0
Want this question answered?
Be notified when an answer is posted
Add your answer:
Earn +20 pts
How does surge impedance effect on transmittion line?
The SIL=(KV LL / Zo), where the V(LL) is the receiving end voltage in kV and Zo is the surge impedance in ohms. when the line is loaded over its SIL, it behaves like a shunt reactor - absorbing Mvar from the system, and when is loaded less its SIL it behaves like a shunt capacitor, supply Mvar back to the system. So to increase the Surge Impedance Loading (SIL), we need to decrease the the surge impedance of the line, and that can be done by introducing series capacitors (capacitors in series with the transmission line) or shunt capacitors (capacitors in parallel with transmission lines), which means providing Mvar to the system and reducing the Mw. hopefully that helps
What is the effect of shunt capacitor?
A shunt capacitor creates a low resistance path in a circuit so that electricity can pass around to another point. Shunt capacitors create shorts when they receive abnormally high amounts of voltage to correct series circuits.
Will low pass filter works as transmission line?
No, but transmission line act as a lpf
Heating of line reactor due to harmonics?
More of an explanation is needed to give a good answer. It is possible for a line reactor to overheat due to harmonics. What voltage? What is the sub layout? When does this appear to occur? How old is the reactor (perhaps it is actually failing, so the harmonics are just pushing it over the edge)? How big is the reactor? Is there a capacitor bank nearby? Capacitance of the line? Length of the line? When is it switched on/off? How strong is the source bus that it is being switched to (is it turned on and the line is energized locally, or from the remote end)? etc., etc. If possible, a better forum for such a question may be Eng-tips, although there are people here that may be able to give some good insights.
How do you specify the rating of the shunt?
1)may be voltmeter or clipon meter will be connected across the winding. 2)or in motor winding we must find amp current and aramture resistance nd then find the ratings 3)formula is rated kva of motor*1000/base kva for transmission line.
What is the purpose of shunt reactor?
Shunt reactor are generally employed at the end of long transmission line. During charging of line due to ferranti effect receiving end voltage increases dangerously to control this shunt reactors are used.
Are shunt reactors used in nuclear reactors?
Answer 1. The only shunt reactors I know are used on transmission lines to alter power factor. This is nothing to do with the nuclear reactor in a power plant.Answer 2. I agree. Shunt reactors are use on transmission line and EHV to boost voltage, to generate VARs and for power factor correction.
How does surge impedance effect on transmittion line?
The SIL=(KV LL / Zo), where the V(LL) is the receiving end voltage in kV and Zo is the surge impedance in ohms. when the line is loaded over its SIL, it behaves like a shunt reactor - absorbing Mvar from the system, and when is loaded less its SIL it behaves like a shunt capacitor, supply Mvar back to the system. So to increase the Surge Impedance Loading (SIL), we need to decrease the the surge impedance of the line, and that can be done by introducing series capacitors (capacitors in series with the transmission line) or shunt capacitors (capacitors in parallel with transmission lines), which means providing Mvar to the system and reducing the Mw. hopefully that helps
What is the Difference between shunt capacitor and shunt reactor?
One is a capacitor and one is a reactor. Shunted capacitors are used to raise th voltage in the power system, while shunt reactors are used to lower it. Capacitors are typically installed close to load because of this; reactors are typically on very high power lines where the capacitance of the power line can cause severe overvoltages when loading is light, and at large generating stations.
Descibe about shunt reactors?
Shunt reactors are the inductors connected across the power line for power factor correction.The reactors injects reactive power in the transmission line for voltage compensation. The only disvantage of this shunt reactors is that it shorts whenever high voltage or transients occurs.Only stepped variation of the reactive power is possible.
Why leakage conductance is neglected in overhead lines?
The shunt conductance is due to leakage currents flowing across insulators and air. As leakage current is considerably small compared to nominal current, it is usually neglected, and therefore, shunt conductance is normally not considered for the transmission line modeling.
Surge impedance loading of 400kv line?
400KV transmission line surge impedence loading is depent upon the conductor type but its arount 600mw400KV transmission line surge impedence loading is depent upon the conductor type but its arount 600mw.Permissible Line Loading as per CEA Standards+/- 500 kV HVDC bi-pole line=Pole Capacity X Number of Pole in service765 KV line having 4 X 686 sq. mm conductor =2250 MW per circuit765 KV line having 4 X 686 sq. mm conductor operating at 400 kV =614 MW per circuit400 KV line having 2 X 520 sq. mm conductor with shunt reactor =410 MW per circuit400 KV line having 2 X 520 sq. mm conductor without shunt reactor =533 MWper circuit400 KV line having 2 X 520 sq. mm conductor operating at 220 kV =155 MW per circuit220 kV line =132 MW per circuit132 kV Line =50 MW per circuitsource:http://www.mahatransco.in/oa/draft_procedure_calculation_transmission_availability.shtm
Why are transmission lines less than 80km considered short?
The transmission lines which have length less than 80 km are generally referred as short transmission lines. For short length, the shunt capacitance of this type of line is neglected and other parameters like electrical resistance and inductor of these short lines are lumped.
Why capacitance is neglected in short transmission lines?
Wen the length of overhead transmission line is less than 80 km with an operating voltage up to 20kv it is considered as short transmission lines Due to smaller lengths and low operating voltage the charging current is low so the effect of capacitance of short transmission lines is extremely small and therefore can be neglected as in case of distribution lines and only R L is to be taken into account while analyzing short transmission lines
What are difference between bus reactor and line reactor?
A bus reactors a devise installed in a bus to maintain system voltage when the load on the bus changes by releasing reactive power as usable power to bolster the voltage. A line reactor is placed in line at point of use or just after a transformer to maintain a stable amperage to the user, capacitor.
Where is earthing provided in glass line reactor?
Through thermowel tip ( made up of tantalum ), earthing is provided to Glass lined reactor.
How do you change transmission line?
how to fix a transmission without taking it a part how to fix a transmission line
