what use can we make of 3rd harmonic component
- 5 Answers
- 11748 Views
- Bhel, General Motors GM, I also Faced
- E-Mail Answers
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 distance between electrical panel to land ?
Swg formulae
Dear sir, my knowledge about cable size determination is limited. Though I read examples I could not calculate the Cable size required for electric driven pump 40 KW, 380 Volt, 50 HZ, 50 meter from transformer and it is three phase star delta starting. Please help as there is no one in my surroundings to help.
thyristor controlled APFC panel design parameter?
What is electrical grounding?
How halogen & merquery lamp works.
how slip power recovery system work
on a three-winding transformer relationship delta-delta-star, on third winding why the relationship is a star? what are the advantages and disadvantages? Thank you and please help
What is the numerical quantity of sqcm?
What is rotating magnetic field?Discuss elaborately.
what are the effects when a salient pole alternator is run at high speed like 3000 r.p.m?
How to confirm the Phase shifting Transformer VECTOR GROUP relation , as below ZNy11.45d10.45-ZNYy0.15d11.15
witch pump used in wtp
what is the function of impulse relay
What is the formula for calculating no-load current?
