Improvements in transformer protection and control

Guzmán, Armando; Fischer, Normann; Labuschagne, Casper

doi:10.1109/cpre.2009.4982542

Cited by 48 publications

(21 citation statements)

References 7 publications

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“…Fig. 4 shows a typical implementation used in line current differential, transformer differential, and bus differential elements [3] [6] [9]. The EFD operating principle takes advantage of the fact that CTs do not saturate instantaneously.…”

Section: Q Security Under Ct Saturationmentioning

confidence: 99%

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Negative-sequence differential protection - principles, sensitivity, and security

Kasztenny¹,

Fischer²,

Altuve³

2015

2015 68th Annual Conference for Protective Relay Engineers

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This paper explains the principles of negativesequence differential (87Q) protection, its basis for excellent sensitivity and speed, and the need for securing it with external fault detectors to deal with the saturation of current transformers. The paper reviews applications of 87Q elements to lines and transformers. It explains why 87Q elements cannot be used for turn-to-turn fault protection in shunt reactors and stators of generators and motors. The paper presents applications of negative-sequence directional elements for turnto-turn fault protection in reactors and stators. Finally, it derives two new protection principles based on negative sequence for generator turn-to-turn fault protection. 978-1-4799-8722-1/15/$31.00

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Section: Q Security Under Ct Saturationmentioning

confidence: 99%

“…87Q elements are sometimes blocked upon EFD assertion [3]. More typically, their security is increased-at the expense of some loss of sensitivity-in anticipation of possible CT saturation.…”

Section: Q Security Under Ct Saturationmentioning

confidence: 99%

Negative-sequence differential protection - principles, sensitivity, and security

Kasztenny¹,

Fischer²,

Altuve³

2015

2015 68th Annual Conference for Protective Relay Engineers

Self Cite

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“…The transformer reliability is dependent on effective relay protection operation. Main problems in relay protection are failures in case of turn-to-turn fault in the transformer and in unjustified tripping in case of transients in energy system outside the protected zone [1], [2].…”

Section: Introductionmentioning

confidence: 99%

Identification of interturn faults in power transformers by means of generalized symmetrical components analysis

Ivanchenko

Смирнов

2019

E3S Web Conf.

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The paper deals with experimental identification of transformer internal faults, an important factor in reliability and sustainability of power supply systems. Task of identification of transformer internal faults requires increasing sensitivity of relay protection by calculation of components most sensitive to interwire faults from transformer current. In order to study internal faults in transformer, the model in Simulink MATLAB was developed on the basis of transformer constitutive equations. Transformer with short circuited wires was simulated as a multiwinding transformer. We provide the calculation of transformer parameters. Model was applied for analysis of transients in power transformers, such as interwire fault, transformer inrush, and fault in transformer connections. Analysis of power transformer internal faults by means of time-dependent symmetrical components of currents is provided. These symmetrical components were calculated for the first harmonic of current by means of discrimination of firs harmonic by low-pass filter and compensating elements implementing phase shift. Described method allows calculation of symmetrical components during transient and under non-sinusoidal conditions. Simulation results showed the advantage of instantaneous symmetrical components of other direct values. Those components were implemented in relay protection algorithms for identification of internal faults in transformers.

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“…As the digital technology advances, the digital hardware becomes low cost, reliable Operation and simple in construction. Hence, in electric power system the transformer can be protected with the use of digital relays [3] [6].…”

Section: Introductionmentioning

confidence: 99%

Transformer Optimal Protection using Internet of Things

Arabelli¹,

Rajababu²

2019

IJITEE

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In power system transmission and distribution transformers plays crucial role. As per the consumer requirement the transformers either step up or step down voltages and deliver the power. Sometimes they are operating under overload conditions. In this paper, Microcontroller and different types of sensors can be used to protect the transformer against over load and various internal faults. Real time monitoring of the transformer is also an important part in the transformers protection. A prototype hardware module has designed to sense the temperature raise and pressure in the transformer tank using micro controller based sensors. The monitoring and protection can avoid various faults in the transformer and it can give better performance.

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Improvements in transformer protection and control

Cited by 48 publications

References 7 publications

Negative-sequence differential protection - principles, sensitivity, and security

Negative-sequence differential protection - principles, sensitivity, and security

Identification of interturn faults in power transformers by means of generalized symmetrical components analysis

Transformer Optimal Protection using Internet of Things

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