• Vol 11, No 2 (2020)
  • Industrial Engineering

Data-driven Fault Diagnosis of Power Transformers using Dissolved Gas Analysis (DGA)

Arian Dhini, Akhmad Faqih, Benyamin Kusumoputro, Isti Surjandari, Andrew Kusiak

Corresponding email: arian@ie.ui.ac.id


Cite this article as:

Dhini, A., Faqih, A., Kusumoputro, B., Surjandari, I., Kusiak, A., 2020. Data-driven Fault Diagnosis of Power Transformers using Dissolved Gas Analysis (DGA). International Journal of Technology. Volume 11(2), pp. 388399



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Arian Dhini Laboratory Industrial Engineering Department, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
Akhmad Faqih Department of Electrical Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
Benyamin Kusumoputro Department of Electrical Engineering, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
Isti Surjandari Laboratory Industrial Engineering Department, Faculty of Engineering, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia
Andrew Kusiak Department of Industrial and Systems Engineering, College of Engineering, University of Iowa, 4627 Seamans Center for the Engineering Arts and Sciences, Iowa City -Iowa, 52242, USA
Email to Corresponding Author

Abstract
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A power transformer is a critical piece of equipment in a power plant for distributing electricity, and it experiences thermal and electrical stresses during operation. Dissolved gas analysis (DGA) remains one of the most effective techniques to monitor the health of oil-filled transformers. Some traditional approaches for interpreting DGAs have been introduced. Occasionally, such approaches leave the state of the transformer uncategorized. This study proposed data-driven approaches for a fault diagnosis system based on DGA data using support vector machine (SVM). SVM is known for its robustness, good generalization capability, and unique global optimum solutions, particularly when data is limited. Backpropagation neural networks (BPNN) and extreme learning machine-radial basis function (ELM-RBF), a recent Neural Networks (NN)-based method with extremely fast computation time, were compared to SVM. An advanced technique to overcome the imbalanced data and synthetic minority oversampling technique (SMOTE) was proposed to investigate the effect on classifier performance. The model was trained and tested using IEC TC 10 databases and transformer DGA monitoring data of a thermal power plant in Jakarta. The results indicated that SVM displayed the best performance compared to ELM-RBF and BPNN. It demonstrated extremely high accuracy, while still maintaining fast computation time for all stages in the proposed multistage fault diagnosis system.

Condition monitoring; Dissolved gas analysis; Fault diagnosis; Support vector machine; Transformer

Introduction

Thermal power plants remain main electricity providers; however, most of them are highly aged. According to Ulum et al. (2017), plant equipment, which degrades over time, leads to electricity production loss. Therefore, the industrial process measurements are imperative to monitor and assure the quality and safety in operations (Kusiak and Song, 2009). Those measurements are the bases to determine the maintenance activities. Such maintenance will raise the reliability and availability of equipment (Pariaman et al., 2017), including the reliability and availability of power transformers, one of the key pieces of equipment  in a  power distributing system.   Despite  the fact  that  faults  in a transformer occur infrequently, once they do occur, their impact is significant in terms of safety, downtime, and equipment loss (Hernandez and Labib, 2017). DGA has been known to be a popular, sensitive, and reliable technique to monitor the insulation condition of transformers (Saha, 2003; Chakravorti et al., 2013). However, conventional DGA interpretation methods include certain drawbacks in terms of accuracy and uncertainty (Shintemirov et al., 2009; Ghoneim and Taha, 2016). These approaches require the manual interpretation of experts, and some measurements may be unidentifiable when using any interpretation method (Lin et al., 1993; Yang et al., 2009; Abu-Siada and Islam, 2012).

Faults should be diagnosed accurately and in a timely manner, since ignoring them degrades the safety and security of the process, and it could lead to catastrophic failures and loss of material and even life (Gao et al., 2015). Therefore, machine learning methods have been recently applied in studies for transformer fault detection and diagnosis (FDD) using DGA data. Support vector machine (SVM) has become an increasingly popular technique in machine learning. SVM is known for its robustness, good generalization capability, and unique global optimum solution. Shin and Cho (2006) explained that its good generalization capability was due to structural risk minimization, which is employed by SVM, rather than empirical risk minimization, as in NN. SVM also performs well with small samples and high dimension data, while still maintaining short computational times (Lv et al., 2005; Bacha et al., 2012; Sahri and Yusof, 2015; Souza and Ramachandran, 2016). Some studies have compared SVM with other methods, such as kNN, ANN (Shintemirov et al., 2009), the expert system (Lv et al., 2005), fuzzy logic, multilayer perceptron (MLP), and radial basis function neural networks (RBFNN) (Fei et al., 2009; Bacha et al. 2012). These studies found that SVM performed better. Ghoneim and Taha (2016) conducted a fault diagnosis study in the same area, but they only applied limit rules to categorize faults.

In reality, the availability of fault data is usually significantly lower than the normal operating condition (NOC). This situation may lead to a decrease in classifier performance. Fault diagnosis focuses on how to detect a fault, the minority class. Sahri and Yusof (2015) tested some scenarios of input features without considering how to handle imbalanced data. Only a few studies have considered this imbalanced data in FDD. Chawla et al. (2002) proposed the use of the synthetic minority oversampling technique (SMOTE) to overcome the imbalanced data problem by creating new data through an interpolation process. No previous studies have applied SMOTE in the case of transformers for fault diagnosis.

This study aims to develop an accurate and fast transformer fault diagnosis system from DGA data using SVM and SMOTE for data balancing. Other recent classifier methods, extreme learning machine-radial basis function (ELM-RBF), which is known for its extremely fast computation time, is applied. The high computation of ELM-RBF, while still maintains good accuracy, will result in a number advantages, such as fast fault diagnosis and lower hardware investment costs.  In addition, the classical approach of the NN-based technique, backpropagation neural networks (BPNN), was also tested. He and Kusiak (2017) employed SVM, Multi-layer perceptron (MLP) and ELM based methods, which performed satisfactorily, to predict wind power. This study contributes to the possibility of lengthening transformer life by proposing fault diagnosis systems using aforementioned data-driven approaches. The proposed models were trained and tested using the fault and NOC DGA data from IEC TC 10 and NOC DGA data from a thermal power plant in Jakarta. Ghoneim and Taha (2016) and Sahri and Yusof (2015) used IEC TC 10 as a data source as well. Only Ghoneim and Taha (2016) and Sahri and Yusof (2015) used real data, whereas Bacha et al. (2012) used simulated data from the Tunisian company of Electricity and Gas.  

The remainder of this article is organized as follows. Section 2 describes the study methods used in this research, from the proposed research framework to the methods applied. The following section, Section 3, elaborates the results and discusses the fault diagnosis based on certain performance measures. Some concluding remarks and areas of future research are provided in Section 4.


Conclusion

Based on the two performance measures of accuracy and computation time, it can be concluded that the SVM outperforms other NN-based methods, ELM-RBF and BPNN, for the proposed multistage fault diagnosis of power transformers using DGA data. SVM performs satisfactorily with high accuracy and fast computation time. It has proven to be an effective method in terms of classification with a better generalization. Despite its poorer results compared to SVM, ELM-RBF also performed the best in terms of computation time. In terms of accuracy, BPNN exhibited the best accuracy. In the future, research to improve accuracy, data quantity, and data quality should be enhanced by adding more training data, selecting optimum features, and combining other types of input data, such as gas ratio. More comparisons with other data-driven methods, such as decision trees, kNN, or even deep learning, and applying optimization in parameter selections, represent additional options.

Supplementary Material
FilenameDescription
R1-IE-3625-20200207193846.jpg Figure 1
R1-IE-3625-20200207193907.jpg Figure 2
R1-IE-3625-20200207193931.jpg Figure 3 (revised)
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