1. POWER HOUSE

2. DESIGN OF POWER HOUSE
Important considerations in design:-
safety of personal equipment.
reliability and security.
possibility to expand.
ease in maintenance.

3. 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

4. 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.

5. 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.

6. POTENTIAL TRANSFORMER (P T )
Potential transformers (PT): The lines insubstations operate at high voltages. The
measuring instruments are designed for low value of voltages. Potential transformers
are connected in lines to supply measuring instruments and protective relays. These
transformers make the low voltage instruments suitable for measurement of high
voltages. For example a 220 kV/110V PT is connected to a power line and the line voltage
is 220 kV then the secondary voltage will be 110V.
Voltage transformers are used to step down the voltage for measurement, protection
and control. Voltage transformers are of two types.
1 Electromagnetic type
2 Capacitive VT located on the feeder side of the Circuit Breaker.
Potential transformers

7. 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.

8. TRANSFORMER

9. 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

10. THANK YOU…..