Extra-high-voltage

This is more pronounced on high-voltage and extra-high-voltage systems (66 kV and above) when ... 

Another important factor in the availability of coal is an adequate supply of transportation facilities, particularly railroad hopper cars. There is little or no storage at the mines except for unit train shipments, so mines generally cannot operate without an adequate supply of coal cars, wluch determines the number of days of active mine operation. Because of the close a Bnity of coal and rail transportation, the deterrents to expanded coal productive capacity also affect the development of new transportation facilities. Of considerable importance in the future will be an increase in the number of unit trains, which help to reduce transportation costs and the potentials for more coal slurry pipelines and for mine-mouth generating plants for the extra-high-voltage transmission of coal-produced electricity. 

Figure I 2.3 Construction of a) low voltage and b) extra high voltage cable. In the latter, the semiconducting layers equalise the electric field and prevent corona discharges.

Extra High Voltage—Voltage levels higher than 240,000 volts. 

To improve the electrospinning technique and electrospun scaffolds, the electrospinning device can be modified. For example, to increase fiber collection, an extra high voltage supply can be used to connect to the o)llector to provide a negative charge. This can... 

AIS Air-insulated substation ATP Alternative transients program CB Circuit breaker CM Common mode CT Current transformer DM Differential mode DS Disconnector EHV Extra-high voltage (330-750 kV)... 

In extra-high-voltage (EHV) and ultra-high-voltage (UHV) transmission systems, it is a common practice to control the closing surge overvoltage by means of an insertion resistor... 

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