ETT Study Guide Book 3: Component Testing

Y. Insulating Liquids and Gases

1. Properties and Types

Identify properties, types, and applications 2, 3, 4

2. Inspection and Test Procedures

Apply sampling procedures in accordance with ASTM 2, 3, 4

Important EPA Standards

Sampling Procedures

Demonstrate understanding of ASTM dielectric breakdown tests 2, 3

Demonstrate understanding of ASTM moisture content, and purity tests 3

Employ methods and procedures for field testing of insulating oils and gases 4

  • Reserved

3. Interpretation of Test Results

Evaluate results of ASTM tests 2, 3, 4

Important Standards

  • IEEE C57.104 Guide for the Interpretation of Gases Generated in Oil-Immersed Transformers 3 4
  • IEEE C57.106 Guide for Acceptance and Maintenance of Insulating Mineral Oil in Electrical Equipment 4
  • IEEE C57.147 Guide for Acceptance and Maintenance of Natural Ester Insulating Liquid in Transformers 4
  • IEEE C57.111 Guide for Acceptance of Silicone Insulating Fluid and Its Maintenance in Transformers
  • IEEE C57.121 Guide for Acceptance and Maintenance of Less-Flammable Hydrocarbon Fluid in Transformers
  • NETA-ATS 2017: Table 100.4 Insulating Fluid Limits 2 3 4
  • NETA-MTS 2019: Table 100.4 Insulating Fluid Limits 2 3 4


Insulating Fluid Analysis

Recommend corrective actions and remediation techniques 4

Last Update: Aug 21, 2023

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