What is negative phase sequence?
Answer Posted / adil yousuf
Ans ; The negative phase sequence
current will flow due to diffence of three phase volages of
the system.If no difference of R Y B voltage is present,
the negative sequence current will not flow.
In rotating machines an unbalance voltage or current in one
phase winding due to elctrical faults or uneven load
further exacerbates the problem. The magnetic coupling
between the winding becomes uneven.
when subject to unbalance conditions, negative phase
sequence currents produce a counter rotating megnatic field
withrespect to the main field.
The resultant field rotates at double frequency and causes
underirable eddy-currents to flow in various structure such
as the machine rotor body , excitaation winding, stator end
winding and stator iron etc.
Is This Answer Correct ? | 54 Yes | 8 No |
Post New Answer View All Answers
If anyone would like to know or practice for FEWA papers contact me on mohamedrashad2@hotmail.com Just completed the supervisor exam in April 2021
what is the voltage between earth to neutral in lift.
sir& friends i want the collection of recent quetions asked in interview of top most companies please send me on my email san.jsr@hotmail.com
What is the transfer function?
what is meant by directional earth fault and non directional earth fault? describe both.
why capacitance effect is predominant in underground cable transmission and inductance effect is predominant in over head line transmission?
how to estimate wiring ins roughing ins. and boxes
i am completed diploma in ece,and working in ht and lt lines.so is elligible diploma in ece for get electrical C Licence?plse give ur opinion?
What would cause a 240v choke that should give 110v out on a 16w lamp to gradually increase to 160v?
What is the armature mmf in a D.C machine?
which network topology offers the greatest level of tolerance?
how does grading rings & spacers in transmission line works? Working Principle?
what r the safety measures in UPS ? explain all?
Can anyone please give me the parameters , formula needed to calculate the circuit breakers for building services.Thanks
The capacitive reactance of a capacitor of 1/(2(PI)) F at 10^3 H is