Dynamic Resistance Testing with the Vanguard LTCA-40

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Vanguard-ltca-40A special feature of the Vanguard LTCA-40 Load Tap Changer Analyzer is its ability to measure and graph the resistance trace of a transformer LTC during operation. Four-wire (Kelvin) connections provide high accuracy and require no lead compensation. Using a 60Vdc power supply, the Vanguard LTCA-40 is capable of outputting 40 amperes.

Vanguard LTCA-40 Dynamic Resistance Test


One resistance reading channel is dedicated to dynamic resistance testing. This test can monitor the LTC voltage regulator contact resistance during operation. A resistance graph, plotting resistance over time, can be printed on the built in thermal printer and is very useful for detecting LTC voltage regulator contact problems.

Built-in Thermal Printer

The built-in 4.5-inch wide thermal printer can print the breaker contact analysis results in both tabular and graphic formats.

User Interface

The LTCA-40 features a back-lit LCD screen (128 x 64 pixels) that is viewable in both bright sunlight and low-light levels. A rugged, alphanumeric, membrane keypad is used to control the unit.

Internal Test Record Storage

The LTCA-40 can store 128 static test records (48 tests per record) and 11 dynamic resistance test records in Flash EEPROM. Test records can be recalled locally or transferred to a PC via the available interfaces (RS-232C port, USB port, USB Flash drive port).

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