APPLICATIONS:
- Surge absorption for high-frequency thyristor inverters
- Load resistors for high-voltage circuits
- Damping resistors for fusion devices
- Other large-capacity load resistors
CHARACTERISTICS:
| Items | Characteristic Value |
| Maximum Operating Temperature | 150℃ |
| Room Temperature | 80℃ |
| Resistance Dimensions | φ75×φ20×t15(mm) |
| Resistance Specific Heat | 500- 750J/(kg･K) |
| Resistor Thermal Conductivity | 1.2W/m･K |
| Resistor Temperature Coefficient | -0.04- -0.08%/℃ |
| Coefficient of Thermal Expansion of Resistor | 4.5- 6.5×10-6 |
| Allowable Energy Injected | 10kJ/枚 |
| Allowable Current Value | 800A(MAX.) |
| Allowable Voltage | 10kV(MAX.) |
| Cooling Water Pressure Loss (3ℓ / min) | 2kPa per cooling zone |
FEATURES:
- No water leakage
- Short time rating power is as large as 500 W per element.
- Large absorbing energy
- Higher withstand voltage. 10 kV per element at 1.2 x 50 waveform
- Mounting legs are insulated from elements.
- Non-inductive resistor
- Large current capacity due to the large cross-sectional area of the element.
WD STANDARD SPECIFICATIONS
| Model | Rated Power (W) |
Number of elements |
Dimensions (mm) | Resistance Value Range (Ω) |
Allowable Energy Injected (kJ) |
||
| A | B | C | |||||
| WD-1 | 350 | 1 | 61 | 110 | 131 | 0.5- 20 | 10 |
| WD-2 | 700 | 2 | 94 | 143 | 164 | 1- 40 | 20 |
| WD-3 | 1050 | 3 | 127 | 176 | 197 | 1.5- 60 | 30 |
| WD-4 | 1400 | 4 | 160 | 209 | 230 | 2- 80 | 40 |
| WD-5 | 1750 | 5 | 193 | 242 | 263 | 2.5- 100 | 50 |
Notes on Using the Indirect Water-Cooled Resistors (WD)
- Keep the flow rate of the cooling water at 3 ℓ/min or higher, and the water pressure at 0.59 MPa or lower.
- When using the standard hose joint, attach a hose with an inner diameter of 3/8 inches.
Use a hose clamp, and tighten it at 1 to 1.5 N•m. - Use pure water with a resistivity of 1 MΩ•cm or higher (an electrical conductivity of 1 µS/cm or lower) as the cooling water.
- Do not use these resistors in an environment with high humidity. If the resistor has absorbed moisture, remove the hose
and other parts and then allow the resistor to dry at 40℃ for at least 48 hours.
*Applying a direct current to a resistor that has absorbed moisture can cause electrolytic corrosion, resulting in abnormal
resistance. Check the resistor before use. - The withstand voltage of the standard assembly products is about 10 kV, regardless of the number of resistors included, due to the withstand voltage limits of the insulating plate (FRP). Upon request, we will increase the withstand voltage by changing the assembly structure.
