TRANSFOR.VERS 



19 



in each transformer? Compare the copper losses with their full- 

 load values. 



85. The following short-circuit data are given on two 500- 

 kv.-a., ll,000:2300-volt transformers: 



These transformers are connected in parallel on both the high- 

 and low-tension sides and supply a total current of 452 amperes at 

 0.95 power factor on the low-tension side. What current does 

 each transformer supply? 



86. The following short-circuit data are given on three 

 66,000 :6600-volt transformers: 



No. Kv.-a. | Type | Amperes 1 



Volts 



Watts 



These transformers are connected in parallel on both their 

 high- and low-tension sides, and supply a load of 9200 kw. at 

 a power factor of 0.93 and their rated voltage. Compare the 

 division of the total current between the transformers with their 

 ratings. 



87. The following short-circuit data are given on three 

 ll,000:460-volt transformers: 



These transformers are connected in parallel on both the high- 

 and low-tension sides, and supply a load of 754 kw. at 0.88 power 

 factor and their rated voltages. What current does each trans- 

 former supply? Compare the copper h in , ;l , h transformer 

 with the copper loss at full load. 



88. Consider the transformers, Nos. B and C, described in 



problem 86. The high-tension windings receive power from (he 



Mfflfl 66,000-v<>lt circuit, while the low-tension windings deliver 



power to independent circuit <. Each transformer delivers its 



ll-load CUM 



