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Condition Assessment

In a fast changing environment asset managers need to keep up with past challenges to produce, transmit, distribute and deliver electrical power in a reliable way. Ageing assets, rising energy demand and the need to deliver without unplanned outages, are some of the challenges utilities and industries are facing today around the world.

Fixing these challenges mean that new solutions are needed to maintain the installed base of assets as well as when refurbishing, repairing or upgrading legacy transformers. Since the late 90s, Hitachi Energy offers a modular three step approach to a Condition Based Maintenance or Reliability Centered Maintenance program:

Step 1. Fleet screening survey: A quick scan of a large population (20 to 200 units) collects easily accessible data, such as unit name plate data, oil and dissolved-gas-in-oil data, load profile, history of the unit and sister units.

Step 2. Condition assessment: At this stage, transformer design experts focus on a smaller number of units (10 to 20) identified in step 1. They use modern design rules and tools to evaluate the original design. Advanced diagnostic tests are performed to assess each of the principal properties of the transformer in a structured way. This assessment leads to an estimate of each transformer`s risk of failure and defines action plans to improve the reliability of each unit.

Step 3. Expertise: The number of units to be further analyzed is typically limited to two or three out of a population of 100 units. This third module of the assessment process provides accurate information with respect to overloading transformers, enhancing their performance (power or voltage increase) or extending their lifetime.

The video "Tailored service solutions for every transformer - Engineering solutions" presents our service offerings to assess the operational condition of transformers, provide recommendations to mitigate risks and enhance the performance of aged equipment to meet possible new requirements. It also provides state-of-the-art information on on-line monitoring solutions, maintenance and repair options to be used to ensure reliable operating conditions.

Engineering and Consulting Services

Why Hitachi Energy?

  • Based on extensive transformer experience, Hitachi Energy offers consultant services to support in crafting maintenance strategies based on the transformer fleet's health status.
  • Hitachi Energy's transformer service experts can provide assessment to define measures to be taken for lowering the risk of failure, lower operational costs and enhancing safety.
  • With our Condition Based Maintenance program, control maintenance costs can be optimized while achieving highly reliable power delivery.
  • Using the Mature Transformer Management Program (MTMP) units at Risk of Failure and units in need of further attention and actions, are singled out.
  • With screening, capital expenditure can be steered to units most in need, and the investment plan can be evaluated for different service options in a pre-set time frame (e.g., 2012 to 2042).

Scope of work

Mature Transformer Management Program (MTMP)

It is three steps approach which can be applied to a single or fleet of transformers, The steps include fleet screening, design and condition assessment and life assessment /profiling of the transformer fleet. The reports provide the condition and life assessment of the each transformer with recommendations for further action in order to minimize or eliminate risk of failures.

For more information on MTMP, please download the leaflet below:

Basic Diagnostics Testing Visual Inspection, Standard Oil Test (SOT), Dissolved Gas Analysis (DGA), Furan Analysis, Polychlorinated Biphenyl (PCB), Copper Sulphide (Cu2S), Standard and Special Tests
Advance Diagnostics Testing

Advanced Dissolved Gas Analysis (ADGA), Frequency Response Analysis (FRA), On-Load Tap Changer Vibration Diagnostic, Dielectric Frequency Response (DFR), Partial Discharge Analysis (PDA)

For more information on Advance Diagnostocs Testing, please download the leaflet below:


High voltage testing including applied and induce testing with Partial Discharge measurement on-site.

For more information on TrafoSiteTesting, please see links below:

Get to know more

Transformer service

Aging assets, rising energy demand and the critical need to avoid unplanned outages are challenging utilities and industrials around the world. Hitachi Energy is the largest transformer service organization, Global expertise close to our customers.
Hitachi Energy Power Transformers


Hitachi Energy offre trasformatori di distribuzione e di potenza, trasformatori a secco e a liquido, nonché servizi, da utilizzare in applicazioni di utilità, industriali e commerciali.

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