Why are there different coloured current markers on the graph in EcoSet Design Curve Window?

The different coloured current markers in the EcoSet Design Curve Window are used to distinguish key electrical parameters and fault current values, making protection analysis and curve interpretation easier.

Typical examples include:

• Black: Design Current (Ib)
• Green: Minimum Earth Fault Current (IefMin)
• Red: Maximum Short-Circuit Current (Ik3Max)

These colour-coded markers provide a clear visual reference on the protection curves, enabling users to:

• Quickly identify important current values.
• Assess circuit breaker operating behavior under different fault conditions.
• Verify protection coordination and selectivity.
• Compare fault currents against protective device trip characteristics.
• Better understand network performance and protection margins.

By using coloured markers, engineers can more efficiently analyze the relationship between network currents and protection settings during protection and selectivity studies.