Partial-Discharge Tests of Multiwinding High-Voltage Transformers for Space TWTAs (Traveling-Wave Tube Amplifiers).
Abstract
The high-voltage transformer is a key component in the power supply, converting a single low voltage from the power bus of a communication satellite to multiple high voltages required by a traveling-wave tube amplifier. Partial-discharge (corona) tests are performed on this component to establish high-voltage integrity and to screen out units with high-voltage defects. These defects are usually voids and cracks occurring in the insulation of the transformer. This report describes investigations conducted to determine how to perform effective partial-discharge tests on transformers to screen out defective units. The aspects of partial-discharge testing that were examined include (1) the test medium (air, vacuum, or dielectric fluid); (2) the test mode (60 Hz ac, ac on dc, or dc); (3) the test configuration (i.e., the testing of each insulation barrier in sequence or the simultaneous testing of all barriers); (4) test voltage magnitude (to four times the operating voltage); (5) test data; and (6) pass/fail criteria. Destructive physical analysis (DPA) was performed on both defective and defect-free transformers to confirm the effectiveness of the recommended PDT procedures.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 23, 1985
- Accession Number
- ADA163882
Entities
People
- Francis Hai
- Kenneth W. Paschen
Organizations
- The Aerospace Corporation