The TRM-403 is a three phase transformer winding resistance meter that allow the user to connect all test cables to the transformer bushings. The unit will then measure the transformer resistance value for each of the phases without the need to disconnect and reconnect cables for each phase.
The TRM-403 can provide a fast and stable reading of very large transformers by utilizing a 60Vdc power supply. It is capable of outputting a selectable test current from 1A to 40A. Since the TRM-403 can accurately measure resistance from 1 micro-ohm to 500 Ohms, it can be used as a micro-ohm meter to measure EHV circuit breaker contact resistance, or for any low resistance measuring application.
| Key Features |
| Perform three phase test on a transformer without the need to switch cables |
| Can provide individual Delta winding resistance values |
| Can provide individual Wye (with no neutral) winding resistance values |
| Demagnetize transformer after test |
| Selectable test current from 1A to 40A |
| Computer control via RS-232C, USB, or Bluetooth interface |
| Built-in 2.5″ wide thermal printer |
| Specifications |
|
TRM-403
40 A Three-Phase Winding Resistance Meter with Demagnetization
|
|
| Features | Parameters |
| Type | Portable transformer winding resistance meter |
| Dimensions | 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
|
| Satety | 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
|
| Options | Shipping Case |
Note:
Specifications are valid at nominal voltage and ambient temperature of +25˚C (+77˚F).
