DC partial discharge/environmental test screening of space TWTs
Conference
·
· Proc., Intersoc. Energy Convers. Eng. Conf.; (United States)
OSTI ID:5412665
Direct-current partial discharge/environmental tests are being conducted on traveling wave tubes (TWTs) designated for long-term space operation to screen out tubes with high voltage defects. Two types of TWTs with different external high-voltage insulation are being examined: TWTs with polymeric potting, and TWTs with ceramic feedthroughs. Detection of high voltage defects in the form of cracks and separations in potted systems is enhanced by combining dc partial discharge testing with environmental (temperature and pressure) testing. These defects are usually caused by high stresses in the potting produced during temperature excursions by the difference in thermal expansion between the potting material and the confining ceramic-metal structure. Tests of all-ceramic-insulated TWTs indicate that the high voltage problem is internal to the vacuum envelope and requires both leakage and discharge measurements for diagnosis. This problem appears to be field emission from contaminated surfaces.
- Research Organization:
- Materials Sciences Laboratory, Laboratory Operations, The Aerospace Corporation, El Segundo, CA
- OSTI ID:
- 5412665
- Report Number(s):
- CONF-830812-
- Conference Information:
- Journal Name: Proc., Intersoc. Energy Convers. Eng. Conf.; (United States) Journal Volume: 5
- Country of Publication:
- United States
- Language:
- English
Similar Records
Partial discharge diagnostics for DC equipment
Partial discharge in a high voltage experimental test assembly
Partial discharge characteristics of oil-immersed insulation systems under dc, combined ac-dc and dc reversed polarity voltage
Conference
·
Mon Dec 30 23:00:00 EST 1996
·
OSTI ID:524647
Partial discharge in a high voltage experimental test assembly
Technical Report
·
Wed Jul 01 00:00:00 EDT 1998
·
OSTI ID:676948
Partial discharge characteristics of oil-immersed insulation systems under dc, combined ac-dc and dc reversed polarity voltage
Conference
·
Wed Dec 31 23:00:00 EST 1975
· IEEE Trans. Power Appar. Syst.; (United States)
·
OSTI ID:7194243
Related Subjects
42 ENGINEERING
420800* -- Engineering-- Electronic Circuits & Devices-- (-1989)
CERAMICS
CONTAMINATION
CRACKS
CURRENTS
DEFECTS
DETECTION
DIRECT CURRENT
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRIC POTENTIAL
ELECTRICAL INSULATION
ELECTRICAL TESTING
ELECTRON TUBES
ELECTRONIC EQUIPMENT
ELEMENTS
EMISSION
EQUIPMENT
LEAKAGE CURRENT
MATERIALS TESTING
METALS
MICROWAVE EQUIPMENT
MICROWAVE TUBES
NONDESTRUCTIVE TESTING
POLYMERS
POTTING
PRESSURE MEASUREMENT
SCREENING
SPACE FLIGHT
STRESSES
SURFACE CONTAMINATION
TEMPERATURE MEASUREMENT
TESTING
THERMAL TESTING
TRAVELLING WAVE TUBES
TUBES
420800* -- Engineering-- Electronic Circuits & Devices-- (-1989)
CERAMICS
CONTAMINATION
CRACKS
CURRENTS
DEFECTS
DETECTION
DIRECT CURRENT
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRIC POTENTIAL
ELECTRICAL INSULATION
ELECTRICAL TESTING
ELECTRON TUBES
ELECTRONIC EQUIPMENT
ELEMENTS
EMISSION
EQUIPMENT
LEAKAGE CURRENT
MATERIALS TESTING
METALS
MICROWAVE EQUIPMENT
MICROWAVE TUBES
NONDESTRUCTIVE TESTING
POLYMERS
POTTING
PRESSURE MEASUREMENT
SCREENING
SPACE FLIGHT
STRESSES
SURFACE CONTAMINATION
TEMPERATURE MEASUREMENT
TESTING
THERMAL TESTING
TRAVELLING WAVE TUBES
TUBES