Industry

Vacuum pumps for the electrical industry

Transformers, instrument transformers, bushings, transformer oil, capacitors and SF6 switchgear are dried under vacuum ā€“ this is how Leybold describes the electrical industry: vacuum removes moisture from the insulation, degasses oil and casting resin and removes air and traces of water before SF6 filling. Leybold is the only one of our manufacturers that names this industry, with SOGEVAC, RUVAC, SCREWLINE, DRYVAC and VARODRY. Below you can see which series the manufacturers themselves name for these tasks ā€“ 77 models from 1 manufacturers.

Compare 77 modelsSee the applications

  • 77Models
  • 7Series
  • 1Manufacturers
  • 4Applications
Operating principle of an oil-lubricated rotary vane vacuum pump ā€“ the technology with the most models on this page. To the technology page

In short

Electrical industry (transformers, cables, switchgear): vacuum pumps ā€“ the key facts

  • A few ppmIn the manufacture of power capacitors, according to Leybold, vacuum drying and vacuum impregnation reduce the moisture to a few ppm ā€“ Leybold names DRYVAC with RUVAC WH/WSU.
  • Drying under vacuumLeybold names transformers, instrument transformers, bushings, transformer oil, capacitors and SF6 switchgear as components that are dried under vacuum.
  • Dry or oil-sealedLeybold names both routes: oil-sealed rotary vane vacuum pumps (SOGEVAC, TRIVAC) with RUVAC Roots pumps, and the dry screw vacuum pumps DRYVAC, SCREWLINE and VARODRY.
  • SF6 fillingBefore circuit breakers are filled with SF6, according to Leybold, air and traces of water are removed ā€“ with SOGEVAC B, TRIVAC B, Roots pumps or VARODRY.

Applications

Electrical industry (transformers, cables, switchgear): what vacuum pumps are used for

For each application: what the vacuum does and which series the manufacturers name for it. The information comes from the manufacturersā€™ own pages.

Power transformers: vapour phase drying

In the manufacture of power transformers, vacuum removes moisture from the insulation; for vapour phase drying Leybold names DRYVAC and SCREWLINE as well as oil-sealed rotary vane vacuum pumps.

More on Power transformers: vapour phase drying ā†’

Power capacitors: drying and impregnation

According to Leybold, vacuum drying and vacuum impregnation reduce the moisture in power capacitors to a few ppm. Leybold names DRYVAC in combination with the RUVAC WH/WSU Roots pumps.

  • LeyboldDRYVAC Leybold also names RUVAC WH/WSU; the series list on this page has only RUVAC WA/WAU

More on Power capacitors: drying and impregnation ā†’

Instrument transformers, distribution transformers and insulating bushings

When instrument transformers, distribution transformers and insulating bushings are impregnated and cast, according to Leybold, they are dried, degassed and freed of bubbles. Leybold names VARODRY, DRYVAC and SCREWLINE with RUVAC WH/WSU as well as SOGEVAC.

More on Instrument transformers, distribution transformers and insulating bushings ā†’

Transformer oil and SF6 switchgear

According to Leybold, transformer oil is dried and degassed under vacuum ā€“ with oil-sealed rotary vane vacuum pumps and Roots pumps or with VARODRY and SCREWLINE. Before circuit breakers are filled with SF6, vacuum removes air and traces of water; for this Leybold names SOGEVAC B, TRIVAC B, Roots pumps and VARODRY.

More on Transformer oil and SF6 switchgear ā†’

Manufacturers and series

Electrical industry (transformers, cables, switchgear): 1 manufacturers, 7 series

Listed are the series the manufacturer itself names for this industry. ā€œShow only ā€¦ā€ sets the filter of the product overview.

Product overview

Electrical industry (transformers, cables, switchgear): all 77 models compared

Use the filters on the left to narrow the selection ā€“ by manufacturer, technology and the modelsā€™ key figures, for 50 or 60 Hz.

DRYVAC series 9 models

DRYVAC DV 200Pumping speed 210 mĀ³/h 50 Hz210 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 7.5 kW 50 Hz7.5 kW 60 HzVariants 4
DRYVAC DV 300Pumping speed 280 mĀ³/h 50 Hz280 mĀ³/h 60 HzUltimate pressure 0.01 mbarRated motor power 7.5 kW 50 Hz7.5 kW 60 HzVariants 4
DRYVAC DV 500Pumping speed 380 ā€“ 460 mĀ³/h 50 Hz380 ā€“ 460 mĀ³/h 60 HzUltimate pressure 0.01 ā€“ 0.05 mbarRated motor power 11 kW 50 Hz11 kW 60 HzVariants 5
DRYVAC DV 650Pumping speed 650 mĀ³/h 50 Hz650 mĀ³/h 60 HzUltimate pressure 5 Ɨ 10-3 mbarRated motor power 15 kW 50 Hz15 kW 60 HzVariants 33
DRYVAC DV 650 FPPumping speed 650 mĀ³/h 50 Hz650 mĀ³/h 60 HzUltimate pressure 5 Ɨ 10-3 mbarRated motor power 15 kW 50 Hz15 kW 60 HzVariants 8
DRYVAC DV 800Pumping speed 800 mĀ³/h 50 Hz800 mĀ³/h 60 HzUltimate pressure 5 Ɨ 10-3 mbarRated motor power 19.6 kW 50 Hz19.6 kW 60 HzVariants 11
DRYVAC DV 800 FP-rPumping speed 800 mĀ³/h 50 Hz800 mĀ³/h 60 HzUltimate pressure 5 Ɨ 10-3 mbarRated motor power 19.6 kW 50 Hz19.6 kW 60 HzVariants 4
DRYVAC DV 1200Pumping speed 1,250 mĀ³/h 50 Hz1,250 mĀ³/h 60 HzUltimate pressure 5 Ɨ 10-3 mbarRated motor power 30 kW 50 Hz30 kW 60 HzVariants 3
DRYVAC DV 1600Pumping speed 1,600 mĀ³/h 50 Hz1,600 mĀ³/h 60 HzUltimate pressure 5 Ɨ 10-3 mbarRated motor power 39.2 kW 50 Hz39.2 kW 60 HzVariants 1

RUVAC WA/WAU series 8 models

RUVAC WA 251Pumping speed 210 mĀ³/h 50 Hz251 mĀ³/h 60 HzUltimate pressure 8 Ɨ 10-4 mbarRated motor power 1.1 kW 50 Hz1.1 kW 60 HzVariants 3
RUVAC WAU 251Pumping speed 210 mĀ³/h 50 Hz251 mĀ³/h 60 HzUltimate pressure 8 Ɨ 10-4 mbarRated motor power 1.1 kW 50 Hz1.1 kW 60 HzVariants 5
RUVAC WA 501Pumping speed 410 mĀ³/h 50 Hz530 mĀ³/h 60 HzUltimate pressure 0.04 mbarRated motor power 2.2 kW 50 Hz2.2 kW 60 HzVariants 4
RUVAC WAU 501Pumping speed 410 mĀ³/h 50 Hz530 mĀ³/h 60 HzUltimate pressure 0.04 mbarRated motor power 2.2 kW 50 Hz2.2 kW 60 HzVariants 6
RUVAC WA 1001Pumping speed 800 mĀ³/h 50 Hz1,000 mĀ³/h 60 HzUltimate pressure 0.04 mbarRated motor power 4 kW 50 Hz4 kW 60 HzVariants 3
RUVAC WAU 1001Pumping speed 800 mĀ³/h 50 Hz1,000 mĀ³/h 60 HzUltimate pressure 0.04 mbarRated motor power 4 kW 50 Hz4 kW 60 HzVariants 6
RUVAC WA 2001Pumping speed 1,850 mĀ³/h 50 Hz2,100 mĀ³/h 60 HzUltimate pressure 0.04 mbarRated motor power 7.5 kW 50 Hz7.5 kW 60 HzVariants 3
RUVAC WAU 2001Pumping speed 1,850 mĀ³/h 50 Hz2,100 mĀ³/h 60 HzUltimate pressure 0.04 mbarRated motor power 7.5 kW 50 Hz7.5 kW 60 HzVariants 7

RUVAC WH/WHU series 7 models

RUVAC WH 700Pumping speed 620 mĀ³/h 50 Hz740 mĀ³/h 60 HzUltimate pressure Rated motor power 2.2 ā€“ 3.8 kW 50 Hz2.6 ā€“ 3.8 kW 60 HzVariants 9
RUVAC WH 2500Pumping speed 2,200 mĀ³/h 50 Hz2,500 mĀ³/h 60 HzUltimate pressure Rated motor power 6.2 ā€“ 11 kW 50 Hz7.4 ā€“ 11 kW 60 HzVariants 24
RUVAC WHU 2500Pumping speed 2,200 mĀ³/h 50 Hz2,500 mĀ³/h 60 HzUltimate pressure Rated motor power 6.2 kW 50 Hz7.4 kW 60 HzVariants 10
RUVAC WH 4400Pumping speed 3,300 mĀ³/h 50 Hz3,900 mĀ³/h 60 HzUltimate pressure Rated motor power 11 ā€“ 18.5 kW 50 Hz11 ā€“ 18.5 kW 60 HzVariants 14
RUVAC WHU 4400Pumping speed 3,300 mĀ³/h 50 Hz3,900 mĀ³/h 60 HzUltimate pressure Rated motor power 18.5 kW 50 Hz18.5 kW 60 HzVariants 7
RUVAC WH 7000Pumping speed 4,700 mĀ³/h 50 Hz5,300 mĀ³/h 60 HzUltimate pressure Rated motor power 11 ā€“ 18.5 kW 50 Hz11 ā€“ 18.5 kW 60 HzVariants 19
RUVAC WHU 7000Pumping speed 4,700 mĀ³/h 50 Hz5,300 mĀ³/h 60 HzUltimate pressure Rated motor power 18.5 kW 50 Hz18.5 kW 60 HzVariants 3

RUVAC WS/WSU series 8 models

SCREWLINE series 2 models

SOGEVAC series 23 models

TRIVAC series 20 models

Model comparison

Models a manufacturer no longer carries in its current range are listed in its ā€œOutdated modelsā€ section.

Selection

Electrical industry (transformers, cables, switchgear): choosing a vacuum pump

What the manufacturers highlight for use in this industry.

Water vapour

All the tasks named remove moisture ā€“ from insulation, oil or casting resin. For this Leybold names both dry screw vacuum pumps (DRYVAC, SCREWLINE, VARODRY) and oil-sealed rotary vane vacuum pumps (SOGEVAC, TRIVAC).

Roots pumps as boosters

For capacitors Leybold names DRYVAC with RUVAC WH/WSU, for transformer oil oil-sealed rotary vane pumps with Roots pumps, for SF6 filling Roots pumps ā€“ as boosters ahead of the backing pump.

Our range

Of Leyboldā€™s list for the electrical industry, SOGEVAC, DRYVAC, RUVAC WA/WAU and SCREWLINE are in our range; Leybold also names VARODRY, pump systems and leak detectors.

Frequently asked questions

Electrical industry (transformers, cables, switchgear): frequently asked questions about vacuum pumps

Which vacuum pump for transformer drying?

For the vapour phase drying of power transformers Leybold names DRYVAC and SCREWLINE as well as oil-sealed rotary vane vacuum pumps; the vacuum removes moisture from the insulation. For distribution transformers, instrument transformers and insulating bushings Leybold additionally names VARODRY, RUVAC WH/WSU and SOGEVAC.

How does the vacuum drying of transformers work?

According to Leybold, the vacuum removes moisture from the insulation during vapour phase drying. Under vacuum, water evaporates even at a low temperature, and the pumps remove the vapour. Leybold names DRYVAC, SCREWLINE and oil-sealed rotary vane vacuum pumps.

Which vacuum pump for capacitor manufacturing?

For the manufacture of power capacitors Leybold names DRYVAC with RUVAC WH/WSU; according to Leybold, vacuum drying and vacuum impregnation reduce the moisture to a few ppm.

Which vacuum pump for degassing transformer oil?

According to Leybold, transformer oil is dried and degassed under vacuum; Leybold names oil-sealed rotary vane vacuum pumps with Roots pumps as well as VARODRY and SCREWLINE.

Why is the equipment evacuated before SF6 filling?

Before circuit breakers are filled with SF6, according to Leybold, air and traces of water are removed. Leybold names SOGEVAC B, TRIVAC B, Roots pumps and VARODRY.

Which pump for instrument transformers and potting resin?

When instrument transformers, distribution transformers and insulating bushings are impregnated and cast, according to Leybold, they are dried, degassed and freed of bubbles; Leybold names VARODRY, DRYVAC and SCREWLINE with RUVAC WH/WSU as well as SOGEVAC.

Dry or oil-sealed for transformers and transformer oil?

For the electrical industry Leybold names both designs: dry screw vacuum pumps (DRYVAC, SCREWLINE, VARODRY) and oil-sealed rotary vane vacuum pumps (SOGEVAC, TRIVAC), each also with RUVAC Roots pumps. For vapour phase drying and transformer oil treatment Leybold names both routes side by side.

Which Leybold series for the electrical industry are available from Ehrler & Beck?

SOGEVAC, DRYVAC, RUVAC WA/WAU, WS/WSU and WH/WHU, and SCREWLINE; Leybold names TRIVAC for SF6 filling. Leybold also names VARODRY, pump systems and leak detectors; they are not listed here.

Does Ehrler & Beck also supply spare parts and service?

Yes. Ehrler & Beck offers original spare parts and accessories as well as maintenance and repair.

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