Overview

This International Standard covers requirements and test methods for unused silicone insulating liquids intended for use in transformers and other electrotechnical equipment. Silicone insulating liquids are liquid organopolysiloxanes whose molecular structure consists mainly of linear chains of alternating silicon and oxygen atoms. Hydrocarbon groups are bonded to the silicon atoms. The characteristic properties of type 1 silicone liquids for transformers are given in a table. Other requirements will be added as needed. Silicone liquids for transformers (type T1) have a high flash and fire point and are therefore flame retardant. If combustion does occur, then the heat release is significantly less than hydrocarbon based oils. In addition to operating at similar operating temperatures to those encountered in transformers containing mineral oil-based transformer oils, silicone insulating liquids (Type T1) can operate at higher temperatures in properly designed electrical equipment. Water is more soluble in silicone liquids than in mineral oils. Other physical properties important to the design of the electrical engineering equipment, such as heat transfer, may differ from mineral oil-based transformer oil-filled designs, and shall be fully considered by the designer. The maintenance of used silicone liquids in electrical equipment is described in another standard, IEC 60944. Silicone liquids degrade in nature to simple, naturally occurring substances. Handling silicone liquids is not hazardous to health. The responsible committee is DKE/K 182 "Flüssigkeiten und Gase für elektrotechnische Anwendung" ("Fluids and gases for electrotechnical applications") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.

Document: references other documents

Responsible national committee

DKE/K 182 - Flüssigkeiten und Gase für elektrotechnische Anwendung