In this lecture will educate the sychronism and Relays :
The Synchronism :
Founded generation units in all over the country to make the connection between the
units and run in the synchronous and reduce due to increase the loads .
in case of out the heavy loads , the generator speed increase and may be explodes .
Type of Relay :
Definite Relay :
Determine the current value and the value of delay time .
Inverse Relay :
- Inverse .
- Very inverse .
- Extremely inverse .
Inverse Relay :
- Family of curves .
- For Transmission line protection .
- T = 0.14 * TDS / (m^0.02) -1 .
Very Inverse :
- Family of curves .
- For Ring feeder protection .
- T = 13.5 * TDS / m -1 .
Extremely Inverse :
- Family of curves .
- For cable - transformer .
- T = 80 * TDS / ( m^2 ) - 1 .
In this shape , it's showing the difference between the 3 type of it :
Inverse Definite minimum Time (IDMT) :
the part one :
When the current increase in the part one the time inverse proportional with the
currrent .
in the part two :
in case of occur fault , disconnect immediately .
To continue our course of Power Protection System :
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