This case study examines the lightning protection design for the expansion of a substation in an area with a low ground flash density of 0.04 flashes/km2/year. The original design used the rolling sphere method but outages for full implementation may not be available. A risk evaluation found that using the fixed angle method with angles of 45 degrees provided adequate protection, with failure rates several orders of magnitude below tolerable risk levels even without complete coverage. Two fixed angle options were considered, and option 2 without an additional lightning mast was recommended due to construction risks and low incidence of strikes.
lightning stroke. Substation equipment and auxiliaries also can be get damaged by the lightning
strokes. This paper shows some methods to reduce the effect of lightning stroke on the substation. There
are conventional and non-conventional methods for this. This paper describes some of that methods
briefly.
The document discusses lightning protection standards and procedures for buildings. It compares the Indian standard IS 2309 to the international standard BS EN/IEC 62305, which considers risks to human life not addressed in IS 2309. The procedure involves calculating lightning risks, selecting a protection level class, and employing measures like the rolling sphere, protective angle, or mesh methods to determine placement of air terminals and down conductors. A case study examines risks for the Joka station building and proposes design changes like repositioning air terminals to improve protection according to the rolling sphere method.
Chapter 8 overvoltage phenomenon and insulation coordination.pptborapring
The document discusses lightning phenomena, stroke formation, lightning parameters, empirical design methods, the electrogeometric model (EGM), and insulation coordination. Some key points:
- Lightning forms due to the separation of charges within ice crystals in thunderclouds.
- A lightning stroke occurs through a stepped leader and return stroke process.
- Parameters like strike distance and current magnitude help determine protection needs.
- Traditional methods use fixed angles or empirical curves to determine shielding requirements.
- The EGM model calculates allowable stroke currents and striking distances using insulation levels.
- Insulation coordination aims to select insulation levels and surge arresters to withstand overvoltages.
This document discusses lightning phenomena and protection. It begins by explaining how lightning forms within cumulonimbus clouds due to the ice splinter theory. It then describes the processes of stepped leaders and return strokes that make up lightning. Key lightning parameters like strike distance, stroke current, keraunic level, and ground flash density are also defined. Traditional empirical design methods like fixed angles and Wagner curves are explained for determining shielding requirements. Finally, the more modern electrogeometric model is introduced for calculating allowable stroke currents and striking distances.
Development Design of Lightning Protection System in Rig PDSI #38.2/D1000-ESyamsirAbduh2
Rig PDSI #38.2/D1000-E is a national vital object owned by one of several oil and gas companies in Indonesia, a company engaged in the oil and gas sector. The rig is a building used for drilling activities to extract natural resources from the earth. Due to the tall structure of the rig building and its location in an open area, it is susceptible to lightning strikes. The development of a lightning strike protection system for this rig is necessary due to disruptions experienced in 2020, which affected electrical installations, control networks, telecommunications, and instrumentation at the rig, all caused by lightning strikes. This study will utilize several standards, including PUIPP (General Guidelines for Lightning Protection Installations), Permen No. 31 of 2015, NF C 17-102 2011, and IEC-62305. The rolling sphere method and radius of protection will be employed as methods of lightning strike protection. Rig PDSI #38.2/D1000-E experiences a direct lightning strike frequency value (Nd) of 3,029 lightning strikes per year, with a building lightning strike equivalent area (Ae) of 103,922.57 m2. The value of the intensity of lightning strikes to the ground (Ng) is measured at 29.15 lightning strikes per km2 per year, corresponding to a level I protection level. The recommended protection radius is 20 meters, and the average grounding resistance value is 0.1925 Ω. Additionally, this study introduces an internal lightning protection system using a surge protection device (SPD). Keywords—Lightning Protection, Rig, Electrostatic, ESEAT,
Development Design of Lightning Protection System in Rig PDSI #38.2/D1000-ESyamsirAbduh2
Rig PDSI #38.2/D1000-E is a national vital object owned by one of several oil and gas companies in Indonesia, a company engaged in the oil and gas sector. The rig is a building used for drilling activities to extract natural resources from the earth. Due to the tall structure of the rig building and its location in an open area, it is susceptible to lightning strikes. The development of a lightning strike protection system for this rig is necessary due to disruptions experienced in 2020, which affected electrical installations, control networks, telecommunications, and instrumentation at the rig, all caused by lightning strikes. This study will utilize several standards, including PUIPP (General Guidelines for Lightning Protection Installations), Permen No. 31 of 2015, NF C 17-102 2011, and IEC-62305. The rolling sphere method and radius of protection will be employed as methods of lightning strike protection. Rig PDSI #38.2/D1000-E experiences a direct lightning strike frequency value (Nd) of 3,029 lightning strikes per year, with a building lightning strike equivalent area (Ae) of 103,922.57 m2. The value of the intensity of lightning strikes to the ground (Ng) is measured at 29.15 lightning strikes per km2 per year, corresponding to a level I protection level. The recommended protection radius is 20 meters, and the average grounding resistance value is 0.1925 Ω. Additionally, this study introduces an internal lightning protection system using a surge protection device
The document discusses principles of radiation shielding, including different types of radiation and common shielding materials. It describes three basic principles for controlling external radiation: time, distance, and shielding. Shielding methods include using thickness of lead, concrete, steel or other materials to reduce radiation intensity based on half-value layer and tenth-value layer measurements.
lightning stroke. Substation equipment and auxiliaries also can be get damaged by the lightning
strokes. This paper shows some methods to reduce the effect of lightning stroke on the substation. There
are conventional and non-conventional methods for this. This paper describes some of that methods
briefly.
The document discusses lightning protection standards and procedures for buildings. It compares the Indian standard IS 2309 to the international standard BS EN/IEC 62305, which considers risks to human life not addressed in IS 2309. The procedure involves calculating lightning risks, selecting a protection level class, and employing measures like the rolling sphere, protective angle, or mesh methods to determine placement of air terminals and down conductors. A case study examines risks for the Joka station building and proposes design changes like repositioning air terminals to improve protection according to the rolling sphere method.
Chapter 8 overvoltage phenomenon and insulation coordination.pptborapring
The document discusses lightning phenomena, stroke formation, lightning parameters, empirical design methods, the electrogeometric model (EGM), and insulation coordination. Some key points:
- Lightning forms due to the separation of charges within ice crystals in thunderclouds.
- A lightning stroke occurs through a stepped leader and return stroke process.
- Parameters like strike distance and current magnitude help determine protection needs.
- Traditional methods use fixed angles or empirical curves to determine shielding requirements.
- The EGM model calculates allowable stroke currents and striking distances using insulation levels.
- Insulation coordination aims to select insulation levels and surge arresters to withstand overvoltages.
This document discusses lightning phenomena and protection. It begins by explaining how lightning forms within cumulonimbus clouds due to the ice splinter theory. It then describes the processes of stepped leaders and return strokes that make up lightning. Key lightning parameters like strike distance, stroke current, keraunic level, and ground flash density are also defined. Traditional empirical design methods like fixed angles and Wagner curves are explained for determining shielding requirements. Finally, the more modern electrogeometric model is introduced for calculating allowable stroke currents and striking distances.
Development Design of Lightning Protection System in Rig PDSI #38.2/D1000-ESyamsirAbduh2
Rig PDSI #38.2/D1000-E is a national vital object owned by one of several oil and gas companies in Indonesia, a company engaged in the oil and gas sector. The rig is a building used for drilling activities to extract natural resources from the earth. Due to the tall structure of the rig building and its location in an open area, it is susceptible to lightning strikes. The development of a lightning strike protection system for this rig is necessary due to disruptions experienced in 2020, which affected electrical installations, control networks, telecommunications, and instrumentation at the rig, all caused by lightning strikes. This study will utilize several standards, including PUIPP (General Guidelines for Lightning Protection Installations), Permen No. 31 of 2015, NF C 17-102 2011, and IEC-62305. The rolling sphere method and radius of protection will be employed as methods of lightning strike protection. Rig PDSI #38.2/D1000-E experiences a direct lightning strike frequency value (Nd) of 3,029 lightning strikes per year, with a building lightning strike equivalent area (Ae) of 103,922.57 m2. The value of the intensity of lightning strikes to the ground (Ng) is measured at 29.15 lightning strikes per km2 per year, corresponding to a level I protection level. The recommended protection radius is 20 meters, and the average grounding resistance value is 0.1925 Ω. Additionally, this study introduces an internal lightning protection system using a surge protection device (SPD). Keywords—Lightning Protection, Rig, Electrostatic, ESEAT,
Development Design of Lightning Protection System in Rig PDSI #38.2/D1000-ESyamsirAbduh2
Rig PDSI #38.2/D1000-E is a national vital object owned by one of several oil and gas companies in Indonesia, a company engaged in the oil and gas sector. The rig is a building used for drilling activities to extract natural resources from the earth. Due to the tall structure of the rig building and its location in an open area, it is susceptible to lightning strikes. The development of a lightning strike protection system for this rig is necessary due to disruptions experienced in 2020, which affected electrical installations, control networks, telecommunications, and instrumentation at the rig, all caused by lightning strikes. This study will utilize several standards, including PUIPP (General Guidelines for Lightning Protection Installations), Permen No. 31 of 2015, NF C 17-102 2011, and IEC-62305. The rolling sphere method and radius of protection will be employed as methods of lightning strike protection. Rig PDSI #38.2/D1000-E experiences a direct lightning strike frequency value (Nd) of 3,029 lightning strikes per year, with a building lightning strike equivalent area (Ae) of 103,922.57 m2. The value of the intensity of lightning strikes to the ground (Ng) is measured at 29.15 lightning strikes per km2 per year, corresponding to a level I protection level. The recommended protection radius is 20 meters, and the average grounding resistance value is 0.1925 Ω. Additionally, this study introduces an internal lightning protection system using a surge protection device
The document discusses principles of radiation shielding, including different types of radiation and common shielding materials. It describes three basic principles for controlling external radiation: time, distance, and shielding. Shielding methods include using thickness of lead, concrete, steel or other materials to reduce radiation intensity based on half-value layer and tenth-value layer measurements.
1. The document discusses principles of radiation shielding, including the use of time, distance, and shielding materials to reduce radiation exposure. It provides examples showing how to calculate exposure levels based on these principles.
2. Shielding materials like lead, steel, concrete, and tungsten are discussed. Metrics like half-value layer and tenth-value layer are introduced to characterize the shielding ability of different materials against different radiation types.
3. The concept of buildup factor is explained, which accounts for increased radiation levels due to scattering in shielding materials. Proper ordering of shielding layers can help minimize radiation buildup.
A Review and study of the design technique of Microstrip Patch Antenna Techno...IJERA Editor
In this paper,study and survey of microstrip antenna elements is presented, with emphasis on theoretical and
practical design techniques and material used, as previous study have been proved that material used play
significant role in the performance such as gain ,directivity ,frequency of radiation Available substrate materials
are reviewed along with the relation between dielectric constant tolerance and resonant frequency of microstrip
patches. Several theoretical analysis techniques are summarized. Practical procedures are given for both
standard rectangular and circular patches. The quality, bandwidth, and efficiency factors of typical patch designs
are discussed.
HV electrical networks can be earthed in different ways, each with advantages and disadvantages. This document analyzes the constraints imposed by overvoltages, network characteristics, and equipment requirements to determine the suitable earthing method. Different earthing options are described such as direct earthing, earthing through a reactor, and earthing through a resistor. Fault currents are calculated using a simplified method to determine protection settings and ensure selectivity.
ANALISIS PERANCANGAN SISTEM PROTEKSI BANGUNAN THE BELLAGIO RESIDENCE TERHADAP...SyamsirAbduh2
High rise building is one of the objects that have the possibility of being struck by lightning considering geographical location of Indonesia which in equator, resulted in rainfall and intensity of lightning strikes is quite high. Hence it is important to protect high rise buildings with a reliable system such as Electric Field Lightning Protection System (E.F Lightning Protection System). This system is more active due to the addition of the charge induced lightning rod from the earth's surface. This protection system has 150,597.54 m2 wide protection area by E.F terminals. The 35mm2 conductor dealer (E.F Carrier) carry high voltage with additional dealer conductor. The distance between lighting rods is 38.73 meters. The first resistance grounding is 1.72Ω and the second resistance is 2.32Ω. The result shows thet the system already meets standards for ng buildings protection.
1) Orbital provides lightning protection systems using several technologies including early streamer emission air terminals which trigger upward lightning leaders more quickly than conventional terminals.
2) Orbital has invested heavily in testing its products, especially the ESE terminals, to ensure they meet standards like the French NF C 17-102.
3) Orbital's 5 point protection plan aims to capture direct strikes, dissipate energy into the grounding system, create a bonded earthing system, and protect power and communication lines.
This document provides an overview of microstrip patch antennas. It discusses their structure, which consists of a radiating patch on top of a dielectric substrate with a ground plane on the bottom. Common shapes for the patch include square, rectangular, circular, and triangular. Key parameters that affect performance are described. Advantages include low profile, light weight, and easy integration with circuits. Disadvantages include narrow bandwidth and low gain. Applications discussed include mobile devices, satellites, GPS, and medical therapy. Different types of microstrip antennas are also categorized, including patch antennas, slot antennas, dipoles, and traveling wave antennas.
The outgrowth of transportable wireless communication devices has pushed designers to design miniature size antennas. The most prized among miniature antenna selections is that the microstrip patch antenna. In this paper, A wideband M-shaped microstrip patch antenna has been designed for wireless communications such as Radar, Satellite and Microwave communications etc. A substrate of low dielectric constant named Rogers RT5880 is selected to obtain a compact radiating structure that meets the demanding bandwidth specification. The designed antenna has a dimension of 28.9mm by 24.20mm. The reflection coefficient at the input of the optimized M-shaped microstrip patch antenna is below −10 dB. The measurement results are in excellent agreement with the Sonnet Suite simulation results to analyze the performance. Simulation results show that the impedance bandwidth is 48.78% of the center frequency. This Method of Moment based simulation software provides the results in terms of S11 parameter, Return Loss, VSWR, etc. which is quite useful to analyze the antenna performance. The proposed microstrip patch antenna is suitable for C-band communication. The Bandwidth obtained for C-band communications is greater than other existing M-shape microstrip patch antennas.
IDENTIFICATION OF TOWER AND BOOM-WAKES USING COLLOCATED ANEMOMETERS AND LIDAR...IAEME Publication
In this study the extent of tower and boom wake distortions were evaluated using collocated anemometers and Lidar measurement based on wind data from Amperbo, Namibia, where an existing latticed equilateral triangular communication tower was instrumented according to IEC specifications. Wind data analysed was 10-minute averaged, captured over a period of nine months (May to Sept. 2014). To enable further and independent investigation of flow modification within the vicinity of the tower, ZephIR 300 wind Lidar was installed at about 5.4 m from the foot of the tower. Wind data from pairs of collocated cup anemometers located at 16.88 m and 64.97 m above ground level (AGL) were analysed and compared to identify the range of directions that were affected by the waking of the entire tower physical structure. Mean speed and turbulence intensity (TI) were used in quantify the wake impact on the wind data observed using cup anemometers, showing a speed deficit of up to 49 % and order of magnitude increase in the TI for all the regions within the wake of the tower. Comparison with ZephIR 300 observed mean speed resulted in a speed deficit of up to 50 % which further confirmed the extent of tower distortion and wake boundaries. The Lidar also confirmed the speed-up effects and the asymmetric nature of the wake boundaries associated with the mounting booms. The results show that TI analysis has the potential to more accurately define the wake boundaries and wake distortion than traditional speed ratios analysis. The study shows that the severity of tower wake effects varies seasonally with winter months (June and July) recording the highest speed deficit when compared to December, a summer month. Root Mean Square Errors (RMSE) were further computed to ascertain the similarity degree of resource parameters from the two measurement techniques, resulting in peak values of RMSE in the wake affected regions. The TI approach consistently predicted larger wake boundaries than speed ratio analysis. Wind direction analysis clearly showed the 180° ambiguity of ZephIR 300 and the extent of deflection of the winds around the tower structure. Preliminary evaluation of wake impact on the resource parameter shows that removing the sectors affected by tower wakes leads to an increase in mean wind speed and a decrease in TI values.
Project Smart City ,Project AMRUT, Project Solar PV Power ,Muncipal Corporation , ProjectStreet Light LED,Project Traffic Light, Project out door CCTV,Project Variable Moving Display,all Architect,MEP,Electrical Consultants ,Project Engineering Department Electrical, Project Telecom and Broadband
Impact and analytical study of the patch and slot for antenna designeSAT Journals
Abstract Antenna is the backbone of the communication system. With the advent of technology a lot of innovation happens to develop the antennas. Antenna is a smart device, which not only transmit and receive but also works as a transducer. S/N ratio also Abstract depend upon the efficiency of the antenna .Patch and slot has become a very important in modern wireless communication antennas. Patch and slots are being used for performance improvement of antenna in wireless communication. with the pace and speed of the communication theory, antennas also its design also developed in an innovative ways. Keeping the above fact in mind we had tried to present a complete review on patch and slots antennas .it has been analyzed in detail, In different size and shapes of slots and patch are great interest of obtaining optimum results of antenna design , in order to allow their use in communication application. A variety of the antennas are available in the communication engineering system. Present study represent the various details and open wide the slit for more innovations. Keywords- ( patch, slot GSM900, GSM1800, GSM 2100, UMTS, IMT-2000 and PCS,
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
The document summarizes major changes in the 2015 edition of NFPA 70E: Standard for Electrical Safety in the Workplace. Key changes include replacing terms like "harm" and "probablility" with more accurate terms, expanding definitions of terms like "qualified person" and "risk assessment", strengthening electrical safety program requirements, expanding training requirements, and modifying shock and arc flash risk assessment procedures and PPE categories. Changes aim to improve safety for electrical work by providing clearer guidance and better alignment with other safety standards.
IRJET- Microstrip Patch Antenna Design for Military ApplicationsIRJET Journal
The document describes the design of an E-shaped microstrip patch antenna for military applications operating at 2.54GHz (S-band). It discusses the design process, including calculating the antenna dimensions based on design equations. A prototype antenna was modeled in CST simulation software using FR-4 substrate. Simulation results showed the E-shaped patch antenna achieved improved gain and bandwidth compared to a conventional square patch antenna. Potential applications of the antenna include wireless communications and the antenna design could be further optimized for frequency agility.
IRJET- Circularly Polarized Ultra Wide Band Ring Shaped DGS Microstrip An...IRJET Journal
This document presents the design and simulation of a circularly polarized ultra-wideband ring shaped defected ground structure microstrip antenna for wireless applications. The proposed antenna was designed on an FR4 substrate using HFSS simulation software. Simulation results showed the antenna achieved over 31% bandwidth with good axial ratio and gain characteristics. The antenna was then fabricated and measured, showing 22.85% bandwidth. The simulated and measured results were found to be in good agreement overall. The antenna is suitable for applications such as mobile satellite services, Bluetooth, and wireless networking due to its wide bandwidth and circular polarization.
Designing a microstrip patch antenna - operating at 1.518Ghz.IRJET Journal
This document describes the design and simulation of a microstrip patch antenna operating at 1.518GHz. It discusses the key steps in designing the antenna, including calculating the length and width of the patch based on the operating frequency and dielectric substrate properties. The antenna design is then simulated using CST Microwave Studio software. The simulation results show a gain of 3.367dB, VSWR of 1.012, S11 parameter magnitude of -43.886dB indicating good impedance matching, and radiation patterns as expected for this type of antenna. The antenna is concluded to be successfully designed to operate at the target frequency of 1.518GHz.
This document summarizes a case study where a pulp and paper mill converted over 100 solidly grounded substations to high resistance grounded systems to reduce arc flash incidents. This increased safety and reliability while decreasing arc flash energy levels. While high resistance grounding initially increased incident energy at some substations, combining it with other mitigation techniques like tighter relay coordination, electronic protection relays, and faster fuses helped further reduce incident energy. The mill also observed decreased motor failures and repair costs after implementing high resistance grounding.
The electrical arc creates a pressure wave. The incident energy is the energy of this arc-flash coming into contact with a surface. Essentially an electric arc creates a radiation burn which accounts for the internal burns a person can receive when exposed to an electrical arc flash.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology.
An arc flash is a dangerous event that occurs due to an arcing fault in an electrical system, which can release tremendous heat energy and cause severe burns, injuries or death. Proper personal protective equipment is required depending on the calculated incident energy level at different locations. Regular maintenance, worker training and safety programs are important to reduce arc flash hazards by preventing faults and minimizing exposure times.
Multiband Circular Microstrip Patch Antenna for WLAN Applicationtheijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
1. The document discusses principles of radiation shielding, including the use of time, distance, and shielding materials to reduce radiation exposure. It provides examples showing how to calculate exposure levels based on these principles.
2. Shielding materials like lead, steel, concrete, and tungsten are discussed. Metrics like half-value layer and tenth-value layer are introduced to characterize the shielding ability of different materials against different radiation types.
3. The concept of buildup factor is explained, which accounts for increased radiation levels due to scattering in shielding materials. Proper ordering of shielding layers can help minimize radiation buildup.
A Review and study of the design technique of Microstrip Patch Antenna Techno...IJERA Editor
In this paper,study and survey of microstrip antenna elements is presented, with emphasis on theoretical and
practical design techniques and material used, as previous study have been proved that material used play
significant role in the performance such as gain ,directivity ,frequency of radiation Available substrate materials
are reviewed along with the relation between dielectric constant tolerance and resonant frequency of microstrip
patches. Several theoretical analysis techniques are summarized. Practical procedures are given for both
standard rectangular and circular patches. The quality, bandwidth, and efficiency factors of typical patch designs
are discussed.
HV electrical networks can be earthed in different ways, each with advantages and disadvantages. This document analyzes the constraints imposed by overvoltages, network characteristics, and equipment requirements to determine the suitable earthing method. Different earthing options are described such as direct earthing, earthing through a reactor, and earthing through a resistor. Fault currents are calculated using a simplified method to determine protection settings and ensure selectivity.
ANALISIS PERANCANGAN SISTEM PROTEKSI BANGUNAN THE BELLAGIO RESIDENCE TERHADAP...SyamsirAbduh2
High rise building is one of the objects that have the possibility of being struck by lightning considering geographical location of Indonesia which in equator, resulted in rainfall and intensity of lightning strikes is quite high. Hence it is important to protect high rise buildings with a reliable system such as Electric Field Lightning Protection System (E.F Lightning Protection System). This system is more active due to the addition of the charge induced lightning rod from the earth's surface. This protection system has 150,597.54 m2 wide protection area by E.F terminals. The 35mm2 conductor dealer (E.F Carrier) carry high voltage with additional dealer conductor. The distance between lighting rods is 38.73 meters. The first resistance grounding is 1.72Ω and the second resistance is 2.32Ω. The result shows thet the system already meets standards for ng buildings protection.
1) Orbital provides lightning protection systems using several technologies including early streamer emission air terminals which trigger upward lightning leaders more quickly than conventional terminals.
2) Orbital has invested heavily in testing its products, especially the ESE terminals, to ensure they meet standards like the French NF C 17-102.
3) Orbital's 5 point protection plan aims to capture direct strikes, dissipate energy into the grounding system, create a bonded earthing system, and protect power and communication lines.
This document provides an overview of microstrip patch antennas. It discusses their structure, which consists of a radiating patch on top of a dielectric substrate with a ground plane on the bottom. Common shapes for the patch include square, rectangular, circular, and triangular. Key parameters that affect performance are described. Advantages include low profile, light weight, and easy integration with circuits. Disadvantages include narrow bandwidth and low gain. Applications discussed include mobile devices, satellites, GPS, and medical therapy. Different types of microstrip antennas are also categorized, including patch antennas, slot antennas, dipoles, and traveling wave antennas.
The outgrowth of transportable wireless communication devices has pushed designers to design miniature size antennas. The most prized among miniature antenna selections is that the microstrip patch antenna. In this paper, A wideband M-shaped microstrip patch antenna has been designed for wireless communications such as Radar, Satellite and Microwave communications etc. A substrate of low dielectric constant named Rogers RT5880 is selected to obtain a compact radiating structure that meets the demanding bandwidth specification. The designed antenna has a dimension of 28.9mm by 24.20mm. The reflection coefficient at the input of the optimized M-shaped microstrip patch antenna is below −10 dB. The measurement results are in excellent agreement with the Sonnet Suite simulation results to analyze the performance. Simulation results show that the impedance bandwidth is 48.78% of the center frequency. This Method of Moment based simulation software provides the results in terms of S11 parameter, Return Loss, VSWR, etc. which is quite useful to analyze the antenna performance. The proposed microstrip patch antenna is suitable for C-band communication. The Bandwidth obtained for C-band communications is greater than other existing M-shape microstrip patch antennas.
IDENTIFICATION OF TOWER AND BOOM-WAKES USING COLLOCATED ANEMOMETERS AND LIDAR...IAEME Publication
In this study the extent of tower and boom wake distortions were evaluated using collocated anemometers and Lidar measurement based on wind data from Amperbo, Namibia, where an existing latticed equilateral triangular communication tower was instrumented according to IEC specifications. Wind data analysed was 10-minute averaged, captured over a period of nine months (May to Sept. 2014). To enable further and independent investigation of flow modification within the vicinity of the tower, ZephIR 300 wind Lidar was installed at about 5.4 m from the foot of the tower. Wind data from pairs of collocated cup anemometers located at 16.88 m and 64.97 m above ground level (AGL) were analysed and compared to identify the range of directions that were affected by the waking of the entire tower physical structure. Mean speed and turbulence intensity (TI) were used in quantify the wake impact on the wind data observed using cup anemometers, showing a speed deficit of up to 49 % and order of magnitude increase in the TI for all the regions within the wake of the tower. Comparison with ZephIR 300 observed mean speed resulted in a speed deficit of up to 50 % which further confirmed the extent of tower distortion and wake boundaries. The Lidar also confirmed the speed-up effects and the asymmetric nature of the wake boundaries associated with the mounting booms. The results show that TI analysis has the potential to more accurately define the wake boundaries and wake distortion than traditional speed ratios analysis. The study shows that the severity of tower wake effects varies seasonally with winter months (June and July) recording the highest speed deficit when compared to December, a summer month. Root Mean Square Errors (RMSE) were further computed to ascertain the similarity degree of resource parameters from the two measurement techniques, resulting in peak values of RMSE in the wake affected regions. The TI approach consistently predicted larger wake boundaries than speed ratio analysis. Wind direction analysis clearly showed the 180° ambiguity of ZephIR 300 and the extent of deflection of the winds around the tower structure. Preliminary evaluation of wake impact on the resource parameter shows that removing the sectors affected by tower wakes leads to an increase in mean wind speed and a decrease in TI values.
Project Smart City ,Project AMRUT, Project Solar PV Power ,Muncipal Corporation , ProjectStreet Light LED,Project Traffic Light, Project out door CCTV,Project Variable Moving Display,all Architect,MEP,Electrical Consultants ,Project Engineering Department Electrical, Project Telecom and Broadband
Impact and analytical study of the patch and slot for antenna designeSAT Journals
Abstract Antenna is the backbone of the communication system. With the advent of technology a lot of innovation happens to develop the antennas. Antenna is a smart device, which not only transmit and receive but also works as a transducer. S/N ratio also Abstract depend upon the efficiency of the antenna .Patch and slot has become a very important in modern wireless communication antennas. Patch and slots are being used for performance improvement of antenna in wireless communication. with the pace and speed of the communication theory, antennas also its design also developed in an innovative ways. Keeping the above fact in mind we had tried to present a complete review on patch and slots antennas .it has been analyzed in detail, In different size and shapes of slots and patch are great interest of obtaining optimum results of antenna design , in order to allow their use in communication application. A variety of the antennas are available in the communication engineering system. Present study represent the various details and open wide the slit for more innovations. Keywords- ( patch, slot GSM900, GSM1800, GSM 2100, UMTS, IMT-2000 and PCS,
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
The document summarizes major changes in the 2015 edition of NFPA 70E: Standard for Electrical Safety in the Workplace. Key changes include replacing terms like "harm" and "probablility" with more accurate terms, expanding definitions of terms like "qualified person" and "risk assessment", strengthening electrical safety program requirements, expanding training requirements, and modifying shock and arc flash risk assessment procedures and PPE categories. Changes aim to improve safety for electrical work by providing clearer guidance and better alignment with other safety standards.
IRJET- Microstrip Patch Antenna Design for Military ApplicationsIRJET Journal
The document describes the design of an E-shaped microstrip patch antenna for military applications operating at 2.54GHz (S-band). It discusses the design process, including calculating the antenna dimensions based on design equations. A prototype antenna was modeled in CST simulation software using FR-4 substrate. Simulation results showed the E-shaped patch antenna achieved improved gain and bandwidth compared to a conventional square patch antenna. Potential applications of the antenna include wireless communications and the antenna design could be further optimized for frequency agility.
IRJET- Circularly Polarized Ultra Wide Band Ring Shaped DGS Microstrip An...IRJET Journal
This document presents the design and simulation of a circularly polarized ultra-wideband ring shaped defected ground structure microstrip antenna for wireless applications. The proposed antenna was designed on an FR4 substrate using HFSS simulation software. Simulation results showed the antenna achieved over 31% bandwidth with good axial ratio and gain characteristics. The antenna was then fabricated and measured, showing 22.85% bandwidth. The simulated and measured results were found to be in good agreement overall. The antenna is suitable for applications such as mobile satellite services, Bluetooth, and wireless networking due to its wide bandwidth and circular polarization.
Designing a microstrip patch antenna - operating at 1.518Ghz.IRJET Journal
This document describes the design and simulation of a microstrip patch antenna operating at 1.518GHz. It discusses the key steps in designing the antenna, including calculating the length and width of the patch based on the operating frequency and dielectric substrate properties. The antenna design is then simulated using CST Microwave Studio software. The simulation results show a gain of 3.367dB, VSWR of 1.012, S11 parameter magnitude of -43.886dB indicating good impedance matching, and radiation patterns as expected for this type of antenna. The antenna is concluded to be successfully designed to operate at the target frequency of 1.518GHz.
This document summarizes a case study where a pulp and paper mill converted over 100 solidly grounded substations to high resistance grounded systems to reduce arc flash incidents. This increased safety and reliability while decreasing arc flash energy levels. While high resistance grounding initially increased incident energy at some substations, combining it with other mitigation techniques like tighter relay coordination, electronic protection relays, and faster fuses helped further reduce incident energy. The mill also observed decreased motor failures and repair costs after implementing high resistance grounding.
The electrical arc creates a pressure wave. The incident energy is the energy of this arc-flash coming into contact with a surface. Essentially an electric arc creates a radiation burn which accounts for the internal burns a person can receive when exposed to an electrical arc flash.
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1. A Case Study for Substation Lightning Strike Risk Evaluation
Stephen Chuang
111 Dunsmuir Street #400, Vancouver, BC V6B 5W3
604-6644123
Stephen.chuang@amecfw.com
Abstract
Shielding of substations from direct lightning strokes is a common practice used to protect equipment
from damage and reduce the number of system outages caused by lightning. However, when a substation
is being upgraded, installation of lightning masts and shielding wires across the substation for full
coverage may not be realistic as the necessary outages may not be available.
This paper is a case study for the lightning shielding design of a substation transformer addition and
feeder section expansion project. By analyzing the lightning exposure level of the area and risk evaluation
of direct lightning strokes to a substation, it is possible to design from a practical perspective of
approaching substantial but not complete shielding coverage of the station; hence reduce the outage zone
required during construction.
This case study also provides recommendations for future lightning protection design for existing
(brownfield) substation.
Index Terms – Fixed angle method, ground flash density, lightning mast, risk evaluation, rolling
sphere method, shield wire, substation.
2. 1.0 Introduction
In early 2012, Amec Foster Wheeler started a capacity addition project. The area of the substation was
expanded to accommodate a new 25 kV feeder section and a new 69 kV/25 kV power transformer where
the fixed angle method was originally used to protect the substation when it was built in 1964.
The project scope included upgrading the substation lightning projection to use the rolling sphere method,
in accordance with IEEE 998 and to conform to the owner’s latest engineering standards on lightning
protection and enhance the coverage of the expanded new substation area.
Rolling sphere is a simplified technique for applying the electrogeometric theory to the shielding of
substations. The technique involves rolling an imaginary sphere of prescribed radius over the surface of a
substation. The sphere rolls up and over (and is supported by) lightning masts, shield wires, fences, and
other grounded metal objects intended for lightning shielding. A piece of equipment is protected from a
direct stroke if it remains below the curved surface of the sphere by virtue of the sphere being elevated by
shield wires or other devices. Equipment that touches the sphere or penetrates its surface is not protected
[1].
Following the calculation method provided in IEEE 998, Annex B, the design for the rolling sphere
method would require six lightning masts with shield wire around the perimeter and crisscrossing the
switchyard. Figure 1 shows the station fully covered from lightning strikes with masts and shield wires by
using rolling sphere method.
The detailed design was progressed using the rolling sphere method. However, it was noted in the
constructability review with the client that the outage on transformer T2 might not be available at the time
of construction. To avoid the risk of delaying the project and modifying the design greatly, Amec Foster
Wheeler performed a detailed study of the possibility of switching to the fixed angle method using the
pre-determined locations of lightning masts and surrounding shield wires that were selected based on the
rolling sphere method. A risk evaluation between the rolling sphere method and the fixed angle method,
as well as the failure rate of each method, were performed and are noted in later sections.
3. Figure 1: Lightning Protection for the Substation - Rolling Sphere Method
2.0 Shielding Coverage with Fixed Angle Method
Fixed angle method is a technique that uses vertical angles to determine the number, position, and height
of shielding wires or masts. The protection angle is selected based on the acceptable level of exposure.
This fixed angle of protection forms a cone around masts or spires. The protection zone around shield
wires forms a triangular prism beneath shield wire.
For the fixed angle method, the value of the angle alpha that is commonly used is 45 degrees. Both 30
degrees and 45 degrees are widely used for angle beta [1]. Horvath [2] suggests a protective angle of 40
degrees to 45 degrees for heights up to 15 m, 30 degrees for heights between 15 and 25 m, and less than
20 degrees for heights to 50 m. With this recommendations, a failure rate of 0.1 to 0.2 shielding
failures/100 km/year was assumed.
The protective angle used for this substation is α = 45⁰, β = 45⁰. Using the lightning mast locations
determined by the rolling sphere method, the coverage area in figure 2 indicates that a large portion of the
25 kV switchyard remains exposed. Although the risk evaluation in the later sections shows that this is
acceptable for this location, adding an additional mast to improve the coverage was also considered
(figure 3).
5. Figure 3: Lightning Shield Coverage Area, α = 45⁰, β = 45⁰, with a Lightning Mast
Table 1 shows the amount of unshielded area within the substation with two different scenarios.
Options Coverage Area (m2
)
Option 1: α = 45⁰, β = 45⁰, with a lightning mast 1010
Option 2: α = 45⁰, β = 45⁰, without lightning mast 1581
Table 1: Unshielded Area with Fixed Angle Method
6. 3.0 Risk Evaluation
The risk of a direct strike to equipment associated with each lightning protection method is directly
related to the lightning activity at the location, exposure rate of the selected scheme, and total equipment
area being protected.
3.1 Lightning Activity at the Location
Lightning activity is based on historical data and quantified as the ground flash density (GFD), which is
the number of lightning strikes per square km per year. The Canadian Lightning Detection Network has
been collecting data between 1999 to 2013. The GFD at the project site is:
NK = 0.04 flashes/km2
/year [3]
3.2 Exposure Rate of the Selected Scheme
Without direct stroke lightning protection, the failure rate is determined by the number of flashes
predicted to strike within the station area [1].
As shown in figure 4, the equipment area of the substation is 2930 m2
or 0.002930 km2
and thus the total
expected strikes within the substation is:
X = 0.04 flashes/km2
/year x 0.002930 km2
X = 1.172 x 10-4
flashes/year or 8,532 years between flashes
3.3 Tolerable Risk for a Substation
IEC Standard 62305-2 – 2010 [5] identifies the tolerable risk RT for a substation, where the risk level is
affected by different types of losses. Referring to table 2, the risk level for a substation is defined in L2,
loss of service to the public, RT = 10-3
[4].
Types of loss RT (y-1
)
L1 Loss of human life or permanent injuries 10-5
L2 Loss of service to the public 10-3
L3 Loss of cultural heritage 10-4
L4 Loss of economic value Cost/benefit comparison
Table 2 – Typical Values of Tolerable Risk RT
Based on the risk evaluation and low incidence of strikes in this region, the overall risk with the station
unprotected can be kept within acceptable risk levels per IEC 62305-2.
7. Figure 4: Substation Equipment Area
4.0 Risk Evaluation for Each Method
4.1 Rolling Sphere Method
The rolling sphere method is typically small with a 0.05% failure rate [1]. If masts and shield wires were
installed as per the original design, the probability of a strike reaching the equipment or bus is:
X = 1.172 x 10-4
flashes/year x 0.0005
X = 5.86 x 10-8
flashes/year or 17,064,846 years between flashes that strike the equipment or bus
4.2 Fixed Angle Methods
A normally accepted failure rate for α and β = 45⁰ is approximately 0.2% [1]. Complete coverage using
fixed angle with α and β = 45⁰ results in the probability of a strike reaching the equipment or bus:
X = 1.172 x 10-4
flashes/year x 0.002
8. X = 2.344 x 10-7
flashes/year or 4,266,211 years between flashes
Since the fixed angle method design is based on the pre-determined location of lightning masts and
surrounding shield wires that were selected based on the rolling sphere method, the station will be
partially exposed.
4.2.1 Risk Evaluation with an Additional Lightning Spire, Option 1
Referring to figure 3, the unshielded area within the substation is 1349 m2
and the shielded area is 1581
m2
.
The probability of a lightning strike within the unshielded area is:
X = 0.04 flashes/km2
/year x 0.001349 km2
X = 5.396 x 10-5
strikes/year
The probability of a strike hitting the shielded area is:
X = 0.04 flashes/km2
/year x 0.001581 km2
x 0.002
X = 1.265 x 10-7
strikes/year
Combining these probabilities, we have:
Total probability of strike = 5.396 x 10-5
+ 1.265 x 10-7
= 5.409 x 10-5
strikes/year or 18,489 years
between strikes.
4.2.2 Risk Evaluation with Fixed Angle Method of α = 45⁰, β = 45⁰ only, Option 2
Referring to figure 2, without the lightning spire, the unshielded area within the substation is 1920 m2
and
the shielded area is 1010 m2
.
The probability of a strike hitting the unshielded area is:
X = 0.04 flashes/km2
/year x 0.001920 km2
X = 7.68 x 10-5
strikes/year
The probability of a strike hitting the shielded area is:
X = 0.04 flashes/km2
/year x 0.001010 km2
x 0.002
X = 8.1 x 10-8
strikes/year
Combining these probabilities, we have:
Total probability of strike = 7.68 x 10-5
+ 8.1 x 10-8
= 7.69 x 10-5
strikes/year or 13,007 years between
strikes.
9. 5.0 Comparison between Rolling Sphere Method and Fixed Angle Method
The rolling sphere method provides superior protection from strikes to the substation’s equipment,
however, the low historical GFD and the small equipment area mean there is a low anticipated frequency
of strikes within the equipment area. The comparison proves that fixed angle method with α and β = 45⁰
reduces the strike probability to a value which is several orders of magnitude below accepted values of RT
= 10-3
y-1
.
Table 3 shows the comparison of failure rate among each method.
IEC
62305-2
L3
No
Lightning
Protection
Lightning
Protection -
Rolling Sphere
Method
Lightning
Protection – Fixed
Angle Method,
Option 1
Lightning
Protection –
Fixed Angle
Method, Option 2
Failure Rate
(y-1
)
10-3
1.2 x 10-4
5.9 x 10-8
5.4 x 10-5
7.7 x 10-5
Table 3: Comparison of Failure Rates for Various Protection Methods
5.1 Comparison between Fixed Angle Method Option 1 and Option 2
Option 1 offers greater lightning shielding coverage. However, the costs and construction risks of
installing a 15.2 m tower inside the substation, together with the low incidence of strikes in this region
makes option 2 more favorable.
Although option 2 has a higher probability of having lightning strike on the equipment or bus, the
likelihood of such an event is still extremely small. Furthermore, one should also consider for the fact that
most instances of a strike to equipment or bus would not lead to a full station outage if N-1 redundancy is
available. Replacing the damaged equipment is likely the worst case scenario if lightning were to strike it.
Table 4 gives a comparison between these two options.
10. Option 1 – New 60 ft. Spire Option 2 – No Change to Existing Design,
only perimeter masts and shield wires and existing
internal spires
Pros Greater station protection.
Lower probability of direct
strike to equipment
Adequate station protection achieved (several
magnitudes lower than IEC 62305-2)
Does not need to modify existing design
Have the option of using rolling sphere
method should an outage be available during
construction
No additional cost if rolling sphere method
cannot be implemented during construction
Cons Installing the spire would
require outages.
Increased congestion in the
switchyard due to new spire
Construction costs and risks
erecting spire near equipment
Higher probability of future strikes to
equipment compared to option 1
Table 4: Comparison between Option 1 and Option 2
6.0 Conclusion
The risk evaluations performed in this case study are useful for future projects. Fixed angle method may
be suggested as a mean of lightning protection to the client where their facilities are located in areas with
low incidence of lightning strikes.
This case study also serves as a good example of the considerations for upgrading lighting protection
schemes within brownfield substations. It highlights the importance of preparing the construction staging
plan in the early stages of projects. Being able to identify the availability of required outages allows the
design team to ensure their design is constructible. Any modification due to unforeseen circumstances
during construction often means the delay of schedule, as well as significant amount of costs.
It is also important to agree upon a minimum acceptable failure rate for substations with the owner and
operator based on the substation size and importance of the station to help determine the overall required
system protection levels. This allows alternative lightning protection design methods, such as the fixed
angle method, to be considered.
11. 7.0 References
[1] “IEEE Guide for Direct Lightning Stroke Shielding of Substations,” IEEE Std. 998-2012, 2012.
[2] Horvath, T., Computation of Lightning Protection, Taunton, Somerset, England: Research Studies
Press, 1991.
[3] “Lightning Activity in Canadian Cities,” 4 July 2013. [Online]. Available: https://ec.gc.ca/foudre-
lightning/default.asp?lang=En&n=4871AAE6-1.
[4] “Protection against lightning – Part 2: Risk Management, “ IEC 62305-2:2010, 2010.
[5] “IEC International Standard,
Protection Against Lightning – Part
2: Risk Management,” IEC 62305-2,
Edition 2.0, 2010-12.