Transformer Winding Resistance Meters

Transformer Winding Resistance Meters 2020-02-05T10:44:03+01:00

40 A three-phase winding resistance meter with demagnetization

MODEL: TRM-403

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The TRM-403 is a three phase transformer winding resistance meter that allow the user to connect all test cables to the transformer bushings. The unit will then measure the transformer resistance value for each of the phases without the need to disconnect and reconnect cables for each phase. The TRM-403 can provide a fast and stable reading of very large transformers by utilizing a 60Vdc power supply. It is capable of outputting a selectable test current from 1A to 40A. Since the TRM-403 can accurately measure resistance from 1 micro-ohm to 500 Ohms, it can be used as a micro-ohm meter to measure EHV circuit breaker contact resistance, or for any low resistance measuring application.

FEATURES & BENEFITS

  • Perform three phase test on a transformer without the need to switch cables
  • Can provide individual Delta winding resistance values
  • Can provide individual Wye (with no neutral) winding resistance values
  • Demagnetize transformer after test
  • Selectable test current from 1A to 40A
  • Computer control via RS-232C, USB, or Bluetooth interface
  • Built-in 2.5″ wide thermal printer
TECHNICAL SPECIFICATIONS

25 A three-phase winding resistance meter with demagnetization

MODEL: TRM-203

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The TRM-203 is a three phase transformer winding resistance meter that allows the user to connect all test cables to the transformer bushings. The unit will then measure the transformer resistance value for each of the phases without the need to disconnect and reconnect cables for each phase. The TRM-203 can provide a fast and stable reading of very large transformers by utilizing a 60Vdc power supply. It is capable of outputting a selectable test current from 1A to 25A. Since the TRM-203 can accurately measure resistance from 1 micro-ohm to 2000 Ohms, it can be used as a micro-ohm meter to measure EHV circuit breaker contact resistance, or for any low resistance measuring application.

FEATURES & BENEFITS

  • Perform three phase test on a transformer without the need to switch cables
  • Can provide individual Delta winding resistance values
  • Can provide individual Wye (with no neutral) winding resistance values
  • Demagnetize transformer after test
  • Selectable test current from 1A to 25A
  • Computer control via RS-232C, USB, or Bluetooth interface
  • Built-in 2.5″ wide thermal printer
TECHNICAL SPECIFICATIONS

Fast and stable reading of very large transformers

MODEL: TRM-40

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The TRM-40 is Vanguard Instruments’ third generation transformer winding resistance meter. The TRM-40 is designed specifically to measure DC resistance values of transformer windings, rotating machine windings, or any dc resistance of an inductive device.

FEATURES & BENEFITS

  • Auto-discharge circuit for operator safety
  • Demagnetizes transformer after test
  • Selectable test current from 1A to 40A
  • RS-232C, USB, and Bluetooth computer interfaces
  • Built-in thermal printer
TECHNICAL SPECIFICATIONS

MODEL: TRM 20

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The TRM-20 is Vanguard Instruments’ third generation transformer winding resistance meter. The TRM-20 is designed specifically to measure DC resistance values of transformer windings, rotating machine windings, or any dc resistance of an inductive device.

The TRM-20 features dual resistance-reading input channels that can measure two winding resistances simultaneously (primary and secondary windings of a transformer). It can provide a fast and stable reading of very large transformers by utilizing a 60Vdc power supply. The TRM-20 is capable of outputting a selectable test current from 1A to 25A.

Since the TRM-20 can accurately measure resistance values from 1 micro-ohm to 2,000 Ohms, it can be used as micro-ohm meters to measure EHV circuit breaker contact resistance, or for any low resistance measuring application. The TRM-20 can automatically demagnetize the inductive device under test, eliminating the manual task of demagnetizing the transformer core after a resistance test.

FEATURES & BENEFITS

  • Auto-discharge circuit for operator safety
  • Demagnetizes transformer after test
  • Selectable test current from 1A to 25A
  • RS-232C, USB, and Bluetooth computer interfaces
  • Built-in thermal printer
TECHNICAL SPECIFICATIONS

10 A single-phase winding resistance meter

MODEL: WRM-10P S2

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The WRM-10P S2 is Vanguard’s second generation lightweight winding resistance meter designed to accurately measure the winding resistance of highly inductive power transformers. The unit’s dual resistance-reading input channels can measure two winding resistances simultaneously, and four-wire (Kelvin) connections provide high accuracy and require no lead compensation. The WRM-10P S2 provides stable resistance readings of very large transformers by utilizing a 36Vdc power supply capable of outputting up to 10 Amperes. The resistance reading of a 100MVA transformer can be achieved in 5 minutes or less. The unit’s power supply is cooled by heavy-duty fans designed for continuous operation. For greater flexibility in the field, the WRM-10P S2 comes with a built-in 2.5″ wide thermal printer used for printing test reports.

FEATURES & BENEFITS

  • Auto discharge circuit for operator safety
  • Auto current ranging from 10 mA to 10 A
  • Digital resistance reading from 1 micro-ohm to 2,000 ohms
  • Stores 100 records (up to 64 readings each)
  • Built in 2.5″ wide thermal printer
  • Weighs less than 28 lbs.
TECHNICAL SPECIFICATIONS