Journal articles: 'Grounding device'

1

Yue, Yun kai, and Tian bo Wu. "Analysis of abnormal heating of 66kV dry-type air-core reactor grounding device." Journal of Physics: Conference Series 2237, no. 1 (March 1, 2022): 012014. http://dx.doi.org/10.1088/1742-6596/2237/1/012014.

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Abstract When dry-type air-core reactors are in operation, the surrounding grounding devices, fences and other closed structural parts are abnormally hot. Because there is no effective analysis and detection methods for concealed projects such as grounding devices, it brings great difficulties to on-site analysis of problems; this article is based on the site conditions Theoretical analysis and the use of ground penetrating radar detection technology to study a 66kV dry-type reactor grounding device abnormal heating problem, through the analysis of the detection results, it is found that the reason for the heating of the dry anti-grounding device is that the grounding device has a circulating current in the alternating field; The design and construction of grounding devices of dry-type air-core reactors in new projects will provide certain reference significance.

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Xu, Biao, Yuxin Xu, Fan Ouyang, Hui LI, Wenwu Liang, and Yusheng Gong. "Performance test of small-current grounding line selection device based on the real-time digital simulation system." Journal of Physics: Conference Series 2137, no. 1 (December 1, 2021): 012010. http://dx.doi.org/10.1088/1742-6596/2137/1/012010.

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Abstract Single phase grounding fault is the most common fault type in small-current grounding distribution network, but the small-current grounding line selection device put into operation on site is often difficult to meet the application requirements, affecting the rapid and accurate treatment of grounding fault. Considering that there are many small-current grounding line selection manufacturers and various device forms, it is difficult to intuitively evaluate the line selection performance of different devices and make horizontal comparison, and there is no supporting basis for the selection and application of on-site line selection devices. Therefore, based on the real-time digital simulation system (RTDS), this paper establishes a test platform for small-current grounding line selection device. Based on the constructed test platform, four line selection devices form different manufacturers are tested in parallel, the performance of the devices is compared, and the influencing factors affecting the accuracy of line selection results are analyzed. The conclusions of this paper can provide strong support for the pilot application of small-current line selection devices.

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Li, Bo, Yan Jun Pang, Jian Feng Li, Ying Li, Chang Xin Ge, Yi Shan, Qing Hao Wang, Tian Shu Hai, Zhi Li, and Yi Ran Li. "The Research on the Integrational Measurement Device of Grounding Resistance." Advanced Materials Research 986-987 (July 2014): 1624–28. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.1624.

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Measuring grounding resistance is the only basis to judge the grounding of electrical equipment is good or not. Aim at the trouble on retracting and releasing of the current lead wire and voltage lead wire;the insecure connection Lead wire and grounding resistance tramegger、grounding crooked chisel and so on;The hectic trouble such as placing or picking the grounding resistance testing equipment, we developed the integrational measurement device of grounding resistance. It mainly introduces the structure and design principle of the device, and provides the related technical essentials. Combined with the actual application,and demonstrates its convenience and flexibility by the force of contrast; Through the case analysis, fully demonstrates the device is feasible、creative and rationality.

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Liu, Mengxuan, Chi Zhang, and Kangli Liu. "Simulation and Experiment Analysis of 10 kV Flexible Grounding Device." Information 12, no. 9 (September 19, 2021): 384. http://dx.doi.org/10.3390/info12090384.

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The traditional 10 kV distribution network grounding system has some disadvantages, such as small grounding current and poor arc extinguishing effect, thus, hindering the detection of high-resistance grounding fault. Therefore, this paper studied the flexible grounding system consisting of small-resistance and active inverter in parallel. The control system comprises the compensation current calculation module, the fault detection module, and line protection strategy. During a single-phase grounding fault, the device is designed to inject a current of a given amplitude and phase into the neutral point to effectively suppress fault-point voltage and current and, meanwhile, quickly identifying the fault line or the busbar fault and then systematically protecting the distribution line. In addition, a large number of simulations have performed based on three grounding faults (metal, low-resistance, and high-resistance) and two modes (ungrounded and small-resistance grounding). The device can all be functional. Finally, a 400 V-level experimental prototype was built, and the experimental results are consistent with the simulation results, which can verify the effectiveness and feasibility of the flexible grounding device.

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KARYAKIN, Rudolf N., and Viktor G. LOSEV. "Lightning Strike at a Grounding Device." Elektrichestvo 3, no. 3 (2020): 28–38. http://dx.doi.org/10.24160/0013-5380-2020-3-28-38.

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6

Zhou, Jin Long, Jin Ling Lu, and Chao Xu. "A New Evaluation System Method for Small Current Grounding Line Selection Device." Advanced Materials Research 960-961 (June 2014): 1043–47. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.1043.

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Abstract: The evaluation of small current grounding line selection device plays an important guiding part in fault diagnosis and device promotion. But the current methods focus on the evaluation of individual indicator and can not form systematic evaluation of the programs.This paper firstly makes use of AHP method to evaluate small current grounding line selection device, and establishes the evaluation system of small current grounding line selection device. During the weight solution process, this paper uses three scale method to determine the comprehensive weight of individual indicator, and achieves a combination of expertise and quantitative, qualitative assessment of the results. The practical case analysis of small current grounding line selection device proves the validity and practicability of this method, which is of great theoretical and practical significance.

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Grinkevich, V. A., and G. V. Seroklinov. "Selecting grounding points to reduce the interference level of the signal of high-impedance measuring channel." Siberian Herald of Agricultural Science 50, no. 4 (September 25, 2020): 103–13. http://dx.doi.org/10.26898/0370-8799-2020-4-12.

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The study was carried out (2020) to reduce the effect of electromagnetic interference generated by a device for the formation of temperature effects based on Peltier element on a plant biopotential meter. Four variants of equipment grounding circuits are considered in the absence of a separate grounding bus for power equipment; graphs of biopotential signals are given. The type of interference that the device for the formation of temperature effects induces on the biopotential measurement channel is shown. The control unit case for the temperature-controlled stage based on Peltier element and the power cable shield for connecting Peltier element to the control unit must be grounded at a separate point from the biopotential meter. Biopotential meter electrodes should be grounded as far as possible from the control unit case and at a separate point from the grounding of the plate of the temperature-controlled stage. Recommendations are given for the grounding of high impedance input measuring devices and the power equipment emitting powerful inductive interference and causing interference in the grounding bus located in the same laboratory room, in the absence of separate grounding for power equipment. To reduce interference to an acceptable level, in addition to the selection of the grounding point, filtering is required. If the grounding point is selected incorrectly, a signal with a high level of interference is present at the filter output. The application of the proposed recommendations for grounding a device for the formation of a temperature effect based on Peltier element and a biopotential meter makes it possible to assess the response of a plant placed on the temperature-controlled stage to a temperature effect and not complicate programmed filtering of the signal received by the biopotential meter.

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8

Akulichev, Vitali, Sergei Zakharov, Igor Rodionov, Sergei Visich, Mikhail Panarin, and Anna Maslova. "Mathematical model of remote monitoring for grounding devices on overhead power line poles by measuring grounding device resistance." Energy Safety and Energy Economy 5 (October 2021): 37–42. http://dx.doi.org/10.18635/2071-2219-2021-5-37-42.

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We report that we have built a mathematical model of a remote monitoring module for the purpose of control grounding devices located on overhead power line poles. The invention is based on measuring grounding device resistance. Resistance measurements conducted by the said monitoring module go directly to a power company’s control room. All measurements are being conducted and transferred to a control room with a specific frequency.

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9

Abdul Ali, Abdul Wali, Nurul Nadia Ahmad, and Normiza Mohamad Nor. "Effect of Impulse Polarity on a New Grounding Device with Spike Rods (GDSR)." Energies 13, no. 18 (September 8, 2020): 4672. http://dx.doi.org/10.3390/en13184672.

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The characterizations of grounding systems subjected to high impulse conditions are known to be dependent on the polarity, current to peak time and discharge time, as well as the electrical properties of the soil, and the grounding electrodes themselves. It is therefore important to investigate the behavior of grounding systems under high impulse conditions under negative impulse polarity, and compare it with positive impulse polarity results. Experimental test results for the same grounding systems installed with various earth electrodes at several sites under positive impulse polarity have previously been presented. In comparison, this paper presents the results of negative impulse polarity injected on the same grounding systems. It is found that a significant difference between positive and negative impulse polarities is observed for the grounding systems installed at high soil resistivity.

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10

Zhang, Zhanlong, Huarui Ye, Yihua Dan, Ziang Duanmu, Jun Deng, Chengfeng Gao, and Pengfei Gan. "Study on corrosion fracture diagnosis method of grounding wire of tower grounding device." Measurement 166 (December 2020): 108213. http://dx.doi.org/10.1016/j.measurement.2020.108213.

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11

Meng, Zhen, Zhongwei Li, and Yueming Pan. "Application of 66kV Active Intervention Grounding Arc Suppression Device." Journal of Physics: Conference Series 2076, no. 1 (November 1, 2021): 012111. http://dx.doi.org/10.1088/1742-6596/2076/1/012111.

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Abstract The energy supply is mainly based on electric energy at present, and power supply reliability is an important indicator for evaluating power supply services. In view of the 66kV transmission voltage level unique to Northeast my country, the neutral point of the transmission system directly affects the stable operation of the power system. First, the composition of the substation in the system and the working principle of the arc suppression device are analyzed. Secondly, when a single-phase grounding fault occurs in a 66kV neutral point ungrounded system, an active intervention grounding arc suppression device is designed. Finally, the operating characteristics of the designed grounding arc suppression device are demonstrated based on the simulation results.

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Chakkaew, Anusorn, and Wisut Titiroongruang. "Electrostatic Control and New Device Handling Consideration for MEMS Manufacturing Process." Advanced Materials Research 378-379 (October 2011): 659–62. http://dx.doi.org/10.4028/www.scientific.net/amr.378-379.659.

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Electrostatic potential and electrostatic discharge (ESD) has been a factory issue for years, not only limited to semiconductor-based electronic devices, but there are evidences that new devices from emerging technologies become sensitive which are MEMS and NEMS. This paper describes new electrostatic control and device handling solutions for critical electrostatic control environment for MEMS manufacturing processes. There are experiments of personnel grounding devices, device handling materials, and evaluation of static control surfaces.

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13

Guo, An Xiang, Wei Juan Hu, Ai Jun Yan, Zhi Qiang Yang, and La Jun Feng. "Situation and Development on Soil Corrosion of Metallic Materials of HVDC Power Transmission Project." Materials Science Forum 852 (April 2016): 218–25. http://dx.doi.org/10.4028/www.scientific.net/msf.852.218.

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UHVDC transmission could deliver high-power electricity over long distances effectively, while the DC stray current led to corrosion of grounding device and the surrounding buried metal during the operation inevitably. This paper reviewed the research progress of HVDC corrosion at home and abroad in recent years. It elaborated corrosion research direction of HVDC system from three aspects, which were pole, grounding grid and the neighboring tower grounding body buried pipeline respectively. Describing the anti-corrosion measures on grounding devices and buried pipeline, and explaining the advantages and defects of various anti-corrosion technology. At last, we proposed that it was necessary to expand the research in UHVDC field, grasp the erosion rule of DC stray current in soil comprehensively to enhance the security of UHVDC transmission system of national grid.

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14

Kim, Juyong, Hyunmin Kim, Youngpyo Cho, Hongjoo Kim, and Jintae Cho. "Application of a DC Distribution System in Korea: A Case Study of the LVDC Project." Applied Sciences 9, no. 6 (March 14, 2019): 1074. http://dx.doi.org/10.3390/app9061074.

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With the rapid expansion of renewable energy and digital devices, there is a need for direct current (DC) distribution technology that can increase energy efficiency. As a result, DC distribution research is actively underway to cope with the sudden digitization and decentralization of load environment and power supply. To verify the possibility of DC distribution, Korea Electric Power Corporation (KEPCO) Research Institute made a DC distribution system connected with a real power system in Gwangju. The construction of the demonstration area mainly includes design of protection and grounding systems, operating procedures of insulation monitoring device (IMD), and construction of power converters. Furthermore, this paper goes beyond the simulation and the lab testing to apply DC distribution to a real system operation in advance. It is designed as a long-distance low-loaded customer for rural areas and operated by the DC distribution. In addition, safety and reliability are confirmed through field tests of DC distribution elements such as power conversion devices, protection and grounding systems. In particular, to improve the reliability of non-grounding system, the insulation monitoring device was installed and the algorithms of its operational procedures are proposed. Finally, this paper analyzes the problems caused by operating the actual DC distribution and suggests solutions accordingly.

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15

Taqiyyudin Alawiy, Muhammad. "Simulasi Sistem Pentanahan Dengan Memodifikasi Konsentrasi Kadar Garam." JE-Unisla 5, no. 1 (April 8, 2020): 303. http://dx.doi.org/10.30736/je.v5i1.418.

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Grounding system takes a very important role in the electricity and electronics device protection system. The system is used for releasing current disturbance to the ground method. The smaller value of grounding system will give better system. In the certain ground, grounding resistance value is influenced by the depth and distance within the electrodes. The goal of this research is to find the characteristic of rod electrode grounding resistance and design computation method to calculate rod electrode resistance by changing its values and finally it can be used for the protection devices system reference. This research uses three point method to inject AC current into the electrode under test and a current probe and will give a potential between the earth electrode and the potential electrode, so the value of grounding resistance can be found. The result of the analysis indicates that the value of grounding resistance will be smaller when the deep of the planting, the amount of the rod electrode buried and the distance of it are added. The decrease of grounding resistance value will be effective to 75 cm in deep and 300 cm in distance. While planting of rod electrode is deeper more than 75 cm and more 300 cm in distance not effective, because it can reduce the value of grounding resistance which does not have any mean. Therefore, to get the small value of grounding resistance effectively, it is advised to add the amount of the electrode which is planted parallely. With the rod electrode installed before. However, it is important to notice when making the grounding system is the resistivity value of small and great of the ground where the stability of grounding resistance is mounted. Finally, in planting grounding electrode it is important to have the geology data of the ground where the system applied.

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16

Wang, Xiujuan, Zhihong Fu, Yao Wang, Renkuan Liu, and Lin Chen. "A Non-Destructive Testing Method for Fault Detection of Substation Grounding Grids." Sensors 19, no. 9 (May 2, 2019): 2046. http://dx.doi.org/10.3390/s19092046.

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The grounding grid is critical to the safety and stability of a power system. Corrosive cracking of the grounding conductor is the main cause of deterioration of grounding grid performance. Existing fault diagnosis methods for grounding grids are limited by the number and distribution of grounding leads, and some of them cannot be used for online detection. This paper proposes a grounding grid detection method based on magnetic source excitation. The measuring device consists of four coils, two horizontal excitation coils, and two vertical receiving coils. The secondary magnetic field signal is extracted from the primary field and the background field by properly positioning the coils, such that the measured signal can reflect the underground media more accurately. The measuring device of the method is portable, the measurement process is contactless with the grounding grid, and it is not limited by the grounding leads. Furthermore, it has a strong anti-interference ability and can realize online detection. It was proven by simulations and experiments that the proposed method has a higher measurement accuracy and stronger anti-interference ability when compared with existing methods. This paper also discusses the influence of various factors such as the number and the location of the breakpoints, the frequency of the excitation source, the soil resistivity, and stratification from the measurement data. It was proven that the method has high precision and a wide application range, and is important for guiding significance and reference value in engineering applications.

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Rajsiri, Supphachan, Kanokporn Penpondee, and Sittiphun Tuntawiroon. "Development of Grounding Device to Reduce Current Variation in Submerged Arc Welding Process for Pressure Vessel Fabrication." Advanced Materials Research 1043 (October 2014): 268–72. http://dx.doi.org/10.4028/www.scientific.net/amr.1043.268.

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This study developed a device to solve welding problems that occur in the manufacturing of a pressure vessel for cryogenic applications under the ASME Section VIII Division 1. The cylindrical body of the vessel was assembled with short pre-fabricated cylinders and caps using submerged arc welding. The rotatable grounding electrode was mounted to the top half of the spherical cap. However, the relatively long distance between the welding and the electrode grounding locations, especially in longer vessels, restricts the flow and the distribution of the electrical current. Radiographic testing identified lack of fusion as the major reason for the restricted flow of the electrical current. This also caused additional work on welding repair. To address this issue that compromised both top-outer and bottom-inner vertical positions for circumference welding, a new grounding device was developed to reduce the flow distance. The electrical conductivity was also improved through a series of welding tests. The investigation showed that a greater average welding current increased arc stability. Radiographic testing confirmed that the vessels were welded completely suggesting the grounding device utility for increasing welding joint soundness of the circumference weldment.

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Zhang, Zhanlong, Huarui Ye, Yihua Dan, Ziang Duanmu, Yiqiao Li, and Jun Deng. "Novel Method for Comprehensive Corrosion Evaluation of Grounding Device." IEEE Access 8 (2020): 72102–11. http://dx.doi.org/10.1109/access.2020.2985534.

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Sidorov, A., R. Abdullozoda, S. Sadullozoda, O. Saifiddinzoda, and I. Abdullozoda. "Method for determining the state of an grounding device." IOP Conference Series: Earth and Environmental Science 808, no. 1 (July 1, 2021): 012005. http://dx.doi.org/10.1088/1755-1315/808/1/012005.

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20

Xu, Zhi, Jianxiong Tang, Yupeng Jiang, Risheng Qin, Hongsheng Ma, Yongchun Yang, and Chengyong Zhao. "Analysis of Fault Characteristics of Distribution Network with PST Loop Closing Device under Small Current Grounding System." Energies 15, no. 7 (March 22, 2022): 2307. http://dx.doi.org/10.3390/en15072307.

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With the rapid development of cities and the increasing complexity of distribution network systems, the cableization of transmission lines and the diversification of power users have brought new challenges to the supply reliability of distribution networks. Short-time outages caused by power outages and maintenance are one of the factors that affect the reliability of the power supply in the distribution network. The non-stop load transfer through a phase-shifting transformer (PST) operation can effectively improve the reliability of power supply to complex distribution systems. Considering the operation mode and structure form and fault type of the urban distribution network in China, comparing and analyzing the applicable scenarios of different neutral grounding methods, and based on the structure and zero sequence path characteristics of PST, an improved PST-based phase shifting and grounding transformer loop closing device with low power consumption is proposed. The fault characteristics of the PST-based loop closing device under the small current grounding system are also analyzed by the sequence component method, and, finally, the effectiveness of the phase-shifting and grounding transformer device is verified by simulation under PSCAD/EMTDC for fault routing and protection configuration of the urban distribution network in China.

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Chervonchenko, S. S., and A. S. Brilinskiy. "Research of potential on the grounding device in the network with low-impendance resistive neutral grounding." IOP Conference Series: Materials Science and Engineering 643 (November 13, 2019): 012057. http://dx.doi.org/10.1088/1757-899x/643/1/012057.

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Huang, Chu, Tian Chen, Shi Yu Xia, Peng Zhou, and Zhan Long Zhang. "Application of Smart Tool Cabinet in the Temporary Grounding Wire Management." Applied Mechanics and Materials 419 (October 2013): 688–92. http://dx.doi.org/10.4028/www.scientific.net/amm.419.688.

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Temporary grounding wire is an important insurance to protect the safety of maintenance personnel and the power line, in order to prevent wrong operation such as switching on breaker with the grounding wire linked, this paper developed an smart tool cabinet to orderly place grounding wire, making it convenient for substation management personnel to check the information and ensure proper operation. Intelligence tool cabinet contains position sensors, RFID device, the central processing unit and GPRS wireless communication module and so on, it can send information of grounding wire such as time, number, and status back to the PC automatically and timely without attendants filling out the information form. The good operation of the system shows that managing grounding wire with the tool cabinet is feasible.

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23

Chen, Tingji, Lian Yang, Weibing Gu, Haiyang Gao, Junchi Zhou, and Xiaodong Fu. "Impact of Lightning Protection Grounding System on the Ground Surface Potential of Substations." Journal of Physics: Conference Series 2148, no. 1 (January 1, 2022): 012049. http://dx.doi.org/10.1088/1742-6596/2148/1/012049.

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Abstract Grounding device is an indispensable facility for lightning protection of buildings. Nowadays, SGCC (State Grid Corporation of China) is promoting steel structure substations, which are made of metal as a whole including the roof. There are now several grounding approaches when the roof was struck by a lightning flash, including external grounding, nearby grounding, separate grounding and common grounding. This paper took a metal structure substation in Nanjing as an example and calculated its ground potential in case of different grounding system. We came to such conclusions: 1) For substations of separate grounding system, the ground potential after a lightning strike could reach as high as 743.5kV and 230kV with a single earthing electrode and multiple electrodes respectively. 1000μs after the strike, the ground potential is 91.57 kV, which is still a significant threat to humans and equipment inside. 2) Nearby grounding and external grounding are both common grounding system. The peak of ground potential after a lightning strike is 101.4kV and 109kV respectively, much lower than that of separate grounding system. They also have similar waveform and peak time. 3) 3500μs after the lightning strike, the ground potential all over the grid is around 36V. 4) Separate grounding is not a sound choice of grounding system for steel structure substations. From the perspective of cost and discharging capacity, nearby grounding is the most reasonable scheme for a steel structure substation.

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Yu, Wen Bo, Xiao Lin Luo, Bing Chen, and Wen Xiang Wang. "Research of Mountain Area Wind Farm Grounding Scheme." Applied Mechanics and Materials 584-586 (July 2014): 2695–99. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.2695.

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Wind power has become one of the most potential and vital green energy sources. Location of the wind farm has a better wind resource，and it is also relatively open. Lightning accident in the wind farm happened occasionally, in order to avoid the situation, which impulse current damages the wind turbine, in the accident, lightning protection grounding system of wind turbine is essential .In this paper, according to the experience of Dongshan wind farm project , the method of how to design the wind turbines and booster station grounding grid as required, the calculation of ground resistance and specific measures to reduce grounding resistance of wind turbine grounding device are discussed.

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Morris, Scott, and Dan Carey. "Study of Grounding Schemes Utilized in Conformal Shielding Applications." International Symposium on Microelectronics 2010, no. 1 (January 1, 2010): 000906–11. http://dx.doi.org/10.4071/isom-2010-tha4-paper6.

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There are many different shielding technologies available for electromagnetic interference (EMI) shielding in radio frequency (RF) applications. We will investigate various EMI shielding technologies, one of which is RFMD's MicroShield™ Integrated RF Shielding technology's conformal plating process that encapsulates the device with a solid sheet of metal. This novel technology provides improvements in form factor, ease of use, and lower cost as compared to traditional shielding approaches. We will compare ground designs within the substrate to determine maximum EMI shield performance. An examination of ground structures, layer grounding, and external ground connections will be analyzed. The test device structure will be comprised of a radiating element on the top surface of the laminate. A thorough look at the advantages and limitations between these different EMI grounding configurations will be discussed. This data will be used to quantify grounding effectiveness which will, in turn, be used to generate design guidelines.

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Shabani, Arash, and Kazem Mazlumi. "Studying grounding arrangements of the LVDC system through simulation." SIMULATION 94, no. 5 (January 16, 2018): 441–49. http://dx.doi.org/10.1177/0037549717752069.

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Low-voltage DC (LVDC) systems may soon become an integral part of our electric grid. Faults on DC lines are usually pole-to-ground faults that depend on the grounding arrangement of the DC system. The grounding of the LVDC system is not adequately covered in the literature and there is no comprehensive standard for it. This paper studies the effect of various grounding arrangements of the LVDC system on pole-to-ground fault protection. An overall scheme of the LVDC system is modeled and a pole-to-ground fault is placed on the DC lines. Possible grounding arrangements are analyzed employing MATLAB/Simulink software and detailed discussion is given for each arrangement. Finally, simulation results are compared and a preferred grounding arrangement is selected with the objective of having selective and effective protection without device damage.

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Sukhachev, I. S., O. V. Smirnov, S. V. Vorobjeva, and T. V. Mikhaleva. "DIAGNOSTICS, RELIABILITY IMPROVEMENT AND A RESIDUAL RESOURCE OF SOME PROTECTION SYSTEMS." Oil and Gas Studies, no. 1 (February 28, 2015): 105–8. http://dx.doi.org/10.31660/0445-0108-2015-1-105-108.

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Nizhevskyi, I. V., and V. I. Nizhevskyi. "A TECHNIQUE OF MEASURING OF RESISTANCE OF A GROUNDING DEVICE." Electrical Engineering & Electromechanics, no. 3 (June 25, 2016): 50. http://dx.doi.org/10.20998/2074-272x.2016.3.08.

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Nizhevskyi, I. V., V. I. Nizhevskyi, and V. E. Bondarenko. "THE EXPERIMENTAL VALIDATION OF THE GROUNDING DEVICE RESISTANCE MEASUREMENT METHOD." Electrical Engineering & Electromechanics, no. 6 (December 19, 2016): 60–64. http://dx.doi.org/10.20998/2074-272x.2016.6.10.

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Ezawa, Masashi, Hiroshi Makino, and Tadao Futami. "Development of a New Grounding Device for Medical Electrical Equipment." IEEE Engineering in Medicine and Biology Magazine 5, no. 3 (September 1986): 65–67. http://dx.doi.org/10.1109/memb.1986.5006311.

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Shu, Yi Shi, Li Li Ma, and Pei Jie Yu. "Feasibility Analysis of Tripping in Small Current Grounding System." Applied Mechanics and Materials 130-134 (October 2011): 4240–44. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.4240.

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With the development of integrated automation systems and distribution automation technology, considering the safety of grid equipment, the voltage security of low-voltage power grid, personal safety and the characteristics of small current grounding system , this paper points out that still follow the old rules that run 0.5-2 hours allowed in dealing with ground fault of small current grounding system is unreasonable, elaborates the new philosophy that the protection function of small current grounding should be distributed to the feeder protection device and implemented tripping. Theoretical analysis shows that the scheme is accurate, reliable, and highly practical.

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Chen, Gang, Zhong Li, Ping Li, Lei Liu, Miao Wang, Yan Jun Pang, and Yan Li. "A Substation DC System Grounding Fault Analysis and Processing." Applied Mechanics and Materials 494-495 (February 2014): 1784–86. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.1784.

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A 220kV substation DC system ground fault detailed analysis and lookup scheme are proposed in this paper. The ground fault was mainly due to the cold weather as well as equipment wiring unreasonable wear the cable jacket rupture, causing 220kV main transformer cooler control box on the 2nd DC grounding occurred. In addition, through this ground fault finding, also found a DC system insulation monitoring device functional shortcomings and DC circuit loop back problems exist, the paper put forward DC circuit loop back detailed solutions, and the insulation monitoring device of the transformation proposal are proposed.

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Fu, Zhihong, Xiujuan Wang, Qian Wang, Xiaobin Xu, Nengyi Fu, and Shanqiang Qin. "Advances and Challenges of Corrosion and Topology Detection of Grounding Grid." Applied Sciences 9, no. 11 (June 3, 2019): 2290. http://dx.doi.org/10.3390/app9112290.

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The grounding device plays performs the role of releasing a lightning current and a fault current in the power system, and the corrosion of the conductor will cause damage to the grounding body, which threatens the safe operation of the power system. The grounding grid corrosion detection technology and equipment guarantee the safe operation of the power system. This paper discusses the research status of grounding corrosion and topological detection in detail and introduces the basic principles, research difficulties and existing problems of the methods such as the electric network method, electromagnetic field method, electrochemical method, ultrasonic detection method and electromagnetic imaging method. The methods of electromagnetic imaging and time difference positioning proposed in recent years have been also discussed in detail. The paper points out that the application of grounding grid corrosion detection distance engineering still faces great challenges and that multi-disciplinary, multi-information fusion, new sensing technology, big data platforms and intelligent computing will be the trends to follow in research on grounding grid fault, corrosion detection and life prediction.

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Wang, Guozhong, Yin Zeng, Juanping Shen, and Hongming Zhu. "Grounding fault detection and type determination of substation DC system." E3S Web of Conferences 252 (2021): 01045. http://dx.doi.org/10.1051/e3sconf/202125201045.

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The DC system is used as the power supply for all kinds of protection, measurement and control, safety automation and other devices in the substation. It is the fundamental guarantee of power system control and protection. If the substation DC system fails, it will have a destructive impact on the entire substation system and function. Based on this, in order to solve the problems of maloperation and refusal of protection device caused by grounding fault of DC system, a method combining unbalanced bridge method with leakage current sensor is proposed to detect the grounding resistance of bus and branch. On this basis, the neural network optimized by quantum particle swarm optimization is used to determine the fault type. Finally, the effectiveness of the proposed method is verified by MATLAB/Simulink simulation.

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Cui, Jiang Xia, and Jing Yi Du. "Evaluation Study of Grounding Grids Based on Gray Clustering." Applied Mechanics and Materials 433-435 (October 2013): 550–54. http://dx.doi.org/10.4028/www.scientific.net/amm.433-435.550.

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Grounding grid is an important device which ensures the safe operation of substation. Its corrosion is influenced by various factors and the influence of these factors is varied. It is difficult to infer the relationship between the corrosion rate and its influencing factors, so this paper apply the grey clustering method of grey system theory in the grounding grid corrosion and gives an application instance and realizes it by MATLAB. The results demonstrate the practicality and effectiveness of the method mentioned in this paper. This method can provide reference for high reliability for related departments in the implementation of emergency situation due to grounding grid corrosion.

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Han, Xiaoyan, Donghui Luo, Xin Zhang, Yongxing Cao, Yu Zhang, and Gege Ban. "Study on Evaluation Method of Impulse Dispersion Performance of Grounding Device Using X-ray Imagining System." Energies 14, no. 16 (August 19, 2021): 5124. http://dx.doi.org/10.3390/en14165124.

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When the lightning current enters the ground through the grounding system, the impulse dispersion performance can be observed by the phenomenon of soil spark discharge, which is fundamentally determined by the nearby soil. At present, engineers use an empirical formula to convert the soil spark discharge to the impulse coefficient of impulse grounding resistance. Therefore, there is no available quantitative analysis method to evaluate soil impulse dispersion performance. To solve this problem, this paper proposes an evaluation method for the impulse discharge efficiency of soil by using X-ray images, define VI as the parameter, which is the ratio of the volume of the discharge area to the peak current. Then, the rationality and validity of the method are verified. Finally, the variation rules of impulse discharge efficiency are analyzed in different soils. Results show that the VI can reflect the change rules of impulse dispersion performance more clearly under different soil conditions, and this parameter provides a new idea for enhancing the impulse dispersion performance of soil near the grounding electrode.

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Luo, Donghui, Yongxing Cao, Yu Zhang, Shijun Xie, Chenmeng Zhang, and Shuping Cao. "Study on Structural Parameters and Analysis Method of Soil Successive Impulse Discharge Channel." Energies 14, no. 4 (February 8, 2021): 877. http://dx.doi.org/10.3390/en14040877.

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The transient analysis model of grounding systems is an important tool to analyze the lightning characteristics of grounding devices. When lightning enters the soil through the grounding device, there is a centralized discharge channel. The spatial structure of the discharge channel in the soil has a great effect on the accuracy of the transient analysis model of the soil impulse discharge. In this paper, based on the gray information analysis method, the volume of successive impulse discharge channels in the ground under various currents and soil conditions is calculated, and the changing law with time interval is analyzed. According to the experimental results, an analysis method of the model considering the discharge channel structure is proposed, and an example is analyzed. The results show that the time interval has an effect on the volume of the discharge channel. In a certain range, the volume of the channel increases with the time interval of successive impulse discharges. Taking the critical breakdown electric field strength as the judgment condition and the residual resistivity as the variable, the development process of the discharge channel can be simulated. The calculated results of the model are close to the experimental results.

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Li, Hengzhen, Zilan He, Sixiang Chen, Ming Zhang, Yingjun Shu, and Chen Hu. "Analysis on the impact characteristics of grounding device considering spark effect." Journal of Physics: Conference Series 1585 (July 2020): 012003. http://dx.doi.org/10.1088/1742-6596/1585/1/012003.

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Li, Gang, Xiangli Lin, Yingying Liu, Lun Li, Qingshan Liu, Jishun Guo, and Zilian Zhao. "Labyrinth structure sealing performance on grounding device of railway passenger vehicles." IOP Conference Series: Materials Science and Engineering 612 (October 19, 2019): 032199. http://dx.doi.org/10.1088/1757-899x/612/3/032199.

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Wang, Donghui, and Chunming Liu. "Combination Optimization Configuration Method of Capacitance and Resistance Devices for Suppressing DC Bias in Transformers." Energies 12, no. 9 (May 13, 2019): 1813. http://dx.doi.org/10.3390/en12091813.

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The ground current of a high-voltage direct current (HVDC) transmission system can cause DC bias in transformers near the grounding electrode during monopole operations, which affects the alternating current (AC) power system operation. Owing to multiple bias current flow paths, a capacitance blocking device installed at the neutral point of a transformer may increase the DC bias in adjacent transformers, while suppressing the DC current in that transformer. This paper introduces the use of an effective bias current indicator to describe the effect of the grounding current on transformers in a network, considering the wiring characteristics of the autotransformers and the power system topology. Additionally, a combination optimization method for the capacitance and resistance is applied in order to determine the minimum number of installed devices that restrict the maximum effective bias current throughout the network to a permissible range. A genetic algorithm based on an improved roulette selection method is adopted to solve the optimal configuration problem. The method is validated by using a test case based on the Xizhe HVDC transmission receiving-end grid near the Jinsi grounding electrode. The configuration of the capacitance and resistance was optimized by the improved genetic algorithm. This method can achieve the desired level of DC bias management with fewer devices than the conventional method, which verifies the feasibility and superiority of the proposed optimization method.

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Qian, Wei, Mei Hong Qiu, Miao Wu, and Xian Yue Shi. "Fault Diagnosis of Grounding Grid Based on Genetic Algorithm and Neural Network." Advanced Materials Research 756-759 (September 2013): 4095–99. http://dx.doi.org/10.4028/www.scientific.net/amr.756-759.4095.

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The grounding grid of power plants and substations is an important device to ensure the safe and stable operation of electric power system. However, it is difficult to diagnose the fault of grounding grid using traditional method of identification. In recent years, the development of artificial neural network has provided effective ways to solve this problem. In this paper, neural network is used to diagnose fault of the grounding grid, because it has good learning and training characteristics, and performance of fault tolerance. It can search fault localization of the grounding grid. BP Algorithm has the advantage of the optimization accuracy, but there are some drawbacks, the majority of which is easy to fall into local minimum, slow convergence and cause oscillation effect. Genetic algorithm has a strong globe search capability, and can find the global optimal solution with high probability, so it can overcome the shortcomings of the BP algorithm using GA to complete the pre-search. This paper presents a hybrid training algorithm by GA combine with BP to optimize network. Simulation results show that the hybrid method has a fast convergence rate and high diagnostic accuracy for diagnosing the fault of grounding grid; it can be used in fault diagnosis of grounding grid effectively and reliably.

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Negara, I. Made Yulistya, Daniar Fahmi, Dimas Anton Asfani, IGN Satriyadi Hernanda, Rendi Bagus Pratama, and Arief Budi Ksatria. "Investigation and Improvement of Standard External Lightning Protection System: Industrial Case Study." Energies 14, no. 14 (July 8, 2021): 4118. http://dx.doi.org/10.3390/en14144118.

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In this study, the lightning protection system and grounding system of one plant of the petrochemical industry were investigated, evaluated, and improved. The methods used in this study were rolling sphere and angle protection methods. The grounding system of the building under study was modeled and simulated using ATP/EMTP (Alternative Transient Program/Electromagnetic Transient Program) software. The results show that the external lightning protection system of the prilling tower studied does not adhere to IEC 62305 and IEC 1024-1-1 standards. Moreover, the grounding configuration of the DCS building was not appropriate for protecting sensitive equipment inside. Lightning causes an enormous potential difference between lightning ground rods in the grounding system. Additionally, disabling the existing surge protective device (SPD) causes an increase in the magnitude of Ground Potential Rise at the DCS building. Improvement of the lightning protection system of the prilling tower and DCS building on Plant 1 of this petrochemical company as well as some other recommendations for improvements are proposed. This paper also shows evidence that external lightning protection, internal lightning protection, and the grounding system need to be connected to make an exemplary lightning protection system.

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Harrat, B., B. Nekhoul, M. Lefouili, K. Kerroum, and K. El khamlichi Drissi. "Transient Analysis of Grounding Systems Associated to Substation Structures under Lightning Strokes." Journal of Communications Software and Systems 3, no. 1 (March 22, 2007): 59. http://dx.doi.org/10.24138/jcomss.v3i1.270.

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In this paper we propose a new formalism for analyzing the transient behavior of grounding systems associated to substation structures (Faraday-cage) under lightning strokesin unsettled regime. The protective device to study is formed of a guard filet connected to a grounding grid by simple conductors called down conductors. Our formalism is based on the resolution of the propagation equation in potential on 3D. The purpose of our proposition is the direct analyzing in time domain and simple implementation. We compare the results obtained by this new approach to results published in literature.

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Khairi, Khairil Anuar, Mohd Faizal Jamlos, Surentiran Padmanathan, Mohd Aminudin Jamlos, and Muammar Mohamad Isa. "Low insertion loss of surface mount device low pass filter at 700 MHz." Bulletin of Electrical Engineering and Informatics 8, no. 2 (June 1, 2019): 382–88. http://dx.doi.org/10.11591/eei.v8i2.1386.

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The paper involved with the design, simulation and fabrication of 6th order elliptical-based Surface Mount Device (SMD) LPF with cutoff frequency at 700 MHz. Fabricated LPF is consisted of four PCB layers which components of SMD are soldered on the top layer. Another three layers is for grounding and shielding, power supply and grounding void. The four layers is crucial to avoid interference between components. The research has find out that the momentum simulation is definitely required to improve the signals response compared to a normal simulation by ADS software. The comparison between momentum simulated versus measured and normal simulated versus measured is 0.2 dB and 29 dB correspondingly. Such huge difference leads to conclusion that momentum simulation is saving time without having much struggles and efforts to get optimum readings. The Proposed SMD LPF has a very low insertion loss of 0.965dB with a transition region of 195 MHz which is good steepness to avoid any image frequency.

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Nilsson, Per Åke, Niklas Rorsman, Mattias Südow, Kristoffer Andersson, Hans Hjelmgren, and Herbert Zirath. "SiC MESFET with a Double Gate Recess." Materials Science Forum 527-529 (October 2006): 1227–30. http://dx.doi.org/10.4028/www.scientific.net/msf.527-529.1227.

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In order to increase the output power and drain efficiency, MESFETs in SiC have been made with a double gate recess technique. Typical device characteristics of the MESFETs are drain currents of 380mA/mm, breakdown voltages of 80V and ft/fmax of 10/25 GHz respectively. These transistors exhibit power densities of 3W/mm@3GHz in class AB operation and drain efficiencies of 60%. Packaged devices with 3 mm gate periphery of this type, with via-hole grounding, gave power densities of 1.2 W/mm@6GHz at 50 V drain bias.

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Zhang, Lihua, Tie Wang, Yadong Gu, Guodong Yang, and Chenguang Wang. "Accurate Fault Location Technology of Cable Head in Switchgear based on Phase-based CT and Zero-Sequence CT." Journal of Physics: Conference Series 2260, no. 1 (April 1, 2022): 012001. http://dx.doi.org/10.1088/1742-6596/2260/1/012001.

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Abstract The fault location technology for single-phase grounding fault of line has been mature, but there is little research on cable head in switchgear using this technology. Because the grounding line selection device cannot effectively identify and locate the single-phase grounding fault of the cable head in the switchgear, a cable head fault model is established. The synthetic zero-sequence current signal of three-phase CT and the zero-sequence current signal of zero-sequence CT are decomposed by variational mode decomposition (VMD). The grey correlation degree is then calculated to analyze the similarity of the two signals. Thus, the precise fault location technology of cable head in switchgear based on the measurement of phase CT and zero-sequence CT is proposed, and the correctness and feasibility of the proposed technology are verified by ATP simulation software.

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47

Li, Wendan. "Clause structure and grounding in Chinese written narrative discourse." Chinese Language and Discourse 5, no. 2 (November 28, 2014): 99–145. http://dx.doi.org/10.1075/cld.5.2.01li.

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This study examines the grounding functions of eight basic clause types in Chinese written narrative. It demonstrates that variations in constituent order and clause structure are a major means to designate events versus states at the clause level and ultimately a device to encode foregrounding versus backgrounding distinction. While perfective clauses in the canonical SV(O) word order typically designate major events and are signposts of foregrounding, deviations from this prototype tend to be interpreted as stative predications in the background. Variations in constituent order and clause structure even override the verb form in indicating situation types and grounding functions.

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Kou, Xiaokuo, Manling Dong, Fan Yang, Sheng Han, Ke Zhang, Lei Guo, and Guojun Ding. "DESIGN OF GROUNDING GRID CONDUCTOR POSITIONING DEVICE ON THE MAGNETIC FIELD METHOD." Progress In Electromagnetics Research M 67 (2018): 105–17. http://dx.doi.org/10.2528/pierm18020205.

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Vedeneeva, Liudmila, and Aleksandr Chudinov. "Study of influence of the main ground properties on grounding device resistivity." Вестник Пермского национального исследовательского политехнического университета. Геология. Нефтегазовое и горное дело 16, no. 1 (2017): 89–100. http://dx.doi.org/10.15593/2224-9923/2017.1.10.

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Mankov, V., S. Efremov, and V. Monashkov. "Grounding device for electrical networks and electrical installations in the Arctic regions." IOP Conference Series: Earth and Environmental Science 302 (August 6, 2019): 012066. http://dx.doi.org/10.1088/1755-1315/302/1/012066.

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Journal articles on the topic 'Grounding device'

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