scholarly journals A Comprehensive Procedure for the Partial Discharge Measurements & Power Frequency Withstand Test on GIS in Transmission Substations

2021 ◽  
Vol 10 (4) ◽  
pp. 124-128
Author(s):  
Mr. Shaik Mohammad Tayyab ◽  
◽  
Prof. K. Chandra Sekhar ◽  
Keyword(s):  
High Voltage ◽  
Power Plants ◽  
Power Transmission ◽  
Partial Discharge ◽  
Life Time ◽  
Power Sector ◽  
Transmission Part ◽  
Huge Impact ◽  
Power Frequency ◽  
Utmost Care

The Transmission part of the power sector is very much important as it deals with the huge losses of the complete power sector. Transmission substations play a key role in the power transmission process since the power generation at the power plants to the final stage at the consumer end utilization. The utmost care should be taken to protect these transmission substations as same as the care is taken to reduce the losses. The substation needs to be protected from blackouts which is the big problem of substations. For this, the substation high voltage equipment’s like GIS & Power Transformers are to be properly installed & energized according to the standards & care is taken for its maintenance. So, during the commissioning process which is after installation & before energization, there are different tests which are performed on high voltage equipment’s, especially the Gas Insulated Switchgear, in which the High Voltage & Partial discharge has huge impact as the ageing and the life time of GIS can be easily assessed & the GIS can be saved from the damage, tripping and the blackout of a substation. The procedure of the high voltage test and the partial discharge tests are clearly explained in this paper.

scholarly journals Degradation of stator insulation of high-voltage asynchronous machines in gamma and neutron radiation field

2019 ◽  
Vol 34 (3) ◽  
pp. 264-271 ◽  
Author(s):  
Nenad Kartalovic ◽  
Bojan Jokanovic ◽  
Milan Bebic ◽  
Djordje Lazarevic
Keyword(s):  
Gamma Radiation ◽  
High Voltage ◽  
Power Plants ◽  
Asynchronous Motor ◽  
Life Time ◽  
Neutron Radiation ◽  
Time Duration ◽  
Asynchronous Machines ◽  
Asynchronous Motors ◽  
Time Exponent

This paper presents the results of an examination of function stability of high-voltage asynchronous motors exposed to ambient strain caused by combined neutron and gamma radiation. This problem appears in practice when a high-voltage asynchronous motor is used in nu- clear power plants where it can be exposed to this type of ambient strain. The failure of the engine's operation under such conditions may have unexpected consequences. As more than 50 % of failure (malfunction) of high-voltage asynchronous motors is caused by damage to stator insulation, the focus of the paper was on testing the effects of combined neutron and gamma radiation on stator insulation. The tests were carried out under well-controlled laboratory conditions on samples taken from both new and used factory coil windings. Two-layer samples were used to record partial discharge threshold voltage and breakdown voltage. By comparing the experimentally obtained results with the applicable mathematical-statistical procedure, an estimate was made of the aging acceleration of stator insulation and the time duration of reliable operation of high-voltage asynchronous motor was determined by life-time exponent.

scholarly journals Resonant Power Frequency Converter and Application in High-Voltage and Partial Discharge Test of a Voltage Transformer

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 2014
Author(s):  
Banyat Leelachariyakul ◽  
Peerawut Yutthagowith
Keyword(s):  
High Voltage ◽  
Noise Level ◽  
Background Noise ◽  
Low Voltage ◽  
Frequency Converter ◽  
Partial Discharge ◽  
Voltage Source ◽  
Voltage Transformer ◽  
Background Noise Level ◽  
Power Frequency

This paper presents application of a resonant power frequency converter for high-voltage (HV) and partial discharge (PD) test of a voltage transformer. The rating voltage, power, and frequency of the system are 70 kVrms, 40 kVA, and 200 Hz, respectively. The testing system utilized the converter feeding to an HV testing transformer connected to a conventional partial discharge detection system. The converter system comprising a rectifier and insulated-gate bipolar (IGBT) switches with the H-bridge configuration was applied as a low-voltage source instead of a conventional motor-generator test set which requires large space and high cost. The requirements of the test according to the standards are quality of the test voltage and the background noise level. The required voltage must have the different voltage (DV) and total harmonic distortion (THDv) in the acceptable values of less than 5%. The DV is defined as the difference of the root mean square and peak voltages in percent. The required background noise level must be lower than 2.5 pC. Simulations and experiments were performed for verification of the developed system performance in comparison with those of the previously developed system based on the pulse width modulation converter. It is found that the developed system can provide the testing voltage with the DV and the THDv of lower than 1% and the background noise level of lower than 1 pC. Considering this achievement of promising performance, the developed system is an attractive choice for the HV and PD testing of voltage transformers in real practice.

scholarly journals A REVIEW OF STUDY AND PERFORMANCE OF PARTIAL DISCHARGE FOR DIFFERENT TYPE OF INSULATION MATERIALS

2020 ◽  
Vol 5 (12) ◽  
pp. 156-159
Author(s):  
Khushboo Patareya ◽  
Arun Pachori
Keyword(s):  
Epoxy Resin ◽  
High Voltage ◽  
Power Transmission ◽  
Partial Discharge ◽  
Insulation Material ◽  
High Quality ◽  
Insulation Materials ◽  
Voltage Application ◽  
And Performance

The insulation should be high quality for power transmission and high voltage application, in this way we are studying about the various type of insulation material such as epoxy resin, vulcanized fibres and polyethylene which are having different capacitance value, the power transmission equipment’s has less efficiency due to degradation of insulation material. In this paper, we are studying the partial discharge for the different type of insulation materials.

scholarly journals Nigerian Power Sector: A new structure required for effective and adequate power generation, transmission and distribution

2021 ◽  
Vol 1 (1) ◽  
pp. 06-018
Author(s):  
Ebigenibo Genuine Saturday
Keyword(s):  
Power Generation ◽  
Electric Power ◽  
Federal Government ◽  
State Government ◽  
Power Distribution ◽  
Power Plants ◽  
Power Transmission ◽  
State Governments ◽  
Power Sector ◽  
Transmission And Distribution

In this paper, the structure of the Nigerian power sector is examined, the problems in the structure are identified and a new structure is proposed for effective power generation, transmission and distribution. Besides the problems usually canvassed, the current structure is defective from the perspective of the ownership of the power infrastructures, passive involvement of state governments and undue influence of the federal government. The reforms in the sector were driven by the Electric Power Sector Reform Act (EPSRA) of 2005, leading to the creation of Power Holding Company of Nigeria (PHCN) to take both the assets and the liabilities of the then National Electric Power Authority (NEPA), and the subsequent unbundling of PHCN to 18 successor companies – 6 power generating companies, one power transmission company and 11 power distribution companies. The new structure proposed in this work gives room for every state government to own power plants and distribute power in the various states. They can equally buy power from independent power producers. Power plants owned by the federal government in the present structure are to continue sending power to the national grid and made available to states with insufficient power generation in the new structure. Independent power producers can also send power to the national grid. The federal government will continue managing power transmission in the new structure. Each state government will own at least two power distribution companies in partnership with private organizations who will equally have a stake in the ownership of the power generating plants. The tariff of grid-connected power will be higher, encouraging states to go into active power generation. The new structure will enable the federal government to do away with rural electrification programme and other power generation options regulated by the Nigerian Electricity Regulatory Commission which should be under the control of various state governments. New laws are needed in the place of the EPSRA to achieve the new structure. The federal government will make money from the proposed structure instead of spending huge sums of money in the present structure.

Challenges, trade-offs, and opportunities in the design of power transmission lines: a water-energy perspective

2020 ◽  
Author(s):  
Stefano Galelli ◽  
AFM Kamal Chowdhury ◽  
Thanh Duc Dang
Keyword(s):  
High Voltage ◽  
Transmission Lines ◽  
Power Plants ◽  
Fossil Fuels ◽  
Power Transmission ◽  
Climatic Variability ◽  
Climatic Conditions ◽  
Management Interventions ◽  
Trade Offs ◽  
High Voltage Transmission

<p>High-voltage transmission lines provide the fundamental service of delivering electricity over long distances, connecting power plants to demand centers. Their role is particularly critical in energy systems characterized by the presence of hydropower, and other renewable resources, whose output exhibits trends and shifts in response to hydro-climatic variability. Yet, the design and operation of transmission networks is rarely placed within a broad water-energy context, often resulting in infrastructures unable to dispatch the available power during peak-production periods. The case in point is Laos: the country has attracted large investments in the hydropower sector, but their effectiveness is severely limited by the capacity of the high-voltage transmission facilities. Here, we show how such challenge could be tackled through the use of process-based models describing the interconnections between water, energy, and power transmission components. Specifically, we run our modelling framework over a broad range of hydro-climatic conditions, so as to identify the transmission lines severely limited by their capacity. With this information at hand, we then explore the potential of both design and management interventions. Potential solutions include the capacity expansion of a few transmission lines and the adoption of a wide area synchronous grid, which facilitates electricity exchange across Laos and Thailand. Results show that both solutions are cost-effective: they require limited investment costs and reduce reliance on fossil fuels, resulting in a significant abatement of CO<sub>2 </sub>emissions.</p>

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