Online identification of power transformer and transmission line parameters using synchronized voltage and current phasors

2022 ◽  
Vol 203 ◽  
pp. 107638
Author(s):  
Mohammad Reza Rezaei ◽  
Seyed Reza Hadian-amrei ◽  
Mohammad Reza Miveh
Keyword(s):  
Transmission Line ◽  
Power Transformer ◽  
Online Identification

Application of an Improved Multi-Conductor Transmission Line Model in Power Transformer

2013 ◽  
Vol 49 (5) ◽  
pp. 2029-2032 ◽  
Author(s):  
Qiuhui Zhang ◽  
Shuhong Wang ◽  
Jie Qiu ◽  
Xuelong Jing ◽  
Chuang Gao ◽  
...  
Keyword(s):  
Transmission Line ◽  
Power Transformer ◽  
Transmission Line Model ◽  
Line Model

scholarly journals 1 X 1000 kVA Transformer Measurement Analysis using Dyn-11 Vector Group and Off Load Tap Changer

2021 ◽  
Vol 1 (2) ◽  
pp. 73-80
Author(s):  
Setiyo Budiyanto ◽  
Lukman Medriavin Silalahi ◽  
Freddy Artadima Silaban ◽  
Adi Kurnia ◽  
Agus Dendi Rochendi ◽  
...  
Keyword(s):  
Transmission Line ◽  
Power Transformer ◽  
Electrical Energy ◽  
Input Voltage ◽  
Measurement Tool ◽  
Measuring Instrument ◽  
Ratio Measurement ◽  
Control Center ◽  
Transformer Ratio ◽  
The Impact

The transmission line of electrical energy generated by the power plant is usually located far from the load center to be distributed to the community. The substation is part of a distribution transmission line that acts as a control center and consists of a collection of extra high voltage equipment. Routine maintenance of the power transformer as the main equipment of the substation must be scheduled so that its performance remains reliable. The proposed method of this research is to analyze the condition of the transformer through testing when it is off, to the calculation of the transformer ratio to determine the condition of the transformer windings using the calculation of the formula and measurement of the Raytech Transformer Turn Ration measuring instrument. In this research, the Raytech Transformer Turn Ratio measurement tool is used to determine the ratio of the winding input voltage of 20,000 volts and the output voltage of 400 volts on the power transformer. At a voltage of 40VAC, from the results of the comparisons that have been made, it can be seen that the test results of the Raytech Transformer Turn Ratio measuring instrument, if it crosses the 0.5% tolerance limit, the measurement results on one of the coils change the ratio. If the transformer is not regularly checked, the impact will result in unbalance of voltage on one of the coils. And one of the coils in phase will expand and cause a loss of voltage.

scholarly journals Ultraviolet Imaging Techniques for Off-Line Condition Monitoring of Power System Equipment

2020 ◽  
Author(s):  
Khawla Saeed Salim Al-Khawaldi ◽  
Ohood Khamis Suwaid Al-Maqbali ◽  
Fatema Khamis Rashid Al Maamari ◽  
Bashayar Saif Said Al Khawaldi ◽  
Murali Krishna Boddu
Keyword(s):  
Power System ◽  
Transmission Line ◽  
Corona Discharge ◽  
Distribution System ◽  
Power Transformer ◽  
Imaging Techniques ◽  
Electrical Equipment ◽  
International Standards ◽  
Contactless Measurement ◽  
Economic Point

By using appropriate method to detect the functioning state of electrical equipment is always significantly more concerned with operational and economic point of view. With invention of the instruments which can capture images at Ultraviolet and infrared wavelength gives the required information for perceiving condition of the particular power system equipment with contactless measurement of parameters which leads the system to abnormal condition. Thermal, Corona images are those of such kind will be useful for the offline monitoring of the complex power system equipment where human cannot go and observe the actual status while system is under energized state. The equipment’s mainly Power transformer, insulators, Circuit breakers, transmission line connection of power system are to be examined correctly. Thermal Imaging mainly gives the temperature raise of the component of the equipment and from that data is useful in analyzing the reasons and process for scheduled preservation before the disorder of the system. The corona discharge will cause the waste of power energy, radio interference, audible noise, insulation aging, and these defects are great threats to the safety and stability of electrical equipment. The different corona discharge defect part of high voltage electrical equipment is Listed such as the grading ring, drop wire, jumper and over line, spacing rods, tube bus end and connecting joint. While the photon numbers of corona discharge under different defects are measured by the ultraviolet imager called as corona image. The analysis is conducted for a 33KV/11KV primary substation of a Distribution system along with secondary transmission line for thermal and Corona imaging. Infra-red Thermal camera and Ultraviolet Corona camera are used for the taking images at the substation. Thus, obtained data is compared with respective international standards for taking appropriate schedule for maintenance or clearance of the effected equipment at the earliest time possible to get the consumer with uninterruptable power supply.

Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20502
Author(s):  
Behrokh Beiranvand ◽  
Alexander S. Sobolev ◽  
Anton V. Kudryashov
Keyword(s):  
Transmission Line ◽  
Terahertz Radiation ◽  
Transmission Lines ◽  
Software Package ◽  
Optical Pulses ◽  
Capacitively Coupled ◽  
Voltage Difference ◽  
Left Handed ◽  
Microwave Transmission ◽  
Commercial Software Package

We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.

Effect of No-load and Load Condition on Transformer Sound

2018 ◽  
pp. 11-15
Author(s):  
Dr. Hitesh Paghadar
Keyword(s):  
Experimental Study ◽  
Power Transformer ◽  
Load Condition ◽  
Noise Pollution ◽  
Sound Level ◽  
Measurement Scale ◽  
Dominant Factor ◽  
Public Attention ◽  
Level Measurement ◽  
Human Ear

Increasing environment noise pollution is a matter of great concern and of late has been attracting public attention. Sound produces the minute oscillatory changes in air pressure and is audible to the human ear when in the frequency range of 20Hz to 20 kHz. The chief sources of audible sound are the magnetic circuit of transformer which produces sound due to magnetostriction phenomenon, vibration of windings, tank and other structural parts, and the noise produced by cooling equipments. This paper presents the validation for sound level measurement scale, why A-weighted scale is accepted for sound level measurement, experimental study carried out on 10MVA Power Transformer. Also presents the outcomes of comparison between No-Load sound & Load sound level measurement, experimental study carried out on different transformer like - 10MVA, 50MVA, 100MVA Power Transformer, to define the dominant factor of transformer sound generation.

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