Zhou
Keyword(s):  
Single Phase ◽  
Short Circuit ◽  
Phase System ◽  
Distribution Transformer ◽  
Three Phase ◽  
Unbalanced Load ◽  
Transformer Coupling ◽  
The Difference ◽  
Short Circuit Fault ◽  
Better Than

Based on the method of symmetrical components of D, 11 and Y, o distribution transformer coupling two different effects of different magnetic circuit coupled to the three-phase system with a system-generated analysis and comparison. Analysis of the difference between the two groups of different connections on the transformer structure. Described in the single-phase short circuit fault clearing, 3n harmonic current suppression and affordability aspects of single-phase unbalanced load, D, ll coupling transformers are significantly better than Y,0 coupling transformer. This has necessarily important for the study of energy loss reduction.

Quantum Efficiency of Textured a-Si:H P-I-N Solar Cells After High Intensity Light-Soaking

1992 ◽  
Vol 258 ◽  
Author(s):  
X. R. Li ◽  
S. Wagner ◽  
M. Bennett ◽  
S. J. Fonash
Keyword(s):  
Solar Cells ◽  
Light Intensity ◽  
Quantum Efficiency ◽  
White Light ◽  
High Intensity ◽  
Short Circuit ◽  
Experimental Results ◽  
Intensity Dependence ◽  
High Intensity Light

ABSTRACTWe studied the effect of high-intensity light-soaking on the quantum efficiency spectrum of textured a-Si:H solar cells. We report experimental results on the time, temperature, and soaking light intensity dependence of the quantum efficiency (QE) measured in short circuit. Under 3Wcm-2 of white light the QE saturates after 30 minutes. The QE decays little in the blue and strongly in the red. The higher the temperature of saturation, the smaller the decay of the QE.

scholarly journals Power electrical network topology detection using changes of phasor measurements in transient states

2019 ◽  
Vol 139 ◽  
pp. 01063
Author(s):  
Natalja Gotman ◽  
Galina Shumilova
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Network Topology ◽  
Short Circuit ◽  
Transient State ◽  
Test System ◽  
Experimental Results ◽  
Electrical Network ◽  
Phasor Measurements ◽  
Measurement Units

The solution of the problem of a topology detection of an electrical network on changing voltage and current phasors obtained from the phasor measurement units (PMUs) in a transient state using artificial neural networks (ANNs) is considered. Experimental results for the 14-bus test system to detect the failed line after short circuit and the line was turned on by an auto-reclosing device are presented.

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