Question

Explain how two electrical substations of different voltage are connected

Answer 1

INTERCONNECTION OF TWO DIFFERENT VOLTAGE LEVEL IN SUBSTATION.

• FOR SYNCHRONISATION OF TWO POWER SYSTEM THREE PARAMETERS HAS TO BE MATCHED. 1)VOLTAGE 2)FREQUENCY 3)PHASE SEQUENCY
• FOR MATCHING THE VOLTAGE LEVEL,WE HAVE TO CHOOSE WHICH VOLTAGE LEVEL TO BE USED FURTHER IN SUBSTATION.AFTER CHOOSING THE SUBSTATION VOLTAGE WE CAN CONVERT THE VOLTAGE OF OTHER SYSTEM TO REQUIRED VOLTAGE LEVEL BY USING SUITABLE TRANSFORMER.
• NORMALLY THE FREQUENCY OF ALL GENERATING SYSTEM IS MAINTAIN CINSTANT. IF IT IS NOT SO THN WE CAN CONVERT THE POWER SYSTEM TO REQUIRED FREQUENCY SYSTEM BY USING FREQUENCY CONVERTERS OR CYCLO-CONVERTRS.
• THE MAIN SYNCHRONISATION IS THE PHASE SEQUENCE.IT CAN BE DETERMINED BY 1)TWO BULB BRIGHT AND ONE DARK TEST 2)SYNCHROSCOPE
• IN THE MODERN POWER SYSTEM WE ARE USING SYNCHROSCOPE FOR PHASE SYNCHRONISATION.
• BENIFITS FOR SYNCHRONISATIONS ARE   

1)WHEN THERE IS ANY MAINTENANCE OF ANY ONE TRANSFORMER THERE WILL BE CONTINOUS POWER SUPPLY IN THE BUSBAR

2)LOAD SUPPLY CAN BE INCREASED ACCORDING TO THE RATING OF THE TRANSFORMERS.

3)WHEN THERE IS LOW POWER DEMAND ONE TRANSFORMER CAN BE SHOTDOWN .

4)THE RELIABILITY OF THE SYSTEM WILL INCREASE.

5)LOAD SHARING IS EASY ACCORDING TO THE GENERATION PLANT REQUIRMENT.