GUIDE FOR TESTING TURN INSULATION ON FORM-WOUND STATOR COILS FOR ALTERNATING-CURRENT ELECTRIC MACHINES
Institute of Electrical & Electronics Engineers
1 Overview
1.1 Scope
1.2 Purpose
2 References
3 Service conditions
3.1 Operating stress
3.2 Transient stress
3.3 Withstand requirements
4 Suggested test devices
4.1 Test requirements
4.2 Suitable devices
4.2.1 Conduction-type devices
4.2.2 Induction-type devices
5 Test procedure
5.1 Test sequences
5.2 Test conditions
5.3 Voltage levels
6 Surge test levels for new coils
6.1 General
6.2 Standard (3.5 p.u.) withstand envelope
6.3 Alternate withstand envelope
6.4 Definition of surge envelopes
6.5 Abnormal surges
6.6 Precautions
6.7 Reduction in test levels for uncured coils
7 Maintenance tests or tests after installation of machines
7.1 Test voltage level
7.2 Conduction-type devices
7.3 Induction-type devices
7.4 Insufficient coupling
7.5 Other methods/further details
Annex A (informative) Test procedure and methods
Annex B (informative) Sample test form
Annex C (informative) Bibliography
The purpose of this guide is to make suggestions on testing the dielectric strength of the insulation separating the various turns from each other within multiturn form-wound coils to determine their acceptability. Typical ratings of machines employing such coils normally lie within the range of 200 kW to 100 MW. Test voltage levels described do not evaluate the ability of the turn insulation to withstand abnormal voltage surges, as contrasted to surges associated with normal operation.
| Document Type | Standard |
| Status | Current |
| Publisher | Institute of Electrical & Electronics Engineers |
