Download telecom earthing - BSNL Durg SSA(Connecting India)

ASSIGNMENT TEACHER
Smt. K.VASUMATHY
GROUP MEMBERS: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
# 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.
# 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 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.