Diversity Factor Formula

Diversity issue is outlined because of the quantitative relation of the add of individual demand to the easy lay demand on the facility station. the range issue (DF) is reciprocally associated with the most demand (MD). a better DF indicates that MD is going to be lower and therefore the investment on the station are going to be lower. it’s typically fascinating to get the DF as high as doable.

DF = Sum of individual max demand / Maximum demand of the whole station

Diversity factor:

    • Diversity issue is that the quantitative relation of the total of the individual most demands of the varied subcircuit of a system to the most demand of the entire system.
    • Diversity issue = total of Individual most Demands / most Demand of the System.
    • Diversity issue = put in load / Running load.
    • The diversity issue is often >= 1.
    • Diversity issue is often >1 as a result of the total of individual Georgia home boy. Demands >Max. Demand.
    • In different terms, Diversity issue (0 to 100%) could be a fraction of Total Load that’s specific item contributed to peak demand. seventieth diversity implies that the device operates at its nominal or most load level seventieth of the time that it’s connected and turned ON.
    • It is expressed as a share (%) or a quantitative relation over one.
    • If we tend to use diversity price otherwise than it ought to be increased with Load and if we tend to use in numerical price (>1) then it ought to be divided with Load.
    • Diversity happens in Associate in Nursing software system as a result of all masses connected to the System aren’t operative at the same time or aren’t at the same time operative at their most rating. the variety issue shows that the entire electrical load doesn’t equal the total of its elements thanks to this point reciprocality (i.e. diverseness).
    • In general terms, we will say that diversity issue refers to the p.c of your time out there that a machine. seventieth diversity implies that the device operates at its nominal or most load level seventieth of the time that it’s connected and turned ON.
    • Consider 2 Feeders with constant most demand however that occur at completely different intervals of your time. once provided by a constant feeder, the demand on such is a smaller amount the total of the 2 demands. In electrical style, this condition is understood as diversity.
    • Diversity issue is Associate in the Nursing extended version of demand issue. It deals with the most demand of various units at a time/Maximum demand of the complete system.
    • Greater the variety issue, lesser is that the price of generation of power.
    • Many designers choose to use unity because the diversity thinks about calculations for coming up with ideology as a result of plant load growth uncertainties. native expertise will justify employing a diversity issue larger than unity, and smaller entree conductors and electrical device necessities are has chosen consequently.
    • The diversity issue for all different installations are {different|totally completely different|completely different} and would be based mostly upon a neighborhood analysis of the masses to be applied at different moments in time. forward it to be one.0 may, on some occasions, end in an offer feeder and instrumentation rating that’s rather larger than the native installation warrants, Associate in Nursing an over-investment in cable and instrumentation to handle the rated load current. it’s higher to judge the pattern of usage of the masses and calculate a suitable diversity issue for every specific case.

Calculation:

    • One Main Feeder has 2 Sub feeder (Sub Feeder A and Sub Feeder B), Sub Feeder-A have demand at a time is thirty-five kilowatt and Sub Feeder-B have demands at a time is forty-two kilowatt, however, the most demand of Main Feeder is 70 kilowatt.
    • Total individual most Demand =35+42=77 kilowatt.
    • Maximum Demand of whole System=70 kilowatt
    • So Diversity issue of The System= 77/70 =1.1
    • Diversity issue will increase higher than 1.

Use of diversity factor:

  • The Diversity issue is applied to every cluster of hundreds (e.g. being provided from a distribution or sub-distribution board).
    Diversity issue is usually used for a whole a coordination study for a system. This diversity issue is employed to estimate the load of a specific node within the system.
  • Diversity issue may be accustomed to estimate the overall load needed for a facility or to size the electrical device.
  • Diversity factors are developed for main feeders supply variety of feeders, and usually one.2 to 1.3 for Residence shopper and one.1 to 1.2 for industrial Load. 1.50 to 2.00 for power and lighting hundreds.
  • Note: Reciprocal of the higher than quantitative relation (will be over 1) is also utilized in another country.
  • Diversity issue is generally used for distribution feeder size and electrical device furthermore to verifying the most peak load and variety issue is often supported knowing the method. you have got to know what is going to air or off at a given time for various buildings and this may size the feeder. Note for typical buildings diversity issue is often one. you have got to estimate or have a knowledge records to form twenty-four hours load graph and you’ll verify the most demand load for node then you’ll simply verify the feeder and electrical device size.
  • The diversity issue of a feeder would be the addition of the most demands of the individual shoppers divided by the most demand of the feeder. within the same manner, it’s attainable to cipher the range issue on a station, a cable or an entire utility system.
  • The residential load has the best diversity issue. Industrial hundreds have low diversity factors typically of one.4, street light-weight much unity and alternative hundreds vary between these limits.
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Calculation Examples

Example 1: A thermal power plant is responsible for power 2 industrial consumers who have their maximum demands of 10 and 30 MW. It also supplies the municipal grid whose maximum demand is 15 MW.  The overall maximum demand is 35 MW. Find the DF

Solution:

Sum of individual demands = 10 + 30 + 15 = 55 MW

DF = 55/35 = 1.57

Example 2: A hydroelectric power station powers 6 feeders having their individual demands 10, 20, 5, 3, 18, and 22 MW each. The overall maximum demand is 50 MW. Calculate the DF.

Solution:

From the DF equation DF = 78/50 = 1.56

Remember that diversity factor is always larger than 1.

 

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