How to Perform Online Noise Monitoring of Dry-Type Transformers? Selecting Noise Sensors and Monitoring Solutions
Date: August 21, 2026, 10:55:54
- Subject of monitoring:Collect noise data in real time from the operating environment of dry-type transformers and continuously monitor changes in operating noise.
- Measurement range:The current noise sensor has a measurement range of 30 dB to 120 dB and a resolution of 0.1 dB.
- Data Communications:Supports RS485 output, allowing noise data to be fed into an integrated online monitoring terminal.
- Mounting method:The sensor can be mounted on a wall or other suitable flat surface using screws.
- Alarm Function:The system can set noise alarm thresholds based on project requirements and record noise alarm information.
- Joint Monitoring:Noise data can be combined with vibration data from dry-type transformers to help monitor the operational status of the equipment.
- Project Customization:The number of sensors, installation locations, alarm thresholds, communication methods, and comprehensive online monitoring functions can be configured according to project requirements. Please contact us for detailed technical documentation.
Online Noise Monitoring of Dry-Type TransformersNoise sensors are typically installed in the transformer’s operating area to continuously collect acoustic data during operation and transmit it to a smart monitoring terminal via communication protocols such as RS-485, enabling real-time data display, alarm threshold configuration, and historical record storage.
If the project only requires monitoring of operating noise, noise monitoring can be configured separately; if it is also necessary to simultaneously monitor winding temperature, core temperature, vibration, ambient temperature and humidity, partial discharge, and electrical parameters, noise monitoring can be integrated intoPHM 300U Transformer Intelligent Monitoring Unit... to form a comprehensive online monitoring solution for dry-type transformers.
What does online noise monitoring for dry-type transformers primarily monitor?
Dry-type transformers produce continuous operational noise during operation. The primary purpose of online noise monitoring is to convert this noise into measurable values that can be continuously recorded, and to observe whether noise levels change during operation.
Compared to manual inspections, which rely on personnel listening for operational sounds, online noise sensors continuously output measurement data, making it easier to compare data across different time periods.
In an integrated online monitoring system, real-time noise data can also be displayed simultaneously with vibration data, providing additional reference information for analyzing the operating status of dry-type transformers.
How is online noise monitoring for dry-type transformers performed?
A typical online noise monitoring solution for dry-type transformers can consist of noise sensors, communication lines, smart monitoring terminals, and a backend monitoring system.
Noise Sensor → RS485 Communication → Smart Monitoring Terminal → Alarms and History → Backend Monitoring System
Once the noise sensor is installed at the appropriate measurement location, it continuously collects on-site noise data and uploads the measurement results to the smart monitoring terminal.
The system not only displays the current noise level but also allows users to set noise alarm thresholds based on project requirements and save historical noise records.
Key Specifications of Dry-Type Transformer Noise Sensors
The current comprehensive online monitoring solution for dry-type transformers uses noise sensors to capture ambient operational sounds. Its main technical parameters are as follows:
| parameters | Technical indicators |
|---|---|
| Measurement range | 30 dB to 120 dB |
| resolution (of a photo) | 0.1 dB |
| Noise Accuracy | ±0.5 dB (reference level: 94 dB @ 1 kHz) |
| output signal | RS485 |
| Power Supply | 10–30 V DC |
| operating temperature | -20°C to +60°C |
The above are the sensor parameters from the current monitoring plan. The number of sensors, installation locations, communication range, and system configuration for actual projects will be determined based on on-site requirements.
Where should the noise sensor for a dry-type transformer be installed?
Noise sensors are primarily used to capture sound in areas where transformers are in operation; therefore, their installation locations must be determined based on the transformer’s surroundings and the on-site structure.
The noise sensor in the current design can be mounted on a wall or other suitable flat surface using two 5mm screws.
In actual engineering projects, it is not recommended to uniformly specify fixed installation locations without on-site information. During procurement or conceptual design, the following information may be provided:
- On-site photos of dry-type transformers;
- The relative position of the transformer to the wall;
- On-site installation space;
- Number of transformers to be monitored;
- Are there multiple locations where noise needs to be recorded separately?
Based on this information, the number and installation locations of the noise sensors can be further confirmed.
Why is it recommended to configure noise monitoring in conjunction with vibration monitoring?
Noise and vibration are both types of data that can be continuously collected during the operation of a dry-type transformer, but they measure different parameters.
| Monitoring projects | Key Monitoring Areas | Typical Sensors |
|---|---|---|
| Noise Monitoring | Audio Data in the Runtime Environment | Noise Sensor |
| Vibration monitoring | Vibration velocity, acceleration, amplitude, etc. | Three-Axis Vibration Sensor |
The integrated online monitoring system can collect both types of data simultaneously, allowing operations and maintenance personnel to view changes in noise and vibration on a single platform.
It is important to note that changes in noise levels alone cannot determine the specific cause of a failure. To further assess the condition of the equipment, a comprehensive analysis should be conducted that combines vibration, temperature, electrical parameters, and other monitoring data.
Can a dry-type transformer trigger an automatic alarm if it becomes too noisy?
Yes. The PHM Comprehensive Online Monitoring Solution supports the configuration of noise alarm thresholds.
When the monitoring data meets the set conditions, a corresponding noise alarm notification can be generated. The system can also save noise alarm records for easy future reference.
Because dry-type transformers vary in capacity, structure, installation environment, and on-site background noise, it is not recommended to use a single fixed value for the noise alarm threshold that applies to all projects.
Specific alarm thresholds can be determined based on equipment parameters, on-site operating data, and project technical requirements.
Is it possible to view historical graphs of noise data for dry-type transformers?
Yes. The integrated online monitoring system supports environmental noise history records, environmental noise curves, and noise alarm records.
Historical data can be used to compare operating noise levels across different time periods, such as to observe changes in noise levels as the equipment operates on different dates or under different operating conditions.
Compared to simply displaying the current noise level, historical trends are better suited for long-term operational condition monitoring.
Should we just monitor noise, or set up a comprehensive online monitoring system?
That depends on the problem the project is ultimately intended to solve.
If users only need to remotely monitor the operating noise of dry-type transformers, a relatively independent noise monitoring solution can be configured.
If a project requires more detailed operational status information, noise can be included as a parameter in comprehensive online monitoring and integrated with other monitoring functions.
Depending on project requirements, the following configurations are available:
- Three-phase winding temperature monitoring;
- Iron core temperature monitoring;
- Three-axis vibration monitoring;
- Operational Noise Monitoring;
- Environmental temperature and humidity monitoring;
- HFCT Partial Discharge Monitoring;
- UHF partial discharge monitoring;
- Monitoring of electrical parameters such as voltage, current, power factor, and power;
- Smoke Alarm Status Monitoring.
The above data can be integrated based on project configuration.PHM 300U Transformer Intelligent Monitoring Unit...with a single terminal handling data display, alarms, historical records, and background communication.
What information is required to purchase an online noise monitoring system for dry-type transformers?
| Information to Be Confirmed | instructions |
|---|---|
| Basic Information on Transformers | Type, Capacity, Voltage Rating, and Nameplate Information |
| On-site Environment | Please provide photos of the transformer and the installation area. |
| Number of Monitoring Points | Number of dry-type transformers requiring monitoring |
| Installation Requirements | Wall location, installation distance, and on-site space |
| Alert Requirements | Is a noise-overlimit alarm required? |
| Communication Requirements | Local Display, RS-485, or Backend Integration Requirements |
| Other Monitoring Features | Should vibration, temperature, partial discharge, electrical parameters, etc., be configured simultaneously? |
If you are unable to determine the number of noise sensors and their installation locations at this time, please provide the dry-type transformer specifications, on-site photos, and project monitoring requirements, and we will assist you in confirming the specific configuration.
Comprehensive Online Monitoring Solution for Dry-Type Transformer Noise—Customizable
Since different dry-type transformer projects vary in capacity, installation environment, background noise, number of monitoring points, and communication requirements, the online noise monitoring solution can be configured based on actual site conditions.
If a project requires not only noise monitoring but also monitoring of vibration, winding temperature, core temperature, ambient temperature and humidity, partial discharge, and electrical parameters, the PHM 300U can be used for centralized monitoring.
The number of noise sensors, their installation locations, alarm thresholds, communication methods, and comprehensive online monitoring capabilities can all be customized to meet project requirements.
For complete technical specifications, product documentation, installation plans, system configuration lists, or project quotes, please contact us to receive detailed information.
View the PHM 300U Smart Transformer Monitoring Device →
Frequently Asked Questions About Online Noise Monitoring for Dry-Type Transformers
Can noise from dry-type transformers be monitored in real time online?
Yes. The noise sensor can continuously collect operational noise data and transmit it to the smart monitoring terminal via RS-485.
What is the measurement range of the noise sensor?
The noise sensor in the current design has a measurement range of 30 dB to 120 dB and a resolution of 0.1 dB.
Where are noise sensors typically installed?
The current solution can be mounted on a wall or other suitable flat surface using screws. The specific mounting location should be determined based on the dry-type transformer and the on-site conditions.
Can an alarm be triggered if a dry-type transformer is making excessive noise?
Yes. The system supports setting noise alarm thresholds and can save the corresponding noise alarm records.
Why Should Noise Monitoring Be Considered in Conjunction with Vibration Monitoring?
Noise and vibration reflect different types of operational data, and monitoring both simultaneously can provide additional condition information. However, the specific causes of anomalies still require a comprehensive analysis that takes into account temperature, electrical parameters, and other monitoring data.
Can the noise monitoring solution for dry-type transformers be customized?
Yes. The number of sensors, installation locations, alarm thresholds, communication interfaces, and whether to configure functions such as vibration, temperature, partial discharge, and electrical parameters can be determined based on project requirements. Please contact us for detailed technical documentation.
Need an online noise monitoring solution for dry-type transformers?
Noise sensors can be configured based on transformer capacity, on-site conditions, and monitoring requirements, and can be further integrated with vibration, temperature, partial discharge, ambient temperature and humidity, and electrical parameters to form a comprehensive online monitoring system.
Please contact us for detailed technical documentation, installation plans, system configurations, and quotes. Monitoring functions can be customized according to your project needs.
