Bragg system for temperature monitoring in distribution transformers

Picanco, A. F.; Martinez, M.L.B.; Rosa, Paulo C.

doi:10.1016/j.epsr.2009.08.013

Cited by 22 publications

(11 citation statements)

References 1 publication

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“…Currently, there are several ways to check transformer temperature such as the top oil temperature measuring methods [ 1 , 2 , 3 ], fluorescence optical fibre temperature measuring methods [ 4 , 5 ], fibre Bragg grating methods, etc. [ 6 , 7 , 8 , 9 ]. The measuring scope of the top oil temperature measuring method is small due to its low measurement accuracy; fluorescence optical fibre temperature measuring offers a higher measuring accuracy, but it is a point-type measure and is still limited in scope since the number of sensors has to be increased to measure different parts; the fibre Bragg grating method is a point-type measure though, in essence, it can make quasi-distributed measurements.…”

Section: Introductionmentioning

confidence: 99%

A Feasibility Study of Transformer Winding Temperature and Strain Detection Based on Distributed Optical Fibre Sensors

Liu

Yuan

Fan

et al. 2018

Sensors

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The temperature distribution and deformation of the transformer windings cannot be measured in a distributed manner by the traditional method and failure location cannot be performed. To solve these problems, we present a transformer winding temperature and strain based on a distributed optical fibre sensing detection method. The design of the optical fibre winding composite model is developed and simulated winding temperature rise test and local deformation test distinguish between measuring the winding temperature and the strain curve. The test results show that the distributed optical fibre can transmit wire strain efficiently. Optical fibres, in the process of winding, have a certain pre-stress. Using the Brillouin–Raman joint measuring method, one can effectively extract the optical fibre temperature and strain information and measure the length of the winding direction of the temperature and strain distribution curve to a temperature measurement precision of ±2 °C and strain detection accuracy of ±50 με. The system can carry out local hot spot and deformation localisation, providing new ideas for the transformer winding state monitoring technology.

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Section: Introductionmentioning

confidence: 99%

A Feasibility Study of Transformer Winding Temperature and Strain Detection Based on Distributed Optical Fibre Sensors

Liu

Yuan

Fan

et al. 2018

Sensors

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“…Consequently it is quite useful and necessary to obtain the accurate position and temperature of the hot‐spot in the winding. The fiber sensors can be surface mountable and embedded in cross‐over block on the measurement of the internal winding temperature of transformers .…”

Section: Measurement Of Winding Temperature In 35 Kv/4000 Kva Oil‐immmentioning

confidence: 99%

Hot‐spot temperature and temperature decay rate measurement in the oil immersed power transformer through FBG based quasi‐distributed sensing system

Deng

De-xin

Benxi

et al. 2016

Micro & Optical Tech Letters

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This work demonstrates a quasi‐distributed sensing method to obtain the accurate location and temperature value of hot‐spot by placing Fiber Bragg Grating sensors in the conductor wires of transformer's windings. The quasi‐distributed temperature measuring system can support the demodulation of up to 218 FBGs, and has the ability to obtain the temperature decay rates of windings, strips, iron cores, and top oil in a 35 kV/4000 kVA oil immersed power transformer through a temperature‐rise test. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:472–475, 2017

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“…The rated hot-spot temperature rise over top-oil temperature rated , hs θ Δ is shown in (11), where H is the hot-spot factor; g r is the rated average winding to average oil temperature gradient. r rated , hs g H × = Δθ (11) The parameter for our 25 kVA transformer was assumed having the same per unit values of parameters (P cu,dc,pu , P cu,eddy,pu ) of the 25 MVA transformer in [18].…”

Section: B Hot-spot Temperature Modelmentioning

confidence: 99%

“…r rated , hs g H × = Δθ (11) The parameter for our 25 kVA transformer was assumed having the same per unit values of parameters (P cu,dc,pu , P cu,eddy,pu ) of the 25 MVA transformer in [18]. τ wdg,rated was set as 6 minutes, and τ oil,rated was set as 150 minutes [18] [5].…”

Section: B Hot-spot Temperature Modelmentioning

confidence: 99%

“…Despite the new methods proposed, direct measurement of winding temperature with fiber optic remains the best methodology. In [11] the authors propose a pilot design of a distribution transformer monitor using Fiber Bragg Grating (FBG) technology to determine the temperature at 12 points distributed along the LV (Low Voltage) and HV (High Voltage) coils employing three optical fibers. A 100 kVA single-phase distribution transformer was utilized in order to accurately find and measure the hot-spot.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Distribution transformer tests for PEV smart charging control

Gong

Midlam-Mohler

Serra

et al. 2012

2012 IEEE Energytech

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Unregulated PEV (Plug-in Electric Vehicle) charging will have great impact on current power grid system especially on the distribution transformer system. In our previous work, a PEV smart charging control strategy was proposed with the objective of minimizing residential distribution transformers loss of life leveraging a transformer thermal model. In this work, we validate and calibrate that transformer thermal model, through some testing campaigns conducted on an off-the-shelf transformer. The novelty of the presented experimental approach consists in measuring the oil temperature simulating the high voltage AC environment inside the transformer by means of a low voltage DC environment. This allows measuring the temperature through thermocouples. To this point, initial experiment tests for the top oil temperature measurement allowed us to validate the top oil thermal model. In the future, winding temperature will be measured and the charging strategy will be validated

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Bragg system for temperature monitoring in distribution transformers

Cited by 22 publications

References 1 publication

A Feasibility Study of Transformer Winding Temperature and Strain Detection Based on Distributed Optical Fibre Sensors

A Feasibility Study of Transformer Winding Temperature and Strain Detection Based on Distributed Optical Fibre Sensors

Hot‐spot temperature and temperature decay rate measurement in the oil immersed power transformer through FBG based quasi‐distributed sensing system

Distribution transformer tests for PEV smart charging control

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