New algorithms for power transformer inter-turn fault protection

Wiszniewski, Andrzej; Rebizant, W.; Schiel, L.

doi:10.1016/j.epsr.2009.04.021

Cited by 30 publications

(20 citation statements)

References 2 publications

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“…Online method using ZS current/voltage is introduced in previous studies . Figure shows the Yd transformer connection wherein an internal fault has occurred in its star side.…”

Section: Current/voltage‐based Methodsmentioning

confidence: 99%

Turn-to-turn fault monitoring methods in electrical power transformers-State of the art

Mostafaei

Faiz

Venikar

et al. 2018

Int Trans Electr Energ Syst

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Summary Power transformer is a vital component in the power system, and it must be protected against various core and winding faults. Turn‐to‐turn fault (TTF) is one of the most common faults in transformer that causes catastrophic events such as transformer explosion, winding, or core deformation. Conventional differential relay is a common device for protection of transformer protection, and it can diagnose the severe TTF; however, it fails to detect the TTF at incipient stage. Recently, several methods and techniques have been introduced to improve the differential relay performance against TTFs. These approaches use various quantities such as current/voltage, frequency, and magnetic flux to detect the TTF in transformer winding. This paper reviews and compares various online and offline TTF diagnosis methods. Moreover, the advantages and disadvantages of these methods are discussed in the paper to analyze their performance in different conditions.

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“…Online method using ZS current/voltage is introduced in previous studies . Figure shows the Yd transformer connection wherein an internal fault has occurred in its star side.…”

Section: Current/voltage‐based Methodsmentioning

confidence: 99%

Turn-to-turn fault monitoring methods in electrical power transformers-State of the art

Mostafaei

Faiz

Venikar

et al. 2018

Int Trans Electr Energ Syst

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“…Because the differential relay is highly sensitive to severe faults, the following analysis focuses on the less‐severe inter‐turn faults of the VRT. The percentage of short‐circuit turns and the operating tap position are 2 factors that affect the accuracy of the adaptive turns ratio . Two conditions during positive‐polarity regulation are simulated to evaluate the performance of VRT differential protection based on the proposed adaptive algorithm.…”

Section: Simulation and Validationmentioning

confidence: 99%

Adaptive algorithm for identifying OLTC position and its application on UHV voltage-regulating transformer differential protection

Zheng

Liu

et al. 2018

Int Trans Electr Energ Syst

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The voltage-regulating transformer (VRT) with on-load tap changer is specifically used to adjust the voltage on the medium-voltage side of the ultra-high voltage power transformer. In practice, during the process of on-load voltage regulation, it is difficult to acquire the tap changer's positon, which is necessary for the calculation of the VRT differential current. Therefore, a novel algorithm is proposed to identify the real-time turns ratio of the VRT, adaptively, according to the structure of the ultra-high voltage power transformer. On the basis of the real-time turns ratio, the adaptive differential current is calculated. Both theoretical analysis and simulation results indicate that the proposed algorithm can track and calculate the turns ratio accurately, thus preventing unbalanced currents during the tap-changing process. Moreover, the performance of the VRT differential protection is evaluated under inter-turn fault conditions. Simulation results verify that the proposed algorithm can overcome the disadvantages in the existing protection schemes.KEYWORDS differential protection, inter-turn fault, on-load tap changer (OLTC) position, ultra-high voltage (UHV), voltage-regulating transformer (VRT)

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“…Increased sensitivity can be further achieved by subtracting the no-load losses in (12) or even by taken into consideration the windings resistance variation with the windings temperature. These factors are not considered here.…”

Section: (B)] Is Consideredmentioning

confidence: 99%

“…Moreover, in the case of turn-to-turn insulation faults, even though the currents at the fault location may possibly be very high and dangerous, the differential currents are relatively small [12]. The traditional transformer differential protection is typically not sensitive enough to detect such winding defects before they have developed into more serious and costly to repair ground-faults [13].…”

Section: Introductionmentioning

confidence: 99%

“…Not surprisingly, a significant amount of research work has been devoted over the last decades to solve the inrush/fault discrimination dilemma of the transformer differential protection. Several solutions have been proposed in this context, including the refinement of the traditional harmonic restrain methods [14][15][16][17], the development and exploration of new trip and restrain signals [10,[12][13][18][19][20][21][22][23][24][25][26][27][28][29][30][31], the use of wave-shape recognition methods [32][33][34], and the application of advanced digital signal processing tools [11,[35][36][37], fuzzy logic and artificial intelligence techniques [31,[38][39][40]. These methods can provide an alternative or improvement to the existing protective relaying functions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Application of Park's power components to the differential protection of three-phase transformers

Oliveira

Cardoso

2012

Electric Power Systems Research

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New algorithms for power transformer inter-turn fault protection

Cited by 30 publications

References 2 publications

Turn-to-turn fault monitoring methods in electrical power transformers-State of the art

Turn-to-turn fault monitoring methods in electrical power transformers-State of the art

Adaptive algorithm for identifying OLTC position and its application on UHV voltage-regulating transformer differential protection

Application of Park's power components to the differential protection of three-phase transformers

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