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CUMMINS GENERATOR TECHNOLOGIES
Ratings Book for STAMFORD ® Range of AC Generators

Ratings Book for STAMFORD ® Range of AC Generators

Product catalog summary

Introduction
This document outlines the ratings and configurations for STAMFORD® AC generators, emphasizing the need to verify ratings due to potential changes from product improvements.

Winding Configurations
Generators are available in various winding configurations, including 6 lead reconnectable, 12 lead reconnectable, and 4 lead dedicated windings, supporting connection types like star, delta, series star, series delta, parallel star, and parallel delta.

Rating Definitions
Ratings are based on altitudes up to 1000 meters using the Rise by Resistance method. Key ratings include Base Continuous Ratings for continuous use and Peak Standby Ratings for emergency backup, which involve increased temperature rise but reduced lifespan.

Winding Numbers and Voltage Configurations
The document details winding numbers and voltage configurations for 50Hz and 60Hz frequencies, specifying exit leads and configurations for each winding number.

Control Systems and Temperature Ratings
Control systems include AVR Industrial and AVR Marine, with specifications for pole numbers, frequencies, ambient temperatures, and temperature rise classes. Base and peak ratings are provided for different ambient temperatures and temperature rise classes.

Tables and Data
Tables provide detailed kVA and kW ratings for various configurations, winding numbers, and temperature classes, aiding in selecting the appropriate generator configuration.

Conclusion
The document serves as a guide for selecting and configuring STAMFORD® AC generators, stressing the importance of verifying ratings due to potential changes.

Specifications
Specifications for generator windings and configurations are outlined, noting limitations such as the unavailability of certain windings and configurations for specific models.

Temperature Rise
Temperature rise classes include Class F (105/40) and Class H (125/40), with a peak standby rating at Class H (150°C).

Voltage and Connection Types
Various voltage configurations are listed, with specific voltages for each configuration, and detailed kVA and kW ratings for different models.

Power Factor
The power factor is noted as 0.8 for 3-phase and 1.0 for some 1-phase configurations.

Generator Models and Ratings
Comprehensive tables list generator models, including PI, UCI, HCI, and HCKI series, with kVA and kW ratings across different configurations.

Limitations and Notes
Notes highlight limitations, such as unavailable windings and configurations for specific models, and emphasize that certain generators are not offered at specific ratings.

Environmental Conditions
Generators are designed for industrial use at 50 Hz, 4 poles, AVR controlled, and a 40°C ambient temperature.

Marine and Industrial Generators
Marine generators operate at 60 Hz with 6 poles, while industrial generators operate at 50 Hz or 60 Hz with 4 poles, both designed for continuous operation under specified conditions.

Transformer Control
Details on transformer-controlled generators include power factor, voltage, and kVA/kW ratings for 3-phase and 1-phase configurations.

Contact Information
Contact details for Cummins Generator Technologies' head office in Stamford, UK, are provided.

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