Potential Transformer - Measurement of High Voltages and High Current - High Voltage Engineering

TL;DR

Potential transformers, also known as voltage transformers, are used for high voltage AC measurement by cascading transformers and adjusting the turns ratio.

Transcript

hello friends in this lecture i am going to discuss the third topic of high voltage ac measurement that is potential transformer this is also called as a voltage transformer that is pt or vt this potential transformer is similar to the current transformer of current measurement in potential transformer the number of turns on primary are more which ... Read More

Key Insights

• ⚡ Potential transformers, also known as voltage transformers, are used for high voltage AC measurement.
• 🙃 The number of turns on the primary and secondary sides determine the voltage transformation ratio.
• 🪡 Errors in potential transformers are caused by magnetizing and leakage impedances and need to be compensated for.
• ⚡ Tappings on the high voltage side allow for adjusting the turns ratio and compensating for errors.
• ⚡ Potential transformers are not suitable for fast rising transient or high frequency voltage, but they can accurately measure harmonic voltages.

Summary & Key Takeaways

• Potential transformers (PT) or voltage transformers (VT) are used for high voltage AC measurement by increasing the number of turns on the primary (high voltage terminal) and decreasing the number of turns on the secondary (low voltage terminal).

• PTs are simple in construction and can be designed for any voltage by cascading transformers and adjusting the turns ratio.

• Ratio and phase angle errors caused by magnetizing and leakage impedances can affect the accuracy of potential transformers, which can be compensated by adjusting the turns ratio.