CASE STUDY - NOISE REDUCTION AT SOURCE
Reducing Transformer Noise Using a Patented Acoustic Blanket Solution
NB Power reached out to our experts to find an effective solution to reduce the tonal noise from electrical transformers, improving the acoustical climate of residential communities situated adjacent to the Allison and Shediac substations.
Contact our industrial soundproofing expertsNoise issues have become an increasingly important priority for many residential communities. It is within this context that the implementation of a noise reduction solution at the source of electrical transformers is of critical concern.
Utility and energy management companies are becoming progressively aware that the noise being generated by these infrastructures is impacting the quality of life of nearby residents.
For this particular case study, NB Power wanted to find an effective solution to reduce the tonal noise of its electrical transformers using industrial sound reduction methods, to increase the well-being of the surrounding communities.
12 dB Reduction in Overall Noise Contributions
Objective: To Reduce the Impact of Transformer Noise Emissions
The customer (NB Power) was seeking an effective solution to reduce the impacts of noise emissions from electrical transformers located within close proximity to the residential perimeter.
Their goal was to significantly limit, or potentially eliminate, the audible tones being produced by the electrical transformers that were situated between the electrical substations and the adjacent residential areas.
Methodology: measuring session, analysis and recommendations
The transformers responsible for the noise emissions were located at the heart of electrical substations, and situated within close proximity to an established residential community. In order to ensure effective noise reduction in all directions surrounding the substation, a complete acoustical enclosure solution was considered.
Here is the methodology used for this project:
- Evaluate the site and conduct sound & dimensional surveys of transformers producing excessive tonal noise.
- Analyze the current noise climate and the “predicted” noise climate with the implementation of the recommended solution – acoustic enclosure.
- Develop a mechanical design using 3D modeling and drawing (SolidWorks).
- Fabricate the acoustical enclosure and provide on-site installation.
- Post assessment of the noise reduction performance, with acoustic enclosure in place.
The noise reduction that was predicted by theoretical modelling indicated a 10-15 dB reduction in transformer noise emissions, at residences most impacted.
Solution: Implementing an Acoustical Enclosure for the Transformers
The electrical transformers were treated by implementing a custom-designed acoustical enclosure, providing full coverage for effective noise reduction.
The enclosure is comprised of semi-rigid acoustical panels, installed on all four sides and top surface of the transformer tank.
Metal structural elements were attached directly to the outside of the tank, using our patented anti-vibration magnetic method. Custom acoustic panels were then fitted to these self-supporting structures, along with sound-absorbing strips to ensure acoustic tightness.
Each custom acoustic enclosure is carefully designed to provide visual and/or rapid access for transformer maintenance. The enclosure also adds no additional constraints to the transformers' thermal and operational requirements. All electrical components (terminals, wiring, etc.) and thermal components (radiators, fans, etc.) remain unrestricted.
Results: Noise Reduction of 12 dB on Overall Noise Contribution Levels
Following the implementation of the acoustical enclosure, on-site sound measurements were conducted to ensure that the objective had been achieved successfully. The results of the assessment indicated an average 12 dB noise reduction to overall noise contribution levels.
The methodology used to analyze acoustical performance is based on an IEC procedural standard. The end result is that the noise being generated by the transformers has been reduced to below the average background noise levels in the impacted areas.
Acoustical enclosures are an effective and successful sound reduction strategy for reducing noise emissions, thus improving the overall acoustical climate of neighbouring residential communities.
Customer
A Strategic Partner with IPI - A Leader in Industrial Insulation
Soft dB has developed a partnership with IPI Isolation Thermique in the design of our acoustic blankets. Partnering and collaborating with a leader in industrial insulation enables us to deliver a high-quality product, worthy of this multidisciplinary association.
The Solution to your Industrial Noise Challenges
Do you work in an environment with noisy mechanical equipment? Our acoustic blankets and panels will help you to effectively reduce the exposure of industrial noise. If preceded by a noise reduction study by our experts, the results of our solution are 100% guaranteed.
Tell us about your project