Variable Load Problems

always greater

the diversity factor is __ than 1.

also lowered

If the pressure in the steam line decreases below that in the accumulator, the accumulator pressure is ___.

highly variable demand

Industrial processes and domestic uses impose ___ upon the capacity of the plant.

high load , diversity factors

___ and ___ are desirable quantities.

plant capacity factor

another term which is useful in variable load studies is.

hydro units

are more reliable than steam units and usually give some advanced indication of loss of power.

large hydro-electric units

are not able to respond to sudden swings of load.

air,fuel and water

are raw materials for steam power.

Load Factor

defined as average load divided by the peak load.

utilization factor

defined as maximum demand of the system divided by the rated capacity of the system.

plant capacity factor

defined as the actual energy production divided by the maximum possible energy that have been produced during the same period.

demand factor

defined as the actual maximum demand divided by the connected load.

not be able to meet

during peak load period the plant will _____ the load demand.

lesser

greater the diversity factor, __ the cost of generation of power.

ideal load

have constant magnitude and steady duration.

rises above

if the pressure in the steam line ____ that in the accumulator, the accumulator will absorb steam until the heat added raises the saturation temperature.

peak load power plant

includes diesel-electric and gas turbine power plants.

base load power plant

includes steam, hydro-electric and geothermal power plants.

steam accumulator

is an unfired pressure vessel containing water to which excess steam from the boiler is sent during a charging cycle.

modification of capacity factor

is obtained by using only the actual number of hours the plant was in operation.

load duration curve

is obtained from the dame data as the daily load curves for a one year or a period of 8760 hours.

plant use factor

is the annual kilowatt hours production divided by the kilowatt of capacity times number of hours plant was in operation.

monthly load curve

is the average of the daily load curves over a one month period that is used in establishing the rates.

annual load curve

is the average of the daily load curves over a period of one year that is used in determining the annual load factor.

peak load

is the daily fluctuation of electricity use, it is usually lowest in the wee hours of the morning and highest in the early evening.

Maximum Demand

is the greatest demand of load on the power station during the given period.

base load

is the level that is typically does not go below,that is, the basic amount if electricity that is required.

variable load

is the load on a power station varirs from time to time due to the demand of consumers.

connected load

is the sum of continuous ratings of all the equipment connected to the supply the system.

diversity factor

is the sum of individual maximum demand, divided by the maximum simultaneous demand of the system.

increase torque of the motor

it also must be followed by an increased of flow of fuel, air and water to the steam generator.

less than unity

load and demand factor are always_; diversity factor and more than unity.

capacity factor

measures the percentage of maximum plant output that the load curve allows the unit to produce.

exchange off-peak power

one of the advantage of electrical interconnection is the ability to.

load curve

refers to the graph use to represent the relationship between the demanded load and time sequence.

average load

the average loads occurring on the power station in given period is known as.

reverse capacity

the difference between load and capacity factor is an indication of.

decrease

the investment cost per kilowatt of capacity increase as the size of the unit____.

hydroelectric development

the possible____sites along the flow of a steam are two types, these suitable for run of the river plants and those offering natural impoundment bases for storage plants.

not completed

the power plant product is_until the instant it is needed and then only in quantities exactly equal to the instantaneous demand.

storage batteries

the principal use of ____ for peak load is in connection with fraction system which for speed control reasons, use direct current.

mirrored

the variable load placed upon the electric generators of a powerplant is ___ in the steam demand on the boilers and on various other components.

absorb or give up

the water in the accumulator will ______, depending upon the pressure in the steam line reading to it and its saturation temperature.

lower the demand factor

the_, the less system capacity required to serve the connected load.

lower the capacity factor

the____of a station the less is the utilization of the investment.

flywheel

under certain favorable conditions a heat energy_may be interposed between a steam generator as a variable use of steam.

operating problems

when the power plant has been built and connected to a distribution system the variable load conditions imposes___.

fully charged

when the water being charged reaches saturation temperature at boiler steam pressure. the accumulator is____.

annual capacity factor

would be the annual kilowatt hours produced by the kilowatts of plant capacity times hours of the year.