Switchgear & GIS
Inspect cabinets, joints, interfaces and nearby insulation for abnormal ultrasonic emissions.
Solution / Partial Discharge Detection
Locate partial discharge before insulation damage becomes an outage.
HERTZINNO combines handheld acoustic imaging, acoustic and thermal verification, PRPD-assisted analysis and fixed online monitoring for substations, switchgear, transformers, cable terminations and other high-voltage assets.
For field inspection teams, utility operators, electrical maintenance teams and online monitoring projects.
Early electrical warning
Partial discharge is a signal to investigate, localize and verify.
Partial discharge can appear as corona, surface activity, floating-potential discharge or other ultrasonic emissions around stressed insulation and electrical connections. The operational objective is not only to hear an abnormal signal, but to identify where it comes from, understand its pattern, preserve inspection evidence and determine the next maintenance action.
Acoustic imaging is a non-contact localization method. It complements, rather than replaces, electrical test methods, oil diagnostics, thermal inspection and engineering assessment.
Transformers & Bushings
Localize external discharge activity around bushings, connections and substation equipment.
Cables & Terminations
Check cable heads, terminations, joints and electrical rooms for localized acoustic activity.
Overhead & Traction Assets
Support inspection of insulators, fittings and exposed high-voltage accessories from a safe distance.
01 / Inspect
Handheld Acoustic Imaging
Scan a wide area and see where the ultrasonic source is located.
Handheld acoustic cameras allow maintenance teams to inspect energized assets without direct contact. The microphone array and beamforming process convert ultrasonic emissions into a visual acoustic map, helping the operator narrow a broad inspection area to a specific component or connection.
Typical inspection tasks- Substation route inspection
- Switchgear and cable-room troubleshooting
- Corona and surface-discharge localization
- Visual evidence for maintenance records
02 / Verify
Acoustic + Thermal Inspection
Use two physical signals when the fault needs more context.
Acoustic imaging helps locate ultrasonic discharge activity, while thermal imaging can reveal associated heating or a separate electrical anomaly. The two views should be interpreted as complementary evidence rather than assumed to show the same fault mechanism.
Best suited for- Transformer bushings and connections
- Switchgear and electrical cabinets
- Cable terminations and bus connections
- Combined sound and hotspot investigation
03 / Monitor
Fixed Online Acoustic Monitoring
Keep critical electrical zones under continuous acoustic observation.
Fixed acoustic cameras support unattended monitoring where periodic inspection is not enough. They can localize acoustic events, retain visual evidence and transmit data to a monitoring platform for remote review and alarm workflows.
Typical deployment areas- Substation and transformer zones
- Switchgear and electrical rooms
- Data-center power infrastructure
- Robot and remote inspection systems
Inspection workflow
Turn an ultrasonic indication into a reviewable maintenance record.
The final diagnosis should consider the equipment type, operating state, frequency range, ambient noise, phase reference, thermal condition and other available electrical evidence. The acoustic image is most valuable when it is connected to a repeatable inspection and verification process.
Survey
Scan the target area and select the frequency range that separates the suspected source from background sound.
Localize
Use the acoustic image and optical view to identify the component or connection producing the signal.
Analyze
Review the signal pattern, PRPD information where available and predicted discharge category.
Verify
Compare thermal, visual, historical or electrical evidence before assigning maintenance priority.
Report
Store images, video, equipment location and observations for follow-up inspection and maintenance action.
Product fit
Choose by inspection method and monitoring frequency.
A site may use one device for routine inspection or combine handheld and fixed systems for critical assets.
HA3
Handheld acoustic camera
Routine acoustic inspection and visual localization of corona, tracking and other PD-related ultrasonic sources.
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HA3T
Handheld acoustic + thermal
Field inspection where acoustic source localization and thermal confirmation are required in one workflow.
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HZ-FA-371
Fixed online acoustic camera
Continuous acoustic localization, PD type prediction and remote platform integration around selected zones.
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HZ-FA-371T
Fixed acoustic + thermal monitoring
Continuous monitoring where abnormal acoustic activity and temperature anomalies need to be reviewed together.
View product →Common questions
Partial discharge detection FAQ
What can an acoustic camera detect in a power system?
It can help locate ultrasonic emissions associated with corona, surface activity, floating-potential discharge and other abnormal acoustic sources around electrical assets.
Does acoustic imaging replace electrical PD testing?
No. Acoustic imaging is a non-contact localization and inspection method. Electrical tests and engineering assessment may still be required for confirmation and severity evaluation.
When should HA3T be selected instead of HA3?
Choose HA3T when the inspection team also needs infrared temperature information to investigate heating, connections or other thermal anomalies during the same route.
When is fixed online monitoring appropriate?
Fixed monitoring is suitable for critical zones, unattended electrical rooms, recurring events or assets that require remote alarms and continuous evidence between manual inspections.
What information should be recorded during inspection?
Record the asset, location, operating state, selected frequency range, acoustic image, optical or thermal evidence, PRPD information where available and recommended follow-up.
Can fixed acoustic cameras integrate with another platform?
HZ-FA-371 and HZ-FA-371T support network and streaming interfaces for project-specific integration with monitoring, robot or third-party platforms.
Plan the inspection method
Tell us the asset type, working distance and whether the requirement is periodic or continuous.
Share the voltage class, target equipment, installation environment, expected distance, available phase reference, current inspection process and platform requirements. HERTZINNO can help select the appropriate handheld or fixed monitoring configuration.