Onsite Refurbishment

TxMonitor® provide onsite refurbishments of oil filled power transformers and distribution transformers of any make, age, power rating (MVA) and voltage class (kV). TxMonitor® has in-depth knowledge and expertise of customer functional demands and Failure Mode Effect Analysis (FMEA) that arise from different operating environments.

The engineering team at TxMonitor® share a wealth of experience in the design, manufacture, field installation, commissioning and refurbishment of power transformers. To date, our largest onsite transformer test and inspection project is a 375 MVA, 300/21 kV generator unit manufactured in 1984.

The cost of onsite testing, inspection and repair can often be less than the high cost of returning a power transformer to a workshop. Even a short journey (100km) can cost upwards of $100,000 and typical costs include preparing a transformer for transport, craneage costs and transport to the repair facility. These costs can be much more if the transformer is located at a remote site where appropriate craneage may be difficult to source.

Pre-works condition assessment

A detailed condition assessment of your transformer is achieved through high voltage testing, an internal inspection, and an inspection of the protection devices, control system, radiators and accessories. The delivery of this stage will be a preliminary report highlighting the condition of the transformer and any additional works required including the supply of parts or accessories.

Refurbishment works

The condition assessment determines the series of maintenance activities necessary to bring the transformer to a serviceable condition.

These works can include:

-          Partial or complete gasket replacement

-          On Load Tap Changer (OLTC) or De-Energised Tap Changer (DETC) maintenance

-          Painting of the transformer tank and accessories

-          Oil processing and regeneration

-          Reassembly of the transformer, including HV bushings and conservator tank

-          Supply and installation of on-line Dissolved Gas Analysis (DGA) monitoring systems

-          Oil Temperature Indicator (OTI) and Winding Temperature Indicator (WTI) calibration

-          Functional testing of the control system

-          Electrical high voltage testing to qualify the condition of the unit post refurbishment

-          Witnessing of Site Acceptance Testing (SAT) and commissioning testing

Achieving Engineering Excellence

TxMonitor® makes a considerable effort to address key issues and challenges that are critical to the successful completion of an onsite refurbishment project:

Occupational Health and safety (OH&S)

TxMonitor® is committed to complying with all local government acts and regulations, applicable Codes of Practice, Australian and New Zealand Standards.

TxMonitor® employees and certified subcontractors are qualified trades personnel and engineers who have undergone specialised training to conduct refurbishment works safely.

In March 2017, TxMonitor® was proud to celebrate five years of continuous operations without a Loss Time Injury (LTI).


TxMonitor® is committed to the preservation of the environment and we adhere to our environmental policy in all aspects and at all stages of our business operations.


TxMonitor® is committed to exceeding quality expectations, starting with a strong focus on the requirements stipulated in ISO 9001 as part of our processes for achieving business excellence.

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