Voltage-Restrained Overcurrent (ANSI 51V)
Generator back-up overload relay whose pickup scales with measured bus voltage. Pickup_applied = Pickup_base · (V_actual / V_rated)^n.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Pickup at rated voltage | A | |
| Measured voltage | V | |
| Rated voltage | V | |
| Restraint exponent |
Source: IEEE C37.2 - Standard for protective device function numbers
In short
Generator back-up overload relay whose pickup scales with measured bus voltage.