What type of bushings do voltage regulators typically use?

Voltage regulators typically use primary type bushings. These bushings are designed for high voltage applications, which is critical in the context of voltage regulation. Primary type bushings manage the electrical insulation and support necessary for the transmission of power at high voltage levels, ensuring that the electrical components operate safely and effectively under the demanding conditions found in substations.

Primary type bushings are built to withstand the stress associated with high voltage lines and provide a reliable path for current while keeping the voltage at manageable levels for connected equipment. This is particularly important in voltage regulators, which must maintain stable voltage levels for distribution and ensure the reliability of electrical supply to end users.

The other types of bushings listed are less suitable due to their design specifications. Secondary type bushings, for instance, are intended for lower voltage applications and do not meet the high insulation requirements of a voltage regulation system. Insulated bushings also cater to specific applications where isolation is essential but may not handle the high voltage stresses effectively as primary bushings do. Metallic bushings lack the necessary insulation properties needed for high voltage scenarios, making them inappropriate for use in voltage regulators.