Skip to main content
Calcimator

Transformer Loading Calculator

Calculate percent loading, hot spot temperature, and remaining life.

Inputs

kVA
kVA
°F
hrs
years

Results

Loading

80%

Hot Spot Temp

80 °C

Aging Acceleration Factor0.04
Loss of Life0%
Est. Remaining Life29.5 years
How to Use This Calculator
  1. Enter Rated Capacity, Actual Load, and Ambient Temperature.
  2. Set Hours at This Load and Transformer Age.
  3. Review Loading (%) and Hot Spot Temp (°C).
  4. Use Aging Acceleration Factor and Loss of Life (%) to inform your decision.

How the result changes with Rated Capacity

Rated CapacityLoadingHot Spot Temp
50,00916%33.8 °C
175,0074.6%30.5 °C
325,0042.5%30.2 °C
450,0011.8%30.1 °C

What each input means

Rated Capacity
Transformer nameplate kVA rating.
Actual Load
Current load on the transformer.
Ambient Temperature
Ambient air temperature around the transformer.
Hours at This Load
Duration of the loading period.
Transformer Age
Current age of the transformer.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Rated Capacity = 10000, Actual Load = 8000, Ambient Temperature = 30, Hours at This Load = 8 = 5 input(s) provided
  2. Calculate Loading
    Loading
    80 = 80
  3. Calculate Hot Spot Temp
    Hot Spot Temp
    80 = 80
  4. Calculate Aging Acceleration Factor
    Aging Acceleration Factor
    0.04 = 0.04
  5. Calculate Loss of Life
    Loss of Life
    0.0002 = 0.0002

Related Calculators

The questions that sit next to this one — chosen by subject, including calculators filed under a different category.

Power Grid

Load Flow Calculator

Calculate power flow, losses, and voltage drop through transmission lines.

Power Grid

Voltage Drop Distribution Calculator

Calculate voltage drop across a distribution feeder.

Electrical Engineering

Transformer Sizing Calculator

Size single-phase and three-phase transformers: calculate required KVA, full load current, and select next standard size.

Power Grid

Demand Response Savings Calculator

Calculate revenue and savings from demand response load curtailment.

More in Energy & Utilities.