A Systematical Method for Suppressing Ferroresonance at Neutral-Grounded Substations

Li, Y.; Qin, Rui; Yang, J.; Shi, Wei

doi:10.1109/mper.2002.4311933

Cited by 15 publications

(4 citation statements)

References 8 publications

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“…Considering the open circuit breaker capacitive model, a series resonance [41] may occur. However, by increasing the transformer current, the core will reach the saturation region, and the ferroresonance may happen [42].…”

Section: Transformer Resonance Occurred Due To the Open Breaker Effectsmentioning

confidence: 99%

Transformer Resonance: Reasons, Modeling Approaches, Solutions

et al. 2023

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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.

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Section: Transformer Resonance Occurred Due To the Open Breaker Effectsmentioning

confidence: 99%

Transformer Resonance: Reasons, Modeling Approaches, Solutions

et al. 2023

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“…In the past, it was believed that ferromagnetic resonance was the main cause of the blowing of the fuse of the voltage transformer, while it was not considered so after more research. Reasons fora fuse failing to blow are mainly related to the following points: (1) A saturation current is induced bya ferromagnetic resonance [3][4][5][6][7][8][9][10][11][12]. The long term VT current may cause the VT fuse to overheat and blow out to protect the distribution network system if the ferromagnetic resonance is not suppressed.…”

Section: Introductionmentioning

confidence: 99%

Impact Transient Characteristics and Selection Method of Voltage Transformer Fuse

Wang¹,

Liu²,

Yang

et al. 2019

Energies

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In a neutral ungrounded system, the high voltage fuses used to protect voltage transformers (VTs) often abnormally blow out, causing unbalanced VT operation. Fuses also fail to blow out in time, resulting in further damage to the VT. This paper reported the results of steady-state current testing, breaking characteristics, X-ray measurements, fuse corona testing, and electromagnetic transient impact testing for VT fuses. This paper comprehensively examines and analyzes the quality and electrical performance of VT fuses and provides new guidance for the use of high voltage fuses in voltage transformers. This paper recommends that 35 and 10 kV systems use fuses rated for a current of 1 A based on a single fuse, which is not easily oxidized and has a wound skeleton composed of an Ag or Ni melt.

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“…The resistance of a primary harmonic elimination device of 10 kV and below is above 60 kΩ, and the resistance value of 35 kV primary harmonic elimination device is above 150 kΩ. At present, many suppression measures [5][6][7][8][9][10][11][12] have been proposed based on the mechanism of ferromagnetic resonance [13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

On-Line Detection of Voltage Transformer Insulation Defects Using the Low-Frequency Oscillation Amplitude and Duration of a Zero Sequence Voltage

Liu¹,

Wang²,

Yang

et al. 2019

Energies

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The insulation degradation of a voltage transformer winding is not easy to find, but it may ultimately cause the transformer to explode, leading to accidents such as phase-to-phase short circuits. At present, power transformers, lightning arresters, and other equipment have on-line methods to detect the insulation state. However, there is no mature method for the on-line monitoring of voltage transformer winding insulation. In this study, a small current disturbance method based on a zero-sequence loop is proposed. The characteristic parameters of the low-frequency oscillation of zero-sequence voltage after a disturbance are used to evaluate the insulation state of the winding and detect faults. Theoretical modeling, simulation tests, and field tests show that when the insulation resistance of the voltage transformer winding is in the range 0–40 kΩ, a low frequency oscillation of about 10 Hz can be detected on the zero-sequence voltage, and its amplitude and duration are proportional to the degree of damage to the insulation. This can hence be used as a criterion for the on-line detection of voltage transformer winding insulation defects.

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A Systematical Method for Suppressing Ferroresonance at Neutral-Grounded Substations

Cited by 15 publications

References 8 publications

Transformer Resonance: Reasons, Modeling Approaches, Solutions

Transformer Resonance: Reasons, Modeling Approaches, Solutions

Impact Transient Characteristics and Selection Method of Voltage Transformer Fuse

On-Line Detection of Voltage Transformer Insulation Defects Using the Low-Frequency Oscillation Amplitude and Duration of a Zero Sequence Voltage

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