POWER HOUSE. Important considerations in design:- safety of personal equipment. reliability and...
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Transcript of POWER HOUSE. Important considerations in design:- safety of personal equipment. reliability and...
POWER HOUSE
Important considerations in design:-
safety of personal equipment.
reliability and security.
possibility to expand.
ease in maintenance.
DESIGN OF POWER HOUSE
COMPONETS OF POWER HOUSE:
SURGE ARRESTORS OR LIGHTARRESTER
CURRENT TRANSFORMER (C T )
CIRCUIT BREAKER
POTENTIAL TRANSFORMER (P T )
POWER TRANSFORMER
RELAY
WAVE TRAP
BUS BAR
ISOLATER
SURGE ARRESTORS OR LIGHTARRESTER:NING
Surge Arresters or Lightning Arresters
discharge the over voltage surges to
earth and protect the equipment
insulation from switching surges and
lightning surges.
Surge arresters are generally connected
between phase conductor and ground.
In a Substation surge arrester is located
at the starting of the substation as seen
from incoming transmission lines and is
the first equipment of the substation.
Surge arresters are also provided near the
transformer terminals phase to ground.
CURRENT TRANSFORMER (C T )
Current transformers (CT): The
lines in substations carry currents in
the order of thousands of amperes.
The measuring instruments are
designed for low value of currents
Current transformers are connected in
lines to supply measuring instruments
and protective relays. For example a
100/1A CT is connected in a line
carrying 100A, and then the
secondary current of CT is 1A.
Current transformers are used for
Stepping down current for
measurement, protection and control.
POTENTIAL TRANSFORMER (P T )Potential transformers (PT): The lines
insubstations operate at high voltages. Themeasuring instruments are designed for low value of voltages. Potential transformersare connected in lines to supply measuring instruments and protective relays. Thesetransformers make the low voltage instruments suitable for measurement of highvoltages. For example a 220 kV/110V PT is connected to a power line and the line voltageis 220 kV then the secondary voltage will be 110V.
Voltage transformers are used to step down the voltage for measurement, protectionand control. Voltage transformers are of two types.1 Electromagnetic type2 Capacitive VT located on the feeder side of the Circuit Breaker.
Potential transformers
POWER TRANSFORMER
Power Transformers are used to step up or step – down a.c. voltages and to transfer electrical power from one voltage level to another. Tap changers are used for voltage control.
Transformers range in size from thumbnail-sized units hidden in microphones to units weighing hundreds of tons used in the power grid.
A wide range of transformer designs are used in electronic and electric power applications.
TRANSFORMER
PROTECTION OF POWER TRANSFORMER USING BUCHHOLZ RELAY
In the field of electric power distribution
and transmission, a Buchholz relay is a
safety device mounted on some oil-filled
power transformers and reactors,
equipped with an external overhead oil
reservoir called a conservator.
The Buchholz Relay is used as a
protective device sensitive to the effects
of dielectric failure inside the equipment
THANK YOU…..