HHT-DB

HHT-DB is a database comprising photos, sound recordings, ultrasonic signals converted via heterodyning, and reports generated by the Sonotec-Sonaphone III from inspections conducted at a 69/138/230 kV substation in Brazil. This database is associated with the scientific article titled "Advancing substation inspection: The Hilbert-Huang transform approach for partial discharge recognition and assessment," submitted for peer review to the journal Measurement.

HHT-DB includes six field-assessed case studies:

• IS-PhaseA: Insulator string (Phase A).
• IS-PhaseB: Insulator string (Phase B).
• IS-PhaseC: Insulator string (Phase C).
• BN: Background noise, distant from any equipment.
• AS: Ambient sounds in the substation area.
• XFMR: Transformer with the cooling system turned off.

Each case study may contain $n$ sets of records. For instance, measurements for the insulator string, phase A (IS-PhaseA), include three subfolders labeled 01, 02, and 03.

Each subfolder organizes inspection data and records into the following directories:

• Photos: Photographic records of the inspection.
• Report: Automatically generated reports from the Sonotec-Sonaphone III (DataSuite).
• SoundRecordings: Audio recordings captured alongside each ultrasonic signature.
• ThermographicImages: Thermographic images acquired using the Fluke Ti25.
• UltrasonicSignatures: Ultrasonic signatures recorded with the Sonotec-Sonaphone III coupled with the Sonotec-BS30 parabolic sensor.

The figure below illustrates the database structure, highlighting the files contained in subfolder 01 of the case study for the insulator string, phase A (IS-PhaseA).

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Corresponding author: Prof. Dr. Luiz F. Freitas-Gutierres (luiz.gutierres@ufsm.br).

Acknowledgments

The authors would like to acknowledge the R&D Program of the Brazilian Electricity Regulatory Agency (Agência Nacional de Energia Elétrica ANEEL) for facilitating this research endeavor. The investigations discussed in this paper are associated with the project PD-05785-2107/2021-DE2107: "Methodology for aging assessment of insulation in instrument transformers and surge arresters through ultrasonic measurements of partial discharges", conducted in collaboration between CPFL Transmission and the Federal University of Santa Maria (UFSM).