1 Answer
The PT (Potential Transformer) ratio for a 220 kV system depends on the secondary voltage required for measurement or protection purposes. Typically, PTs step down high voltage to a lower, standardized voltage (like 110V or 120V) that can be safely measured by instruments.
For example:
- **If the secondary voltage is 110V** (common for PTs), the ratio would be **220,000 V / 110 V**, which simplifies to a ratio of **2000:1**.
This means that for every 2000 volts on the primary side (220 kV), the PT will produce 1 volt on the secondary side (110 V).
However, PT ratios can vary based on the application, so the exact ratio could be different depending on the system and equipment in use.
For example:
- **If the secondary voltage is 110V** (common for PTs), the ratio would be **220,000 V / 110 V**, which simplifies to a ratio of **2000:1**.
This means that for every 2000 volts on the primary side (220 kV), the PT will produce 1 volt on the secondary side (110 V).
However, PT ratios can vary based on the application, so the exact ratio could be different depending on the system and equipment in use.