The Vanguard Instruments TRM-403 is a three-phase transformer winding resistance meter that allows the user to measure the resistance of each phase of a transformer without the need to disconnect and reconnect cables.
The TRM-403 can provide a fast and stable reading of very large transformers by utilizing a 60Vdc power supply and is capable of outputting a selectable test current from 1A to 40A. It can accurately measure resistance from 1 micro-ohm to 500 Ohms, and can be used as a micro-ohm meter to measure EHV circuit breaker contact resistance, or for any low resistance measuring application.
Features:
Benefits:
Technical Specifications:
Resources:
Features:
- Three-phase transformer winding resistance meter
- Measures the resistance of each phase of a transformer without the need to disconnect and reconnect cables
- Can provide a fast and stable reading of very large transformers
- Utilizes a 60Vdc power supply
- Capable of outputting a selectable test current from 1A to 40A
- Can accurately measure resistance from 1 micro-ohm to 500 Ohms
- Can be used as a micro-ohm meter to measure EHV circuit breaker contact resistance
- Can be used for any low resistance measuring application
Benefits:
- Can help to identify problems with transformers before they cause outages
- Can help to ensure the safe operation of transformers
- Can help to extend the life of transformers
- Can save time and money by quickly and easily measuring the resistance of transformers
Technical Specifications:
| 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: 35 lbs (15.8Kg) |
| OPERATING VOLTAGE | 100 – 240 Vac, 50/60 Hz |
| RESISTANCE READING RANGE | 1 micro-ohm to 500 Ohms |
| ACCURACY | 1 – 19,999 micro-ohms: ±0.5% reading, ±1 count 20 – 999 milliohms: ±1% reading, ±1 count 1 – 500 Ohms: ±1.5% reading, ±1 count |
| TEST CURRENT | 1-40A in 1A increments |
| TEST VOLTAGE | 60 Vdc charging, 18V DC max during measurement |
| INPUT CHANNELS | 4 input channels for measuring resistance |
| DISPLAY | Back-lit LCD (128 x 64 pixels), 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 | Four 50-foot test cables, one LTC control cable, one ground cable, one power cord, one USB cable |
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