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Factory making Motor Protection Resistor - Crowbar/Chopper Resistor – Wepower

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  • Factory making Motor Protection Resistor - Crowbar/Chopper Resistor – Wepower
  • Factory making Motor Protection Resistor - Crowbar/Chopper Resistor – Wepower
  • Factory making Motor Protection Resistor - Crowbar/Chopper Resistor – Wepower

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"Sincerity, Innovation, Rigorousness, and Efficiency" is definitely the persistent conception of our corporation to the long-term to establish alongside one another with customers for mutual reciprocity and mutual profit for Air Cooled Braking Resistor, Thermal Resistance Of Aluminum Block, Dc Load Bank, In addition, we would properly tutorial the purchasers about the application techniques to adopt our items plus the way to select appropriate materials.
Factory making Motor Protection Resistor - 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:

Factory making Motor Protection Resistor - Crowbar/Chopper Resistor – Wepower detail pictures

Factory making Motor Protection Resistor - Crowbar/Chopper Resistor – Wepower detail pictures

Factory making Motor Protection Resistor - Crowbar/Chopper Resistor – Wepower detail pictures

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Our eternal pursuits are the attitude of "regard the market, regard the custom, regard the science" as well as theory of "quality the basic, have faith in the initial and administration the advanced" for Factory making Motor Protection Resistor - Crowbar/Chopper Resistor – Wepower , The product will supply to all over the world, such as: Germany, Riyadh, Jakarta, Our staffs are rich in experience and trained strictly, with professional knowledge, with energy and always respect their customers as the No. 1, and promise to do their best to provide the effective and individual service for customers. The Company pays attention to maintaining and developing the long-term cooperation relationship with the customers. We promise, as your ideal partner, we will develop a bright future and enjoy the satisfying fruit together with you, with persisting zeal, endless energy and forward spirit.
    • The factory workers have rich industry knowledge and operational experience, we learned a lot in working with them,we are extremely grateful that we can encount a good company has excellent wokers.
    5 Stars By mary rash from Mexico - 2018.06.18 19:26
    The company has a good reputation in this industry, and finally it tured out that choose them is a good choice.
    5 Stars By Daniel Coppin from Estonia - 2017.11.29 11:09

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