An<br/>abbreviation is a ( ) form of a word or phrase used chiefly in<br/>writing to represent the complete form A: long B: shorted C: shortened D: longer

For 3-winding transformers, when we do the short circuit test, we can measure from winding 3, with winding 1 shorted and winding 2 open, then can get leakage impedance Z13 value. ( <br/>)

【单选题】The types of short-circuit in three-phase system are three-phase short-circuit, two-phase short-circuit, two-phase short-circuit grounding and single-phase short-circuit grounding. When the three phases of the system are short-circuited, they are still in the symmetrical stated. Other types of shorted circuit are asymmetric short circuit. Which of the following types is a symmetrical short circuit? A. Single phsae ground short circuit B. Three phase short circuit C. Two phase short circuit D. Two phase ground short circuit