VT Ratio Calculator
Calculate the VT secondary voltage from the primary voltage or find the required VT ratio for your system. Includes formulas, tables, and examples for easy conversion.
voltage transformer ratio formula
The ratio of the VT is used to denote the process of reducing a high primary voltage down to a standard secondary voltage. Calculate it by the formula: Vs = Vp(Ssec/Pvt) in which Vp is the primary voltage, Pvt is the VT primary rating, and sec is the secondary voltage rating. The proper choice of VT ratio allows safe and proper metering and protection in an electrical system.
Formula & Table Summary:
- Secondary Voltage: V_s = V_p × (S_sec / P_vt)
- Required VT Primary: P_vt = V_p × (S_sec / V_s)
- Primary-Equivalent from Measured Secondary: V_p_eq = V_s × (P_vt / S_sec)
Converter Table (Input → Output):
| Input | Formula | Output |
|---|---|---|
| VT ratio & Primary Voltage | V_s = V_p × (S_sec / P_vt) | Secondary Voltage |
| Primary Voltage & Desired Secondary | P_vt = V_p × (S_sec / V_s) | Required VT Primary |
| Measured Secondary & VT ratio | V_p_eq = V_s × (P_vt / S_sec) | Primary-Equivalent Voltage |
vt primary secondary conversion
Voltage Transformer (VT) ratios reduce high primary voltages to standard secondary voltages (e.g. 110 V or 120 V) to be used in metering and protection. The VT ratio is indicated as Primary / Secondary, e.g. 11 kV / 110 V. To compute secondary voltage, primary voltage multiplied by secondary rating/VT primary rating. The proper ratio of VT is selected to make the measurements correct and in order to prevent overload of metering circuits. The guide will include formulas, converter tables, the sample calculation, low-competition keywords, image metadata, FAQs in the JSON format, and ready TailwindCSS parts to be implemented immediately. The VT ratio calculator enables electrical engineers, technicians and students to compute secondary voltages with safety and accuracy with respect to primary systems.
voltage transformer calculator
| Scenario | Input | Calculation | Result |
|---|---|---|---|
| Example A | VT 11kV/110V, V_p = 5.5 kV | V_s = 5.5 × 110 / 11000 | 55 V |
| Example B | VT 33kV/110V, V_p = 16.5 kV | V_s = 16.5 × 110 / 33000 | 55 V |
| Choose VT | V_p = 22 kV, desired V_s = 110 V | P_vt = 22 × 110 / 110 | 22 kV recommended |
| Back-Calc | Measured V_s = 100V, VT 11kV/110V | V_p_eq = 100 × 11000 / 110 | 10 kV |
