Calculation of Hot Spot Temperature of Transformer Bushing Considering Current Fluctuation

Yang, Zhifei; Ruan, Jiangjun; Huang, Daochun; Zhang, Du; Tang, Liezheng; Zhou, Taotao

doi:10.1109/access.2019.2937510

Cited by 17 publications

(10 citation statements)

References 11 publications

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“…The energy consumed by a dielectric per unit time, that is, the energy generated by dielectric heating, is called dielectric loss. Under a constant electric field, there is no periodic polarization process in the dielectric, so the dielectric loss is only caused by conductivity [9][10]. Under AC voltage, in addition to the loss caused by conductivity, there is periodic relaxation polarization related to thermal motion, resulting in energy loss [11].…”

Section: Analysis Of Active Power Loss Of Bushingsmentioning

confidence: 99%

Evaluation Method of 500kV Transformer Bushing Insulation State Based on Active Power Loss

Gu¹,

Xu²,

Li³

et al. 2022

J. Phys.: Conf. Ser.

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The bushing is one of the most important components of power transformer, and it is very important to find the internal defects of bushings as soon as possible, effectively and accurately diagnose its insulation state information. In this paper, the active power loss of 500kV transformer bushings have been analyzed, and the insulation state evaluation method based on active power loss is proposed. To verify the feasibility of evaluation method, one abnormal 500kV transformer bushing was selected to analyze its insulation state. The result shows that this method can be used as a powerful complement to tarδ.

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Section: Analysis Of Active Power Loss Of Bushingsmentioning

confidence: 99%

Evaluation Method of 500kV Transformer Bushing Insulation State Based on Active Power Loss

Gu¹,

Xu²,

Li³

et al. 2022

J. Phys.: Conf. Ser.

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“…where β is the expansion coefficient; the value of the oil is 0.0008 [22]. V is the volume before oil expansion and T is the temperature.…”

Section: T (°C)mentioning

confidence: 99%

“…The top, condenser body and the flange are set to aluminum, and the upper and lower porcelain envelopes are set to ceramic. In addition, both gas and insulating oil are fluids, and the dynamic viscosity are set to 1.86 × 10 −5 m 2 /s and 10 Pa•s [22], respectively. More information is specified in Table 2.…”

Section: Criterion For Bushing Sealing Conditionmentioning

confidence: 99%

Oil Pressure Monitoring for Sealing Failure Detection and Diagnosis of Power Transformer Bushing

Chen

et al. 2021

Energies

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Power transformer bushings withstand great electrical and mechanical stress during high voltage and high current working conditions. Sealing failure poses a great threat to the long-term and reliable operation of the bushing and power transformer; however, the criterion to evaluate the sealing status of a bushing caused by mechanical problems is still lacking. In this paper, a transformer bushing model is established to gain theoretical insight into the relationship between temperature and pressure of a compact multilayer bushing. To evaluate the bushing mechanical status, different sealing conditions are tested based on the temperature and pressure monitoring within the physical 110 kV bushing. The results show that mechanical sealing failure can be diagnosed when the fluctuation of the oil pressure value exceeds the theoretical curve in steady state by 3 kPa. With different reliability coefficients, gas leakage and oil leakage are available to be further determined. The primary and auxiliary criteria based on oil pressure and its gradient are proposed to evaluate comprehensively the actual sealing condition of the bushing, and a wireless oil pressure module is developed at the bottom valve, which is quite beneficial to field online application. It is promising to extend the online mechanical monitoring and diagnosis to oil-immersed power equipment.

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“…Heat in the switchgear is generally produced because of the resistance in the conductive loop. Ignoring the change of copper resistivity caused by temperature variation, the resistance of copper bus-bars is obtained by formula (6) and the contact resistance especially at the plum blossom contact is calculated by formula (7) [10] R e ¼ ρ l S ðΩÞ ð6Þ…”

Section: Influence Of Contact Resistance On Temperature-risementioning

confidence: 99%

Precise multi‐dimensional temperature‐rise characterisation of switchgear based on multi‐conditional experiments and LPTN model for high‐capacity application

Wang

Xia

et al. 2020

High Voltage

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As the power load increases, the capacity of switchgear becomes larger so the problem of overheating of switchgears becomes more significant. Whether the switchgears operate safely and reliably affects the reliability and economy of the entire power system. Different methods have been tried to study the thermal problems of switchgears. However, there are few experimental studies on the switchgear entity. In this study, a series of temperature rise tests were carried out on medium‐voltage high‐capacity switchgear to explore laws of temperature rise. First, five groups of multi‐conditional experiments were carried out including changes of the load current, ventilation conditions and loop resistance. Then, multi‐dimensional temperature‐rise characterisation was analysed based on the experimental results and the relating theory. Finally, a circuit‐based lumped‐parameter thermal network (LPTN) model was developed by analysing the heat dissipation in switchgear and used to determine the steady‐state temperature distribution of the switchgear. The model is verified by comparing the simulation results with the experimental results.

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Calculation of Hot Spot Temperature of Transformer Bushing Considering Current Fluctuation

Cited by 17 publications

References 11 publications

Evaluation Method of 500kV Transformer Bushing Insulation State Based on Active Power Loss

Evaluation Method of 500kV Transformer Bushing Insulation State Based on Active Power Loss

Oil Pressure Monitoring for Sealing Failure Detection and Diagnosis of Power Transformer Bushing

Precise multi‐dimensional temperature‐rise characterisation of switchgear based on multi‐conditional experiments and LPTN model for high‐capacity application

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