what use can we make of 3rd harmonic component
Answer Posted / ketul
Yy connection without neutral wires with both primary and
secondary connected in
star no closed path exists. As the triplen harmonics are
always in phase, by virtue
of the Y connection they get canceled in the line voltages.
Non-triplen harmonics
like fundamental, become rt3 times phase value and appear
in the line voltages. Line
currents remain sinusoidal except for non-triplen harmonic
currents. Flux wave in each
transformer will be flat topped and the phase voltages
remain peaked. The potential
of the neutral is no longer steady. The star point
oscillates due to the third harmonic
voltages. This is termed as ”oscillating neutral”.
Yy connection with neutral wires When a neutral wire is
provided the triplen har-
monic current can flow and the condition is similar to the
single phase case (with a star connected 4 wire source or
with the system earth).The neutral wire carries three
times the triplen harmonic current of one transformer as
these currents are co-phasal.
Unloaded secondary neutral will not be operative. In a Yy
connection, to obtain third harmonic suppression one may
provide a third
winding which is connected in mesh, which can be an
unloaded winding. It is called a
tertiary. This winding improves the single phase to earth
fault detection also. Further,
this winding can be used to feed some permanent station
loads also. Such transform-
ers are designated as Yyd transformers. If the neutral
wires are provided and also
mesh connected winding is present, then triplen harmonics
are ’shared’ between them
depending upon their impedances.
Is This Answer Correct ? | 7 Yes | 6 No |
Post New Answer View All Answers
What is magneto on a gas generator. how it functions. its out put is d.c or a.c. how it can be checked for correct functioning
What is a differential amplifier? Also, explain cmrr.
difference between high and low impedance BUS BAR relay??
Is electro plating what type of load whether resistive, inductive or capacitive loads
what is the advantage of connecting capacitors in delta than in star?
Logic using 1 kV or 1,1 kV grade in house wiring Low voltage cable. Explain/suggest? some use 1kV and some prefer 1.1kV grade insulation low voltage cable why??
How Can you do Maintenance of ACB of 2000Amperes
What is size 00, 01, 1 etc., in HRC fuse types?
WHAT HAPPENED DC SERIES MOTOR FIELD WINDING OPEN. CAN POSSIBLE.
Can we check ELCB constantly from R1 to R8 phase in 1 no DB?
Why the standard of ambient teperature mentioned as 40 degree celcius in machines.
how to calculate short circuit current for the busbar
STATE USE OF ARC RUNNERS & SPLITTERS ?
I want to ask that is there any relation between current denesity of copper and material purity. also is ther any standard which defines the standard current denesity of material.
what is the relation between reactive power and power factor for the what is the limit of reactive power and power factor