TELECOM EARTHING ASSIGNMENT TEACHER Smt. K.VASUMATHY GROUPMEMBERS:- MANSI DWIVEDI (ET 4TH SEM) ARTI DWIVEDI (ET 4TH SEM) DIKSHA CHANDRAKAR (ET 4TH SEM) MAMTA CHOUDHARY (ET 4TH SEM) ANURABH KAR (ET 4TH SEM)
TELECOM EARTHING TOPICS # INTRODUCTION # CLASSES & PRINCIPLE OF TELECOM EARTHING # PURPOSE & REQUIREMENTS OF TELECOM EARTHING # EARTH ELECTRODE & ITS TYPES # COMPONENTS OF EARTHING # LIMITATIONS OF TELECOM EARTHING
INTRODUCTION #Earthing is a necessary measure of protection from hazardous electric currents which may result either due to power induction, lighting or short circuits. # The electric charges could be reduced by connecting charged body to the earth through an electrode. #earthing is used for protection at every point of supply network from generator to the electrical apparatus using by the consumer.
CLASSES of Earthing system It is classified into two system :- # Service Earthing systems # Protective Earthing systems
PRINCIPLE of Earthing system #Satisfied current carrying capability(AC or DC). # Satisfied mechanical strength to continue the service without fracturing. # Satisfied sudden powerful current carrying ability in case of lightning.
PURPOSEof Earthing # To reduce external interference of noise. # To protect buildings & other equipments from lightning strikes. # To protect persons from leakage of currents. # It helps us to provide stability of voltage conditions in excess fluctuations.
REQUIREMENTS for SERVICE EARTHING SYSTEMS #Service-Earthing system should have low D.C. resistance in order to ensure that the potential drop across the earth connection should be low. # If current flows through through the station a potential difference is developed across the earth station. # This introduces an electrical noise in the circuit. # The value of resistance depend upon the purpose for which the earth is likely to be carried by the station. # Administrator usually uses resisitance not more than 10 ohms.
REQUIREMENTS for PROTECTIVE EARTHING SYSTEM #Earth , which protect against excessive current must have low resistance in order to carry the over current without overheating & burning. # It should able to withstand in corrosive action of soil. # Enable sufficent current to flow through the ground so current protective devices will operate to disconnect the current after a very short time.
ADVANTAGES OF TELECOM EARTHING # Earthing prevents from lightning & short circuits. # Earthing protects consumers at every point of supply network from generator to electrical apparatus. # it conducts both AC & DC currents.
WHAT IS GROUNDING? “ A Conducting connection whether intentional or not, between electric circuits or equipments & the Earth or some conducting body that serves in place of Earth.”
Important points for grounding Important points are:- * Ground resistance should be below 1 ohm. * A Star confugration should be implemented. * Ground loops should be avoid. * There should be potential equalization.
COMPONENTS of TELECOMMUNICATION EARTHING # Telecom Bonding Conductor(TBC). # Telecom Main Grounding Busbar(TMGB). # Telecom Bonding Backbone(TBB). # Telecom Grounding Busbar(TGB). # Telecom Bonding Backbone Interconnecting Bonding Conductor(TBBIBC).
WHAT IS EARTH ELECTRODE ? # A Metal plate ,Water pipe or other conductor of electricity partially buried in the earth so as to constitute & provide a reliable conducting path to the ground. They are of 4 types:- # ROD Electrode # PLATE electrode# STRIP electrode # RING electrode
Limitations ofearthing # Chemical treatment of Earth using salts etc. are not recommended. # Earthing conductors should not pass through any metallic conduct or pipe. # All the joints of the similar metals should be water proof. # There should be no sharp bends along the entire length of the earth conductors.