What are the types Auto transfer scheme?

What are the types Auto transfer scheme?
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1 Answer

Answer :

1. Fast transfer scheme to close the tie-breaker in less than 200 milli seconds. This limits transient current and voltage dip in the bus and does quick acceleration of the motors.

2. Slow transfer after 200 milli seconds.  
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Related questions

What are the conditions for Auto transfer scheme?

Description : What are the conditions for Auto transfer scheme?

Last Answer : Backup protections are not allowed to initiate the Auto transfer. Because under voltage may exist in the bus. Similarly protection in LV of the transformers are not initiating the Auto transfer scheme. There are three metrics used ... in GT. 4. Fault in 220 kV bus (SUT). 5. Fault in SUT (86M).  

Why auto transfer is prevented if the backup protection is operated?

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Last Answer : The back up protection is supposed to operate in case of a bus fault. Hence the auto transfer is prevented. 

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Last Answer : If one of the sources is tripped on main protection its breaker will be tripped and the tie-breaker will close. This transfer of supply from one source to other source is called auto transfer. To restore the class IV whenever the UT or SUT is lost Auto transfer is provided.

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Description : When auto transfer is effected? 

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Description : What parameters or technical particulars are important to be considered while designing protection scheme of the transformer?

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