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Long term improvements of all power transformers insulating system characteristics

VIMAP PORTABLE - mobile unit for transformer oil dehydration

VIMAP PORTABLE is used in the purpose of on-site dehydration and filtration of transformer oil. It is ideal for use while the oil is in power transformer, in barrels, for new oil prior to filling into the transformer or to be used simply as a pump.

Designed in several standard sizes and configurations it is suitable for the whole range of power transformers size rates, oil quantities and customer needs.

Depending on specific customer requirements VIMAP PORTABLE custom and modular design allows us to combine different number of columns, their positions and sizes as well as to equip it with many optional components.


Operating Principle

The gear pump draws transformer oil from the lowest point of the tank or from the barrel and sends it through adsorbent and fine filter and returns it to the tank or barrel.


Oil Dehydration

Oil is dehydrated by means of granulated synthetic adsorbents which attract water molecules and permanently hold them in the pores of their active surface.


Scope of Supply

» Mobile trolley or frame

» Control box with frequency converter and motor starter

» Flexible hoses (2 x 5 m)


Options

» Additional safety features for on-load operation while the power transformer is energized (please contact us for details)

» Moisture transmitter for measurement of water content in the oil and adsorbent saturation


Main features

» No oil heating

» No oil vacuuming

» No antioxidant additives removing

» No dissolved gasses removing

Specification

IEC 60296

IEC 60422

Voltage (HV)

–

<72.5

72.5 to 170

>170

Water content

ppm (mg/kg)

Max. 30 (bulk supply)

Max. 40 (drums or IBC)

Max. 20

Max. 10

Max. 10

Breakdown voltage (kV)

Min. 30

Min. 55

Min. 60

Min. 60


New oil is not dry oil

Specification for unused oil IEC 60296, Fluids for electro technical applications – Unused mineral insulating oils for transformers and switchgear, calls for unused oil, as received in bulk from the supplier, to have a minimum dielectric breakdown voltage value of 30 kV (120 kV/cm).


Dielectric breakdown voltage is also addressed in IEC 60422, Mineral Insulating Oils In Electrical Equipment – Supervision and Maintenance Guide. For new oil in new equipment after filling but prior to energizing, the Standard lists acceptable values for dielectric breakdown voltage as indicated in this table:

VIMAP-6 PORTABLE Dehydration Characteristics

Oil Characteristics

Unit

Before

Pass No.1

Pass No. 2

Pass No. 3

Water Content

ppm

100

<20

<7

<5

Dielectric strength

KV/cm (kV)

80 (20)

160 (40)

240 (60)

>280 (70)

VIMAP-6 PORTABLE Technical Specification

Type

Flow

Power consumption

Dimensions

Adsorbent capacity (without replacement)*

Weight

Lit/h

kW

mm

Kg (oil)

kg

VIMAP-6

600

0,55

594x878x491

80000

110

* The average quantity of oil in kilograms which can be dehydrated without replacement of adsorbent cartridges, provided that there is no inlet of free water and tar into the device. Free water or tar draining from the bottom of tanks or transformers required. Replacement of cartridge with saturated adsorbent is done simply by means of quick release couplings. Device manual contains everything you need for easy operation and maintenance


** Other sizes available on request.


Adsorbents saturation

Level of adsorbents saturation is monitored by moisture sensors. Comparing inlet and outlet moisture content readings it is easy to determinate efficiency of adsorbents. When the columns are saturated, i.e. when the input ppm is very close to being the same as the output ppm, then the columns can be exchanged.

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VIMAP PORTABLE - brochure

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