• Auto discharge circuit for operator safety
• 3 resistance reading channels including one dynamic channel
• Digital resistance reading from 1 micro-ohm to 500 ohms
• 60Vdc power supply , outputting 40 amperes
• 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.

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.

Transformer Load Tap Changer

Control

Transformer tap positions can be changed remotely using

the unit’s built-in transformer load tap changer. This

remote-controlled tap changer feature eliminates the

need to manually change a transformer’s step-up and

step-down taps.

Built-in Safety Features

At the end of each test, the LTCA-40 automatically

dissipates the stored energy in the transformer.

This discharge circuit will continue to

work even if the supply voltage is lost.

AC Motor Current Monitoring

One AC current monitoring channel is dedicated

to monitoring the LTC voltage regulator motor

current during operation. The motor current is

also printed on the resistance graph and can

help detect LTC voltage regulator motor problems.

An AC clamp-on current sensor is provided

with the LTCA-40.

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.

Resistance Reading Features

Three resistance-reading channels can measure resistance

from 1 micro-ohm to 500 ohms, and the test current

is programmable (1A, 5A, 10A, 40A). The LTCA-40

can also be used to measure EHV circuit-breaker contact

resistance, motor winding resistance or any low resistance.

If the transformer winding temperature is entered,

the LTCA-40 can calculate the equivalent resistance

value of the winding material (aluminum or copper) at

any standard reference temperature. Also, a special test

mode can run a test for up to 45 minutes while saving

resistance readings at one-minute intervals.

Dynamic Resistance Test

Features

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 builtin

thermal printer and is very useful for detecting

LTC voltage regulator contact problems.

Part number LTCA-40 LTCA-40, cables, software

Part number LTCA-40 CASE LTCA-40 shipping case

Part number TP4 4.5-inch wide thermal printer paper