• Sales & Support 01952 290880
  • enquiries@btracuk.com

OLTC

For about 80 years now we have been manufacturing on-load tap-changers and we still keep coming up with epoch-making innovations.

The VACUTAP® series, just one example, with its vacuum switching technology for on-load tap-changers in oil-immersed and dry-type transformers. This is now the most common form of technology in reactor-type tap-changers and has revolutionised resistor-type tap-changers. We have been using this technology since the 1980´s and are continuously refining it thus bringing you advantages such as no service requirements before 150,000 to 500,000 switching operations, drastically reduced running costs for the whole physical life, increased availability of the transformer, no oil carbonization, no replacement of contacts and no oil filter systems - to mention but a few of the many benefits.

To a great extent the OILTAP® - program with its conventional tap-changer technology (arcing contacts in oil) and already well-known to you, is still available as an alternative.

VACUTAP® VM® VV® VR® VT® AVT RMV-II
Max. rated through-current (1-phase) 1500 A 400 A 1,600 respectively 2,600 A * 500 A - -
Max. rated through-current (3-phase) 650 A 600 A 1,300 A 500 A 170 A 1500 /
2000 /
2500 A
Max. rated step voltage 3300 V 2000 V 4000 V 900 V 500 V 2000 V
Max. rated switching capacity (1- / 3-phase) 3500 / 1625 kVA 700 kVA 3000 kVA 250 kVA 75 kVA  
Highest voltage for equipment Um 72,5 - 300 kV 40 - 145 kV 72,5 - 362 kV 40,5 kV 11,5 kV 70 kV
Application at neutral point (three-phase) or at any selectable winding position:
Operating positions without change-over selector max. 22 max. 12 max. 18 max. 9 max. 9 max. 17
Operating positions with change-over selector max. 35 max. 23 max. 35     max. 33
* with enforced current splitting of the transformer winding


OILTAP® V MS M R G RM
Max. rated through-current (1- / 3-phase) 200 / 400 A 300 A 1500 / 600 A 3000 /
1200 A
2000 A 1500 / 600 A
Max. rated step voltage 1500 V 3300 V 3300 V 4000 V 5000 V 4000 V
Max. rated switching capacity (1- / 3-phase 525 kVA 1000 kVA 3500 kVA 6000 / 3000 kVA 5000 kVA 4280 / 2400 kVA
Highest voltage for equipment Um 40 - 123 kV 72,5 - 245 kV 72,5 - 300 kV 72,5 - 362 kV 72,5 - 362 kV 72,5 - 300 kV
Application at neutral point (three-phase) or at any selectable winding position:
Operating positions without change-over selector max. 14 max. 14 max. 22 max. 18 max. 18 max. 18
Operating positions with change-over selector max. 27 max. 27 max. 35 max. 35 max. 35 max. 35

VACUTAP® VV®

On-load tap-changer for network applications.   YOUR BENEFITS AT A GLANCE Maintenance-free up to 300,000 tap-change operations with no time component Change of vacuum interrupters only after 600,000 tap-change operations Change of the diverter switch insert only after 1.2 million tap-change operations Intended for selected alternative insulation fluids Intended for... view more

VACUTAP® VM®

Your benefits at a glance Arc-Control System® Extinguishes the arc with absolute reliability Step Protection System® Maximum protection of the diverter switch from overloads Interrupter Exchange Module Reduction of maintenance-dependent loss of production Retrofittable diverter switch insert Retrofittable: the VACUTAP® VM® diverter switch insert Benefits VACUTAP® technology combines maximum reliability... view more

VACUTAP® VR®

The VACUTAP® VR® type family offers a real alternative to the on-load tap-changers from our extensive OILTAP® R/RM and M program.   Your benefits at a glance • Maintenance-free up to 300,000 tap-change operations with no time component. The figure for the VR I HD is 600,000 tap-change operations. •... view more

VACUTAP® VT®

The on-load tap-changer VACUTAP® VT® with vacuum interrupters serves for setting the ratio of dry-type transformers under load.   Your benefits at a glance Electrical lifetime of 500,000 tap-change operations< Mechanical lifetime of 800,000 tap-change operations Simple to install Technical Data Max. rated through-current single-phase / three-phase: 500 A Max.... view more

VACUTAP® AVT

Compact, three-phase on-load tap-changer for voltage regulation of dry-type transformers Your benefits at a glance Integrated voltage regulator and motor-drive unit Simple handling Moving parts encapsulated to protect against contact Technical Data Max. rated through-current 170 A Max. rated step voltage 500 V Max. rated switching capacity 75 kVA Max.... view more

VACUTAP® RMV-II

On-load tap-changer in reactor technology Your benefits at a glance Compact design Maintenance-free for up to 500,000 tap-change operations with no time component (applies only to the version with model B monitoring system) Quick switching times Internal oil heating system for use in arctic conditions RMT use as a retrofit... view more

OILTAP® V

On-load tap-changer for nearly all network applications Your benefits at a glance Extremely compact design Convenient removal of the diverter switch insert makes maintenance easy Field experience: over 35,000 in use worldwide Technical Data Max. rated through-current (three-phase) 200 / 400 A Max. rated step voltage 1,500 V Max. rated... view more

OILTAP® MS

A 300A on-load tap-changer for tapped transformers with medium output rates. Your benefits at a glance Field experience: Over 14,000 in use Technical Data Max. rated through-current 300 A Max. rated step voltage 3,300 V Max. rated switching capacity 1,000 kVA Max. voltage for operational equipment Um 72.5-245 kV Application... view more

OILTAP® MSE - Retrofitkit

Your benefits at a glance The 340 A on-load tap-changer with a special adapter head to replace a Bulgarian on-load tap-changer of type RS3, RS4 or RS9. Technical Data Max. rated through-current (three-phase) 340 A Max. rated step voltage 3.300 V Max. rated switching capacity (three-phase) 1.000 kVA Application: Star... view more

OILTAP® M

On-load tap-changer for network or generator operation, electric arc furnaces, HVDC, electrolysis, inverters, phase shifters and auto transformers Your benefits at a glance Convenient removal of the diverter switch insert makes maintenance easy available with multiple coarse change-over selector Field experience: over 65,000 in use worldwide Braided contact leads designed... view more

OILTAP® RM

The OILTAP® RM on-load tap-changer is composed of the R diverter switch and the M tap selector. Your benefits at a glance Convenient removal of the diverter switch insert makes maintenance easy Technical Data Max. rated through-current single-phase: 1,500 A Max. rated through-current three-phase: 600 A Max. rated step voltage... view more

OILTAP® R

The on-load tap-changer for the highest voltages and transformer output rates. Your benefits at a glance Field experience: Over 7,000 in use worldwide Technical Data Max. rated through-current single-phase: 3,000 A Max. rated through-current three-phase: 1,200 A Max. rated step voltage 4,000 V Max. rated switching capacity single-phase: 6,000 kVA... view more

OILTAP® G

The on-load tap-changer for power transformers with highest capacities. Your benefits at a glance Contacts for extreme polarity demands JEC inspected Field experience: Over 600 units in limit output transformers worldwide Technical Data Max. rated through-current single-phase / three-phase: 2,000 A Max. rated step voltage 5,000 V Max. rated switching... view more