Current state of transformer FRA interpretation

Picher, P.; Tenbohlen, Stefan; Lachman, M.F.; Scardazzi, Alaor; Patel, Poorvi

doi:10.1016/j.proeng.2017.09.689

Cited by 26 publications

(11 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…De 20 kHz a 1MHz, a maior contribuição para a resposta em frequência tem origem na estrutura própria do enrolamento. Acima de 1 MHz, os efeitos dos cabos de conexão do sistema de medição são os responsáveis pelos picos de ressonâncias da resposta em frequência e os resultados obtidos devem ser interpretados com cuidado, sobretudo no que diz respeito aos enrolamentos de alta tensão (AT) conectadosà buchas muito longas Picher et al (2017 2017do sistema elétrico para sua instalação, sendo contudo, mais simples e de menor complexidade a instalação do modelo isolado "Split Core". O princípio de operação do acoplador indutivo do tipo "Split Core"equivale ao de um transformador de corrente com relação de espiras de 1/N, onde "N"representa o número de espiras que compõe a bobina do acoplador.…”

Section: Plc Na Média Tensãounclassified

Estratégias de Acoplamento de Sinais Power Line Communication em Circuitos de Média Tensão

Sauthier

Oliveira

Campos

et al. 2020

Anais Do Congresso Brasileiro De Automática 2020

View full text Add to dashboard Cite

A tecnologia Power Line Communication (PLC) já está consolidada em vários países europeus, além de países como os EUA e Canadá. No entanto, o seu uso no Brasil ainda é bastante restrito especialmente pelas particularidades das redes elétricas brasileiras. Nesse sentido atualmente estudos dedicados e propositivos de técnicas/metodologias de adaptação desta tecnologia para as características das redes brasileiras ainda são raros. O principal objetivo deste trabalho é analisar estratégias de acoplamento de sinais PLC em circuitos de média tensão, em sistemas de distribuição de energia elétrica, através de Acopladores Indutivos e Transformadores de Potência já presentes nos sistemas de distribuição. Todos os ensaios avaliativos são realizados a partir de um conjunto de dados obtidos de uma concessionária de energia do sul do Brasil objetivando analisar o real comportamento da tecnologia PLC em uma típica rede brasileira.

show abstract

Section: Plc Na Média Tensãounclassified

Estratégias de Acoplamento de Sinais Power Line Communication em Circuitos de Média Tensão

Sauthier

Oliveira

Campos

et al. 2020

Anais Do Congresso Brasileiro De Automática 2020

View full text Add to dashboard Cite

show abstract

“…Sd^= q (8) In this contribution, a turn-based 3D high-frequency model of a three-limb, three-phase, core type, three MVA transformer is simulated. This model consists of high-voltage (HV) and lowvoltage (LV) windings, the insulation paper, core and surrounding tank.…”

Section: Fra Test Configurationsmentioning

confidence: 99%

“…However, the interpretation of FRA results is still far from reaching an accepted and definitive methodology and is limited to the analysis of the experts in the field. Currently, there is a CIGRE working group A2.53 aiming to produce a technical brochure containing guidelines for interpretation of FRA results [8]. Despite many research efforts in developing a systematic interpretation methodology, there is still no universally accepted definitive algorithm and objective criterion for detecting winding abnormalities, which is a big challenge towards the practical application of FRA.…”

Section: Introductionmentioning

confidence: 99%

FRA lookup charts for the quantitative determination of winding axial displacement fault in power transformers

Tahir

Tenbohlen

2020

IET Electric Power Applications

Self Cite

View full text Add to dashboard Cite

Frequency response analysis (FRA) has gained attention as a reliable diagnostic tool, to assess the mechanical integrity of power transformers, due to standardised FRA measurement methods. However, the assessment of FRA results is still a challenge as it demands skilful personnel for diagnosis. Since there is no definitive and reliable code available for FRA interpretation. In this study, the three‐dimensional (3D) finite integration technique is used to simulate the physical geometrical dimensions of a three‐phase transformer which emulate the behaviour of real transformer and frequency response measurements. This novel method eliminates the need for lumped parameter circuit models, as it provides the ability to extract the FRA signatures directly from the 3D winding model. Axial displacement of different levels is simulated in several connection schemes. It was found that variation of the inter‐winding capacitance due to the axial displacement possesses a linear relationship with the degree of axial displacement fault. This provides the possibility for the quantitative determination of winding axial displacement fault using FRA. A simple mathematical relation is derived for calculating the variation of inter‐winding capacitance and a geometrical factor is introduced to generalise the method. Finally, lookup charts are introduced to diagnose axial displacement fault in different transformers.

show abstract

“…Hence, a systematic approach for the interpretation of FRA results is of essential need. Currently, there is a CIGRE working group A2.53, aiming to produce a technical brochure containing guidelines for interpretation of FRA [10].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, various numerical indices are proposed in the literature as a quantitative method for fault detection by comparing two FRA traces [10,14]. At present, these numerical indices are applied in fixed frequency sub-bands.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Analysis of Windings Electrical and Mechanical Faults Using a High-Frequency Model

Tahir

Tenbohlen

2019

Energies

Self Cite

View full text Add to dashboard Cite

The measurement procedures for frequency response analysis (FRA) of power transformers are well documented in IEC and IEEE standards. However, the interpretation of FRA results is still far from reaching an accepted methodology and is limited to the analysis of the experts. The dilemma is that there are limited case studies available to understand the effect of different faults. Additionally, due to the destructive nature, it is not possible to apply the real mechanical deformations in the transformer windings to obtain the data. To solve these issues, in this contribution, the physical geometry of a three-phase transformer is simulated using 3D finite integration analysis to emulate the real transformer operation. The novelty of this model is that FRA traces are directly obtained from the 3D model of windings without estimating and solving lumped parameter circuit models. At first, the method is validated with a simple experimental setup. Afterwards, different mechanical and electrical faults are simulated, and their effects on FRA are discussed objectively. A key contribution of this paper is the winding assessment factor it introduces based on the standard deviation of difference (SDD) to detect and classify different electrical and mechanical faults. The results reveal that the proposed model provides the ability of precise and accurate fault simulation. By using SDD, different deviation patterns can be characterized for different faults, which makes fault classification possible. Thus, it provides a way forward towards the establishment of the standard algorithm for a reliable and automatic assessment of transformer FRA results.

show abstract

Current state of transformer FRA interpretation

Cited by 26 publications

References 18 publications

Estratégias de Acoplamento de Sinais Power Line Communication em Circuitos de Média Tensão

Estratégias de Acoplamento de Sinais Power Line Communication em Circuitos de Média Tensão

FRA lookup charts for the quantitative determination of winding axial displacement fault in power transformers

A Comprehensive Analysis of Windings Electrical and Mechanical Faults Using a High-Frequency Model

Contact Info

Product

Resources

About