TRM-20
Automatic 25 Adc Winding Resistance Test Set with LTC Test, Auto Discharge and Demagnetization
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.
The TRM-20 features dual resistance-reading input channels that can measure two winding resistances simultaneously (primary and secondary windings of a transformer). It can provide a fast and stable reading of very large transformers by utilizing a 60Vdc power supply. The TRM-20 is capable of outputting a selectable test current from 1A to 25A.
Since the TRM-20 can accurately measure resistance values from 1 micro-ohm to 2,000 Ohms, it can be used as micro-ohm meters to measure EHV circuit breaker contact resistance, or for any low resistance measuring application. The TRM-20 can automatically demagnetize the inductive device under test, eliminating the manual task of demagnetizing the transformer core after a resistance test.
ALL VANGUARD TRANSFORMER TESTERS
FEATURES
- Auto-discharge circuit for operator safety
- Demagnetizes transformer after test
- Selectable test current from 1A to 25A
- RS-232C, USB, and Bluetooth computer interfaces
- Built-in thermal printer
CABLES
| Cable | Part Number |
|---|---|
| [8000-0005] USB Cable [ 6′ (1.83m) ] | 8000-0005 |
| [8000-0006] RS-232C Cable [ 6′ (1.83m) ] | 8000-0006 |
| [8000-0015] LTC Control Cable [ 15′ (4.57m) ] | 8000-0015 |
| [8000-0016] Power + Ground Combination Cable | 8000-0016 |
| [8000-0071] Current and Sense Cable (Positive) [ 50′ (15.24m) ] | 8000-0071 |
| [8000-0083] V2 Sense Cable [ 50′ (15.24m) ] | 8000-0083 |
| [8000-0087] V1 Sense Cable [ 50′ (15.24m) ] | 8000-0087 |
| [8000-0148] Current and Sense Cable (Negative) [ 50′ (15.24m) ] | 8000-0148 |
TECH SPECS
| TYPE | Portable transformer winding resistance meter |
| PHYSICAL SPECIFICATIONS | 21” W x 17” H x 9” D (53 cm x 43 cm x 24 cm); Weight: 33 lbs (15.4Kg) |
| OPERATING VOLTAGE | 100 – 240 Vac, 50/60 Hz |
| RESISTANCE READING RANGE | 1 micro-ohm to 2,000 Ohms |
| ACCURACY | 1 – 19,999 micro-ohms: ±0.5% reading, ±1 count 20 – 999 milliohms: ±1% reading, ±1 count 1 -2000 Ohms: ±1.5% reading, ±1 count |
| TEST CURRENT | 1-25A in 1A increments |
| TEST VOLTAGE | 60 Vdc charging, 18V DC max during measurement |
| RESISTANCE CHANNELS | Two static resistance reading channels |
| DISPLAY | Back-lit LCD (64 x 128 dot graphic), viewable in direct sunlight and low light levels |
| PRINTER | Built-in 2.5″ wide thermal printer |
| INTERNAL DATA STORAGE | 256 static test records (each can contain up to 111 readings) and 120 dynamic test records |
| EXTERNAL DATA STORAGE | Up to 999 test records on external USB Flash drive. |
| COMPUTER INTERFACES | RS-232C, USB, Bluetooth |
| SAFETY | Designed to meet UL 61010A-1 and Can/CSA C22.2 No 1010.1092 standards |
| ENVIRONMENT | Operating: -10ºC to 50ºC (15ºF to +122ºF) Storage: (-30ºC to 70ºC (-22ºF to +158ºF) |
| HUMIDITY (MAX) | 90% RH @ 40˚ C (104˚ F) non-condensing |
| ALTITUDE (MAX) | 2000m (6562 ft) to full safety specifications |
| CABLES | One 50-foot current cable set, two 50-foot resistance sense cable set, One LTC control cable, One ground cable, one power cord, One RS-232C cable, one USB cable |
| OPTIONS | Transportation Case |
| WARRANTY | One year on parts and labor |
| Specifications are valid at nominal voltage and ambient temperature of +25˚C (+77˚F). | |
PART #s
- 9007-UC
RESOURCES
- TRM-20/40 Datasheet (English)
- TRM-20/40 Datasheet (Chinese)
- TRM-20/40 User’s Manual (English)
- TRM-20/40 Manual de Operacion (Español)
- Transformer Diagnostic Testing Application Notes
- LTCA Software Manual (English)
- Bluetooth Connection Instructions
- 2018 Vanguard-Doble Condensed Catalog (English)
- 2018 Vanguard-Doble Condensed Catalog (Chinese)
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