Three Phase Distribution Transformer FAQ 3

21. When the load increases, the secondary current of the three phase distribution transformer will _____ (C)

A. Decrease B. No change C. Increase proportionally D. Significantly increase

22. A transformer with a capacity of 315kVA, if it carries a load of 315KVar capacity, it can also carry a power of _____ (B)

A.315kW B.157.5kW C. A small amount D.0

23. When the load increases, the efficiency of the three phase distribution transformer will _____ (A)

A. Higher B. Lower C. No change D. Not sure

24. The wiring group of the three phase distribution transformer refers to the phase relationship of the following two quantities _____ (A)

A. Primary line voltage and secondary line voltage;

B. Primary line current and secondary line current;

C. Primary phase voltage and secondary phase voltage;

D. Primary phase current and secondary phase current

25. The short-circuit voltage of the three phase distribution transformer refers to _____ (D)

A. The secondary voltage when a short circuit occurs at the primary

B. The secondary voltage when the secondary short circuit occurs

C. When the secondary short circuit occurs, the percentage value of the primary voltage drop

D. When the secondary is short-circuited, the voltage value that needs to be added on the primary side to make the secondary reach the rated current

26. When the load increases, the iron loss of the transformer will _____ (C)

A. increase B. decrease C. remain unchanged D. vary

27. When the load increases, the copper loss of the three phase distribution transformer will _____ (A)

A. increase B. decrease C. remain unchanged D. vary

28. The most important part of a transformer is _____ (D)

A. Winding and oil B. Core and oilC. Insulating porcelain bottle and terminal D. Winding and iron core

29. The basis for judging whether a transformer is overloaded is _____ (D)

A. Active power B. Reactive power C. Voltage D. Current

30. The gas relay in operation gives an alarm, indicating that the three phase distribution transformer may have the following faults _____ (C)

A. Winding temperature is too high B. Core insulation damage

C. Gas is generated inside the transformer D. Oil performance deteriorates