Quick Answer
Calculate IEC/IEEE Overcurrent Relay Time-Delay Calculator for Generator Protection
Calculator
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Find Engineering Solutions →Result Interpretation
IEC/IEEE Overcurrent Relay Time-Delay Calculator for Generator Protection calculator computes Operating Time Delay in s using the defined engineering formula and the input values provided. Operating Time Delay is expressed in s. No universal acceptance threshold is defined by this calculator.
Worked Example
Verified calculation
Given:
- Current Ratio (I_fault / I_pickup) = 5
- Time Multiplier Setting = 0.8
- Curve Type Selector = 1
- Curve Coefficient k = 0.14
- Curve Exponent alpha = 0.02
Expected Result:
- Operating Time Delay = 3.4237760567563
Engineering Interpretation:
Under the given input conditions, the calculated result is: Operating Time Delay = 3.4237760567563 s.
The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from deterministically validated test cases.
Formula / Method
operating time delay = time multiplier setting * (curve coefficient k / (pow(I_fault / I_pickup, curve exponent alpha) - 1))Formula family: formula_power_generator_protection_coordination_time_delay_calculator_overcurrent_relay
Variables
| Symbol | Label | Role | Description |
|---|---|---|---|
| I_ratio | Current Ratio (I_fault / I_pickup) | INPUT | Current Ratio (I_fault / I_pickup) |
| TMS | Time Multiplier Setting | INPUT | Time Multiplier Setting |
| curve_type | Curve Type Selector | INPUT | Curve Type Selector |
| k | Curve Coefficient k | INPUT | Curve Coefficient k |
| alpha | Curve Exponent alpha | INPUT | Curve Exponent alpha |
| time_delay | Operating Time Delay | OUTPUT | Operating Time Delay |
Calculation Steps
- Enter the current ratio (i_fault / i_pickup) in 1.
- Enter the time multiplier setting in 1.
- Enter the curve type selector in 1.
- Enter the curve coefficient k in s.
- Enter the curve exponent alpha in 1.
- Step 1: Compute operating time delay.
- Read the operating time delay (s) from the results.
Engineering Summary
Calculate IEC/IEEE Overcurrent Relay Time-Delay Calculator for Generator Protection
Frequently Asked Questions
What does this calculator calculate?
The IEC/IEEE Overcurrent Relay Time-Delay Calculator for Generator Protection calculator estimates Operating Time Delay based on the input parameters you provide
Why is curve coefficient k important in this calculation?
curve coefficient k is directly proportional to operating time delay. When you enter curve coefficient k in s, the calculator uses it in the engineering formula to compute the output
How should I interpret the result operating time delay?
The calculator outputs operating time delay in s. The result is computed directly from the input values using the defined engineering formula
What units should I use for the inputs?
Enter each value in the units shown next to the input field: Curve Coefficient k (s). Make sure all inputs use the specified units for consistent results
What assumptions does this calculator use?
This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment
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