1. What is Power Loss in Transformer?

Definition: Power loss in transformers consists of no-load losses (core losses) and load losses (copper losses).

Purpose: This calculator helps electrical engineers and technicians estimate total power loss in transformers for efficiency calculations and thermal design.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Loss} \) — Total power loss (Watts)
• \( P_0 \) — No-load loss (Watts)
• \( I \) — Current (Amperes)
• \( R \) — Resistance (Ohms)

Explanation: The formula combines constant no-load losses with current-dependent copper losses (I²R losses).

3. Importance of Power Loss Calculation

Details: Accurate power loss estimation is crucial for transformer efficiency evaluation, cooling system design, and operating cost calculations.

4. Using the Calculator

Tips: Enter the transformer's no-load loss (P₀), operating current (I), and winding resistance (R). All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What are typical no-load losses?
A: No-load losses typically range from 0.1% to 0.5% of transformer rating and remain constant regardless of load.

Q2: Does this include all transformer losses?
A: This covers major losses. Additional losses like stray load losses may need separate consideration.

Q3: Should I use primary or secondary values?
A: Use values for the side you're analyzing - you may need separate calculations for primary and secondary.

Q4: How does temperature affect the calculation?
A: Resistance increases with temperature - use resistance values at operating temperature for accuracy.

Q5: What's the impact of power factor?
A: This calculation assumes purely resistive load. For reactive loads, use apparent current (I) in the formula.