Connecting Generators in Parallel for Hydro-power Plant

AI Thread Summary
In a hydro-power plant with two 11KV generators, there is a debate on whether to connect each generator separately to the 132KV transmission line or to first synchronize them in parallel at the 11KV bus bar. Connecting them separately may enhance line protection schemes, while paralleling could facilitate local 11KV supply. If local supply is needed, a third 132KV/11KV transformer could be considered, but tapping directly from the 11KV bus is also an option. Transformers can operate bi-directionally, allowing power to be drawn from the 132KV side if one generator fails. The choice ultimately depends on the specific operational requirements and protection strategies of the plant.
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Suppose in a hyro-power plant, there are two generators, G1 and G2 of 11KV output voltage.
The Transmission Voltage is 132KV. There are 2 11 Kv/132 Kv transformers.
So, should we connect each generator separately to the Transmission line and synchronize individually OR should we first connect both generators in parallel (at 11 KV bus bar) and synchronize them before connecting to the grid.
Whats better?
 
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I'm thinking the former in order to do line protection schemes.
 
I was also thinking like that.
But If You also need to have Local 11 KV supply, then do you use a third 132KV/11KV transformer Or Would You directly tap-off from 11 KV Bus by paralleling two generators ?
 
Remember that transformers work in both directions. When one unit is down, power could be taken from the 132KV side.
 

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