Grounding Grid Performance of Substation in Two Layer Soil - A Parametric Analysis

Unde, M. G.; Kushare, B. E.

doi:10.7323/ijeset/v1_i2_8

Cited by 17 publications

(14 citation statements)

References 15 publications

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“…The ground grid system is already laid and functioning therefore existing data is collected to analyze whether all important parameters are within the described limits [5,6].…”

Section: Overview Of Practical Datamentioning

confidence: 99%

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Design analysis and optimization of ground grid mesh of extra high voltage substation using an intelligent software

Aslam

Cheema

et al. 2014

2014 the 1st International Conference on Information Technology, Computer, and Electrical Engineering

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The 500KV substations are important for power system in Pakistan. They cover large area meeting the power requirement of whole power system. The ground grid system of substation has to be carefully analyzed in order to protect the grid, keep the system functional. A practical 500KV substation is chosen for this purpose i.e. RA WAT Grid Station. The grounding system of substation is studied in detail along with practical data collection for the purpose of analysis. It is important to mention about latest IEEE 81 2013 methods which have been adopted during data collection phase. The ETAP software version 12 is used for modeling and analysis of network. The Ground Grid System (GGS) module included in latest version of ETAP i.e. ETAP 12 is used for analysis. Firstly modeling is done in ETAP-12, afterwards analysis is performed on actual ground mesh using IEEE 80-2000 improved methods to evaluate step potential, ground potential rise, ground resistance, short term temperature rise of conductors Irods & touch potential. The shortcomings in existing grid mesh are highlighted and remedial actions are suggested to rectify the problems. The extension is planned in the substation regarding installation of new power transformer which will result to in rise of overall substation fault level. The increase in fault level is considered in one case study and possiblesolution is provided. A new ground mesh is also designed for this area which will serve as a model for future substations which will be designed in this particular area keeping in view essential parameters. A new ground mesh is also designed for 750KV substation, as it will be part of our national grid in near future as feasibility study is ongoing in NTDC Pakistan for the establishment of first 750KV substation in this area. The variation in ground grid resistance and various safety parameters with the change in ground grid mesh shape, depth and size is explained by the help of results obtained through Case studies.

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“…The ground grid system is already laid and functioning therefore existing data is collected to analyze whether all important parameters are within the described limits [5,6].…”

Section: Overview Of Practical Datamentioning

confidence: 99%

“…It is necessary to have low resistance path for the dissipation of current. Therefore a low resistance ground grid mesh is installed to protect the equipment from damage [5,6]. In case of higher resistance, more voltage drop will occur in mesh ultimately resulting in rise of mesh potentials.…”

Section: Introductionmentioning

confidence: 99%

Design analysis and optimization of ground grid mesh of extra high voltage substation using an intelligent software

Aslam

Cheema

et al. 2014

2014 the 1st International Conference on Information Technology, Computer, and Electrical Engineering

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“…Dalam kenyataan, resistivitas tanah bervariasi, sehingga dibutuhkan data yang cukup untuk kondisi tanah yang digunakan. Penentuan resistivitas tanah dapat berpedoman pada kondisi [36]- [39], dengan (a) tanah dapat diklasifikasi dalam jenis tanah seragam, apabila perbedaan antara dua nilai pengetesan terbaik dan terburuk tidak lebih dari 30% dan (b) pada model tanah 2 (dua) lapis dan grid pembumian berada pada lapisan atas, nilai resistivitas tanah lapisan atas (r surface ) dapat digunakan untuk penyederhanaan persamaan, sedangkan apabila lapisan atas lebih resistif pada perencanaan dengan model tanah seragam, maka tegangan langkah dan sentuh lebih besar dibanding perencanaan dengan model tanah 2 (dua) lapis [36]- [39]. Untuk pengurangan aliran arus melalui tubuh seseorang, lapisan permukaan dapat di tambah batu kerikil, karena lapisan batu kerikil dengan resistans jenis berkisar antara 1000-5000 .m [36]- [39].…”

Section: Parameter-parameter Kritisunclassified

Tinjauan Teoritis pada Pelaksanaan Prosedur Konstruksi Sistem Pembumian Model Grid di Gardu Induk

Goeritno

2018

JIS

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Graphical abstract mulai Data Lapangan: Aground ; rground Ukuran Konduktor: 3I0 ; ttrouble ; d Tegangan Sentuh dan Langkah: Etouch60 ; Estep60 Parameter Konduktor: D ; N ; Ltot. ; H Data Resistans Grid: Rground ; Lcond. ; lrod Perubahan Parameter Konduktor: D ; N ; Ltot. A B C D Apakah: I . Rground < Etouch? Apakah: Emesh < Etouch? Penggunaan Sejumlah Persamaan Bersesuaian, kemudian dihitung: Emesh ; Estep ; Kmesh ; Kstep ; Ki ; Kii ; Kh Apakah: Estep < Etouch? Hasil Proses Prosedur Pelaksanaan selesai ya ya ya tidak tidak tidak A B C Penggunaan Sejumlah Persamaan Bersesuaian, kemudian dihitung: Igrid, maks. ; tf D Abstract A theoretical review into implementation of construction procedure for the grounding grid system at substation has been done. The construction procedure based on a number of International standards, through a number of objectives in the form of (a) determination of conductor and connection selection; (b) determination of soil conditions; (c) calculating the value of earth resistance in the ground system; (d) maximum grid current calculation; and (e) calculation of mesh voltages and steps, and (f) flow chart of construction implementation procedures. The selection of conductors and connections, including (i) material and the size of the conductor and (ii) the connections. Determination of soil conditions, including structure, resistivity, and soil model. Calculation of the earth resistance value in the grounding grid system is based on the number of layers soil and soil uniformity. Maximum grid current calculation, including (i) determination of the location and type of worst disturbance, (ii) calculation of the noise current dividing factor, (iii) the calculation of the descending factor, (iv) the determination of the projection correction factor. Mesh and step voltage calculations include (i) mesh voltage and (ii) step voltage, (iii) limits for mesh and step voltage, and (iv) minimum length of embedded conductor. The flowchart of the implementation of construction procedure for the grounding grids system at substation is a sequence of criteria that must be met for the acquisition of an efficient security system, but safe for humans according to IEEE standards Abstrak Telah dilakukan tinjauan teoritis pelaksanaan untuk perolehan prosedur konstruksi terhadap sistem pembumian model grid di gardu induk. Prosedur konstruksi didasarkan kepada sejumlah standar Internasional, melalui sejumlah tujuan berupa (a) penetapan pemilihan konduktor dan sambungan; (b) penentuan kondisi tanah; (c) perhitungan nilai resistans bumi pada sistem pembumian; (d) perhitungan arus grid maksimum; dan (e) perhitungan tegangan mesh dan langkah, dan (f) diagram alir prosedur pelaksanaan konstruksi. Pemilihan konduktor dan sambungan, meliputi (i) material dan ukuran konduktor dan (ii) sambungan. Penentuan kondisi tanah, meliputi struktur, resis...

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“…The main advantage of this method is selecting the size of the model such as distance of earth under consideration is starting from the grounding grid. Since analysis of each potential in the soil for a selected point is considered from grounding grid to the point [5].…”

Section: Finite Element Methodsmentioning

confidence: 99%

A Comparison of Ground Grid Mesh Design and Optimization for 500kv substation using IEEE 80-2000 and Finite Element Methods

Cheema¹,

Cheema²,

Bashir³

et al. 2015

ELELIJ

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Grounding Grid Performance of Substation in Two Layer Soil - A Parametric Analysis

Cited by 17 publications

References 15 publications

Design analysis and optimization of ground grid mesh of extra high voltage substation using an intelligent software

Design analysis and optimization of ground grid mesh of extra high voltage substation using an intelligent software

Tinjauan Teoritis pada Pelaksanaan Prosedur Konstruksi Sistem Pembumian Model Grid di Gardu Induk

A Comparison of Ground Grid Mesh Design and Optimization for 500kv substation using IEEE 80-2000 and Finite Element Methods

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