Suppression of Incoming High-Frequency Overvoltage in Transformer Coils

Korobeynikov, S. M.; Krivosheev, S. I.; Magazinov, Sergey G.; Loman, Valentin A.; Ya, Nikolay

doi:10.1109/tpwrd.2020.3031592

Cited by 6 publications

(4 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Figure 3, L is the inductance of the reactor, R L is the equivalent parallel resistance representing the loss of the reactor, C Z is the equivalent capacitance of the interturn capacitance network, and C g1 and C g2 are the values of the stray capacitance of the reactor to the ground equivalent to the first and last ends, respectively [12,13].…”

Section: Simulation Of Startingmentioning

confidence: 99%

Life Prediction of Dry Reactor Sensor Based on Deep Neural Network

et al. 2022

View full text Add to dashboard Cite

In order to solve the problem of increasing the number and service life of a dry-type air core reactor and frequent interturn insulation faults, this paper proposes a life prediction method of a dry-type reactor sensor based on the deep neural network. On the basis of summarizing the research status of turn-to-turn insulation-related problems, this method studies the switching overvoltage generated in the process of breaking the dry-type air core reactor, the deterioration law of turn-to-turn insulation under the cumulative action of switching overvoltage, the influence of thermal aging on the Switching Overvoltage Withstand characteristics of turn-to-turn insulation, and the electrical aging life of turn-to-turn insulation under the power frequency overvoltage. Based on the deep neural network, the electrical aging life model of turn-to-turn insulation of the dry-type air core reactor under power frequency overvoltage is obtained. The results are as follows: with the increase of the applied voltage amplitude, the deterioration speed of the turn-to-turn insulation of the model sample accelerates. When the applied voltage amplitude reaches a certain value, the maximum discharge amount and pulse discharge power of the partial discharge pulse increase rapidly, and the image coincidence degree reaches 85%. The electric aging life curve of the modified interturn insulation model sample of the dry-type air core reactor has a high correlation with the measured aging life data, and the performance is more than 95%. The research results of this paper lay a practical foundation for further research on the deterioration mechanism of interturn insulation under the combined action of multiple factors and provide theoretical support for the risk and life assessment of the dry-type air core reactor.

show abstract

Section: Simulation Of Startingmentioning

confidence: 99%

Life Prediction of Dry Reactor Sensor Based on Deep Neural Network

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The FDD and the choke [99], [102] are the two main methods for protecting the transformer from resonance overvoltage. The design relies on the ferromagnetic power conductor.…”

Section: ) Series Inductive Protection Methods Evaluationmentioning

confidence: 99%

“…This device comprises a multilayer wire using both aluminum and ferromagnetic material, which are wounded as a reactor and connected to input cables of a power substation. FDD provides meager resistance for grid frequency (50 or 60 Hz) and imposes high resistance of nearly 200 for frequencies around 200 kHz [99]. In [99], it is obtained that FDD protects well from short pulses and has little effect on long pulses.…”

Section: ) Frequency-dependent Protection Devicementioning

confidence: 98%

“…FDD provides meager resistance for grid frequency (50 or 60 Hz) and imposes high resistance of nearly 200 for frequencies around 200 kHz [99]. In [99], it is obtained that FDD protects well from short pulses and has little effect on long pulses. The designed device parameters must be developed or integrated with devices like the arrester to protect the transformer properly.…”

Section: ) Frequency-dependent Protection Devicementioning

confidence: 98%

See 1 more Smart Citation

Transformer Resonance: Reasons, Modeling Approaches, Solutions

et al. 2023

View full text Add to dashboard Cite

Due to the extension of the power grid with many complex and compact pieces of power equipment, transformers will be more exposed to fast transient, resulting from various resonance conditions. Transformer resonance can result in severe overvoltage on internal parts of the winding, leading to insulation failure and, consequently, transformer outage. The main reasons for resonance occurrence, the practical method to measure the resonance of transformers, and the solution for preventing transformer resonances have been discussed in the scientific reports over the past few decades; however, a comprehensive review of these studies is not present in the literature. Hence this paper aims to provide a comprehensive review to categorize the main reasons for transformer resonance, modeling methods, and appropriate solutions to suppress this phenomenon and suggest some prospective protection for future works.

show abstract