How to measure corona loss in a transmission line?(Plz ans
only if u know the exact answer)
- 3 Answers
- 8885 Views
- I also Faced
- E-Mail Answers
Answer Posted / roysayan01
well let me answer my own question-
I'll let you know,measuring Corona loss is no child's
play.Even if you are well equipped in the field of power
transmission, errors would creep in.
The expression for corona loss is given by
Peek's equation
Pcl = (244/q)*(f+25)*(Sqrt(r/D))*(Vph -Vd0)^2 * 10^ -5
Kw/Kw/phase
You think that's complicated? There is more to come.
In the above expression r is the radius of the wire in
meters and D is the effective distance between the wires in
meters,f is the frequency of transmission voltage,Vph is the
voltage to neutral or the phase voltage and Vdo is the
Disruptive critical voltage.
q = Air density factor which is given by expression
((273)/760)* p/(273+t)
All the calculations for q are done by converting
temperature into Kelvin scale
273 K in the Standard temperature and 760 mm of mercury is
the standard pressure and they are taken into consideration
in the above expression.
p is the atmospheric pressure when measurement is to be done
and t is the temperature in degree celcius at that time
The expression reduces to q = 0.359p/(273+t)
Hold this tight we'll get back to it later on
Now we need only Vdo or the disruptive critical voltage(The
voltage at which corona effect occurs) to calculate the
corona loss
Vdo=go x m x q x rx ln(D/r)
go is the breakdown strength of air.It's about 30KV at
normal temperature.
m is the irregularity or roughness factor of the condutor
which is a given thing.
q is Air density factor which as discussed above
and D and r are the effcetive distance between conductors
and the conductor radius.
No we have all the required things to measure corona loss.
Putting all the values in right place in the Peek's
equation, we get the corona loss.
hope i explained the whole process vividly.
| Is This Answer Correct ? | 7 Yes | 1 No |
Post New Answer View All Answers
What are the advantages of speed control using thyristor?
Could Please Explain briefly. Why used stabilizing resistance series with High impedance bus differential protection relay.
What will be the impact on motor performance if a LT motor is rewound with changed motor winding data as given below:- Original winding data: total 04 wires = 02 wires of 17 SWG + 02 wires of 16.5 SWG. Changed Winding data: total 03 wires of 15.5 SWG wire size Motor rating: 160KW, 740RPM, 415V, ID FAN application. Normal Running Current = 95% of FL Current.
Why air circuit breaker off due to power failure?
why the perameters of secondary circuit are more important then that of the primary circuit of induction motor?
During Starter Panel Com missing I Found The Main Incomer 40Amp MCB 10KA Trip When Motor Change Star To Delta Motor Rating 20HP BUT When We Use Same MCB To Other Motor It Does Not trip Or What Is Necessaries for Star Delta Starter MCB SFU MPCB OR MCCB And What are The Breaking Capacity of MCCB in the Motor above 15HP
WTA used cb?
How to calculate mf when meter equipment and meter are connected
sir pls send the je exam - 2008 and other model question papers..
after how many spot we must chang secondry cable in portable spot welding gun?
Can anyone provide with a SLD for HT panel installation for a 33KV line and distribution end has three 1.5MV transformers. Is it suitable to use OCB or VCB and also provide me the suitable rating and its connection diagram.
what is the current density of copper & alluminium.
Why an ac solenoid valve attract the plunger even though we interchanges the terminal? Will the poles changes?
Ceiling Fan and Storage type water heater. Discuss
what is th basic difference between a d latch time line and a d flip flop time line???
