178 



COMMERCIAL ELECTRICAL TESTING 



the proper deflection on the voltmeter, then transfer 

 the voltmeter lines to the secondary, connecting the line 

 that was on No. 1 primary to No. 1 secondary, and the 

 line that was on No. 2 primary to No. 2 secondary. 

 Now break the primary current and if the polarity for 

 this phase is correct, a positive kick will be obtained. 



Tension Delta 



to* Tension Oe/ta 

 Three 5/ng/e -phase Transformer* 



Fig. 53 



High Ten s/on De/t a 



High Tens/on Delta 



J-/WWV-* pAA/WV-| U/WW\r| Primary 



Seconder/ 



rwwy\n n/ywy\n rwwyvi 



/ 25 45 6 



Low Tens/on O<om 

 Low Tension Diom Jhroo -phase AOH Transformer* 



Trree 5/ng/e -phase Transformers 



Fig. 54 



rt,gh Tension-C&t&e ^ / 



Fig. 57 



High Tension 



Low Tension )e/t.o 

 q/e -phase Tronsforrners 



Fig. 55 



High Tension Delta 

 ^-MVWj kwWVi 



Low Ten sion De /~L<3 

 -phase ABT Transformers 



Fig. 56 



Low Tension Delta 

 Three -phase A Q T Transformer* 



Low Tension De/ta 

 ree phase HT \Tronsf or rr,er 3 



Fig. 59 



Connections for Polarity on Three-phase Transformers 



