Overview

This document provides detailed technical specifications and characteristics for Meccalte spa's NPE 32 series transformers, including various models (A/4 to F/4) with different power ratings, voltage classes, and insulation classes (Class H and Class F). It covers electrical performance, mechanical dimensions, protection features, and accessory options.

Electrical Specifications

• Voltage Ratings: Multiple voltage configurations are supported, including 115/200/230/400V, 138/240/277/480V, and 120/240V.
• Power Ratings: Power ranges from 6 kVA to 34 kVA depending on the model and configuration.
• Power Factor: 3-phase transformers are rated at 0.8 power factor; 1-phase configurations are also detailed.
• Efficiency: Efficiency percentages vary by model and insulation class, typically ranging from approximately 79% to 84%.
• Frequency: Data provided for both 50 Hz and 60 Hz operation.

Mechanical and Acoustic Characteristics

• Weight: Transformer weights range from approximately 75 kg to 134 kg depending on the model.
• Noise Levels: Noise emissions are specified in dB(A) at 1 meter and 7 meters distances, with values generally between 54 dB(A) and 67 dB(A).
• Air Volume: Cooling air volume is around 6.9 to 7.1 m3/min.
• Dimensions: Detailed mechanical dimensions are provided in millimeters, including flange sizes, bolt hole counts, and coupling dimensions for installation compatibility.

Protection and Accessories

• Mechanical Protection: Options include IP21, IP23, and IP45 ratings.
• Thermal Protection: Thermal protection devices such as PTC and PT100 sensors are available.
• Regulators: Bimetallic devices (DSR) and UVR6 regulators are mentioned.
• Additional Features: Parallel operation capability and heaters are optional accessories.

Transformer Types and Winding Configurations

• Transformers are available in 3-phase and 1-phase versions, with options for reconnected or dedicated windings.
• Special winding designs are noted for certain 1-phase models to optimize performance.

Summary of Key Parameters

Installation and Mounting Details

Comprehensive flange and coupling dimensions are provided to ensure proper mechanical integration. Flange hole counts vary from 8 to 12, with flange angles typically at 30° or 45°. Disc coupling sizes and bolt patterns are specified for secure mounting.

Critical Notes and Recommendations

• Ensure correct selection of insulation class (H or F) based on application thermal requirements.
• Verify voltage and power ratings match system needs, considering frequency (50/60 Hz) and phase configuration.
• Use appropriate mechanical protection rating (IP21, IP23, IP45) depending on environmental conditions.
• Consider optional thermal protection and regulators for enhanced reliability and control.
• Refer to detailed mechanical dimensions for installation planning to avoid compatibility issues.

This document serves as a comprehensive technical reference for selecting and installing Meccalte NPE 32 series transformers, emphasizing electrical performance, mechanical compatibility, and protection features.