Analysis of Correlation Among Partial Discharges, Ozone Emission, and Ultraviolet Radiation in High Voltage Motor Stator Windings

Tae-Sik Kong

doi:10.11648/j.epes.20170606.14

Abstract

In this research, a normal winding and simulated defective winding were created to examine the correlation between partial discharges, ozone concentration, and ultraviolet radiation in high-voltage motor stator windings. In the simulated defective winding, the semiconductor layer was removed so that discharges could occur easily between the winding surface and the iron core. A high voltage was applied to both normal and defective windings to measure the partial discharge magnitude, ozone concentration, and ultraviolet radiation. Subsequently, the results were compared and analyzed. The electrical partial discharge magnitude, ozone emission, and ultraviolet radiation measurement methods and properties were explained, and all test results and correlations were analyzed.

Highlights

Defects in the insulation system of the stator windings in high voltage motors occur during production or due to thermal, mechanical, electrical, or chemical deterioration after long-term operation
Radiation in High Voltage Motor Stator Windings which has the semiconductor layer to reduce the potential difference between the stator winding and the iron core, and Figure 2 shows the defective winding whose semiconductor layer was removed from the winding surface so that discharges could occur inside the slot, between the winding and iron core [8]
The AC voltage applied between the copper conductor and iron core was increased in steps of 1 kV until the dielectric breakdown of the stator winding sample to measure the partial discharge magnitude and ozone concentration

Summary

Introduction

Defects in the insulation system of the stator windings in high voltage (high voltage) motors occur during production or due to thermal, mechanical, electrical, or chemical deterioration after long-term operation. Such a deterioration leads to dielectric breakdown if not stopped [1]. Partial discharges occur when the application of a high voltage to the stator-winding insulation system causes an abnormal voltage that exceeds the dielectric strength of the defective part. A high AC voltage was applied to a simulated defective winding in which the semiconductor layer was removed to induce discharges in the slot, and to a normal winding to measure the partial electrical discharge magnitude, ozone, and ultraviolet radiation. The correlation between the ozone, ultraviolet radiation, and partial discharge patterns according to defects was analyzed

Test Specimen Creation and Test Method

Test Results and Discussion

Conclusion