What is BS EN 60034-18-31 – Insulation systems used in rotating machines about?
BS EN 60034-18-31 is a European Standard on rotating electrical machines.
BS EN 60034-18-31 describes thermal endurance test procedures for classification of insulation systems used in a.c. or d.c. rotating electrical machines with indirect cooling and form-wound windings. The test performance of a candidate insulation system is compared to the test performance of a reference insulation system with proven service experience. The test procedures described in BS EN 60034-18-31 are intended to compare the thermal endurance performance of the mainwall insulation between conductor(s) and ground and, where required by the design of the coil or bar, the insulation between the turns.
BS EN 60034-18-31 describes general testing principles applicable to thermal endurance testing of insulation systems used in rotating electrical machines.
Note 1: Large machines, especially synchronous generators using bars, may require special thermal evaluation test procedures which are not included in this part. Note 2: Recommended parameters for the diagnostic test may be applied according to IEC 60034-18-42 to formwound coils designed with Type II insulation systems for use in converter applications.
Who is BS EN 60034-18-34- Insulation systems used in rotating machines for?
BS EN 60034-18-34 on insulation systems used in rotating machines is relevant to:
- Manufactures of rotating electrical machines such as stator end-winding  
- Electrical design engineers 
- Mechanical industry
- Companies dealing with electrical systems 
- Retailers and dealers of various rotating electrical machines 
Why should you use BS EN 60034-18-34 - Insulation systems used in rotating machines?
As a result of thermomechanical cycling, the following mechanical degradations can occur in the insulation system of the windings
- Delamination between layers of the insulation
- Delamination between a layer of the insulation and the conductor
- Abrasion at the outer surface of the insulation
BS EN 60034-18-34 provides a designation of the test procedure, test specimens and test objects, heating and cooling cycles, test procedures, tests for qualification, and tests for qualification with report analysis which helps you to ensure the quality for form-wound windings.
Overall BS EN 60034-18-34 helps you to demonstrate the test performance and diagnostic procedures for thermomechanical endurance of insulation systems, ensuring that they play a positive role in the operational efficiency of overall rotating electrical machines.
