WG S Survey on Revision of Clause 6.2.1 to IEEE C57.13.8

Survey # 1

WG’s survey on revision of clause 6.2.1 to IEEE C57.13.8

Insulating Liquids

Clause 6.2.1 of revision 2 of the Draft for Standard C57.13.8 currently states the following:

6.2.1Insulating liquids

Transformers shall be filled with a suitable insulating liquid such as

a)Mineral oil.New, unused mineral oil shall meet the requirements of ASTM D3487.

NOTE 1—IEEE Std C57.106™[B36] provides information concerning the acceptance and maintenance of mineral oil, including dielectric test breakdown criteria according to oil application, age, and test method.

b)Less flammable hydrocarbon fluid.New, unused less flammable hydrocarbon fluid shall meet the requirements of ASTM D5222.

NOTE 2—IEEE Std C57.121™[B44] provides information concerning the acceptance and maintenance of less-flammable fluid in transformers.

c)Silicone fluid.New, unused silicone fluid shall meet the requirements of ASTM D2225.

NOTE 3—IEEE Std C57.111™[B39] provides information concerning the acceptance and maintenance of silicone insulating fluid in transformers.

There are other insulating fluids that may be suitable and are commercially available.At the time of this revision, neither ASTM specifications nor IEEE guides for use in transformers exist.

The proposal being made is to add natural or synthetic esters to Clause 6.2.1

6.2.1 Insulating liquids

Transformers shall be filled with a suitable insulating liquid such as

a)Mineral oil. New, unused mineral oil shall meet the requirements of ASTM D3487.

NOTE 1—IEEE Std C57.106™ [B36] provides information concerning the acceptance and maintenance of mineral oil, including dielectric test breakdown criteria according to oil application, age, and test method.

b)Less flammable hydrocarbon fluid. New, unused less flammable hydrocarbon fluid shall meet the requirements of ASTM D5222.

NOTE 2—IEEE Std C57.121™ [B44] provides information concerning the acceptance and maintenance of less-flammable fluid in transformers.

c)Silicone fluid. New, unused silicone fluid shall meet the requirements of ASTM D2225.

NOTE 3—IEEE Std C57.111™ [B39] provides information concerning the acceptance and maintenance of silicone insulating fluid in transformers.

d)Natural Ester fluid. New, unused natural ester fluid shall meet the requirements of ASTM D6871.

NOTE 4—IEEE Std C57.147™ provides information concerning the acceptance and maintenance of natural ester fluids in transformers.

There are other insulating fluids that may be suitable and are commercially available. At the time of this revision, neither ASTM specifications nor IEEE guides for use in transformers exist.

Please indicate your decision in this proposed change by selecting one of the following choices: