AC/DC Direct-Imaging Current Transformers (Open-Loop Converters)
Description
Direct-imaging current transformer (Open-Loop Converter)
The WDI current sensor is a direct-imaging current transformer designed for measuring DC and AC currents. The primary current flow generates a magnetic flux, which is evaluated in the air gap by means of a magnetic circuit and Hall sensor. An electronic circuit processes the signal from the Hall sensor and outputs an exact image of the primary current with a voltage at the output.
Advantages (Electrical)
- Measurement of DC and AC currents
- Voltage output
- low power consumption
- no additional losses in the measuring circuit
- high-quality insulation materials listed according to UL
- safe, electrically isolated primary and secondary circuits
- good value for money
Advantages (Mechanical)
- low weight
- robust housing designs (horizontal/vertical mounting)
- Connections: terminals, plugs, flat connectors or cables
- versatile range of housings with different push-through openings
Typical applications
Industry, renewable energies, railway technology, energy, automation and building technology
| Type | 25 | 150 | 300 | ||
| Primary current [A] | ÎPN | Peak | 25 | 150 | 300 |
| Max. Primary current [A] | ÎmaxPN | Peak | 0- ± 30 | 0- ± 180 | 0- ± 360 |
| Secondary current [mA] | ÎoutPN | ± 5 | ± 5 | ± 5 | |
| Min. load resistance | RBmin | ± 15 Vdc | ± 30A peak=2 | ± 150 peak=2 | ± 300 peak=2 |
|---|---|---|---|---|---|
| ± 180A peak=2 | ± 360A peak=2 | ||||
| Max. load resistance | RBmax | ± 15 Vdc | ± 30A peak=10 | ± 150 peak=2 | ± 300 peak=2 |
| ± 180A peak=2 | ± 360A peak=2 | ||||
| Max. peak output voltage [V] | ÜaN | Peak | ± 10 | ± 10 | ± 10 |
| Operating voltage [Vdc] | US | ± 5% | ± 15 | ± 15 | ± 15 |
| No-load current [mA] | IBO | (@ ± 15 V) + loutpN | 9 | 9 | 9 |
| Insulation test voltage [kV] | VP | r.m.s. 50 Hz | 3 | 3 | 3 |
| Impulse withstand voltage[kV] | VW | 1,2/50μs | 3 | 5 | 5 |
| Measuring accuracy 50 Hz [%] | FU | @IPN, TA=25°C | ± 0.6 | ± 0.6 | ± 0.6 |
| Linearity error [%] | FLU | @TA=25°C | ≤ 1.0 | ≤ 1.0 | ≤ 1.0 |
| Offset voltage [mV] | Uo | @IPN = 0, TA = 25°C | 20 | 20 | 20 |
| Drift offset voltage [mV] | △Uo | Io -25°C…+70°C | 60 | 60 | 60 |
| Temperature drift [%K] | %/△T | ≤ 0.05 | ≤ 0.05 | ≤ 0.05 | |
| Response time [μs] | tr | @ 90% of IPN | 25 | 25 | 25 |
| Frequency range [kHz] | f | (-3 dB) DC … 10 | (-3 dB) DC … 10 | (-3 dB) DC … 10 | |
| Ambient temperature [°C] | TA | -25 to + 75 | -25 to + 75 | -25 to + 75 | |
| Storage temperature[°C] | Ts | -10 to + 85 | -10 to + 85 | -10 to + 85 | |
| Weight [kg] | m | 0,075 | 0,075 | 0,075 | |
| Creepage distance [mm] | dCp | 4 | 10 | 10 | |
| Clearance [mm] | dCpi | 3 | 9 | 9 | |
| Type | PIN connection / 4-pin | h [mm] |
b [mm] |
b1/b2 [mm] |
t [mm] |
DL [mm] |
p/s [mm] |
a/a1 [mm] |
c1/c2 [mm] |
f [mm] |
e [mm] |
l [mm] |
| WDI 25 | A; O,-U; +U | 39 | 39 | – | 26,5 | 10 | – | 3 x 10/6,5 | 25/6,5 | M4 | – | 9 |
| WDI 150 | A; O,-U; +U | 55 | – | 55/68 | 26 | 20,2 | 45/45 | 60/– | 13/– | 4,3 | 6,0 x 4,0 | 23 |
| WDI 300 | A; O,-U; +U | 55 | – | 55/68 | 26 | 20,2 | 45/45 | 60/– | 13/– | 4,3 | 6,0 x 4,0 | 23 |
All data and configurations can be found in our product data sheet.
