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How can we calculate earth mat conductor size ..? & give the formula to determine earth conductor size?
3 Electrical Engineering 14299
how to test vector goup of Dy11 transformer
Answer
1) Connect HVside with 3 phase supply,
2) Short with a cable HV R phase & LV r-phase,
3) LV left open circuited
4) Now Switch on the 3-phase supply
5) Now Measure the following Voltage's
VRY,VYB,VRB
VRN,VYN,VBN
Vry,Vyb,Vrb
VRr,VRy,VRb
VYr,VYy,VYb
VBr,VBy,VBb
6)CHECK the following condition(These are derived from
Phasor diagram)
i) VBb
iii)VRY=VRn+VYn
iv)VYb
is OK
ALL THE BEST------Prasad
| Is This Answer Correct ? | 10 Yes | 7 No |
why there is a high voltage line in multiplication of 11?i.e.-
-66kv,11,kv,22kv
Answer
value.normally for AC current we will consider RMS VALUES
ONLY,because of this we will get 11kv,22kv,33kv...etc
| Is This Answer Correct ? | 1 Yes | 5 No |
Question { 9306 }
21. What is the purpose of taking Capacitance and Tan Delta
Test in
Transformer bushing?
22. What are the protections to be used for Generator?
23. Draw the vector diagram and condition for the
following: 1) Dyn1
2) Ynd0 3) YnYn0
24. What happens when the polarity changes in CT? Explain
briefly?
25. Explain the Term in CT Name Plate – Class: 5P10
Answer
| Is This Answer Correct ? | 5 Yes | 4 No |
i am swathi, b.tech 4th year.
In smps(switched mode power supply)we are using
diodes,mosfets,igbts for controling of current.
And my question is why we did not use thyristors(scr)? it
is also act as a switch,then what is the drawback of scr as
compared to above transisters> if we use the scr,then what
is happening ? plz give reply as soon as possible bcoz i
am doing project on smps. plz frnds i want ans for
that. if anybody know the ans plz send to my e-mail
id /swathi.tadakapally@gmail.com/
Answer
thyristor(scr) but for scr we have to design firing angle
circuit separatly,we have to check whether scr is
triggering or turning on exatctly as per our requirements
or not and for high power applications it is better to
diodes,mosfet,igbts..in these we wont face firing angle
circuit design problems...bocz for the SCR firing circuit
is the heart hope so....
| Is This Answer Correct ? | 10 Yes | 6 No |
Question { 6514 }
what is main reason for grid earthing for any industry
Answer
| Is This Answer Correct ? | 3 Yes | 2 No |
Question { 7028 }
What is the fundamental cause of transients in power system?
Answer
cinditions
| Is This Answer Correct ? | 0 Yes | 4 No |
Question { 14299 }
How can we calculate earth mat conductor size ..? & give
the formula to determine earth conductor size?
Answer
A=0.0013*I*sqrt(t),
for welded joints cross section Area of the conductr
A=0.011*I*sqrt(t),
I - Fault current (KA) = Fault MVA/ (sqrt3 * system KV)
t - Duration of time
| Is This Answer Correct ? | 3 Yes | 0 No |
Question { 7677 }
How transformer neutralshould earthed ? Transformer neutral
connected to earth mat in substations, right or wrong ?
Answer
and this neutral is conected ground seprately
| Is This Answer Correct ? | 3 Yes | 1 No |
Question { 5953 }
what do you mean by linear and bilateral network?
Answer
Excitation
Bilateral Element: what ever the direction of the currrent
response must be same
| Is This Answer Correct ? | 0 Yes | 2 No |
