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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.
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∙ 13y ago
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What are disadvantages of harmonics?
harmonics increase heating of motors ,transformers and capacitors .Power system protecting relays may operate falsly, meters give inaccurate readings,interference with telephone lines may also occur. Moreover resonance due to harmonics also causes problems
Does using transformers to create high voltages reduce wasted energy in power lines?
Yes. The two main reasons are:For a given size of power line more power can be carried by the line at higher voltage and lower amperage with less resistive heating. The heating due to resistance is a waste of energy. This due to Power = Volts X Amps. The higher the Volts the lower the Amps for some amount of Power. The more Amps carried by a conductor the more heat it will produce due to resistance.Since we can use a smaller size of power line to carry a given amount of power we will use less copper or aluminum to make that power line. The less material we use to make the conductor the less energy we have to use to make that conductor. Also the less energy it takes to transport, install, and support that conductor.
What is difference between neutral grounding reactor and neutral grounding resistor?
They both reduce earth fault levels by inserting impedance in the return path. A reactor is used when the earth fault level wanted is greater than about 25% of the phase fault current. This limit is due to over voltages experienced in arcing faults, the higher the reactor impedance the higher the potential overvoltage. With resistors lower fault levels are possible, but as the resistor has to dissipate all energy it will generally be more expensive and larger than a reactor.
What are peripheral effects of power electronics?
The operations of power electronic converters are mainly based on the switching of power semiconductor devices. Due to this the converters introduce voltage and current harmonics into the source as well as load. These harmonics can cause problems of distortion in the output voltage and current and also electromagnetic interference with the neighboring systems. To reduce these harmonics to an acceptable level it is necessary to introduce filters on the input and output of the converter. To evaluate the performance of the converter the quality of the waveform (voltage and current) needs to be measured using factors such as total harmonic distortion (THD), harmonic factor (HF) and input power factor (IPF). The implementation of proper control algorithm in the controller, generation of harmonics and distortion in the output waveform can be reduced. The switching of the power devices in power electronic converter can cause radio frequency interference due to electromagnetic radiation as a result gating circuits may generate erroneous control signals. This interference problem can be avoided by the use of grounded shielding.
What are the causes of loadsheeding?
1. SCHEDULED MAINTENANCE OF A PARTICULAR GRID 2. DUE TO UPCOMING CALAMITY FOR ANTICIPATED PROTECTION TO PEOPLE 3. DUE TO LINE FAULT AND ISOLATION OF AFFECTED LINE OR GRID 4. ENERGY MANAGEMENT - DUE TO MAINTENANCE OR FAILURE OF SOME UNITS GENERATING POWER PLANT AND WILL SCHEDULE ONLY PRIOTY LOAD OR AREA. 5. ENERGY CRISIS DUE TO OIL SHORTAGE. 6. WAR, CIVIL UNREST, ACT OF GOD, ETC. MAYBE CONSIDERED
What are disadvantages of harmonics?
harmonics increase heating of motors ,transformers and capacitors .Power system protecting relays may operate falsly, meters give inaccurate readings,interference with telephone lines may also occur. Moreover resonance due to harmonics also causes problems
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.
What describes the quality of sound you hear?
Volume.
What is a dangerous condition caused by overheating inside a nuclear reactor?
The dangerous condition that can occur in a nuclear reactor and due to overheating is a nuclear meltdown.
Sources of harmonics?
Harmonics is multiple of fundamental frequency. Spurious is not related to fundamental frequency but it is observed at the output spectrum. Harmonics are generated due to non-linearity of the device. Harmonics can generate spurious. As an example harmonics can produce resonance with mechanical box internal structure and can generate spurious. Harmonics generally generated from TCXO & frequency multipliers. If amplifier is non-linear, this will also generate harmonics. But harmonics very near to carrier generally generates interference to modulating signals. We design final power amplifier as a class AB amplifier to get more output power and better efficiency and also to minimize output power variation with temperature. Since it is non linear amplifier it generates harmonics but it will be very far from carrier and can be filtered easily. See the link for detail :- http://harshit.org/spurious and harmonics.pdf
What is need of space vector pulse width modulation?
due to space vector modulation we can eliminate the lower order harmonics
Increase in volume due to heating?
Expansion
What is cogging torque?
Cogging torque is due to the slotting, and pulsation torque is due to the space harmonics, and both must be reduced for best perfomance of the machine, so it's a negative influence.
What is tidal heating?
Tidal heating is the heating of the Earth due to being pulled on by the Moon and Sun. The Earth is constantly changing shape and heat is a by-product of that.
What type of rock forms due to heating and cooling?
igneous rock is formed by heating and cooling.
What occurs due to repeated heating and cooling of air?
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Does transmission fluids leak due to over heating radiator?
NO.
