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it will be implemented soon...planning is in progress
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∙ 12y ago
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When was HVDC Cross-Channel created?
HVDC Cross-Channel was created in 1986.
Distinguish between HVDC and HVAC transmission?
DC versus AC.The vast majority of electric power transmissions use threephasealternating current. The reasons behind a choice ofHVDC instead of AC to transmit power in a specific caseare often numerous and complex. Each individualtransmission project will display its own set of reasonsjustifying the choice.A. General characteristicsThe most common arguments favouring HVDC are:1) Investment cost. A HVDC transmission line costsless than an AC line for the same transmissioncapacity. However, the terminal stations are moreexpensive in the HVDC case due to the fact thatthey must perform the conversion from AC to DCand vice versa. On the other hand, the costs oftransmission medium (overhead lines and cables),land acquisition/right-of-way costs are lower in theHVDC case. Moreover, the operation andmaintenance costs are lower in the HVDC case.Initial loss levels are higher in the HVDC system,but they do not vary with distance. In contrast, losslevels increase with distance in a high voltage ACsystemAbove a certain distance, the so called "break-evendistance", the HVDC alternative will always givethe lowest cost. The break-even-distance is muchsmaller for submarine cables (typically about 50km) than for an overhead line transmission. Thedistance depends on several factors, as transmissionmedium, different local aspects (permits, cost oflocal labour etc.) and an analysis must be made foreach individual case (Fig. 3).2) Long distance water crossing. In a long AC cabletransmission, the reactive power flow due to thelarge cable capacitance will limit the maximumtransmission distance. With HVDC there is no suchlimitation, why, for long cable links, HVDC is theonly viable technical alternative.3) Lower losses. An optimized HVDC transmission linehas lower losses than AC lines for the same powercapacity. The losses in the converter stations have ofcourse to be added, but since they are only about 0.6% of the transmitted power in each station, the totalHVDC transmission losses come out lower than theAC losses in practically all cases. HVDC cables alsohave lower losses than AC cables.4) Asynchronous connection. It is sometimes difficult orimpossible to connect two AC networks due tostability reasons. In such cases HVDC is the onlyway to make an exchange of power between the twonetworks possible. There are also HVDC linksbetween networks with different nominalfrequencies (50 and 60 Hz) in Japan and SouthAmerica.5) Controllability. One of the fundamental advantageswith HVDC is that it is very easy to control theactive power in the link6) Limit short circuit currents. A HVDC transmissiondoes not contribute to the short circuit current of theinterconnected AC system.7) Environment. Improved energy transmissionpossibilities contribute to a more efficient utilizationof existing power plants. The land coverage and theassociated right-of-way cost for a HVDC overheadtransmission line is not as high as for an AC line.This reduces the visual impact. It is also possible toincrease the power transmission capacity forexisting rights of way. There are, however, someenvironmental issues which must be considered forthe converter stations, such as: audible noise, visualimpact, electromagnetic compatibility and use ofground or sea return path in monopolar operation.In general, it can be said that a HVDC system ishighly compatible with any environment and can beintegrated into it without the need to compromise onany environmentally important issues of today.
What are hvdc links?
the link in hvdc system is a conductor joining rectifier and inverter in series connection.Answer'HVDC' stands for 'high-voltage, direct-current'. A HVDC link is widely-used for interconnecting independent high-voltage a.c. grid systems, such as UK/France. HVDC links eliminate synchronisation problems between the two a.c. grids.
What is converter transformer and what its function in HVDC transmission?
It is a transformer that is made for the converters. It is (usually) wired with a Wye AND and Delta output. This allows the transformer to output a total of 12, 30 degrees out-of-phase pulses. This gives rise to many advantages with filtering, efficiency, etc...
Is it true that the current supply from electric power generating plants is an alternating current?
Yes, it is true that current supply from generating plants is an alternating current. There is no success found in bulk power generation of direct current ( D.C. ) in a power plant. But yes it is possible to transmit the power in the form of direct current ( High Voltage Direct Current Transmission-HVDC Transmission ) that possible after converting the generated alternating current into direct current with the help of high range converters.
Why dc supply cannot be given to transmission lines?
We can use DC too for the transmission system. Refer HVDC transmission system.
What is hvdc power transmission?
'HVDC' stands for high-voltage, direct current.
How many hvdc lines are there in India?
Three
How many hvdc transmission lines up to now?
Too many to list here, but the popularity of HVDC systems is increasing. There is a wikipedia article on the subject. [But it suggests the New Zealand system is to be dismantled, whereas it is to be replaced in a year with an upgraded system of greater power.]
2 At present how many HVDC lines are there in India?
45 45
What is corona power loss in transmission line hvdc?
A: Transmission lines while there is ceramic insulators providing separation to the phases will have a corona if the insulators are dirty providing small current leakage ionizing the air around it therefore corona effect.
How do you transmit ac power flow in HVDC transmission line?
You don't! That's the whole point of a d.c. transmission line.
What is operation of HVDC system?
HVDC system is electric power transmission system to transmit bulk power over long distances with High DC voltage and current. The operation of HVDC system means the transmissing power from generating source to load destinaton.
At present how many HVDC lines are there in India?
two lines are there. one in delhi.. 2nd one connecting andhra and orissa
When was HVDC Moyle created?
HVDC Moyle was created in 2001.
Can two power systems having different voltages be synchronised?
yes. it is happen only for HVDC transmission .. but we can't set different voltage at A.C transmission system...
What is system of operation?
HVDC system is electric power transmission system to transmit bulk power over long distances with High DC voltage and current. The operation of HVDC system means the transmissing power from generating source to load destinaton.
