Global Temperature Sensing for an Operating Power Transformer Based on Raman Scattering

Traditional monitoring methods cannot obtain the overall thermal information for power transformers. To solve this problem, a distributed fiber optic sensor (DFOS) was creatively applied inside an operating 35 kV power transformer by highly integrating with the electromagnetic wires. Then, the transformer prototype with totally global sensing capability was successfully developed and it was qualified for power grid application through the strict ex-factory tests. The as designed optical fiber sensor works stably all the time with a temperature accuracy of ±0.2 °C and spatial positioning accuracy of 0.8 m. Based on the obtained internal temperature distribution, Gaussian convolution was further applied for the signal processing and hereby, the hotspots for all the windings and iron cores could be accurately traced. The hottest points were located at 89.1% (55 °C) of the high voltage winding height and 89.7% (77.5 °C) of the low voltage winding height. The actual precise hotspot location corrected the traditional cognition on the transformer windings and it would serve as an essential reference for the manufactures. This new nondestructive internal sensing and condition monitoring method also exhibits a promising future for the DFOS applying in the high-voltage electrical apparatus industry.

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Idejno rešenje regionalnog Data Centra kod Beograda napajanog iz obnovljivih izvora energije

Energija, Ekonomija, Ekologija ◽

10.46793/eee21-3.10v ◽

2021 ◽

Vol 23 (3) ◽

pp. 10-17

Author(s):

Ivan Vujović ◽

Željko Đurišić ◽

Keyword(s):

High Voltage ◽

Power Supply ◽

Wind Farm ◽

Low Voltage ◽

Power Transformer ◽

Renewable Energy Sources ◽

Geographical Location ◽

Electrical Energy ◽

Economic Benefits ◽

Infrastructure Development

Telecommunications and computer equipment centralisation trends for the purpose of achieving economic benefits, usage of technological innovations and new technical solutions implementation leads to the requirements for building bigger Data Centres (DCs). An increase in the size of the DC facility i.e. the number of racks inside occupied with equipment and the number of devices that enables the proper functioning of that equipment leads to necessarily power energy requirements increasing for power supply. For the DCs that require a large amount of energy, the building of their own, usually renewable energy sources (RES) is cost-effective. In such a caser, RES are primary and Power System (PS) is secondary and redundant power source. A concept of a DC primary powered from RES is presented in this paper. Generated electrical energy in RES is transmitted in PS through high voltage switch-gears (SGs) while DC is power supplied from PS through low voltage, medium voltage and high voltage SG-s. For the purpose of realisation of such facility, it is necessary to enable adequate conditions related to geographical location, physical access to the facility, possibility of connecting to the PS and possibility of connecting to the telecommunications centres. Based on carried out researches related to RESs potential, available roads, power supply infrastructure and telecommunication infrastructure, development conditions for DC on location near to Belgrade, close to power transformer station „Belgrade 20“ are analysed in this paper. From the aspect of DC power supply, proposed solution includes wind farm, solar plant and landfill gas power plant, as well as related SGs. Telecommunication connections from DC to the PS and other important telecommunication centres are provided. These connections are realised through optical cables placed next to the electrical lines and cables, and, when that is not possible, placed independently in the ground. The design of the DC interior is given and calculations of the required electrical energy for the power supply of the equipment and devices in the facility are performed. Based on calculation results, capacity calculation of the RES and calculation of SGs are performed. Design of the interior optical connections inside DC is also given. A General assessment of the investment and economics of building such DC are given at the end of the paper.

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Study on Isolation Monitoring of High-Voltage Battery System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.44-47.571 ◽

2010 ◽

Vol 44-47 ◽

pp. 571-575 ◽

Cited By ~ 1

Author(s):

Chang Hao Piao ◽

Teng Cong

Keyword(s):

Real Time ◽

Electric Vehicle ◽

High Voltage ◽

Working Environment ◽

Monitoring Methods ◽

Monitoring Method ◽

Battery System ◽

High Voltage Battery ◽

Pros And Cons ◽

Working Principle

After comparing the pros and cons of various isolation monitoring methods, this article presents the isolation monitoring method which based on unbalanced bridge and the characteristics of high-voltage battery system. Battery is an important component for Hybird-electric vehicle. The safety of high-voltage battery system is important specification for Hybird-electric vehicle. This device which uses Freescale’s 16-bit microcontroller with CAN communications capabilities achieve real-time and accurate measurement of isolation resistance of high-voltage battery system. The article focuses on the working principle of the device, hardware design and software design. This device has high accuracy, real-time, reliability and good working environment adaptability. The measuring accuracy meets the requirement of actual project.

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Distributed monitoring method for upheaval buckling in subsea pipelines with Brillouin optical time-domain analysis sensors

Advances in Structural Engineering ◽

10.1177/1369433216659990 ◽

2016 ◽

Vol 20 (2) ◽

pp. 180-190 ◽

Cited By ~ 11

Author(s):

Xin Feng ◽

Wenjing Wu ◽

Dewei Meng ◽

Farhad Ansari ◽

Jing Zhou

Keyword(s):

Axial Force ◽

Fiber Optic ◽

Complex Loading ◽

Time Domain Analysis ◽

Fiber Optic Sensor ◽

Distributed Monitoring ◽

Monitoring Method ◽

Upheaval Buckling ◽

Distributed Fiber Optic Sensor ◽

Longitudinal Strains

A method for monitoring the upheaval buckling of subsea buried pipelines by distributed optical fiber sensors is introduced. The proposed method originates from the fact that the bucked pipe has the deterministic patterns of the bending-induced and axial force–induced strains, which can be used to identify the pre- and post-buckling states of the pipe. The challenge for utilizing these features is that the distributed fiber optic sensor can only measure the compound strain created by both bending and axial compression. A monitoring scheme by placing three sensors with [Formula: see text] space around the circumference of the pipeline was proposed in this article. An approach was presented to extract the bending-induced and axial force–induced strains from the longitudinal strains measured by the distributed fiber optic sensors. The experimental programs were then designed to investigate the feasibility of the proposed method. It is demonstrated that the proposed method is possible to detect the occurrence of buckling in the pipe. However, further research is necessary in order to examine the efficiency of the proposed approach under the complex loading patterns at subsea levels.

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An Application of BOTDR to the Measurement of the Curing of a Bored Pile

Applied Sciences ◽

10.3390/app11010418 ◽

2021 ◽

Vol 11 (1) ◽

pp. 418

Author(s):

Lei Gao ◽

Chuan Han ◽

Omar Abdulhafidh ◽

Yunhao Gong ◽

Yingjie Jin

Keyword(s):

Fiber Optic ◽

Fiber Optic Sensor ◽

Monitoring Method ◽

Optical Time Domain Reflectometer ◽

Bored Pile ◽

Sensing Technology ◽

Reliable Monitoring ◽

Distributed Fiber Optic Sensor ◽

Optical Time ◽

Pile Deformation

In order to study the deformation of a bored pile during concrete curing, it is necessary to monitor the strain of the pile. In this paper, Brillouin optical time domain reflectometer (BOTDR) technology is used to monitor the pile strain during concrete curing, and reliable monitoring data are obtained. These data provide a basis for the study of pile deformation and pile–soil interaction during curing of bored cast-in-place piles. Compared with the traditional point strain sensor, the distributed fiber optic sensor is simple in layout and highly accurate; it can fully reflect the strain changes of the pile; the experiment also shows the advantages of distributed fiber optic sensing technology over the traditional point monitoring method.

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A fiber optic sensor for the detection of Partial Discharge within the High Voltage power transformer

Foundations and Frontiers in Computer, Communication and Electrical Engineering ◽

10.1201/b20012-38 ◽

2016 ◽

pp. 177-181 ◽

Cited By ~ 1

Author(s):

B Sarkar ◽

C Koley ◽

N Roy ◽

P Kumbhakar

Keyword(s):

High Voltage ◽

Fiber Optic ◽

Power Transformer ◽

Partial Discharge ◽

Fiber Optic Sensor ◽

Optic Sensor

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A hybrid fiber-optic sensor system for multi-stress monitoring of high-voltage power transformer

10.1117/12.975129 ◽

2012 ◽

Author(s):

Hyunjin Kim ◽

Hyoung-jun Park ◽

Minho Song

Keyword(s):

High Voltage ◽

Fiber Optic ◽

Power Transformer ◽

Fiber Optic Sensor ◽

Sensor System ◽

Stress Monitoring ◽

Hybrid Fiber ◽

Optic Sensor

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Dynamic Monitoring of Low Voltage Distribution Network Leakage Detection Device Based on Internet of Things Technology

E3S Web of Conferences ◽

10.1051/e3sconf/202125201006 ◽

2021 ◽

Vol 252 ◽

pp. 01006

Author(s):

Yang Wang ◽

Shiqing Wang

Keyword(s):

Internet Of Things ◽

Low Voltage ◽

Distribution Network ◽

The State ◽

Dynamic Monitoring ◽

Leakage Detection ◽

Voltage Distribution ◽

Monitoring Methods ◽

Monitoring Method ◽

Internet Of Things Technology

The existing dynamic monitoring methods of low-voltage distribution network leakage detection device have been unable to meet the needs of the distribution network in China. Therefore, a dynamic monitoring method of low-voltage distribution network leakage detection device based on Internet of Things technology is proposed. Based on the introduction of the Internet of Things technology sensor sensing technology, the sensor is installed on the leakage detection device to obtain the operation data of the leakage detection device and preprocess it with noise reduction and normalization. At the same time, the statistical analysis of partial discharge signal is carried out to extract the characteristics of fast waveform signal (energy parameters, sample entropy and modal components). Based on the operation data features of the leakage detection device extracted above, the state diagnosis framework of the leakage detection device is built to diagnose the state of the leakage detection device, and the dynamic monitoring of the leakage detection device in low-voltage distribution network is realized. The experimental results show that: compared with the existing methods, the proposed method has stronger anti-interference ability and smaller monitoring error, which fully proves that the proposed method has better application effect.

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