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Presence of void usually initiate the partial discharges activity in the insulator. Heat and other form of energy are released during discharges activity which eventually lead to degradation of insulator. It is very important to detect the presence of discharges activity in order to carry out proper preventive maintenance. In this paper, the temperature distribution pattern is investigated in relation...
In order to take advantage of the assets, Insulator U 120 B Normal hereinafter “Insulator A” and Insulator U 120 BP Anti-Fog hereinafter “Insulator B” are planned to use for 150kV Transmission Line but the result of PLN Research Institute for Sample Test was failed only in Electromechanical Failing Load Test. In order to immediately need and emergency case with availability of Insulator A and Insulator...
This paper deals with the magnetic field analysis of 150 kV compact transmission line. The 150 kV compact transmission line is constructed by reusing existing right of way, occupied by existing distribution lines. The 150 kV compact transmission line is designed by mutual utilization of the 150 kV transmission line with 20 kV distribution line. The consideration of the dimension of 150 kV compact...
This paper presents a study of the lightning performance of subtransmission lines located in high ground flash density areas according to the design of the grounding systems. Analysis of the behavior of 69 kV and 138 kV lines under direct lightning strokes is performed for grounding systems dimensioned based on a fixed value of the low frequency resistance established by Brazilian regulations, and...
Optical systems and Optical Fiber Sensors offer a decisive solution to monitor critical parameters in presence of high electromagnetic interferences as in the case of the T&D network. These sensors can operate safely and, therefore, they are suitable for integration and security application to on-service electrical equipment. In this work we report some examples of RSE optical systems and sensors...
The aim of this article is to analyze the investment and operational costs (the costs discounted) of the medium-voltage overhead lines with covered conductors as a function of applied overvoltage protection. On the basis of a technical-economic comparative analysis of the most popular and prospective protection measures, two surge protection systems (whose use is economically justified) will be further...
The problem of surface charge accumulation on gas-insulator interface is one of the critical factors for the insulation of DC-GIL. A GIL experiment platform which can heat central electrode with variable temperature is built to investigate the surface charge under different temperature. The surface potentials of insulator at different temperature under negative voltage are measured and the effect...
In the operation of HVDC GIL (Gas-insulated Transmission Line), cone-type insulator can separate SF6 chambers, support the HV conductor and play the role of electric insulation. However, with long-term applied HVDC voltage, charges are prone to accumulate on the insulator surface, which can lead to the decrease of flashover voltage and threaten the stability of power system. Besides, the existence...
Since GIS bushings are keeping the conducting lines being insulated from the ground and decreasing the intensified electric field strength, its safe and reliable operation are extremely important. However, the complicated structure and high electric field strength are making the structural optimization of bushings necessary. In this paper, the basic principles and process of the newly-presented artificial...
In the field of high voltage live line maintenance RTE can rely on many methods for ordinary operations like replacing insulators, line hardware, or repairing damaged conductors. Nevertheless heavier maintenance is sometimes needed such as tower replacement. Therefore RTE has developed a new piece of equipment able to temporarily support the line while the tower is removed. This tool consists of a...
In many cases insulators are used mounted to utility pole cross-arms. Existing cross-arm materials such as wood, steel and fiber reinforced polymer (FRP) are showing signs of deterioration. In some cases, these other materials can be extremely heavy and difficult to handle or transport into remote access line locations. The Totally Insulated Framing (TIF) System recently developed offers a new cross-arm...
We intend to show in this paper, the development of new live line working tools (LLWT), that we were forced to develop in the company when moving on live line working (LLW) from 13.2 kV. to 33 kV. systems. Moving to a higher voltage level, faced some problems to solve.
Power system needs to be functioned at the designed capacity, security with high availability. To make Power system functioned properly, line outages should be made zero; for this continuous on line monitoring and suitable maintenance techniques utilized. This paper shows various Transmission Lines Maintenance techniques available and maintenance techniques presently utilized in India. For the instant...
Icing disaster about transmission line has affected the safety of power network. At present, weighing method is an important method and technology for on-line icing-monitoring system, which uses the force transducer to monitor the change of pulling force about the insulator string in order to reflect the wire icing status. However, calculation formula of ice thickness used by many companies not only...
Lightning strokes cause mainly outages of transmission lines. A lightning study takes into consideration possible impacts of lightning strokes on transmission systems. The lightning performance of multi-circuit transmission tower with AC and DC circuits is investigated. Till today lightning analysis of HVDC and HVAC systems were done separately. Since both systems will be installed on the same tower,...
This paper presents preliminary results related to the impulse breakdown characteristics of XLPE-covered cables. Tests with standard lightning impulse voltages (1.2/50 μs) applied to a typical single-phase structure employed in compact distribution lines used in Brazil were performed. Results in terms of breakdown voltage, time to breakdown and pinhole location are presented.
The aim of the paper is to use computer simulation to analyze the electric field distribution on the surface of loop-shaped long-flashover arrester. The 3D model of the arrester was built in a computer program Comsol. On the basis of the simulation results the device was modified to obtain a better distribution of the electric field. This modification was aimed at cost minimization assuring the high...
The safety operation of UHV transmission lines is important to the power grid and live working technology is a key method to cope with line components defects or fault without outage plan. In order to ensure the safety of live line workers and electrical equipment, the workers entering into equal-potential must select proper accessing path and satisfy the requirement of minimum complex gaps. Live...
Live working technology is to ensure the safe operation of UHV transmission lines is an important technical means, and the security and stability to equal-potential is a key link for live working. UHV line tension insulator string length, the distance between united and dip Angle, etc is bad for workers along the insulator into the equal-potential. For workers from jumping into the equal-potential...
Insulation parts exist in dc wall bushing. During normal operation, insulation parts through the constant current conduction cannot as ideal insulator, so can't simply calculate the electric field in electrostatic field theory, otherwise cause calculation error, and even made bushing structure design errors. In order to study the ac and dc field different influence on bushing electric field. The calculation...
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