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Distribution Transformer Harmonic Derating Guidelines

Measure the resistance of a diverse group of single and three phase distribution transformers from 60 Hz to 1500 Hz. Develop tables which indicate permissible harmonic loads for the folloowing load combinations:

• 60 Hz and 6 pulse drives
• 60 Hz and 12 pulse drives
• 60 Hz and switch mode power supplies
• 60 Hz and compact fluorescent lighting

Tagged: Equipment Testing/Evaluation, Engineering Guidelines, P2-4, P4