Manufacturer of Resistance Of Aluminum Cube - Crowbar/Chopper Resistor – Wepower
Manufacturer of Resistance Of Aluminum Cube - Crowbar/Chopper Resistor – Wepower Detail:
█ Application
Crowbar resistor is mainly used in low voltage ride through technology of wind power inverter. It is used at the rotor side of wind turbine generator to bypass the rotor side converter. In case of low voltage disturbance in the power grid, the DC bus voltage and rotor current shall be prevented from being too high. It mainly works in fault state to damp stator flux linkage. Crowbar resistors can dissipate huge amounts of energy instantaneously.
It is mainly used in the frequency conversion / converter system of doubly fed variable speed constant frequency generator units to improve the low voltage ride through capability of generator units, which is limited by the power grid
Large current impact caused by voltage drop protects excitation converter and limits rotor winding over voltage.
█ Feature:
The resistance material is imported alloy steel, which can absorb large energy impact in a short time, and can meet different power requirements.
█ structures:
Mica sandwich structure, traditional metal carrier grid structure and block carrier structure:
1. mica sandwich structure, with small volume, low cost and large heat capacity, is suitable for absorbing large energy in a short time and for single impact at long intervals (once a week).
2. with the traditional metal grid structure, the product has relatively moderate volume, relatively moderate cost and good heat dissipation performance. It is suitable for multiple impacts in a short time (once every 30 minutes). It can be used in crowbar resistor, chopper resistor and braking resistor circuits.
3. block carrier structure, the product has strong impact resistance and good heat dissipation performance. High structural strength and moderate price. Suitable for short-time multiple impact. It can be applied to crowbar resistor, chopper resistor, braking resistor and other circuits.
█ Life Time of Crowbar Resistor
200J | 1 times/second | |
220KJ | 1 times/30mins | 35000 times(20 years of life) |
640KJ | 1 times/week | 1000 times(20 years of life) |
1360KJ | 1 times/month | 260 times(20 years of life) |
Take 1.5MW windmill generator as an example, environment temperature ≤ 60℃ |
█ Resistor Material Comparison
Material |
(g/mm3) |
(Ω·mm2/m) |
J/(g·K) |
W/(m·K) |
ppm/℃ |
SUS304 |
7.9 |
0.72 |
0.5 |
13.2 |
≤1400 |
SUS316 |
7.93 |
0.78 |
0.45 |
13.23 |
≤900 |
SUS310S |
7.98 |
0.88 |
0.46 |
13.2 |
≤600 |
Cr20Ni80 |
8.4 |
1.09 |
0.441 |
16 |
≤100 |
█ Selection Table
Energy |
Resistance |
Time |
Dimension(mm) |
||
(L)mm |
(W)mm |
(H)mm |
|||
50KJ |
3R |
30mS |
420 |
160 |
95 |
200KJ |
2R |
3.8S |
285 |
178 |
150 |
500KJ |
3.3R |
3.8S |
670 |
150 |
150 |
1.0MJ |
0.36R |
0.1S |
395 |
190 |
153 |
1.5MJ |
0.45R |
3S |
520 |
292 |
100 |
2.0MJ |
0.4R |
30mS |
868 |
175 |
130 |
2.0MJ |
0.5R |
30mS |
943 |
195 |
135 |
2.2MJ |
0.7R |
1S |
446 |
240 |
153 |
2.5MJ |
0.95R |
3S |
597 |
400 |
200 |
3.0MJ |
0.7R |
1S |
432 |
240 |
153 |
Note: For other technical parameters & requirements, please contact with our company’s business man.
Product detail pictures:
Related Product Guide:
Persisting in "High high quality, Prompt Delivery, Aggressive Price", we've established long-term cooperation with clients from the two overseas and domestically and get new and old clients' superior comments for Manufacturer of Resistance Of Aluminum Cube - Crowbar/Chopper Resistor – Wepower , The product will supply to all over the world, such as: Finland, Lithuania, Montpellier, High output volume, top quality, timely delivery and your satisfaction are guaranteed. We welcome all inquiries and comments. We also offer agency service---that act as the agent in china for our customers. If you are interested in any of our products or have an OEM order to fulfill, please feel free to contact us now. Working with us will save you money and time.
By Cara from Kyrgyzstan - 2018.06.09 12:42
Factory equipment is advanced in the industry and the product is fine workmanship, moreover the price is very cheap, value for money!
By Penny from Australia - 2017.05.02 11:33