Interview with Julian Montero Head of Predictive and Corrective Maintenance for Power Transformers

Interview with Julian Montero Head of Predictive and Corrective Maintenance for Power Transformers

Vol. 8 issue 1

Victor Lozano, Sales & Application Engineer for OMICRON Spain talked to Julian Montero from i-DE, Spanish distribution system operator, part of IBERDROLA Group, one of the largest power utilities worldwide, about their power transformer maintenance and testing program.

Julian Montero has been responsible for the area of predictive and corrective maintenance within the Power Transformers standardization and maintenance department at I-DE (Group Iberdrola) since 2014. Previously he worked as a project engineer at Elecnor, Gamesa and Iberdrola Engineering, always related to the development of new HV lines and substations in Spain and Brazil.

 

Dear Mr. Montero, can you briefly explain your role at Iberdrola?

Our work within i-DE is related to the area of maintenance and standardization of Power Transformers. Internally, our group is called NMTP (Spanish acronym standing for Power Transformers Maintenance and Standardization).

This specialized group consists of ten people, divided into three main areas. The first team is responsible for the standardization of new transformers; then we have a team focused on transportation and relocation of transformers; and, finally, a team responsible for maintenance policies, which also leads any significant corrective maintenance. These three areas are coordinated, obviously.

Geographically, we are covering the area where i-DE operates in Spain, taking care of power transformers from 10 MVA up to 450 MVA, and voltage ratings ranging from 30 kV to 400 kV.

In addition to the people mentioned above, there are nine fieldwork teams assigned to the regional operation and maintenance units in five regions, making up a total of 24 people. These fieldwork teams check the proper operation of OLTCs (On Load Tap Changers) and perform electrical testing of the power transformers defined in both predictive and corrective maintenance programs.

Geographically, we are covering the area where i-DE operates in Spain, taking care of power transformers from 10 MVA up to 450 MVA, and voltage ratings ranging from 30 kV to 400 kV.

 

What are the most important tools that you are using for these tasks?

We are using diverse test equipment to carry out measurements such as Insulation Resistance (IR), Sweep Frequency Response Analysis (SFRA) and Dielectric Frequency Response (DFR) in order to evaluate the moisture content within the transformer. The main device that we use is the CPC 100, which we use to perform most of the tests.

 

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