Corona Inception Voltage Determination in Electroacoustic Transducer Autotransformers

Abstract

An autotransformer corona inception test circuit has been developed and a prototype has been constructed and demonstrated. Circuit diagrams, component makeup, and component values are presented. Ancillary equipment for the test is identified and recommended, test procedures and precautions are presented, and measured corona inception voltage data and data conclusions, as well as pictorial data are presented for H-core, cup-core, and MPP-core autotransformers. A small but significant percentage of failures in high-power fleet sonar transducers are due to breakdown of electrical insulating or dielectric materials. A physical phenomenon that contributes to these failures is corona (a discharge of electricity caused by ionization of the surrounding medium when the voltage gradient exceeds a certain critical value). The frequency of discharge is above 75 kHz. At high operating voltages corona occurs before dielectric breakdown but will, in time, deteriorate insulating materials and cause dielectric failure.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1991
Accession Number
ADA247871

Entities

People

  • Dean L. Diebel

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Abstracts
  • Autotransformers
  • Circuits
  • Computer Programs
  • Dielectrics
  • Electrical Equipment
  • Electroacoustic Transducers
  • Frequency
  • Instrumentation
  • Lc Circuits
  • Materials
  • Measurement
  • Resonant Frequency
  • Test Equipment
  • Test Methods
  • Transducers
  • Waveforms

Fields of Study

  • Physics

Readers

  • Electrical Engineering
  • Plasma Physics.
  • Systems Analysis and Design

Technology Areas

  • Microelectronics
  • Microelectronics - Microelectromechanical Systems