ASSIGNMENT TEACHER Smt. K.VASUMATHY GROUP MEMBERS:- MANSI DWIVEDI (ET 4 TH SEM) ARTI DWIVEDI (ET 4 TH SEM) DIKSHA CHANDRAKAR (ET 4 TH SEM) MAMTA CHOUDHARY (ET 4 TH SEM) ANURABH KAR (ET 4 TH 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

# 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.

It is classified into two system :- # Service Earthing systems # Protective Earthing systems

# 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.

PURPOSE of 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.

# 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. # i t 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 of earthing # 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.

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