Discussion
The positive sequence component of voltage at the point of fault becomes zero, when it is a __________.
Answer: B
The positive sequence voltage at the fault becomes zero in a three phase fault.
A bolted three phase fault is symmetrical: all three phases are short-circuited together at the fault, so every phase voltage there is zero. A balanced set of zero voltages has no negative or zero sequence part, and its positive sequence component is zero as well.
In the unsymmetrical faults this does not happen. For a line to ground, line to line or double line to ground fault, the positive sequence voltage at the fault equals the voltage drop across the negative sequence network (and, where it is involved, the zero sequence network), which is not zero.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development