DETECTING VACUUM DEGREE CONDITION OF VACUUM INTERRUPTER BY PARTIAL DISCHARGE MEASUREMENT
Circuit Breaker is one of the important equipment in the electricity system, functions as a breaker both in the process of maneuvering loads or disturbances. The technology of this equipment has also developed rapidly, from using air or oil as an insulation medium up to using SF6 even vacuum. Curren...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/39544 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Circuit Breaker is one of the important equipment in the electricity system, functions as a breaker both in the process of maneuvering loads or disturbances. The technology of this equipment has also developed rapidly, from using air or oil as an insulation medium up to using SF6 even vacuum. Currently, the type of vacuum CB has been widely used since the 1980s and even has an increasing trend due to reliability. The reliability of Vacuum Circuit Breaker (VCB) is dependent on the vacuum condition inside the interrupter. Partial Discharge (PD) measurement is one method used to determine the vacuum condition to detect early leakage from Vacuum Circuit Breaker (VCB). In previous studies, it has been revealed that the pattern of the Partial Discharges Inception Voltage (PDIV) follows the Paschen curve pattern. The present was conducted to study the influence of floating shield of interrupter related to PDIV level as relationship with internal pressure through placing grounded metal plate at a certain length under the floating shield of glass interrupter. PD phenomenon is investigated regarding to floating shield voltage affected by variations in length between floating shield and grounded metal plate and also the pressure condition. The discharge mechanism is also discussed through PD light emission captured by camera. PD characteristic (?q’s pattern and time rise) were observed to categorize based on the internal pressure of interrupter. The result showed that by lowering the length between floating shield and grounded metal plate would shift the curve to lower region. At pressure 3 Pa and below the discharge mechanism was Town-send like mechanism, and would be change as the internal pressure rise to 5 Pa. The ?q’s pattern occurred at zero crossing area and the phase angle become wider as the pressure higher. |
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