Fuzzy logic-based relaying for large power transformer protection

Shin, Min Jae; Park, Chul‐Won; Kim, Jong-Hyung

doi:10.1109/tpwrd.2003.813598

Cited by 109 publications

(8 citation statements)

References 11 publications

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“…There is no data loss during the process because of this property. The fault detection generates more precise results than conventional relaying techniques [18]. The fuzzy inference collects and processes data, mapping from a given input to an output, using fuzzy logic.…”

Section: Fuzzy Epvamentioning

confidence: 99%

“…Using fuzzy logic overcomes the traditional PT differential scheme's limitations by detecting a low-level TTF. The fuzzy-based technique is simple, robust, and able to detect incipient faults at an early stage [4], and shows a fast and accurate trip operation [18]. The fuzzy algorithm also improves the accuracy of the diagnosis and the efficiency of transformer maintenance [19].…”

Section: Introductionmentioning

confidence: 99%

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Turn-to-Turn Fault Diagnosis on Three-Phase Power Transformer Using Hybrid Detection Algorithm

2021

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A power transformer (PT) in power generation or transmission is critical to maintaining electrical continuity. Fault detection on a PT is needed, especially of incipient faults, which are often caused by a turn-to-turn fault (TTF) before it develops into a more severe fault. We use a hybrid algorithm between conventional and modern techniques to detect a developing fault in a PT. The current response signals from a negative sequence current directional algorithm, extended park vector algorithm (EPVA), differential negative sequence current, and EPVA-fuzzy system are combined to distinguish the possibility of a TTF. The subalgorithms are combined using a hybrid detection algorithm to distinguish the faults. The model is a 10 MVA, three-phase PT with Δ-Y configuration 150/300 kV, simulated using MATLAB Simulink software. The results show that by combining the subalgorithms, several limitations are distinguished within the TTF with a slight increase in accuracy.

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Section: Fuzzy Epvamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Turn-to-Turn Fault Diagnosis on Three-Phase Power Transformer Using Hybrid Detection Algorithm

2021

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“…The second harmonic restraint method in the neutral current should ensure that the relay does not react unnecessarily during transformer switching on. However, with internal transformer faults the level of the second harmonic can be high [8,10,16,33]; thus in these situations the relay would have been unnecessarily blocked. It was noted that in the magnetizing inrush currents of the new generation transformers having cores made of low-loss amorphous materials, the contents of the second harmonic were considerably lower, whereas the current amplitudes could be quite high [8].…”

Section: Concept Of Ref Protectionmentioning

confidence: 99%

“…Since applications of numerical differential protection began [6] up to the present date, different methods of protection improvement have been developed whereby the unfavorable influence of a magnetizing inrush current can be overcome. Some of them are wavelet transform [7][8][9], artificial neural network [10][11][12][13][14], fuzzy logic [15,16], S-transform [17,18], waveform analysis [6,19], and harmonic restraint and blocking [20,21]. Waveform analysis and harmonic restraint and blocking [2] are the most often applied.…”

Section: Introductionmentioning

confidence: 99%

A new algorithm for avoiding maloperation of transformer restricted earth fault protection caused by the transformer magnetizing inrush current and current transformer saturation

Krstivojevic¹,

Djurić²

2016

Turk J Elec Eng & Comp Sci

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Owing to current transformer (CT) saturation caused by a decaying direct current component in the magnetizing inrush current, the restricted earth fault (REF) protection of a power transformer could maloperate during magnetizing inrush. This paper presents a new transformer restricted earth fault relay algorithm that can prevent false relay tripping and provide proper action during the energization of a faulty transformer. The integral of the product of the signals that are compared is calculated over 1 half-period of the signals. The performance of the proposed algorithm is tested and verified using a large number of transformer energization trials and fault cases. The signals required for testing of the algorithm were obtained by laboratory measurements, and then the algorithm was tested off-line. The influence of different levels of CT saturation due to different remanent fluxes in CT cores during power transformer energization was investigated. By applying computer simulations, the signals required for algorithm testing were generated. The investigation results presented in this paper show that the new algorithm provided sensitive protection for the power transformer for phase to ground faults and high security and stability during magnetizing inrush conditions in conjunction with CT saturation.

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“…As an important part of power system, voltage measurement plays a decisive role in energy measurement [1][2][3], relay protection [4][5][6], overvoltage online monitoring [7,8], and automatic equipment control [9,10]. Its accuracy, real-time performance, and reliability are the basis for ensuring the safe operation of the power system.…”

Section: Introductionmentioning

confidence: 99%

Design and Experiments of Voltage Sensor Based on Electric Field Coupling Principle and Differential Input Structure

Zhou¹,

Zhuang²,

Zhou³

et al. 2020

Preprint

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Traditional potential transformers have problems of large volume, difficulty in insulation, iron core saturation, ferroresonance overvoltage and poor transient response characteristics. The voltage sensor based on the principle of electric field coupling and differential input structure does not need to contact the measured object or ground, and can avoid the above problems. However, it requires a sufficiently high capacitance between the differential electrodes to obtain sufficient accuracy and a high voltage division ratio. The existing method of using mutual capacitance between the differential electrodes will cause many problems and fail to meet the practical needs. To solve the above problems, this paper innovatively uses multi-layer ceramic capacitor to replace the mutual capacitance and designs a new type of voltage sensor. In addition, by using single bypass small resistance grounding method to increase the input impedance of the differential signal processing circuit, error of the sensor is further reduced. The experimental results show that the sensor has excellent accuracy and great transient response characteristics. The ratio error under power frequency is within ±0.5% and the phase error is within 1. The ratio error in the range of 500 Hz&sim;30 kHz is within ±5% and the phase error is within 5. Moreover, it has the advantages of low cost, miniaturization, flexible shape and easy to adjust the voltage division ratio. These characteristics indicate that the sensor has good voltage measurement and sensor network potential.

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Fuzzy logic-based relaying for large power transformer protection

Cited by 109 publications

References 11 publications

Turn-to-Turn Fault Diagnosis on Three-Phase Power Transformer Using Hybrid Detection Algorithm

Turn-to-Turn Fault Diagnosis on Three-Phase Power Transformer Using Hybrid Detection Algorithm

A new algorithm for avoiding maloperation of transformer restricted earth fault protection caused by the transformer magnetizing inrush current and current transformer saturation

Design and Experiments of Voltage Sensor Based on Electric Field Coupling Principle and Differential Input Structure

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