LTCA-10 Load Tap Changer Analyzer

14 000,00 € tax incl.
VANGUARD
  • 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.

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.
The LTCA-10 is Vanguard’s transformer winding resistance meter and load tap changer contact analyzer. The LTCA-10 is designed to accurately measure the winding resistance of highly inductive power transformers. The unit’s triple
resistance-reading input channels can measure three winding resistances simultaneously.
Two-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 or voltage regulator contact
during operation. One resistance input channel is dedicated to this feature.
The LTCA-10 provides stable resistance readings of very large transformers by utilizing a 60 Vdc power supply capable of outputting at test current up to 10 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.
 
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). The LTCA-10 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-10 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 built in thermal printer and is very useful for detecting
LTC voltage regulator contact problems.
 
LTCA-10 specifications
type load tap changer analyzer
physical specifi cations 21”W x 17”H x 9” D (53 cm x 43 cm x 24 cm); Weight: 33 lbs (15.4 kg)
operating voltage 100 ¬ 240 Vac, 50/60 Hz
resistance reading range 1 micro-ohm - 500 ohms
accuracy 1 ¬ 19,999 micro-ohms: ±0.5% reading, ±1 count;
20 ¬ 999 milli-ohms: ±1% reading, ±1 count;
1 ¬ 500 ohms: ±1.5% reading, ±1 count
resistance channels three static resistance reading channels, One dynamic resistance channel
test voltage 60 Vdc max
test currents 1 ampere, 5 amperes, 10 amperes
ac current input clamp-on current sensor, 1 – 20 Amperes
display back-lit LCD Screen (128 x 64 pixels); viewable in bright sunlight and low-light
levels
printer built-in 4.5-inch wide thermal printer
external data storage one USB Flash drive interface port; stores up to 999 test records on a USB
Flash drive (not included)
computer interfaces one RS-232C port, one USB port
internal test record storage stores up to 128 static resistance test records (48 tests per record) and 11
dynamic resistance test records
load tap changer contact Designed to meet IEC 61010 (1995), UL 61010-a, and CAS-C22.2 standards
safety designed to meet UL 61010A-1 and CAN/CSA C22.2 No. 1010.1-92 standards
environment Operating: -10°C to +50°C (+15°F to +122°F); Storage: -30°C to +70°C (-22°F
to +158°F)
humidity 90% RH @ 40°C (104°F) non-condensing
altitude 2,000 m (6,562 ft) to full safety specifi cations
cables one 50-foot current cable set, three 50-foot resistance cable sets, ground
cable, USB cable, RS-232C cable, LTC cable, power cord, cable bag
options shipping case
warranty one year on parts and labor


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