Table of Contents

1. Scope
2. Purpose
3. References
4. Definitions
5. Test Conditions
5.1 Application of the Guide
5.2 Conditions for Acceptable Corona Tests
5.2.1 Frequencies at Which Corona Measurements May Be
       Performed
5.2.2 Effects of Voids in Solid Insulation
5.2.3 Corona Discharge Pulse Rise Time
5.2.4 Circuit Response
5.3 Signal-to-Noise Ratio
5.4 Discrimination Device Sensitivity
6. Apparatus
6.1 Test-Voltage Supply
6.1.1 Self-Excitation
6.2 Coupling Capacitor
6.3 Coupling Impedance
6.4 Corona Detector
6.4.1 Amplifier
6.4.2 Signal Readout Instrument(s)
6.5 Calibration Pulse Generator
6.6 Calibration Coupling Capacitor
6.7 Control Metering
7. Calibration
7.1 Deflection Sensitivity
7.2 When Calibration is Performed
7.3 Calibration Technique
7.4 Calculating Detection Sensitivity
8. Test Method
8.1 Group I
8.2 Group II
8.3 Group III
9. Test Requirements
9.1 Ambient Conditions
9.2 Calibration Sensitivity
9.3 Test Voltage
9.3.1 DC Plus AC Test Voltage
9.4 Rate of Application
9.5 Duration of Tests
10. Bibliography
FIGURES
1. Typical Circuit for Corona Measurement, Circuit 1
2. Typical Circuit for Corona Measurement, Circuit 2
3. Circuit Modifications for Self-Excitation
4. Parallel-T RC Filter Network
5. Peak-To-Peak Voltmeter Circuit
APPENDIXES
A. Preconditioning for Determination of CIV
B. The Magnitude and Energy of Discharges
C. Suggested Specification Requirements

Abstract

Covers the detection of corona and measurement of corona magnitude in electronic transformers, test conditions, terminology, test apparatus, calibration and test requirements are included.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Institute of Electrical & Electronics Engineers
Pages
ISBN