Dissolved gases
Fault-gas concentrations, TDCG and rate-of-change trends for internal condition awareness.
Solution / Transformer Monitoring
See transformer condition from the oil inside to the sound and heat outside.
HERTZINNO combines online DGA, moisture trending, acoustic and thermal inspection, fixed partial-discharge monitoring and acoustic fingerprint analysis to support earlier warning and more focused maintenance.
For utilities, substations, generation sites, industrial transformers, data centers and other power-critical facilities.
A multi-signal condition view
Transformer faults do not begin with one signal.
Internal oil-paper insulation faults can appear as changes in dissolved gases and moisture. External insulation stress may generate ultrasonic partial-discharge emissions. Cooling-system, core, clamp or pump abnormalities can change the transformer acoustic signature, while thermal inspection helps verify abnormal heating. These signals are complementary and should be assigned to the failure mode and maintenance objective.
Online DGA, acoustic imaging, thermal imaging and acoustic fingerprint monitoring are not interchangeable. A practical transformer program combines the required layers around transformer value, criticality, access and existing maintenance processes.
Oil moisture
Moisture trends that support insulation-condition assessment and maintenance planning.
Ultrasonic & thermal anomalies
Partial-discharge emissions and temperature changes around bushings, connections and nearby assets.
Operating sound patterns
Changes in transformer hum, cooling fans, pumps, clamps and discharge-related acoustic events.
01 / Internal Condition
Online DGA & Moisture
Track fault gases continuously instead of waiting for the next oil sample.
Online dissolved gas analysis monitors transformer-oil fault gases, moisture and trend behavior to support earlier identification of overheating, arcing, discharge activity and insulation deterioration. The monitoring depth should match transformer criticality and the diagnostic decisions operators need to make.
Typical monitoring priorities- Fault-gas and TDCG trends
- Gas rate-of-change alarms
- Moisture and insulation risk
- Essential versus advanced gas coverage
02 / External Inspection
Acoustic & Thermal Inspection
Locate discharge-related sound and verify external thermal behavior.
Handheld or fixed acoustic and thermal imaging can support inspection of transformer bushings, nearby switchgear, cable terminations and external connections. Acoustic localization helps identify ultrasonic sources, while thermal imaging provides a separate view of temperature distribution and abnormal heating.
Typical monitoring priorities- Bushing and external insulation inspection
- Partial-discharge source localization
- Hot connections and thermal anomalies
- Portable routes or fixed 24/7 coverage
03 / Operating Condition
Acoustic Fingerprint Monitoring
Learn the normal operating sound and flag persistent changes.
Transformer acoustic monitoring captures audible and ultrasonic signatures through fixed sensors, extracts time-domain and frequency-domain features at the edge, and supports threshold or model-based alarms. It can complement DGA by monitoring operating sound, cooler behavior, pumps, clamps, overload-related changes and discharge-related acoustic events.
Typical monitoring priorities- Transformer hum and stability changes
- Cooler fan and oil-pump abnormalities
- Loose clamp or impact-like events
- Local storage and platform alarms
Condition-monitoring workflow
Turn multiple signals into one maintenance decision path.
A complete transformer program should define what each sensor is expected to reveal, how alarms are verified and what maintenance action follows. The objective is not to collect every possible signal, but to build a traceable workflow around asset criticality.
Establish the asset baseline
Confirm transformer type, oil type, loading pattern, operating environment, maintenance history and existing monitoring points.
Assign the signal layer
Use DGA for internal oil condition, imaging for localized acoustic and thermal inspection, and fixed sensors for persistent operating-sound changes.
Trend and verify alarms
Review concentration, rate-of-change, acoustic features, images and operating context before deciding whether field confirmation is required.
Connect to maintenance action
Route events into inspection, oil sampling, offline testing, load review or planned maintenance according to the site's asset-management process.
Asset-to-signal map
Match the transformer risk to the signal that can reveal it.
No single monitoring method covers every transformer failure mode. This map clarifies how HERTZINNO technologies can be assigned without treating gases, sound and temperature as interchangeable signals.
Transformer risk or asset
Early signal
Monitoring layer
Internal thermal or electrical fault
Dissolved fault gases, TDCG and rate of change
Online DGAContinuous gas and moisture trending for internal condition awareness.
Oil-paper insulation condition
Moisture trend and associated gas behavior
DGA + moisture monitoringSupports insulation-risk assessment and maintenance planning.
Bushings, nearby switchgear and terminations
Ultrasonic discharge and thermal anomalies
Acoustic and thermal imagingPortable localization or fixed 24/7 monitoring according to site access.
Core, clamps, coolers, fans and pumps
Persistent change in acoustic signature
Acoustic fingerprint monitoringEdge analysis of sound pressure, frequency, band energy and stability.
Product fit
Choose by diagnostic depth and monitoring workflow.
A single transformer may use one layer or combine DGA, portable inspection and fixed acoustic monitoring. Final selection depends on transformer criticality, fault target, communications and installation environment.
HZ-DGA-500
Essential online DGA
Core fault-gas and moisture monitoring for distribution transformers, compact substations and projects requiring essential continuous trends.
View DGA systems
HZ-DGA-900
Advanced 9-gas + moisture DGA
Broader gas coverage for critical power transformers, grid substations and power-critical facilities requiring deeper online diagnosis.
View DGA systems
HA3T
Handheld acoustic & thermal camera
Portable inspection for partial-discharge localization, abnormal sound and thermal verification around transformer and substation assets.
View product
HZ-FA-371T
Fixed acoustic & thermal imaging
Continuous online localization of discharge-related sound and temperature anomalies at selected transformer or substation monitoring zones.
View product
HZ-FA-8
Transformer acoustic fingerprint monitoring
Edge analysis of operating sound from transformers, coolers, pumps and related equipment, with threshold and AI-based alarm workflows.
View productFrequently asked questions
Planning a transformer monitoring solution.
What does online DGA monitor?
Online DGA tracks dissolved fault gases, moisture and trend behavior in transformer oil. It is mainly used to support early warning of internal thermal, electrical and insulation-related faults.
Can acoustic monitoring replace DGA?
No. DGA monitors gases and moisture inside transformer oil, while acoustic monitoring detects sound-related behavior. They are complementary layers with different diagnostic boundaries.
When should a site use handheld instead of fixed imaging?
Handheld equipment suits periodic routes and flexible inspection targets. Fixed imaging suits selected high-risk areas that require continuous localization, remote alarms or platform integration.
How should DGA500 and HZ-DGA-900 be selected?
Selection should follow transformer criticality, required gas coverage, diagnostic depth and project budget. HZ-DGA-500 provides essential coverage, while HZ-DGA-900 supports broader 9-gas and moisture monitoring.
What can transformer acoustic fingerprint monitoring identify?
It can track changes in operating sound such as unstable hum, cooler or pump abnormalities, loose-clamp behavior, impact events and selected discharge-related acoustic patterns.
Can the monitoring layers connect to an existing platform?
Integration depends on the selected product and project configuration. HERTZINNO products support industrial communication and platform interfaces, but the required protocol, alarm logic and data path should be confirmed for each site.
Plan your transformer monitoring architecture
Tell us the transformer type, oil type, criticality and target fault signals.
Share the transformer rating and application, oil type, existing monitoring, required gas coverage, inspection access, communications, environmental conditions and whether the project requires portable inspection, continuous monitoring or both.