Larger capacity transformers above 600 volts are typically wound for what type of polarity?

Larger capacity transformers above 600 volts are typically wound for subtractive polarity. This type of polarity ensures that the output voltages from stacked transformers will subtract from one another, providing stability when multiple transformers are connected in parallel. Subtractive polarity is crucial when transformers are designed to handle larger voltage ratings and deal with the phase relationships that can occur in high voltage systems. This winding method helps in preventing potentially damaging current flows and ensures that the voltage outputs work cohesively together.

In contrast, additive polarity would be used in applications that require voltage outputs to increase when transformers are connected together, which is less common for larger transformers where subtractive polarity provides more operational efficiency and safety. The other options, such as high and variable polarity, do not specifically relate to industry standards for high-capacity transformer designs, which emphasize reliability and consistent performance in their operation.