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Importance OF Earthing And Grounding

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This Presentation was forwarded By Harish Sharma. Managing Director OF BDS Consultant. The Topic highlights Importance Of Earthing And Grounding in the construction industry.

Mr Sharma elaborated how BDS is involved in Planning & Designing of Electrical Design Consultancy Services in the construction industry.

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Importance OF Earthing And Grounding

  1. 1. PRATHAM “BDS Consultants” Harsih Sharma MEET NUMBER SEVEN On 5TH June 2018 at c/o The Entrepreneurship School, O-113, Arjun Market, Block E, DLF Phase 1, Sector 26A, Gururgram, Haryana 122002
  2. 2. M/SBDSCONSULTANTS (ELECTRICAL CONSULTANCY SERVICES) ADDRESS : I-149D, FIRST FLOOR, LAXMI NAGAR, NEW DELHI-110092 Website: www.bdsconsultants.co.in Email: bdsconsultants17@gmail.com Tel / Mob: 011-22504149, +91-9999762536 GST-IN: 07BQTPS8533G1Z4 PAN NO: BQTPS8533G
  3. 3. ABOUT COMPANY: BDS involved in Planning & Designing of Electrical Design Consultancy Services . The company is established in the year of 2015 has specialized skills, man power & expertise in planning & designing of various kinds of prestigious projects like Residential Towers & Townships, Commercial High Rise Buildings, Offices, IT Campuses, Data Centers, Malls & Call Centre buildings, Multispecialty Hospitals, Universities & Campuses, Hotels, Underground Metro Stations, Industrial Plants or Factories & Interior fit outs etc. in accordance with National & International Codes & Standards. 1. Electrical Power Distribution System Design. 2. Fire Alarm & Detection System Design. 3. Public Addressable System Design. 4. Access Control System Design. 5. CCTV & Security System Design. 6. Energy Audits, Electrical Audits & Safety Audits. 7. Electrical Power System Analysis using ETAP-16.1 Software. ELECTRICAL CONSULTANCY SERVICES OFFERED:
  4. 4. OUR EXPERTISE : 1. Feasibility Study at Site & Due Diligence. 2. Preparation of Conceptual Designs according to Project for approvals from Architects / Clients. 3. Preparation of Detailed Designs after approval from the Architects / Clients. 4. Preparation of Design Brief Reports. 5. Preparation of Tender Drawings, BOQ’s, Cost Estimates, Technical Specifications, List of Approved Makes etc. 6. Assistance in award of work & contract agreement documentations. 6. Periodical Site Visits / Inspection of Contractor’s Work. 7. Checking of bills of contractors and giving necessary instructions during the period of constructions.
  5. 5. 1. Estimation of Electrical Load. 2. Sizing & Selection of Electrical Equipment's. 3. Electrical Sub-Station Designing up to 33 kV Grade. 4. High Tension & Low Tension Power Distribution System. 5. HT / LT Power Cable Sizing & Selection, Voltage Drop Calculations as per Design & Engineering Practice. 6. Internal & External Electrification Works. 7. Development of Single Line Diagram (SLD) for Power Distribution Network & Protection Schemes. 8. Internal / External Lighting System Design using DIALux Software. 9. Earthing & Lightning Protection System Designs etc. SERVICES OFFERED IN DESIGNING: A. ELECTRICAL SYSTEM:
  6. 6. GROUNDING OR EARTHING INTRODUCTION: Grounding is one of the essential components of any electrical system. It plays a very important role as far as the safety of the electrical equipment and also of human beings is concerned. TYPES OF GROUNDING: 1. System Earthing or Grounding. 2. Equipment Earthing or Grounding.
  7. 7. SYSTEM GROUNDING: GROUNDING OR EARTHING In a three-phase power system, the system earthing is earthing of neutral of the equipment connected in a system like grounding of neutral of transformer or generator.
  8. 8. SYSTEM GROUNDING: GROUNDING OR EARTHING In a three-phase power system, the system earthing is earthing of neutral of the equipment connected in a system like grounding of neutral of transformer or generator. ADVANTAGES:  The over voltage is suppressed and the insulation of the equipment are not subjected to high voltage resulting in the increased life of the equipment.  The protective relaying system can be deployed to clear the earth fault fast and selectively.  The system becomes safe.  In case of ground fault, high ground current can be prevented to flow through the ground by providing resistive earthing. This results in prevention of damage of equipment due to burning of the faulted point.
  9. 9. TYPES OF SYSTEM GROUNDING: GROUNDING OR EARTHING 1. Solid Grounding. 2. Resistance Grounding. 3. Reactance Earthing. SOLID GROUNDING: The low voltage system is solidly earthed, since high ground fault current is required to operate the protective devices. If the source of power supply is transformer only, then ground fault current may be equal to the three phase fault current. However, If power source is generator then the ground fault current should less than the three phase fault current to prevent damage of the slot and slot winding resistance where the fault has taken place.
  10. 10. GROUNDING OR EARTHING RESISTANCE GROUNDING: In medium voltage system, resistance earthing method is adopted since the ground fault current is large and rotating equipment like alternator may get damaged. In high & medium voltage system, where neutral is grounded by low resistance to limit the ground fault current, ground fault protection is done by providing a zero sequence current transformer in the neutral. REACTANCE GROUNDING: Reactance Grounding is done by connecting a reactor between neutral and the ground. The Purpose is to limit the ground fault current. It is used where the DG neutral is connected to earth. The reactor is added in the generator neutral to limit the ground fault current to a value less than the three-phase fault current.
  11. 11. GROUNDING OR EARTHING SYSTEM GROUNDING POINTS: Grounding shall be done at each voltage level. The neutral point available at transformer, generator shall be earthed. Grounding should be done always at source end. It is not advisable to ground the neutral at load end. The reason is that, If grounding is done at load end, it is difficult to ensure that the load will always remain connected. If the load is not in service, then the grounding will also be disconnected.
  12. 12. GROUNDING OR EARTHING EQUIPMENT EARTHING: The basic purpose of equipment earthing is human safety, by preventing the rise of potential to any dangerous level, which is unsafe and can cause shock to any human being when accidentally he may come in contact of the metallic enclosure of a live conductor. TYPES OF ELECTRODES: 1. GI Plate. 2. GI Pipe. 3. Copper Plate. 4. Strip / Conductor
  13. 13. GROUNDING OR EARTHING SELECTION OF TYPE OF ELECTRODES:
  14. 14. GROUNDING OR EARTHING Min. Number Of Electrodes Required:
  15. 15. GROUNDING OR EARTHING LOCATION OF EARTH ELECTRODES: 1. Normally an Earth Electrode shall not be located closer than 1.5 mtr. From any building. 2. The distance between two or more electrodes (Plate / Pipe) shall not be less than 2 mtr. 3. The Strip or conductor electrode shall be buried in trench not less than 0.5 mtr. deep. EARTH RESISTANCE: The earth resistance at each electrode shall be measured. No earth electrode shall have resistance greater than 5 ohms as measured by an approved earth testing apparatus. In rocky soil, the resistance may be up to 8 ohms. IS 3043-1987, does not specify any formula for calculating the total resistance of earth grid, it just says that the total resistance will be inversely proportional to the number of earth electrodes. IMPORTANT NOTE:
  16. 16. THANKS
  17. 17. THANKS For any Project Management and Engineering Consultancy Connect us at +91-120-4356006 or info@manomav.com. We are specialized in Latest Construction Monitoring Technologies, Building Information Modeling (BIM), Quantity Surveying (QS), Bar Bending Schedule (BBS), Cost; Quality; & Scheduling Audits, Material Management Software, 3D Walkthroughs, Training on Primavera/MS Project, and Home Inspection (Icons designed by AlfredoCreates.com)

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