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When all the three phases are short circuited it gives rise to
  • a)
    asymmetrical fault current
  • b)
    symmetrical fault current
  • c)
    zero fault current
  • d)
    both (a) and (b)
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
When all the three phases are short circuited it gives rise toa)asymme...
A three-phase fault is a symmetrical fault.
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When all the three phases are short circuited it gives rise toa)asymme...

Short Circuit in Three Phases

When all three phases are short-circuited in a power system, it results in a symmetrical fault current. Let's break down the explanation into key points:

Symmetrical Fault Current

- A symmetrical fault current occurs when the fault impedance in all three phases is equal. This leads to a balanced flow of current through the fault.
- In a symmetrical fault, the positive, negative, and zero sequence components of the fault current are equal in magnitude and phase.
- Symmetrical faults are the most common type of faults in power systems and are used for fault analysis and protection coordination.
- The behavior of a symmetrical fault current can be easily analyzed using symmetrical components theory.

Therefore, when all three phases are short-circuited in a power system, it results in a symmetrical fault current where the fault impedance in all phases is equal, leading to a balanced flow of current through the fault.
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When all the three phases are short circuited it gives rise toa)asymmetrical fault currentb)symmetrical fault currentc)zero fault currentd)both (a) and (b)Correct answer is option 'B'. Can you explain this answer?
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