Oil treatment plants with fuller’s earth for the eletric sector

Mineral insulating oil is a mixture of hydrocarbons with a predominantly paraffinic, naphthenic or aromatic base, deriving mainly from the distillation and refining of crude oil …

The oil obtained can then be added and / or blended (mixed) for specific applications.

Oil recovery and recycling is a common operational practice in several countries. In order to meet this requirement from a regulatory point of view, the IEC has formalized the IEC 62701 standard, canceled in February 2015 and subsequently taken into consideration (January 2016) in terms of merger with the 60296 ed. 4 by decision of the IEC SMB (standardization management board). According to these guidelines, new mineral-based insulating oils will not only be those classified as “virgin” but also “recycled” ones.

In this scenario, the management of the life cycle of oils with different characteristics creates much more complex situations (eg: in the formalization phases of the requirements for the purchase and acceptance of supplies).

In order to prevent catastrophic failures related to particular criticality of electrical equipment with insulating fluids, Brizio Basi has developed the OILVision analysis and diagnosis service.

In fact, similarly to what happens in clinical diagnostics, it is possible to monitor the health of the transformers through the analysis of an oil sample present inside them and the subsequent diagnosis.

In presence of corrosive oils Brizio Basi realizes selective Depolarization from corrosive sulfur.

Our solution is effective, economical and definitive because it eliminates the cause of the problem, this means removing from the oil both the DBDS and the other corrosive sulfur compounds (DBDS <10 mg / Kg). At the same time, the Depolarisation by Brizio Basi restores the functional properties of the oil in accordance with the IEC 60422 Ed. 4-2013, CIGRE 378 – 2009 art. 4.2.

The selective Depolarization employs:

• treatment plants made internally called DMU (Decontamination Modular Unit),
• patented reagents without which the treatment would not have the same efficacy
• a unique operating method since it is carried out on site and in a closed circuit, this means that the transformer is not even partially emptied
• adequate safety procedures also for the “On-Load” mode, this means that the transformer can be kept in service and under load for the entire duration of the treatment.
• highly qualified operating personnel

Operating modes

The extraordinary results of the Brizio Basi interventions are the product of the experience gained since 1960, the use of modular decontamination units, designed and built internally, and the formulation of specific reagents used based on the different operational scenarios.

Our DOV machines are connected to the transformer with flexible pipes, after which the decontamination processes are started: the insulating fluid circulates through where it is heated, degassed, dehumidified, filtered, depolarized and then returned to the transformer, which is never emptied, even partially.

The continuous circulation of the insulating liquid creates a constant flow of the fluid in the transformer that favors the elimination of the deposits on the cartogens and in the case.

The activities are carried out safely thanks:

• at low process temperatures,
• to the use of patented reagents that do not cause danger of explosion or fire,
• to the use of special pipes (hoses control) able to interrupt the process in case of accidental leaks and also thanks
• to a software control system capable of checking instant by instant that the process takes place safely and under guarantee of quality, 24 hours a day even without the presence of an operator thanks to the GSM systems with which our machines are equipped

The interventions are carried out with the On-Load option keeping the transformer in service, live and under load ie without any loss of production (international experiences also in nuclear power plants and on transformers of any power and voltage).