Single phase DC test choke
Description
Switches must pass many different tests during the approval phase. Some of these tests involve the switching behaviour under different load conditions, the switch is tested on nominal load, overload and at many cos. Additionally, the switch will be checked on switch on and switch off procedures. The parameters must be every time the same during these tests.
In the past, air chokes were used as inductive loads because they are virtually non-saturating. However, air chokes are larger and have a stronger stray field than comparable iron-core chokes with corresponding magnetic energy. In order to set the respective cos? – value, suitably adapted resistors then had to be connected. In order to fulfill all the required test points, many different inductive and resistive loads had to be present.
In the past, air chokes were used as inductive loads because they are virtually non-saturating. However, air chokes are larger and have a stronger stray field than comparable iron-core chokes with corresponding magnetic energy. In order to set the respective cos? – value, suitably adapted resistors then had to be connected. In order to fulfill all the required test points, many different inductive and resistive loads had to be present.
Advantages
- Adapted linearity, no saturation in the workspace
- Several taps, just a few chokes instead of many are needed
- Adjusted winding resistance, thereby reducing resistive loads
- Designed for continuous load and short-term exposure
- Optimizing weight and dimensions, lower costs
- High voltage, standard up to 1000V
- Insulation class: F at 40° C
- Climatic category: 25/085/21 DIN IEC 68 Part 1
- Max.
winding temperature: 140° C - Protection rating: IP 00
- Nominal Voltage: 24 V
- Rated current: 0,2 – 4 A
- Inductance: 160 – 125000 mH
| Type | Rated voltage [V] | Rated current [A] | Inductance [mH] | DC-Resistance [mΩ] | Power loss [W] |
| NPT 892/0,2 | 24 50/60 Hz | 0,2 | 125.000 | 197,3 | 20 |
| NPT 892/2 | 24 50/60 Hz | 2 | 1.200 | 2,855 | – |
| NPT 892/4 | 24 50/60 Hz | 4 | 160 | 2,8 | 64 |
| Type | L [mm] | B [mm] | H [mm] | N1 [mm] | N2 [mm] | øD1 [mm] | øD1 [mm] | A1 [mm] | Cooper [kg] | Weight [kg] |
| NPT 892/0,2 | 200 | 148 | 261 | 124 | 120 | 10×18 | 6,2 | 24 | 1 | 2 |
| NPT 892/2 | 240 | 168 | 375 | 144 | 140 | 10×18 | 18 | 44 | 3 | 10 |
| NPT 892/4 | 280 | 173 | 417 | 176 | 143 | 13×20 | 4,4 | 38 | 11 | 38 |
