FIELD: electrical engineering; in-service drying of electrical machine winding insulation and prevention of its damping during outage periods.
SUBSTANCE: electroosmotic drying of electrical machine winding insulation is effected in a cyclic process by applying dc voltage and pulsating voltage of same polarity as dc voltage during each cycle. In the process pulsating voltage is applied during first cycle for 40 -50 min. at frequency of 1000 - 1500 Hz and during second cycle, for 10 - 60 s at 20 - 50 Hz. Novelty is that process is accompanied by third cycle conducted at dc voltage only for 1 - 3 min. at voltage equal to 50 - 75% of rated value, these three cycles being repeated minimum once.
EFFECT: augmented drying process and reduced repeatability of cycles due to ordering water molecules in electric field.
1 cl, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| ELECTROOSMOTIC DRYING METHOD FOR ELECTRICAL MACHINE INSULATION | 2000 |
|
RU2174280C1 |
| PROCESS OF ELECTRIC OSMOTIC DRYING OF INSULATION OF WINDINGS OF ELECTRICAL MACHINES | 1999 |
|
RU2138900C1 |
| 0 |
|
SU1566445A1 | |
| ELECTROOSMOTIC DRYING METHOD FOR ELECTRICAL MACHINE INSULATING SYSTEM | 0 |
|
SU1760606A1 |
| METHOD FOR DRYING SOLID INSULATION OF TRANSFORMER WINDINGS IN SEALED TANK | 2003 |
|
RU2250525C1 |
| METHOD OF ELECTROOSMOTIC DRYING OF WINDING INSULATION OF ELECTRIC MACHINES | 0 |
|
SU1619369A1 |
| METHOD FOR DRYING SOLID INSULATION OF TRANSFORMER WINDINGS IN SEALED TANK | 2000 |
|
RU2174281C1 |
| METHOD FOR IMPREGNATING WINDING INSULATION OF ELECTRICAL PIECES OF EQUIPMENT | 2000 |
|
RU2174279C1 |
| METHOD OF DETECTING DEFECTS IN TIGHTNESS OF ELECTRIC INSULATION | 2003 |
|
RU2250473C1 |
| ELECTRICAL MACHINE ISOLATION DRYING METHOD | 2013 |
|
RU2548030C1 |
