Hot spot temperature models based on top-oil temperature for oil immersed transformers

Li, Jian; Jiang, Tianyan; Grzybowski, S.

doi:10.1109/ceidp.2009.5377876

Cited by 16 publications

(10 citation statements)

References 11 publications

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“…For on-line temperature monitoring it is suitable to calculate hot-spot temperature using differential equation with load factor and ambient temperature as a time variables [1]. Realtime algorithm is developed using concept with differential equation from IEC 60076-7 standard, since it is suitable for on-line monitoring [3]. Load factor and ambient temperature are time dependent variables and there is no limit regarding loading profile.…”

Section: Temperature Monitoring Of Power Transformersmentioning

confidence: 99%

“…On-line models are focused on the main tank of transformer [3]. These models rely on various sensors installed on the transformer and in the substation, combined with other manually entered parameters.…”

Section: On-line Diagnostics Modelsmentioning

confidence: 99%

“…Other solution relay on mathematical model of transformer and uses calculation of the highest temperature in transformer (e.g. the hot-spot temperature), measuring only transformer top-oil temperature and load current [3].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Industrial wireless sensor networks as a tool for remote on-line management of power transformers' heating and cooling process

Nikolić

Nešković²,

Antic

et al. 2017

FACTA U EE

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Industrial Wireless Sensor Network used for supervising of high power transformer cooling system is presented in the paper. Due to the fact that in the thermal power plant where industrial prototype is installed is very noisy environment, a lot of problems should be solved in order to obtain high reliability and accuracy of the system. Results of the analysis presented in paper are obtained from the real thermal power plant where presented wireless sensor network based on-monitoring system is used for continuous management of power transformers' heating and control of their cooling systems. Obtained results during system operation in longer period confirm its stability, accuracy and improvement in power plant operation.

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Section: Temperature Monitoring Of Power Transformersmentioning

confidence: 99%

Section: On-line Diagnostics Modelsmentioning

confidence: 99%

See 1 more Smart Citation

Industrial wireless sensor networks as a tool for remote on-line management of power transformers' heating and cooling process

Nikolić

Nešković²,

Antic

et al. 2017

FACTA U EE

View full text Add to dashboard Cite

show abstract

“…As a result of measurements, when a critical or significant change is observed in the properties of the oil, necessary measures can be taken. In the literature, there are many methods and studies used to diagnose dielectric performance of transformer oils, and experience in this field has been standardized [32][33][34][35][36][37][38][39][40]. However, the situation of transformer boards (TB) used for both insulation and cooling purposes is more complex than transformer oils.…”

Section: Introductionmentioning

confidence: 99%

Determination of transformer board creep parameters under high‐mechanical and thermal stresses

Arabul

Kumru

Arabul

2020

IET Science Measure & Tech

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During operation of a transformer, all components inside the transformer begin to age and lose their performances due to various stresses. Among these components, transformer boards (TB) used between windings have an important role in terms of equipment reliability for being used for both insulation and cooling purposes. TBs are exposed to all sorts of specified stresses during operation and their physical structure deteriorates by creeping over time. This deterioration leads to a decrease in the gap between winding turns, and insulation failures occur due to insufficient cooling. In order to prevent these types of failures, it is quite important to specify creep characteristics of TBs before the production particularly for high‐mechanical and thermal stresses. In this study, creep parameters (secondary creep rate, time to breakdown) of TB samples used in a typical power transformer under various loading and temperature are determined experimentally. In addition, gradient values are calculated for fitted lines and results obtained evaluated in terms of transformer operating conditions. Creep data obtained under high temperature (90, 100 and 110°C) and loading (30, 35 and 40 kg) makes an important contribution to literature and will help transformer manufacturers in design and production stages.

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“…The life of the power transformer is suggested to be 7.4 years of 50% retained tensile strength and 15.4 years of 25% retained tensile strength of the thermally upgraded kraft paper with the hot spot temperature of 110℃; which are under the ambient temperature of 30℃, the average winding temperature rise limit of 65℃ and the hot spot temperature rise of 15℃ [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

A Study on the Hot Spot Temperature in 154kV Power Transformers

Kweon¹,

Koo²,

Woo³

et al. 2012

Journal of Electrical Engineering and Technology

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-The life of a power transformer is dependent on the life of the cellulose paper, which influenced by the hot spot temperature. Thus, the determination of the cellulose paper's life requires identifying the hot spot temperature of the transformer. Currently, however, the power transformer uses a heat run test is used in the factory test to measure top liquid temperature rise and average winding temperature rise, which is specified in its specification. The hot spot temperature is calculated by the winding resistance detected during the heat run test. This paper measures the hot spot temperature in the single-phase, 154kV, 15/20MVA power transformer by the optical fiber sensors and compares the value with the hot spot temperature calculated by the conventional heat run test in the factory test. To measure the hot spot temperature, ten optical fiber sensors were installed on both the high and low voltage winding; and the temperature distribution during the heat run test, three thermocouples were installed. The hot spot temperature shown in the heat run test was 92.6℃ on the low voltage winding. However, the hot spot temperature as measured by the optical fiber sensor appeared between turn 2 and turn 3 on the upper side of the low voltage winding, recording 105.9℃. The hot spot temperature of the low voltage winding as measured by the optical fiber sensor was 13.3℃ higher than the hot spot temperature calculated by the heat run test. Therefore, the hot spot factor (H) in IEC 60076-2 appeared to be 2.0.

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Hot spot temperature models based on top-oil temperature for oil immersed transformers

Cited by 16 publications

References 11 publications

Industrial wireless sensor networks as a tool for remote on-line management of power transformers' heating and cooling process

Industrial wireless sensor networks as a tool for remote on-line management of power transformers' heating and cooling process

Determination of transformer board creep parameters under high‐mechanical and thermal stresses

A Study on the Hot Spot Temperature in 154kV Power Transformers

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