DETECTION AND LOCATION OF ACOUSTIC EMISSIONS FROM PARTIAL DISCHARGES IN OIL-IMMERSED POWER TRANSFORMERS AND REACTORS
Institute of Electrical & Electronics Engineers
1 Overview
1.1 Scope
1.2 Purpose
1.3 Safety warnings
2 Definitions
3 Detection and measurement of PD-Background information
4 Introduction to acoustic PD systems
4.1 All-acoustic system
4.2 Acoustic system with an electrical PD trigger
4.3 On-line (continuous) acoustic monitoring system
5 Acoustic signal and transmission characteristics
5.1 Acoustic signal
5.2 Acoustic signal propagation from source to tank wall
5.3 Acoustic signal propagation within the tank wall
5.4 Velocity of sound in oil
6 AE systems-Equipment specifications
6.1 Introduction
6.2 Acoustic systems that record single events
6.3 Digital signal processing (DSP) workstations that record
acoustic data over extended periods
6.4 On-line (continuous) acoustic PD monitoring systems
6.5 External sensor
6.6 Internal sensor
6.7 Three-sensor system
6.8 Band-pass filter
7 AE testing
7.1 Personnel qualification and certification
7.2 Field versus factory test differences
7.3 General considerations on the application of sensors
8 AE field test procedure
8.1 Introduction
8.2 Test setup
8.3 Sensor placement and initial scan
8.4 Monitoring techniques
8.5 Locating the source of the signal
8.6 Reporting and followup
9 Factory test procedure using an electrical trigger
9.1 Introduction
9.2 Initial sensor placement
9.3 Measurements and changing of sensor placement
10 Characterization of AE signals
10.1 Introduction
10.2 General-AC systems
10.3 Acoustic systems that record single events
10.4 DSP workstations that record acoustic data over
extended periods
10.5 On-line (continuous) acoustic partial discharge
monitoring systems
10.6 HVDC transformers and reactors
10.7 Characteristics of PD from static electrification
10.8 Acoustic activity from thermal faults, the core,
mechanical noises, and other sources
10.9 Comparison between electrical and acoustic signals
11 Integrating AE results with data from oil analysis
12 Acoustic activity interpretation
Annex A (informative) Bibliography
Annex B (informative) Signal processing
Annex C (informative) Wavelet signal processing theory
Annex D (informative) Tutorial and case studies for detection
and location of AE from PD
Pertains to the detection and location of acoustic emissions from partial discharges and other sources in oil immersed power transformers and reactors. Both electrical sources (partial discharge) and mechanical sources (such as loose clamping, bolts, or insulation parts) generate these emissions.
| Document Type | Standard |
| Status | Current |
| Publisher | Institute of Electrical & Electronics Engineers |
| Supersedes |
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