【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
A. Single phsae ground short circuit B. Three phase short circuit C. Two phase short circuit D. Two phase ground short circuit
举一反三
- short circuit
- The resistance value is infinite, the current passing through the resistance is always zero, and the voltage depends on the external circuit, then it is called as the short circuit state.
- The value of drain current is always （ ） the value of the short circuit drain current IDSS for a given JFET.
- When two two-terminal networks are equivalent, they are equivalent to ( ). A: external circuit B: internal circuit C: external circuit and internal circuit D: neither external circuit nor internal circuit
- Please answer this question. A: Short circuit protection B: Overload protection. C: Under voltage protection. D: Thermal relays protection.