Substation Testing and Commissioning

Thursday, March 30, 2017

TRANSFORMER & REACTOR STABILITY CALCULATIONS

TRANSFORMER STABILITY CALCULATION

67MVA TRANSFORMER








502 MVA TRANSFORMER 





 180MVAR REACTOR STABILITY 


1. Use the sensitive clam meter to easure the reactor current 
2. Concidor the vector group of the transformer and reactor for curculating the current 
 3. Both side star star current curculating will not happend 
4. So open any one pole of reactor CB and disable the PD to avaid the trip
5. Now the unbalance current will flow throgh the Reactor neutral. 
6. Short the NGR to make the current flow in the neutral CT. 








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THIS IS SIVA T&C ENGINEER IN NCC LTD - SAUDI.