Revision Standard – Active. A uniform procedure for making corona (partial discharge) measurements by electrical means on electronic transformers is presented. Methods of applying voltage stress, the use of a sine-wave voltage to simulated dc and ac combinations, the types and limitations of voltage stresses encountered, and the acceptable limits of discharge pulse energy are included. Recommended test conditions and the need for negotiation of special tests are discussed. Test apparatus and calibration are described. The aim is to establish a common ground of understanding between transformer and systems design engineers and transformer manufacturers in the development of service and performance requirements.<\/p>\n
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| 6<\/td>\n | 1 Scope 2 Purpose 3 References 4 Definitions <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | 5 Test Conditions Application of This Guide Conditions for Acceptable Corona Tests Frequencies at Which Corona Measurements May Be Performed Effects of Voids in Solid Insulation Corona Discharge Pulse Rise Time 5.2.4 Circuit Response <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | 5.3 Signal-to-Noise Ratio 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 <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | Fig 1 Typical Circuit for Corona Measurement Circuit Fig 2 Typical Circuit for Corona Measurement Circuit <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | 6.4.1 Amplifier 6.4.2 Signal Readout Instrument(s1 Circuit Modifications for Self-Excitation Parallel-T RC Filter Network <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | Calibration Pulse Generator Calibration Coupling Capacitor 6.7 Control Metering 7 Calibration 7.1 Deflection Sensitivity When Calibration Is Performed 7.3 Calibration Technique Peak-to-Peak Voltmeter Circuit <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | Calculating Detection Sensitivity 8 Test Method 8.1 Group 8.2 Group I1 8.3 Group I11 9 Test Requirements 9.1 Ambient Conditions 9.2 Calibration Sensitivity <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | 9.3 Test Voltage DC Plus AC Test Voltage Rate of Application Duration of Tests 10 Bibliography <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | Appendix A Preconditioning for Determination of CIV <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | Appendix B The Magnitude and Energy of Discharges <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | Suggested Specification Requirements <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" IEEE Guide for Making Corona (Partial Discharge) Measurements on Electronics Transformers<\/b><\/p>\n |