UPA-20 is a mobile device, which could be easily transported to a required testing location.
UPA-20 operates on the principle of varying the power in the primary circuit of the matching power transformer and, respectively, varying the output current, flowing through the automatic circuit breaker under the test. Power regulation could be done either through an external regulator (RNO or VR) or through a built-in thyristor controller.
- Technical Specifications
- Operating Conditions
The device is designed for an indoors operation under the following conditions:
| Condition |
Value |
| Air temperature, °С |
from -35 to +35
|
Relative humidity, %, up to
|
80 at +20° С |
Atmospheric pressure, kPa (mm hg)
|
84,0 – 106,7 (630 – 800) |
| Characteristic |
Value |
AC power supply voltage, V
|
220±22 or 380±38 |
Power supply frequency, Hz
|
50±1 |
| Maximum output current when powered from 220 V circuit, kA |
14 |
Maximum output current when powered from 380 V circuit, kA
|
20 |
| Test current measurement range, kA |
3...20 |
Range of measurements of the test current supply time, s
|
1...7200 |
| Range of measurements of the test current supply time, ms |
50...990 |
Reduced error of the test current measurement, %
|
±3 |
Reduced error of the measurement of the current flow duration and switching off time, %, max
|
±3 |
Continuous running time under the maximum current, s, min
|
10 |
| Maximum consumed power, kVA |
55 |
| Net weight of IT-20 (current supply), kg, max |
80 |
| Net weight of the control unit (without flexible busbars), kg, max |
20 |
Dimensions, mm, max
|
960х680х400 |
| Lifespan, years, avg |
10 |
|