Summary
Several methods for detecting stator core interlaminar short circuits in turbine generators including the electromagnetic core imperfection detection (EL CID™) and the core loop heating with entire core excitation have been available. They are practical and widely used methods for detecting interlaminar short circuits located on the inner periphery of a stator core including core teeth and slots, but they may be less sensitive to those distant from the inner periphery of the stator core.
Read more Read lessAnother detection method of stator core interlaminar short circuits measures induced voltages of separated stator core regions in the axial direction. In principle, the induced voltages are proportional to the length of the stator core under the condition that the stator core is uniformly excited. If an interlaminar short circuit occurs on or in the stator core, the induced voltage decreases because the short circuit current generates a magnetic flux that counteracts the main magnetic flux in the stator core. This detection method seems to be effective for interlaminar short circuits distant from the inner periphery of the stator core. We measured the induced voltages of an actual stator core of a turbine generator by intentionally short-circuiting it to confirm how this detection method is effective in the field.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | A1_12610_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Serbia |
| Study committees | |
| File size | 1 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
NAKANO Ryuya - Mitsubishi Generator Co., LTD. Japan; SAKO Hiroshi - Mitsubishi Generator Co., LTD. Japan; HOSHI Satoru - Hitachi Mitsubishi Hydro Corporation Japan
Keywords
Interlaminar Short Circuit, Stator Core, Low Flux Loop Test, Generator, Magnetic Flux
