Transformer Winding Resistance Meters

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ISO 9001:2008 Certified

LTCA-10

Load Tap Changer Analyzer

Part Number(s)

9033-UC

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The LTCA-10 Analyzer is a second generation load tap changer analyzer. The LTCA-10 accurately measures winding resistance of highly inductive power transformers. Triple resistance-reading channels allow the measurement of three winding resistances simultaneously. Four-wire (Kelvin) connections provide high accuracy and require no lead compensation. A special feature of this device is its ability to measure and graph the resistance trace of a transformer LTC during operation. Using a 60Vdc power supply, the LTCA-10 is capable of outputting 10 amperes.

Auto discharge circuit for operator safety
3 resistance reading channels including one dynamic channel
Digital resistance reading from 1 micro-ohm to 500 ohms
Calculate equivalent resistance value at reference temperature
Stores 50 static records and 20 dynamic records
Built-in 4.5-inch thermal printer
Weighs less than 44 lbs.

LTCA-40

Load Tap Changer Analyzer

Part Number(s)

9059-UC

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The LTCA-40 Analyzer is a second generation load tap changer analyzer. The LTCA-40 accurately measures winding resistance of highly inductive power transformers. Triple resistance-reading channels allow the measurement of three winding resistances simultaneously. Four-wire (Kelvin) connections provide high accuracy and require no lead compensation. A special feature of this device is its ability to measure and graph the resistance trace of a transformer LTC during operation. Using a 60Vdc power supply, the LTCA-40 is capable of outputting 40 amperes.

Auto discharge circuit for operator safety
3 resistance reading channels including one dynamic channel
Digital resistance reading from 1 micro-ohm to 500 ohms
Calculate equivalent resistance value at reference temperature
Stores 50 static records and 20 dynamic records
Built-in 4.5-inch thermal printer
Weighs less than 44 lbs.

TRM-20

Transformer Winding Resistance Meter

	Part Number(s) 9007-UC View Full Specs
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.	Auto-discharge circuit for operator safety Demagnetizes transformer after test Selectable test current from 1A to 20A RS-232C, USB, and Bluetooth computer interfaces Built-in thermal printer

TRM-203

Transformer Resistance Meter

Part Number(s)

9060-UC

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The TRM-203 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-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 20A.

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 20A
Computer control via RS-232C, USB, or Bluetooth interface
Built-in 2.5" wide thermal printer

TRM-40

Transformer Winding Resistance Meter

	Part Number(s) 9061-UC View Full Specs
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.	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

TRM-403

Transformer Resistance Meter

Part Number(s)

9006-UC

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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.

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

TSB

Trip Saver Box

Part Number(s)

9062-UC

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The Vanguard TSB can be used with a Vanguard ATRT-03 series turns ratio tester to perform transformer turns ratio tests using the same cable set provided with the TRM-203/403. Using the TSB, there is no need to connect and reconnect cables from the transformer after the initial connections are made. The user can conveniently perform resistance tests using the TRM-203/403 and turns ratio tests using an ATRT-03 without having to make trips to the transformer to connect and disconnect cables.

WRM-10P

Winding Resistance Ohmmeter

	Part Number(s) 9056-UC [110V] 9057-UC [220V] View Full Specs
The WRM-10P is a low resistance ohmmeter with all of the features of the WRM-10 above. In addition to the features of the WRM-10, the WRM-10P includes a built-in 2.5" wide thermal printer that allows test records to be printed in the field. Test records can also be downloaded to a PC.	Range from 1 micro-ohm to 2,000 ohm Up to 10 Amperes of test current Auto discharge circuit for operator safety Built-in 2.5" Thermal Printer, computer interface Stores 48 records of 63 readings Weighs less than 27 lbs.


Field Pictures

TNB ATRT/WRM Training and Delivery TRM-203 in Malaysia TRM-203 Testing on 200MVA Transformer TRM-403 Testing at Elecktromak, Turkey TRM-403 Testing in Malaysia