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Fast delivery Aluminum Galling Resistance - Crowbar/Chopper Resistor – Wepower

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Fast delivery Aluminum Galling Resistance - 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.

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The key to our success is "Good Products Good quality, Reasonable Value and Efficient Service" for Fast delivery Aluminum Galling Resistance - Crowbar/Chopper Resistor – Wepower , The product will supply to all over the world, such as: South Africa, United States, Vietnam, Upon today, we have customers from all over the world, including USA, Russia, Spain, Italy, Singapore, Malaysia, Thailand, Poland, Iran and Iraq. The mission of our company is to provide the highest quality products with best price. We are looking forward to doing business with you.
This supplier offers high quality but low price products, it is really a nice manufacturer and business partner.
5 Stars By Nainesh Mehta from Egypt - 2018.02.04 14:13
Hope that the company could stick to the enterprise spirit of "Quality, Efficiency, Innovation and Integrity", it will be better and better in the future.
5 Stars By Louise from Malaysia - 2017.05.21 12:31

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