IEEE PC57.147 DRAFT

Description / Abstract: This guide recommends tests and evaluation procedures, as well as criteria and methods of maintenance for natural ester-based (e.g. vegetable oil) insulating liquids. Methods of reconditioning, field applications and diagnostics of natural ester-based insulating liquids are also described.

Purpose

This guide recommends standard tests and evaluation procedures of natural ester insulating liquids for application in distribution and power transformers and other liquid-filled electrical equipment. Natural ester insulating liquids are also being applied in retrofilling existing liquid-filled equipment. This guide provides recommendations for new and retrofill field applications including: field testing of equipment filled with natural ester insulating liquids, methods of reconditioning and reclaiming natural ester insulating liquids, and the analysis results at which reprocessing or replacement of the insulating liquid is necessary.

System design

The reliable performance of natural ester liquids in an insulation system depends upon certain basic liquid characteristics that can affect overall apparatus characteristics. Such liquid characteristics are integral to equipment design for which the manufacturer should have final responsibility. The reliable operation of the equipment in service, for which the transformer operator should have final responsibility, also depends on maintaining certain basic liquid characteristics. Adherence to the recommended liquid characteristics can assist in obtaining the desired equipment characteristics. Other tests or verification of the integrity of the insulation system may be necessary.