NECS’s GROUP OF INSTITUTIONS
Electronics & communication Engineering,
2. CIRCUIT BREAKER
3. PROTECTIVE RELAY
4. LIGHTING ARRESTERS
5. BUS BAR
7. CONTROL ROOM
• An electrical substation is a subsidiary
station of a transmission and distribution
system where voltage is transformed from high
to low using transformers.
• Electric power may flow through several
substations between generating plant and
consumer, and may be changed in voltage in
It is an automatically-operated electrical
It operates both on “ON LOAD” and “NO
The protective relay ensures the safety of
the circuit equipments from any damage
which might otherwise cause by fault.
It is connected between the line and earth so
diverts the incoming high voltage wave to
Lightning arresters act as safety valves
designed to discharge electric surges
resulting from lightning strokes, switching
or other disturbance .
Lightning arrestors directly connected at
one end to the transmission system.
Bus-bars are merely convenient means of
connecting switches and other equipment
into various arrangements.
THERE ARE TWO TYPES OF BUS :-
2. Transfer bus
A switch is used in an electric circuit as a
device for making or breaking the electric
circuit in a convenient way
The control room is nerve center of a power
The various controls performed from here
are voltage adjustment, load control,
emergency tripping of turbines etc.
A transformer is a device that
transfers electrical energy from one
circuit to another through inductively
coupled conductors-the transformer's
A transformer is a static device which
transfers a . c. electrical power from one
circuit to the other at the same frequency
but the voltage level is changed
Power Line Carrier Communication, is an
approach to utilize the existing power lines
for the transmission of information.
The communication device used for the
communication over the power lines is a MODEM,
commonly known as Power Line MODEM (PLM).
It works as both transmitter and receiver, i.e., it
transmits and receives data over the power lines
It collects three primary types of data .
1.the status of process devices (digital inputs)
2. measures process variables (analog inputs)
3.accumulators (pulse inputs).
RTU database can be downloaded on
operator request, from a PC using the
The software package delivered with S900
RTU allows to handle both digital and