Modelling and Simulation of Transformer Tests under Dynamic Testing

2021 ◽  
pp. 8-16
Author(s):  
Ramesh Kumar Patel ◽  
Madhu Upadhyay
Keyword(s):  
Dynamic Testing ◽  
Short Circuit ◽  
The Other ◽  
Power Transformers ◽  
High Current ◽  
Large Power ◽  
Parameter Evaluation ◽  
Economic Functioning ◽  
The Impact ◽  
Grid Based

Large power transformers are the most important equipment for the power grid. Their reliability not only affects the availability of electricity in the supply area, but also affects the economic functioning of an energy supplier. The main objective of this work of the development of the transformer testing simulation model on the MATLAB/SIMULINK environment. The designing aspect shall comprise the generator-based and grid-based testing of the transformer and associated results on the same in the SIMULINK. And the methodology shall study the impacts on the grid-connected devices due to testing of the transformers in the grid-based method. The study concluded that there is effectively no effect on the parameter evaluation of OC and SC tests by either source. However, the practical conditions would require grid-based testing that allows a greater range of transformers of various ratings to be tested with high current capability. The impact of fault on the grid can be easily evaluated through location of fault, duration of fault, and dip if occurred. The testing should follow proper timing to avoid such disturbances on the grid. This leads to the rescheduling of the other approved outages or Short Circuit tests.

scholarly journals Designing and Simulating Transformer Experiments under Dynamic Experiments

2021 ◽  
pp. 22-31
Author(s):  
Ramesh Kumar Patel ◽  
Madhu Upadhyay
Keyword(s):  
Short Circuit ◽  
Open Circuit ◽  
The Other ◽  
Power Transformers ◽  
Matlab Simulink ◽  
Parameter Calculation ◽  
Other Hand ◽  
Dynamic Experiments ◽  
Energy Provider

Enormous power transformers are the main gear for the power lattice. Their dependability not just influences the accessibility of power in the inventory region, yet in addition influences the monetary working of an energy provider. The primary goal of this work of the improvement of the transformer testing simulating model on the MATLAB/SIMULINK climate.The testing which depends on generator and grid of the transformer, as well as the related outcomes in SIMULINK, will be part of the conceptual stage. In addition, the technique will look into the effects of transformer validation in the method relying on grid on devices which are connected to the grids. According to the findings, neither source has an impact on the parameter calculation of Open Circuit and Short Circuit assessments. Realistic situations, on the other hand, would necessitate testing which relies on grid, which would enable a broader variety of transformers of different ratings to be evaluated with increased current capacity. The effect of a mistake on the grid can be quickly assessed by looking at the destination of the mistake, the period of the mistake, and any dips that may have took place.

An Innovative Solution for Type Testing of Power Transformers

2019 ◽  
Vol 20 (1) ◽  
Author(s):  
Manohar Singh ◽  
Vishnuvarddhan Telukanta ◽  
K S Meera
Keyword(s):  
Power Transformer ◽  
Short Circuit ◽  
Operating Conditions ◽  
Power Transformers ◽  
Test Facility ◽  
Online Testing ◽  
Testing Laboratory ◽  
Power Testing ◽  
Grid Operation ◽  
The Impact

Abstract Type tests are essential to assess the short circuit withstand capabilities of transformer windings. The mechanical durability of power equipment are checked against the mechanical forces developed during making/breaking short circuit operations. These type tests are generally carried out in indoor transformer test laboratories. Testing of Power Transformer for size more than 200 MVA in 765/400 kV voltage class in an indoor laboratory is not economically feasible. Now a days, power transformer manufacturers are fabricating single phase auto- power transformers of size up to 630 megawatt volt ampere (MVA) rating. Type testing of these transformers in indoor laboratories is not feasible. In view of this, strong short circuit fault feeding capabilities of the national grids can be utilized for type testing of these power transformers in an online manner. However, this may affect the grid operation/control during weak grid operating conditions. Recently, National High Power Testing Laboratory is established for testing of power transformer upto of 630 MVA. This is a unique online transformer test facility for testing of 765/400/220/132 kV class power transformers. An offline simulation has been carried out in this article, to assess the impact of online type testing on the Indian National grid. In this article, an online testing scheme has been presented which enables the national grid operator to analysis the prevailing grid condition & subsequently to decide the safe rating of the power transformer for online testing. The simulated results are cross checked with field results and it is found that simulated results are close to actual field results. The concurrence of simulated and field results helped in successfully commissioning of the testing laboratory.

High-voltage electrical equipment in electrical power systems: diagnostics, defects, damage, monitoring

2019 ◽  
Author(s):  
Александр Хренников ◽  
Alexander Khrennikov
Keyword(s):  
Power Systems ◽  
Short Circuit ◽  
Electrical Power ◽  
Electrical Equipment ◽  
Diagnostic Methods ◽  
Power Transformers ◽  
Electrical Power Systems ◽  
The Impact ◽  
Short Circuit Currents ◽  
Detection Of Defects

The analysis of the main methods of diagnostics of electrical equipment for detection of defects and damages in the course of operation is presented. Analysis of the effectiveness of the main diagnostic methods is accompanied by examples of detection of defects and damage to specific equipment: power transformers, reactors, current and voltage transformers, disconnectors, turbogenerators, OPN, etc. Examples of damage and investigation of technological violations of oil-filled transformer-reactor equipment during operation, associated with the loss of electrodynamic resistance of the windings during the flow of through short-circuit currents (short-circuit). The analysis of efficiency of application of methods of diagnostics at detection of defects and damages of power transformers because of the impact of fault current. The questions of electrodynamic tests of power transformers (reactors) for resistance to short-circuit currents, which serve as a tool to improve the reliability of their design, are considered.

scholarly journals An Efficient Procedure for Temperature Calculation of High Current Leads in Large Power Transformers

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 222371-222376
Author(s):  
Wilerson V. Calil ◽  
Pablo D. Paz Salazar ◽  
Andre Souza De Melo ◽  
Eduardo Coelho Marques Costa
Keyword(s):  
Power Transformers ◽  
High Current ◽  
Large Power ◽  
Efficient Procedure ◽  
Temperature Calculation ◽  
Current Leads

scholarly journals The investigation of frequency response analysis for power transformers winding condition

2019 ◽  
Vol 139 ◽  
pp. 01023
Author(s):  
Artyom Nazarov ◽  
Vitaliy Savelev ◽  
Dennis Frogh
Keyword(s):  
Frequency Response ◽  
Distribution Systems ◽  
Short Circuit ◽  
Mechanical Deformation ◽  
Power Transformers ◽  
Diagnostic Tools ◽  
Response Analysis ◽  
Frequency Response Analysis ◽  
Electrical Transmission ◽  
The Impact

In modern electrical transmission and distribution systems, power transformers are critical components within the network. In the event that a failure occurs in service, the impact can be far reaching. The majority of mechanical deformation within power transformers is due to short circuit faults. The ageing transformer population increases the likelihood of failure so a reliable diagnostic tools required to determine the remaining life of these assets. Although, frequency response analysis (FRA) has been recently recognized as the most reliable detection tool for mechanical deformation in transformers, in the event of minor fault, the current FRA interpretation approach may not able to detect any variations between healthy and faulty FRA signatures. This paper focuses on FRA tests for power transformer and interpretation of obtained FRA signatures.

scholarly journals The Impact of the Lack of Marine and Rail Standards on the Transportation of Large Power Transformers

2016 ◽  
Vol 33 (2) ◽  
Author(s):  
David Gillingham
Keyword(s):  
Best Practices ◽  
Power Transformers ◽  
Large Power ◽  
Premature Failure ◽  
Impact Forces ◽  
The Impact

Power transformers (>10MVA) are typically shipped from the factory by rail or marine cargo ship. In these harsh shipping environments, transformers are subjected to a variety of vibrational and impact forces. If these forces are too great, the transformers could be damaged, resulting in premature failure. There are few guidelines that describe best practices for monitoring, and, more importantly, mitigating such stresses when shipping transformers. Furthermore, manufacturers, railways, and marine shipping companies do not always have thisinformation available, particularly for refurbished units. This paper discusses the impact this documentation drought may have for the affected parties.

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