CMM-4/7: now in Finland

On May 31, 2017, the CMM-4/7 unit started its operation in Helsinki (Finland). First it serviced a 400 MVA transformer.

CMM-4/7 is a multifunctional unit  – it has three modes of operation:

  • First the unit warms up and then it starts processing oil in degassing mode. In this mode, the oil is heated to a set temperature, filtered, degassed in vacuum and passes through fine filtration at the exit;
  • The unit heats and filtrates oil in a vacuum column without degassing;
  • The unit diagnoses good condition and serviceability of all components (valves, pumps, etc.).

CMM-4/7 units are used in enterprises engaged in installation and repair of oil-filled high-voltage equipment in workshops and on-site. The processing rate of this unit in degassing mode is 4 m3 / h , and in  heating and filtration mode is 7 m3 / h.

Processed oil parameters:

  • Volumetric gas content – below 0.1%;
  • Moisture content by weight – below 10 g / t;
  • ISO 4406 industrial purity class  – / 14/12;
  • Mechanical impurities content – below 8 g / t;
  • Filtration fineness -5 μm.

The unit is connected to the transformer by TSS (Transformer Security System) to monitor the oil level and to protect the transformer from oil leaks or breaking of hoses.


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