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Listing of Variables Utilized in AmpCalc, (Page 3 of 3)

Variable Description Units

Rcap

Overall thermal resistance between conductor & ambient

Thermal ohm-ft

Rd

Duct thermal resistance

Thermal ohm-ft

Rdc

Conductor dc resistance at conductor specified or rated temperature

microhms/foot

Reactance

Conductor ac reactance used for voltage drop calcs

ohms/1000 feet

Resistance

Conductor ac resistance used for voltage drop calcs

ohms/1000 feet

Ri

Insulation thermal resistance

Thermal ohm-ft

Rj

Cable Jacket thermal resistance

Thermal ohm-ft

Rsd

Thermal resistance between cable exterior and duct interior

Thermal ohm-ft

Shield

Cable shielded? Yes or No

Shield

Shield grounding, No shield, Shield w/1 end grd or Shield w/2 end grd

Shield Dia

Shield mean diameter

Inches

Shield Rdc

Shield dc resistance

microhms/foot

Shield Th

Shield thickness

Inches

Shld X

Mutual reactance conductor to shield

Microhms/foot

SIC

Insulation Specific Inductive capacitance (SIC), SIC = SIC x e^(SIC exp x Temp)

SIC Exp

Insulation SIC exponent, overall SIC = SIC x e^(SIC exp Temp)

Size

Cable size designation

Spacing

Spacing between conductors in the same phase group

Inches

Specified Amps

Specified conductor current

Amperes

Specified Temp

Specified conductor temperature

Deg C

Sys Freq

Applied power frequency in cable

Hertz

Sys kV

Applied cable line-to-line kilovolts

kilovolts

System

Number of system (assigned in order entered)

Temp

Calculated or specified total conductor temperature

Deg C

Thermal Factor

Factor specifying relative heating at each cable position

Type of underground system

Type of underground system, ductbank or direct buried

Underground system filename

Path and *.ugs filename where underground system data stored

Voltage Mag

Source or load voltage magnitude in load flow calcs

Volts

Voltage Deg

Source or load voltage phase angle in load flow calcs

Degrees

Volt Drop (+%) or Rise (-%)

Voltage drop or rise across circuit length, = 100 x (Vsource-Vload) / Vsource

%

Watts/ft

Total cable watts loss per foot

Watts/foot

Wd

Cable dielectric loss

Watts/foot

x Coord

Position x coordinate

Inches

y Coord

Position y coordinate

Inches

Yc

Increment of Rac/Rdc ratio due to conductor effects = Ycs + Ycp

Ycp

Increment of Rac/Rdc ratio due to conductor proximity effect

Ycs

Increment of Rac/Rdc ratio due to conductor skin effect

Yp

Increment of Rac/Rdc ratio due to pipe or conduit losses

Ys

Increment of Rac/Rdc ratio due to total shield losses = Ysc + Yse

Ysc

Increment of Rac/Rdc ratio due to circulating currents in shield

Yse

Increment of Rac/Rdc ratio due to eddy currents in the shield

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