Permanent Breakdown Research Articles

An electronic electrometer as a versatile corona detector

A new technique is described for the detection and estimation of magnitudes of corona discharges in electric devices during high-voltage testing. This technique employs the electronic electrometer as all instrument to measure the residual charge left in high-voltage structures by both impulse and low-frequency corona or breakdown discharges. For impulse testing, the method can be used with any shape or duration of voltage wave, and for coil sticks it has permitted the prediction of permanent damage and breakdown in many cases. The method is applicable in the testing of high-voltage structures involving at least some solid insulation.

THE ORIGIN AND DEVELOPMENT OF NERVOUS DISTURBANCES EXPERIMENTALLY PRODUCED

The most striking features in this study have been the importance of the individual and the extension of the effects of the conflict for years after its original use as well as the extension to new systems later during the life of the dog. The most important therapeutic indication is the detection of susceptible animals by measuring the reactions under strain, and preventing the progress of the strain to that point at which a permanent breakdown occurs. Once the disturbance is thoroughly established, therapy is difficult. Improvement has been seen with a complete change of environment—removal to farm life for 18 months. Rest in the environment of conflict was unavailing.