Analyzer > Calculation parameters > Parameters for load calculation

1 Impulse Loads

Impulse Load MV (kW)	Added load in node points for calculation of voltage rigidity (Active part MV).
Impulse Load MV (kVAr)	Added load in node points for calculation of voltage rigidity (Reactive part MV)
Impulse Load LV (kW)	Added load in node points for calculation of voltage rigidity (Active part LV).
Impulse Load LV (kVAr)	Added load in node points for calculation of voltage rigidity (Reactive part LV).

2 Load Level

Load Level Energy %	All the energy load multiplied with the specified percentage. The normal level is 100%.
Load Level Power %	All the power load multiplied with the specified percentage. The normal level is 100%.

3 Utilization Time

Utilization Time Power (in Hours)

Used as utilization time for power loads. The calculation program use this information to calculate power losses. (See the documentation for calculation methods).

Utilization Time Losses (in Hours)

This parameter shows the number of hours/year to utilize for losses. The calculation program use this information to calculate loss of costs.

(See the documentation for calculation methods).

4 Load Losses

Number of years of load losses	The time in years for which load losses will be capitalized.
Interest %	Interest rate for calculation of the cost for load losses.
Power Cost / kW, year	Used for calculation of the costs for power load losses.
Energy Cost / kWh	Used for calculation of the costs for energy load losses.

5 No Load Losses

Number of Years	Time in years for which no load losses should be capitalized.
Interest %	Interest rate for calculation of no load losses.
Power Cost / kW, year	Used for calculation of the costs for power no load losses.
Energy Cost / kWh	Used for calculation of the costs for energy no load losses.

6 Transformer Regulation

Trf. Regulation MV	On/off switch for regulation of MV power transformers. If regulation is requested the program will calculate a tap changer position, based on the transformers documented regulating range and step percentage. Calculated tap changer position is received from calculated transformer ratio.
Trf. Regulation LV	On/off switch for regulation of LV power transformers. If regulation is requested, then the program will calculate a tap changer position, based on the transformers documented regulating range and step percentage. Calculated switchable position is received from calculated transformer ratio.
Regulation Vt. LV (V)	If transformer regulation is requested and regulation voltage is not stated in dpPower Analyzer documentation. The voltage will be be set on the transformer down side and stated as phase voltage. If "Set voltage" in tap changer data is missing, then "Regulation Vt. LV (V)" will be used.

See appendix: Transformer management

7 Margin Calculation

Can be seen in the result below the power margin.

V. Drop Mar. Calc %	Is used for calculation the margins of efficiency, considering maximum accepted voltage drop.
Cosfi Marg. Calc	Is used for calculation of power factor margins. If no value has been set, then it is not possible to calculate the reactive power margin.

The relative load levels for all cables and the relative transformer load for all transformers are included.

The result will contain either available power margin or "0" in every single point in the network.

Available margin can be both reactive power and active power. If it is a reactive power margin that exists, a cosfi needs to be set to calculate a load pattern for reactive power. (Cosfi Marg. Calc) In the result there is a flag that describes what type of power that has been calculated. The flag PQ Margin type is either =P or =Q.

Calculation method

Restriction control 1

To obtain a result it can not exist any cable or transformer that is loaded with more than 100% in the feeding routes result point > feeding point.

Restriction control 2

It is not allowed for any point in the result that has a percentage voltage drop that is bigger than or equal with the one that has been set in the parameters (V. Drop Mar. Calc %).

Result

PQ Margin type.

Flag the type of power that is limited in the margin calculation.

P=Active power.

Q=Reactive power.

Power margin current/power

Margin power when using restriction control 1.

Power margin voltage drop

Margin power when using restriction control 2.

Note! That a result is given in every node one by one but it is the total margin power that will be presented. This means that if a result is obtained in node A1 as 20kW there is only enough margin in the entire network for this. If you add an extra power=20kW in A1 then there will be no margins left for further power around the node A1.

Can be viewed under Power margin.

Sp fall marg.ber. % - Used to calculate power margin at each node regarding the maximum allowable voltage drop.

Cosfi marg.ber - Used to calculate power margins. If no value is given here, there will not be any eventual reactive power margin calculated.