Drive Isolation Transformers Overview
Drive isolation transformers are essential for SCR (Silicon Control Rectifier) variable speed motor drive applications. They provide magnetic isolation between the incoming line and the motor drive, and adjust voltage levels to match the SCR Drive requirements. These transformers are designed to handle mechanical stresses, voltage demands, and harmonics associated with SCR applications.

Specifications

• Available in sizes from 7.5 to 440 kVA, three-phase, 60 Hz.
• Standard designs include delta primary and wye secondary configurations.
• Features include UL-3R enclosures with optional weather shields, taps for voltage adjustments, full capacity secondary neutral, and shielding to reduce line-to-ground noise.
• 10-year warranty provided.

Related Products and Accessories

• Surge Protective Devices
• Line Reactors
• K-13 Rated Transformers for Variable Frequency Drives
• Weather Shields

Applications

• SCR Variable Speed Drives

Sizing Information
To size a drive isolation transformer, follow the drive manufacturer’s recommendations or use the motor horsepower to select the appropriate kVA from the provided selection table.

Design Styles

• Style 4 - Encapsulated
• Style 1 - Ventilated

Selection Table
The selection table provides detailed information on catalog numbers, dimensions, and weights for various kVA ratings and configurations. It includes electrical connection keys and tap settings for different primary and secondary voltage combinations.

Electrical Connections
Details on primary and secondary voltage connections, including tap settings for different configurations, are provided to ensure proper installation and operation.