Counterpoise Mutual Voltage and Its Impacts on the HV Transmission UGOH Pole Earth Potential Rise

2015 ◽  
Vol 16 (3) ◽  
pp. 233-241 ◽  
Author(s):  
Mohamad Nassereddine ◽  
Jamal Rizk ◽  
Mahmood Nagrial ◽  
Ali Hellany
Keyword(s):  
Transmission Line ◽  
System Design ◽  
High Voltage ◽  
Transmission Lines ◽  
Low Cost ◽  
Safety Compliance ◽  
Solid Part ◽  
Earth Potential

Abstract High-voltage earthing system design is required to ensure safety compliance and adequate operation of the high-voltage infrastructures. The transmission lines form a solid part of the high-voltage infrastructure. The underground to overhead (UGOH) pole earth grid is one of the main challenges when it comes to transmission line earthing system design. To ensure safety compliance at low cost, counterpoise earthing is used at the UGOH pole for the underground lines. The counterpoise aids in lowering the UGOH pole earth grid resistance. This paper addresses the counterpoise analysis as currently being studied. Furthermore, it introduces the counterpoise mutual voltage between the faulted phase and the counterpoise and its impact at the UGOH pole earth potential rise. Case study is included.

Fault Current Distribution and Pole Earth Potential Rise (EPR) Under Substation Fault

2013 ◽  
Vol 14 (5) ◽  
pp. 499-507 ◽  
Author(s):  
M. Nnassereddine ◽  
J. Rizk ◽  
A. Hellany ◽  
M. Nagrial
Keyword(s):  
Transmission Lines ◽  
Fault Current ◽  
Mutual Impedance ◽  
The Earth ◽  
Safety Compliance ◽  
Unsafe Condition ◽  
Fault Current Distribution ◽  
Simplified Formula ◽  
Earth Potential

Abstract New high-voltage (HV) substations are fed by transmission lines. The position of these lines necessitates earthing design to ensure safety compliance of the system. Conductive structures such as steel or concrete poles are widely used in HV transmission mains. The earth potential rise (EPR) generated by a fault at the substation could result in an unsafe condition. This article discusses EPR based on substation fault. The pole EPR assessment under substation fault is assessed with and without mutual impedance consideration. Split factor determination with and without the mutual impedance of the line is also discussed. Furthermore, a simplified formula to compute the pole grid current under substation fault is included. Also, it includes the introduction of the n factor which determines the number of poles that required earthing assessments under substation fault. A case study is shown.

The Generalized Response of Servovalve-Controlled, Single-Rod, Linear Actuators and the Influence of Transmission Line Dynamics

1984 ◽  
Vol 106 (2) ◽  
pp. 157-162 ◽  
Author(s):  
J. Watton
Keyword(s):  
Transmission Line ◽  
Frequency Response ◽  
System Design ◽  
Dynamic Behavior ◽  
Transmission Lines ◽  
Fatigue Testing ◽  
Open Loop ◽  
Linear Actuators ◽  
Probable Type

The open-loop response of servovalve-controlled single-rod linear actuators in investigated for both the extending and retracting cases. A linearized frequency response technique is used to establish the probable type of dynamic behavior. Nondimensional results are presented as an aid to system design, and a boundary is established such that a simplified approximation may be used. A particular class of system is then examined where interconnecting transmission lines would be important, and the techniques previously used are modified accordingly. The techniques are verified with a precision actuator developed for fatigue testing of vehicle and airframe systems.

scholarly journals Effects of Electromagnetic Fields (EMF)Near High Voltage Transmission Line: a Case Study

2015 ◽  
Vol 7 (1) ◽  
pp. 66-68
Author(s):  
M Quamruzzaman ◽  
Munima Haque ◽  
Farruk Ahmed ◽  
Md Shabab Zaman
Keyword(s):  
Transmission Line ◽  
Electromagnetic Fields ◽  
High Voltage ◽  
Medical Physics ◽  
High Voltage Transmission Line ◽  
High Voltage Transmission

Abstract not availableBangladesh Journal of Medical Physics Vol.7 No.1 2014 66-68

scholarly journals Hidden High Voltage Safety Risks for Parallel High Voltage Transmission Lines

2018 ◽  
Vol 171 ◽  
pp. 02005
Author(s):  
M. Nassereddine ◽  
J. Rizk ◽  
M. Nagrial ◽  
A. Hellany ◽  
N. Moubayed ◽  
...  
Keyword(s):  
High Voltage ◽  
Transmission Lines ◽  
Electrical Power ◽  
Paper Analysis ◽  
Induced Voltage ◽  
Parallel Transmission ◽  
Safety Risks ◽  
Unsafe Condition ◽  
Risk Potential

High voltage (HV) infrastructures market is growing due to the corresponding growth in industries and population. To ensure continuous and reliable electrical power supply, existing substation and transmission lines are being upgraded to accommodate the additional load requirements. These upgrades involve up-rating the existing transmission lines or the installation of new lines. To save on easement cost and reduce the environmental impacts, transmission lines are occupied the same easement or path. This parallel option introduces the risk of induced voltage which could reach an unsafe condition and jeopardize the safety of works and people. This paper analysis and highlight the hidden risk associated with two parallel transmission lines that connected the same high voltage substation. The theoretical study which is supported by the case study shows the high risk potential tempering with the OHEW on the isolated circuit while the other one is still energized

scholarly journals Integrating Greenhouse Gas Emissions Costs in Lifecycle Loss Evaluations: A Case Study for Transmission Lines

2013 ◽  
Vol 2013 ◽  
pp. 1-6
Author(s):  
Antonis L. Lazari ◽  
Charalambos A. Charalambous
Keyword(s):  
Power Systems ◽  
Transmission Line ◽  
Transmission Lines ◽  
Evaluation Method ◽  
Energy Savings ◽  
Electrical Energy ◽  
Low Loss ◽  
Enhanced Transmission ◽  
Investment Volume

Considering the investment volume in the electrical energy infrastructure and the increasing awareness for global warming and climate change, this paper aims to deliver an enhanced transmission line losses evaluation method that integrates true environment financial figures. The enormous volume of transmission lines utilized in power systems across the world provides a considerable potential for energy savings by adopting the idea of “energy-efficient transmission lines.” In this paper the total owning cost (TOC) formula with built-in environmental components is used to assess the relative economic benefit of a high-first-cost, low-loss transmission line unit versus one with a lower first cost and higher losses. The proposed methodology is applied on the Cyprus Power System, by incorporating true financial data and system characteristics.

Lightning Overvoltage Analysis and Calculation of 330kV Overhead Transmission Line

2014 ◽  
Vol 556-562 ◽  
pp. 1588-1591
Author(s):  
Xiu Bin Zhang ◽  
Ding Jun Wen ◽  
Ya Ming Sun ◽  
Hong Gang Chen
Keyword(s):  
Transmission Line ◽  
Equivalent Circuit ◽  
High Voltage ◽  
Transmission Lines ◽  
Equivalent Circuit Model ◽  
Voltage Level ◽  
High Voltage Transmission Line ◽  
Overhead Transmission Line ◽  
Overhead Transmission Lines ◽  
Pollution Flashover

Lighting is one of the important reasons of transmission line trip accident. For 330kV and above ultra high voltage transmission line, lighting flashover more frequently occur. To reduce tripping rate effectively and fundamentally, lightning over voltage level should be analyzed besides anti-pollution flashover. In this paper, a simplified equivalent circuit model of a 330kV overhead transmission lines is established. The lightning over voltage of the transmission is analyzed and calculated. Method to reduce the lightning overvoltage is discussed.

scholarly journals Analisis Perbandingan Efisiensi Penyaluran Listrik Antara Penghantar ACSR dan ACCC pada Sistem Transmisi 150kV

2019 ◽  
Vol 11 (1) ◽  
pp. 37-45
Author(s):  
Oktaria Handayani ◽  
Tasdik Darmana ◽  
Christine Widyastuti
Keyword(s):  
Power Plant ◽  
High Voltage ◽  
Transmission Lines ◽  
Power Losses ◽  
Long Distance ◽  
Calculation Results ◽  
Rate Of Recovery ◽  
Extra High Voltage ◽  
Load Center

Electricity need in Indonesia continues to increase in accordance with the rate of recovery of the economy and industry and the increase in population. The transmission line transmits electricity from the power plant to the load center via the High Voltage transmission lines (SUTT) or Extra High Voltage Transmissio lines (SUTET), because the long distance causes power losses. The condition before the reconducting of Tebing Tinggi - Kuala Tanjung transmission uses ACSR conductor types and after the reconducting has been replaced by the ACCC, where ACCC has 2 times the current trying of the type of ACSR. In this study, we will examine and analyze the magnitude of the power losses and the efficiency of the distribution of the two types of ACSR and ACCC supply channels with a case study of the 150 kV transmission system Tebing Tinggi - Kuala Tanjung which has a distance of 71.5 km. From the calculation results obtained, after the reconducting process using the conductor the ACCC was able to reduce power losses and increase efficiency by 1.35%.    

scholarly journals Optimized Design of Modular Multilevel DC De-Icer for High Voltage Transmission Lines

2018 ◽  
Author(s):  
Jiazheng Lu ◽  
Qingjun Huang ◽  
Xinguo Mao ◽  
Yanjun Tan ◽  
Siguo Zhu ◽  
...  
Keyword(s):  
High Voltage ◽  
Transmission Lines ◽  
Engineering Application ◽  
Optimized Design ◽  
Power Outage ◽  
Technical Performance ◽  
Promising Solution ◽  
High Voltage Transmission

Ice covering on overhead transmission lines would cause damage to transmission system and long-term power outage. Among various de-icing devices, modular multilevel converter (MMC) based DC de-icer (MMC-DDI) is recognized as a promising solution due to its excellent technical performance. Its principle feasibility has been well studied, but few literature discuss its economy or hardware optimization, thus the designed MMC-DDI for high voltage transmission lines is usually too large and too expensive for engineering applications. To fill this gap, this paper presents a quantitative analysis on the converter characteristics of MMC-DDI, and calculates the minimal converter rating and its influencing factors. It reals that, for a given de-icing requirement, the converter rating varies greatly with its AC-side voltage. Then an optimization configuration is proposed to reduce the converter rating and improve its economy. The proposed configuration is verified in a MMC-DDI for a 500kV transmission line as a case study. The result shows, in the case of outputting same de-icing characteristics, the optimized converter rating is reduced from 151 MVA to 68 MVA, and total cost of MMC-DDI is reduced by 48%. This analysis and conclusion are conductive to the optimized design of multilevel DC de-icer, then to its engineering application.

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