1. Application
FUOOTECH produced and exported the FTDC-20A Transformer DC resistance rapid tester since 2005. After continuous improvement and upgrading based on the good suggestions from clients and absorbing the newest technology at home and abroad, FTDC-20A already becomes the newest product for transformer DC resistance test.
This 20A DC Resistance tester adopts new power supply technology, which has the characteristics of small size, light weight, large output current, good repeatability, strong anti-interference ability, perfect protection function and so on.
The whole test equipment is controlled by a high-speed single-chip microcomputer, with a high degree of automation, with automatic discharge and discharge alarm functions. The instrument has high test accuracy and easy operation, and can realize the rapid measurement of transformer direct resistance.
2. When To Measure Winding Resistance?
1). Risk of damage is significant whenever a transformer is moved. This is inherent to the typical transformer design and modes of transportation employed. Damage can also occur during unloading and assembly. The damage will often involve a current carrying component such as the LTC, RA switch or a connector.
Damage to such components may result in a change to the DC resistance measured through them. Hence, it is recommended that the DC resistance be measured on all on-load and off-load taps prior to energizing.
2). If the transformer is new, the resistance test also serves as a verification of the manufacturers work. Installation measurements should be filed for future reference.
3). At routine (scheduled) Transformer Maintenance: routine maintenance is performed to verify operating integrity and to assure reliability. Tests are performed to detect incipient problems.
3. Technical Parameters
|
Items |
Technical parameters |
Notes |
|
Measuring current |
<20mA,1A,2.5A,5A,10A,20A |
|
|
Measuring range |
100μΩ～1Ω (20A) |
Accuracy: ±(0.2%+2) |
|
|
10Ω-20KΩ (<20mA) |
Accuracy: ±(0.5%+2) |
|
Minimum resolution |
0.1μΩ |
|
|
Display |
LED Display |
The resistance shows 4 significant digits |
|
data storage |
1000 list |
|
|
Working environment |
Environment temperature: 0℃～40℃ |
|
|
Power supply |
AC 220V±10V, 50Hz±1 Hz |
Safety tube 10A |
|
Maximum power |
1000W |
|
|
Dimension |
400×225×350(mm) |
|
|
Weight |
Tester box: 15.1KG, Line box: 5.75KG |
|
4. Features
1). The whole machine is controlled by high-speed single chip microcomputer, with high degree of automation and easy operation.
2). The instrument adopts new power supply technology, with many current ranges and wide measurement range, which is suitable for DC resistance measurement of large and medium transformers.
3). The protection function is perfect, which is reliable to protect the impact of back EMF on the instrument, and the performance is more reliable.
4). Intelligent power management technology, the instrument always works in the minimum power state, which can effectively save energy and reduce heating.
5). Sound discharge alarm, clear discharge indication, reduce operation mistakes.
6). Fast response.
7). 320x240 ultra small pixel 65K true color liquid crystal,
8). The instrument is equipped with RS232 and USB interface, which can communicate with computer and store in U disk.
9). The instrument has its own calendar clock and power down memory, which can store 1000 groups of test data and can be consulted at any time
5. Stocks at office
6. Packing, Delivery, Shipping and Payment
7. Certificates
8. Fault inspection and Trouble-shooting
|
Phenomenon |
Reason |
Solution |
|
|
1 |
Green light don't turn on when power switch connected |
Current lines open a circuitPower fuse fusing |
Change power lines |
|
2 |
Red light don't turn on when push the red button |
Pressure regulating potentiometer didn't return to 0 |
Potentiometer return to 0 |
|
3 |
Red light turns on when push the red button, while raise voltage, red light turns off, red light turns on |
High voltage output terminal tester has short circuit |
Check the output electriccable. Check the tested products |
|
4 |
During raise voltage, red light turns off, green light turns on. |
Tester discharge or break-down over voltage or over current protection movement |
Check the tested products reset setting valu |
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