Earthing System Calculation Ĥ Bazian Steal Factory S/S 132/11kV, 1x30/40 MVA 2. The result shows that the touch and step voltages are within the permissible limits. Canada whose results are shown in Appendices. The calculation is done using the software CDEG MultiGround TM SES - Safe Engineering Services & technologies ltd. The earthing system is designed so that the allowable touch and step voltages do not be exceeded. Specific resistance is calculated on the basis of measured values of soil resistivity.
Introduction Bazian Steal Factory S/S 132/11kV, 1x30/40 MVA The project of earthing system is prepared in accordance with the requirements of the investor and Standard: IEEE Guide for Safety in Substation Grounding. Introduction List of references and symbols List of references List of symbols Soil resistivity measurements Earthing Calculation Details to IEEE Std Grid Conductor Sizing Calculation od current flowing between ground grid and earth Tolerable Step and Touch Voltages Reduction Factor Due to Resistivity of Crush Rock Surface Touch and Step Voltage Criteria Principal results of the CDEGS software calculations Resistance of Electrode System (See Appendix 7) Maximaum value od Grand Potential Rise GPR (See Appendices 7 and 15) Touch voltage (See Appendix 8) Step Voltage (See Appendix 8) Appendices Earthing System Calculation ģ 1. Daud Ahmad | Dr.1 BAZIAN STEAL FACTORY S/S 132/11kV, 1x30/40MVA EARTHING SYSTEM CALCULATION Kurdistan Region Sulaimani May 2011Ģ Bazian Steal Factory S/S 132/11kV, 1x30/40 MVA Contents: 1. The data used in design considered from a substation in Mumbai, Maharashtra. Result of manual calculation compared with design simulated through ETAP software version 19. This paper also discussed constraint in design due to below ground level. The basic purpose of earthing is to ensure personnel safety, safe and reliable operation of equipment’s, prevent stray current, protection against interferences and keeps steps and touch potential within safe limit. Earthing is essential for proper functioning of substation equipment’s and in the absence of proper designing affects in many ways like electric shock to personnel’s and malfunctions and damage to the equipment’s. Fault current level of the system considered as 70kA derived from calculations. The main considerable factors for earth mat design are soil resistivity which is higher due to basalt rock and system fault current. The earth mat is below substation which is almost 15 18 Meter deep from ground level.
in this type of substation equipment’s are 33kV HV panel, transformer, battery, battery charger and Low voltage panels. This paper describes the earthing design of a distribution substation 33kV 415V, 50Hz system.
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