remplissage Archives - Sea Marconi

Remplissage d’un transformateur sous vide et traitement d’huile Belgique 2014

seamarconi — Mon, 23 Nov 2015 15:31:14 +0000

Situation

A global leader in the energy sector

Technical specifications of transformer:

Manufacturer: xxx
Year: 2013 (new)
Power [MVA]: 185
Voltage [kV]: 380/150
Oil mass [kg]: 50.940

Problem

Transformer empty following transport to destination site.

Solution

Estratto del rapporto di prova con esiti analitici dell’olio a fine intervento

Sea Marconi implemented the following measures: Filling the transformer under vacuum and oil treatment

Details of stages in the procedure

connecting and preparing the transformer for vacuum (1 day)
applying the vacuum to the transformer (3 days)
filling under vacuum (2 days)
checking the conservator and purging
treating the oil by circulating it through the Sea Marconi decontamination unit (two and a half days)
sampling the oil for testing at the end of process
disconnecting and uninstalling the site
Total duration of the process: 8 days

This treatment was carried out by Sea Marconi in conjunction with the manufacturer of the transformer who installed the transformer at the destination site and assembled the accessories.

The post Remplissage d’un transformateur sous vide et traitement d’huile Belgique 2014 appeared first on Sea Marconi.

Remplissage d’un transformateur sous vide et traitement d’huile France 2013

seamarconi — Wed, 29 Jul 2015 09:27:38 +0000

Situation

Twin transformers installed in a quarry:

Manufacturer: xxx
Year: 1980
Power [MVA]: 250
Voltage [kV]: 400
Oil mass [kg]: 41,000

Problem

Following a problem associated with excessive gas formation diagnosed by another supplier, the latter asked Sea Marconi to drain the oil, keep the transformers under vacuum for a specified period, then refill them with oil and carry out oil treatment.

The procedure presented severe logistical constraints as the transformers were located in a quarry. Sea Marconi was able to exploit the modest size and modularity of its decontamination units for the oil treatment.

Sea Marconi solution

Sea Marconi implemented the following measures:Draining the oil from the transformer, refilling the transformer under vacuum and oil treatment

Details of stages in the process

Installation of the site and piping connections
draining and preparation of the transformer for vacuum
applying the vacuum to the transformer
keeping the transformer under vacuum
refilling under vacuum
checking the conservator and purging
treating the oil by circulating it through Sea Marconi decontamination units
sampling the oil for testing at the end of the process
disconnection and uninstalling the site

Criteria for terminating the treatment

The treatment was terminated when the following oil parameters were achieved (as agreed with the client)

water in the oil < 5mg/kg at 20°C (sampling by aspiration in the treatment unit);
oil dielectric strength > 60 kV;
amount of water extracted < 0.25 litre/24 hours;
temperature 70°C during the final treatment.

Details of treatment

Vacuum achieved:< 5 mBAR
Oil circulation flow rate:4000 l/h (T1), 4500 l/h (T2)
Average oil temperature at the top of the tank:74.3°C (T1), 74.4°C (T2)
Average oil temperature at the bottom of the tank:53°C (T1), 55°C (T2)
Extracted water:3.1 litres (T1), 2.5 litres (T2)
Dielectric strength:75.1 kV
Water content in oil:6mg/kg (T1), 7mg/kg (T2)

Duration of treatment: 3 days (T1) and 4 days (T2)

The post Remplissage d’un transformateur sous vide et traitement d’huile France 2013 appeared first on Sea Marconi.

Remplissage et déshydratation d’huile de transformateur France 2012

seamarconi — Fri, 12 Jun 2015 14:55:26 +0000

Situation

A global leader in the energy and infrastructure sector

Technical specifications of transformer:

Manufacturer: xxx
Year: 2012 (new)
Power [MVA]: 80
Voltage [kV]: 227/21/21
Oil mass [kg]: 26.700

Problem

Following an initial request to fill the new transformer, when the Sea Marconi technicians arrived they noticed there was free water inside the transformer.

This was due to the transformer not being properly sealed prior to transportation.

Solution

Sea Marconi carried out a rather complex operation in three separate stages:

Dehydration of the papers by the direct “hot oil + vacuum” drying technique
This phase involves applying a vacuum to the transformer tank, filling it with hot oil to cover the windings, draining the transformer rapidly and repeating the process until the established values are achieved (water < 10mg/kg; dielectric strength > 70kV; amount of water extracted < 0.25 litre/24 hours).
Refilling and treatment
This phase involves applying a vacuum to the transformer tank, filling it with oil and subsequent physical treatment of the vents

The process took just over two weeks, during which 2.85 litres of water was extracted from the oil/transformer system.

The post Remplissage et déshydratation d’huile de transformateur France 2012 appeared first on Sea Marconi.