Atec WRM-10 User Manual

WRM-10
lightweight winding resistance meter
ightweight winding resistance mete
Vanguard Instruments Company, Inc.
www.vanguard-instruments.com
WRM-10
Tin
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lightweight winding resistance meter
The WRM-10 is 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-10 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.
outstanding features
• 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
• Lightweight (27 lbs / 12.2 kg)
WRM-10 connections
Since the WRM-10 can accurately mea­sure resistances ranging from 1 micro­ohm to 2,000 ohms, it can also be used to measure EHV circuit-breaker contact resistance, motor winding resistance, or any low resistance. In addition to mea­suring the resistance value, the WRM-10 also checks the “make-before-break” tapswitching sequences of voltage regu­lators and load tap changers.
The WRM-10 is furnished with three 50­foot test cables. Each test cable lead is terminated with a quick-disconnect test clip.
Built-in Safety Features
At the end of each test, the WRM-10 automati­cally dissipates the stored energy in the trans­former. This discharge circuit will continue to work even if the supply voltage is lost. For added safety, the unit’s power supply is thermally pro­tected from over-load damage.
User Interface
The WRM-10 features a back-lit LCD screen (16 characters by 2 lines) that is viewable in both bright sunlight and low-light levels. A “turn-and­push” knob is used to control the unit. A built-in RS-232C interface port is provided for diagnos­tic testing and fi rmware upgrades.
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WRM-10 Controls & Indicators
Resistance Input
Channel #1
Warning Indicators
Current Output
Connectors
Resistance Input
Channel #2
WRM-10 specifi cations
type portable transformer winding resistance meter
physical specifi cations 17”W x 12K”H x 10K”D, (42.6 cm x 32.0 cm x 27.0 cm); Weight: 27 lbs (12.2 kg)
input power 100 ¬ 120 Vac or 200 ¬ 240 Vac (factory pre-set), 50/60 Hz
resistance reading range 1 micro-ohm ¬ 2,000 ohms
accuracy 1 ¬ 19,999 micro-ohms: ±0.5% reading, ±1 count;
20 ¬ 999 milli-ohms: ±1% reading, ±1 count; 1 ¬ 2,000 ohms: ±1.5% reading, ±1 count
test voltage 36 Vdc max
test current range auto range, 10 Amperes max
display back-lit LCD Screen (16 characters by 2 lines); viewable in bright sunlight and low-light levels
control Single “turn-and-push” knob
computer interface RS-232C port used for factory calibration and diagnostics
safety designed to meet IEC61010 (1995), UL61010A-1, CSA-C22.2 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 three 50-foot test cables, ground cable, power cord and cable bag
options transportation case
warranty one year on parts and labor
NOTE : the above specifi cations are valid at nominal voltage and ambient temperature of +25°C (+77°F). Specifi cations are subject to change without notice.
Power Switch
Back-lit LCD Screen (16 characters by 2 lines)
RS-232C Interface
(for factory diagnostics and calibration)
Function Control Knob
ordering information
Part number WRM-10 WRM-10 and cables
Part number WRM-10 CASE WRM-10 shipping case
Part number WRM-10 50-FT CABLES 50-foot test cables
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Instruments designed and developed by the hearts and minds of utility electricians around the world
Vanguard Instruments Company, (VIC), was founded in 1991. Currently, our 28,000 square-foot facility houses Administration, Design & Engineering, and Manufacturing operations. From its inception, VIC’s vision was, and is to develop and manufacture innovative test equipment for use in testing substation EHV circuit breakers and other electrical apparatus.
The fi rst VIC product was a computerized circuitbreaker analyzer, which was a resounding success. It became the forerunner of an entire series of circuitbreaker test equipment. Since its beginning, VIC’s product line has expanded to include microcomputer-based, precision micro-ohmmeters, single and three phase transformer winding turns­ratio testers, transformer winding-resistance meters, mega-ohm resistance meters, and a variety of other electrical utility maintenance support products.
VIC’s performance-oriented products are well suited for the utility industry. They are rugged, reliable, accurate, user friendly, and most are computer controlled. Computer control, with innovative programming, provides many automated testing functions. VIC’s instruments eliminate tedious and time-consuming operations, while providing fast, complex, test-result calculations. Errors are reduced and the need to memorize long sequences of procedural steps is eliminated. Every VIC instrument is competitively priced and is covered by a liberal warranty.
Vanguard Instruments Company, Inc.
1520 S. Hellman Avenue • Ontario, California 91761, USA
Phone 909-923-9390 • Fax 909-923-9391 www.vanguard-instruments.com
August, 2012
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