Experimental results of parallel connected inverters feeding medium voltage transformer

2017 ◽  
pp. 359-368 ◽  
Author(s):  
Maciej Kozak
Keyword(s):  
Experimental Results ◽  
Voltage Transformer ◽  
Medium Voltage ◽  
Feeding Medium

scholarly journals Microcontroller Based Flexible Modulation Scheme of MLI Operation for Selective Lower Levels: A Knowledge Based Approach

2016 ◽  
Vol 2016 ◽  
pp. 1-11
Author(s):  
R. K. Dhatrak ◽  
R. K. Nema ◽  
D. M. Deshpande
Keyword(s):  
Pulse Generation ◽  
Multilevel Inverter ◽  
Experimental Results ◽  
Modulation Scheme ◽  
Inductive Load ◽  
Medium Voltage ◽  
Knowledge Based ◽  
Common Mode Voltage ◽  
Power Modules ◽  
And Performance

In today’s industrial world multilevel inverter (MLI) got a significant importance in medium voltage application and also a very potential topic for researchers. It is experienced that studying and comparing results of multilevel inverter (MLI) at distinct levels are a costlier and time consuming issue for any researcher if he fabricate different inverters for each level, as designing power modules simultaneously for different level is a cumbersome task. In this paper a flexible quotient has been proposed to recognize possible conversion of available MLI to few lower level inverters by appropriately changing microcontroller programming. This is an attempt to obtain such change in levels through simulation using MATLAB Simulink on inductive load which may also be applied to induction motor. Experimental results of pulse generation using dsPIC33EP256MC202 demonstrate the feasibility of proposed scheme. Proposed flexible quotient successfully demonstrates that a five-level inverter may be operated as three and two levels also. The paper focuses on odd levels only as common mode voltage (CMV) can be reduced to zero and performance of drives is better than even level. Simulated and experimental results are given in paper.

Interruption of small, medium-voltage transformer current with a vacuum circuit breaker

2020 ◽  
Vol 187 ◽  
pp. 106502
Author(s):  
Alain Xemard ◽  
Bruno Jurisic ◽  
Michel Rioual ◽  
Arthur Olivier ◽  
Eric Sellin
Keyword(s):  
Circuit Breaker ◽  
Voltage Transformer ◽  
Medium Voltage ◽  
Vacuum Circuit Breaker

Narrowband power line communication: Medium voltage cable modeling and laboratory experimental results

2013 ◽  
Vol 102 ◽  
pp. 50-60 ◽  
Author(s):  
Theofilos A. Papadopoulos ◽  
Andreas I. Chrysochos ◽  
Grigoris K. Papagiannis
Keyword(s):  
Power Line ◽  
Experimental Results ◽  
Power Line Communication ◽  
Communication Medium ◽  
Medium Voltage

scholarly journals Leak Current Monitoring System On The Ground Cables Medium Voltage Transformer 150/20 kV

2018 ◽  
Vol 218 ◽  
pp. 01008
Author(s):  
A. Sofwan ◽  
A. Multi ◽  
R. Soleman ◽  
Sugianto ◽  
A.Kusuma Septian
Keyword(s):  
Leakage Current ◽  
Short Circuit ◽  
Electrical Power ◽  
Voltage Transformer ◽  
Power Outage ◽  
Thermal Failure ◽  
Protection Relay ◽  
Medium Voltage ◽  
Current Monitoring ◽  
T Phase

On January, 2017 there had been fault trip at PMT 150/20 kV transformer in Jatirangon substation. For fault detection, that rele differential phase T and REF 20 kV have worked to detect this fault. The resulted impact of this fault is Power outage in feeder a 1350 A, 35 MW and 5 Mvar. The cause of this fault is the occurrence of breakdown on ground cables 20kV T-phase-core 1. This results in a short circuit to the ground so that the differential protection relay and REF 20kV work because the relay detects a fault in the ptotection zone. The result of this research is the design of an early detection monitoring tool. This tool is used to determine the amount of leakage current on the ground cable in order to minimize the occurrence of interference that causes the occurrence of electrical power outage. The result of the leakage current monitor on the ground phase cable T obtained a current of 0.6A with temperature 35 °C. With thermal failure calculation method for leakage current obtained result of 0,56180A with temperature 35 °C. Comparison of the calculation with the measurement of leakage current on the ground cable T phase is obtained at 6.36%.

scholarly journals Application of Machine Learning in Transformer Health Index Prediction

Energies ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2694 ◽  
Author(s):  
Alhaytham Alqudsi ◽  
Ayman El-Hag
Keyword(s):  
Machine Learning ◽  
Pattern Recognition ◽  
Prediction Models ◽  
Health Condition ◽  
Test Results ◽  
Health Index ◽  
Voltage Transformer ◽  
Gulf Region ◽  
Strong Basis ◽  
Medium Voltage

The presented paper aims to establish a strong basis for utilizing machine learning (ML) towards the prediction of the overall insulation health condition of medium voltage distribution transformers based on their oil test results. To validate the presented approach, the ML algorithms were tested on two databases of more than 1000 medium voltage transformer oil samples of ratings in the order of tens of MVA. The oil test results were acquired from in-service transformers (during oil sampling time) of two different utility companies in the gulf region. The illustrated procedure aimed to mimic a realistic scenario of how the utility would benefit from the use of different ML tools towards understanding the insulation health index of their transformers. This objective was achieved using two procedural steps. In the first step, three different data training and testing scenarios were used with several pattern recognition tools for classifying the transformer health condition based on the full set of input test features. In the second step, the same pattern recognition tools were used along with the three training/testing scenarios for a reduced number of test features. Also, a previously developed reduced model was the basis to reduce the needed number of tests for transformer health index calculations. It was found that reducing the number of tests did not influence the accuracy of the ML prediction models, which is considered as a significant advantage in terms of transformer asset management (TAM) cost reduction.

scholarly journals Integrated Solution for Driving Series-Connected IGBTs and Its Natural Intrinsic Balancing

Energies ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2406
Author(s):  
Gustavo O. Fortes ◽  
Marcos A. S. Mendes ◽  
Porfírio C. Cortizo
Keyword(s):  
Low Voltage ◽  
Low Cost ◽  
Operating Conditions ◽  
Experimental Results ◽  
Commercial Products ◽  
Lower Power ◽  
Medium Voltage ◽  
A Current

The use of series connected IGBTs is still a current subject in literature, despite such a discussion having started in the 1990s. Though countless academic studies, there are currently no available commercial products on the market for medium voltage inverters (up to 4.16 kV) and lower power (up to 1 MW) using this technology. This is related to the difficulty of ensuring the dynamic and static voltage sharing between IGBTs, giving rise to relatively expensive and complex firing circuits, when compared to the components they intend to control. Therefore, this article aims to present a simple and low-cost alternative, still effective for driving low voltage series-connected IGBTs, specifically for the encapsulation TO-247 type. Experimental results are presented showing the behavior of the solution under several operating conditions.

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