1. What is Ieema Short Circuit Force Calculation?

Definition: This calculator estimates the electromagnetic force between conductors during a short circuit event using the Ieema formula.

Purpose: It helps electrical engineers determine the mechanical stresses on busbars and conductors during fault conditions.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( F \) — Force per unit length (N/m)
• \( \mu_0 \) — Permeability of free space (4π × 10⁻⁷ H/m)
• \( I \) — Short circuit current (A)
• \( d \) — Distance between conductors (m)

Explanation: The force is proportional to the square of the current and inversely proportional to the distance between conductors.

3. Importance of Short Circuit Force Calculation

Details: Proper calculation ensures busbar supports and insulators can withstand mechanical forces during faults, preventing equipment damage.

4. Using the Calculator

Tips: Enter the short circuit current in amperes, distance between conductors in meters, and permeability (default 1.256637×10⁻⁶ H/m). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical value for μ₀?
A: The permeability of free space is constant at 4π × 10⁻⁷ H/m (approximately 1.256637×10⁻⁶ H/m).

Q2: How does distance affect the force?
A: The force decreases linearly as the distance between conductors increases.

Q3: Why is current squared in the formula?
A: The electromagnetic force is proportional to the product of the two currents (I × I = I²) in the conductors.

Q4: What's the practical application of this calculation?
A: Used to design busbar supports, calculate required insulator strength, and determine spacing between conductors.

Q5: Does this account for three-phase systems?
A: This is the basic formula for two parallel conductors. Three-phase systems require additional factors for phase angles.