01296 434 808 info@indss.co.uk


Our approach to routine maintenance on Transformers is focused around creating a bespoke maintenance programme which meets our client’s business needs and expectations.

We can offer a transformer maintenance service as a once off service or, most usually, as part of our maintenance contract

Our maintenance regimes follow manufacturer’s recommendations as well as legislative requirements. We advise our customers to undertake full intrusive maintenance of liquid cooled transformers once every 4 years and where possible we recommend that air cooled transformers be shut down and maintained annually.

We also advise our customers to take oil samples from oil cooled transformers annually, which we send to our associate laboratory for full analysis.

These are our minimum basic recommendations, this can alter dependent on the site survey taking into account the site layout, environmental conditions and customer requirements.


All such transformer maintenance and inspection works are covered with customer written reports that detail our findings and recommendations.

We can also develop specific and bespoke maintenance regimes, which work in tandem with business and operational needs.


Our Transformer Maintenance Service includes full maintenance of:

Air cooled Transformers

  • In particular dust removal from the enclosure
  • Partial discharge testing on the HV side

Oil cooled Transformers:

  • Breather replacement
  • Partial discharge testing on the HV side
  • Taking oil samples – an oil analysis report will be issued thereafter.
  • Replacement of oil when and if required is undertaken in conjunction with our approved specialist supplier thus ensuring all environmental legislation is adhered to during this operation.

All approved carrier’s licences and waste transfer documentation will be supplied upon completion of works.


What type of companies would require transformer maintenance services?

Several types of companies or organisations may require our transformer maintenance services. These include:

Power Utilities: Electric power utilities and energy companies that operate high-voltage power transmission and distribution systems often have numerous transformers in their networks. They require regular maintenance to ensure reliable and efficient power delivery.

Industrial Facilities: Industrial plants, including manufacturing, mining, and processing facilities, often rely on transformers to step up or step down electrical voltage for their operations. Regular maintenance is crucial to avoid production disruptions and equipment failures.

Commercial Buildings: Large commercial buildings, such as shopping centers, office complexes, hospitals, and hotels, usually have transformers to distribute electrical power throughout their premises. Maintaining these transformers is important to ensure uninterrupted power supply for various services and operations.

Data Centers: Data centers house critical IT infrastructure and servers that require a stable power supply. Transformers in data centers need proper maintenance to prevent power interruptions, which could result in costly downtime and data loss.

Renewable Energy Providers: Companies involved in renewable energy, such as wind farms and solar power installations, often use transformers to connect their power generation systems to the electrical grid. Regular maintenance ensures optimal performance and integration with the grid.

Transportation and Railways: Transportation systems, including railways and metro networks, rely on transformers to power trains and provide electrical infrastructure. Maintenance of these transformers is vital for reliable and safe operations.

Government and Public Sector: Government buildings, public institutions, and infrastructure projects may have transformers in place to meet their power needs. Ensuring proper maintenance helps maintain essential services and facilities.

It’s important to note that transformer maintenance requirements can vary based on the specific industry, transformer type, and usage. Regular inspections, testing, cleaning, and repairs are typical aspects of transformer maintenance to ensure operational efficiency, safety, and longevity. So do please get in touch to see how we can assist with your transformer maintenance requirements.


Why is regular transformer maintenance critical?

Regular transformer maintenance is critical for several reasons:

Performance and Reliability: Transformers are crucial components of electrical systems, responsible for stepping up or stepping down voltage levels. Regular maintenance helps ensure that transformers operate at their optimal performance, delivering a stable and reliable power supply. It helps identify and address any potential issues before they escalate into major failures or breakdowns.

Prevention of Costly Downtime: Transformer failures can lead to significant downtime, disrupting operations and causing financial losses. Regular maintenance helps detect early signs of deterioration, wear, or component failures, allowing for timely repairs or replacements. This proactive approach minimizes the risk of unexpected failures and costly downtime.

Safety and Risk Mitigation: Transformers deal with high voltages and pose potential safety hazards if not properly maintained. Regular inspections and maintenance help identify safety concerns such as loose connections, insulation degradation, or oil leaks that could lead to fires, electrical shocks, or other accidents. Mitigating these risks through maintenance ensures a safe working environment for personnel and prevents property damage.

Extension of Lifespan: Transformers are significant investments for companies, and proper maintenance helps extend their operational lifespan. By addressing issues promptly, performing preventive maintenance tasks, and following manufacturer recommendations, companies can maximize the lifespan of their transformers, reducing the need for premature replacements and associated costs.

Energy Efficiency: Well-maintained transformers operate more efficiently, reducing energy losses and improving overall system efficiency. By keeping electrical connections tight, cleaning cooling systems, and monitoring oil quality, maintenance helps optimize transformer performance, resulting in energy savings and reduced operating costs over time.

Compliance with Standards and Regulations: Many industries have specific regulations and standards governing the maintenance of electrical equipment, including transformers. Regular maintenance ensures compliance with these regulations, preventing potential legal issues and ensuring a safe and reliable electrical infrastructure.

Overall, regular transformer maintenance is critical for maintaining performance, reliability, safety, and longevity. It minimises downtime, reduces costs, improves energy efficiency, and helps companies comply with industry regulations. By investing in routine maintenance, businesses can protect their assets, optimise operations, and ensure a stable and efficient power supply.

INDSS Ltd are one of the UK’s leading independent substation contractors
specialising in high voltage engineering

THINK  Independent Substation Contractors


Independent Substation Services Ltd

Unit 31 Edison Road,
Rabans Lane,
HP19 8TE.

Email Us

Call Us

01296 434 808