Our Diagnostic services, maintenance,
and repair of transformers
Services Our Services Diagnostic services, maintenance,
and repair of transformers

RYMEL Services

Transformer Repair

Rymel, in addition to being a transformer manufacturer, also provides transformer diagnostic, maintenance and repair services. The activities offered related to each service are described below: 

• Repair, manufacture, or modification of one or more coils in both dry and oil transformers 
• Voltage modification in both low and medium voltage. 
• Repair and/or modification of the tank

Transformers maintenance in our facilities

  • Washing and heating of the active part
  • Dielectric oil change
  • Change of seals
  • Cleaning of tanks by mechanical or chemical attack.
  • Tank painting
  • Routine Electrical Tests
  • Type Electrical Tests (optional)
  • Electrical test protocol
  • Instrumentation review
In addition, in our product portfolio, we offer several electrical tests that are part of our diagnostic, repair, and maintenance services, which are mentioned below.
  • Transformation relation
  • Insulation Resistance
  • Winding resistance
  • Transformer maintenance vacuum test in plant 1
  • Short circuit test
  • Applied stress test
  • Induced voltage test
  • Impulse Test
  • Partial discharge test
  • FRA frequency response analysis
  • Power factor test

On site Transformers Maintenance

Rymel, in addition to providing diagnostic and maintenance services at its facilities, also provides this service on-site. The services provided are described below:
• Washing of the transformer and the cell with a pressure washer.

  • Blowing and vacuuming the elements that make up the measurement and power cells. Washing of cell doors and covers. 
  • Correction of transformer oil leaks. 
  • Change of seals
  • Change of low and high-voltage insulators and fittings. 
  • Review and change of measurement and control elements of power transformers. 
  • Electrical tests. 
  • Aspirated and blown with Nitrogen to the dry transformers.

Energy Substations maintenance up to 44KV

Preventive maintenance in a substation is done with the objective of detecting failures that may affect its proper functioning since a substation is a fundamental part of an industry and a stoppage in production can generate high financial losses.

Maintenance in an electrical substation consists of:

• Physical review of the structures and each of the components that make it up.

• General cleaning.

• Lubrication of mechanical components.

• Adjustment of connections.

• Mechanical, electrical and dielectric tests.

Transformers Electrical Tests on-site and in our facility

Rymel currently has a wide portfolio of electrical tests to offer our clients the best advice and diagnosis of their equipment. The electrical tests performed are described below.


  • Transformation ratio 
    • Insulation resistance 
  • Winding resistance 
    • Vacuum test 
  • Short circuit test 
  • Applied voltage test 
  • Induced voltage test 
    • Impulse test 
    • Partial discharge test 
  • Frequency response analysis FRA 
    • Test of power factor

Mineral and Vegetable dielectric oil Physicochemical analysis

As we well know, the dielectric oil is a fundamental part of the useful life of the transformer, therefore, it is of great importance to know its condition and thus anticipate a possible failure in the future, therefore, Rymel offers the following services of diagnosis for dielectric oil: 

  • Dielectric breakdown voltage (ASTM D877). 
    • Neutralization number (ASTM D974). 
    • Interfacial tension (ASTM D2285). 
    • Color (ASTM D1500). 
    • Relative density (ASTM D1298). 
    • Moisture in PPM (ASTM D1533). 
    • Quality index

Thermography service

Thermography is a technique with which temperature measurements can be made without contact and at a distance, and at the same time, it allows for visualizing images, which are formed by the source of infrared radiation. 

Applications of thermography in industrial preventive maintenance, this technique is applicable for: 
• High and low voltage lines. 
• Control and power cabinets. 
• Electrical splices, hot spots. 
• Distribution and power transformers. 
• Electric motors