AC/DC Open loop current transformers
Description
Open loop current transformers
The WDI current sensor is an open-loop current transformer designed for measuring direct and alternating currents. The primary current generates a magnetic flux and this is evaluated by means of a magnetic circuit and Hall sensor in the air gap. The signal from the Hall sensor is processed by an electronic circuit and an exact representation of the primary current is output as a voltage.
Advantages (electrical)
- Measurement of direct and alternating currents
- Voltage output
- Low power consumption
- No additional losses in the measuring circuit
- High-quality UL-listed insulating materials (e.g. UL94-V0
- Safe electrically isolated primary and secondary circuits
- Good price/performance ratio
Advantages (mechanical)
- Low weight
- Robust housing designs (for horizontal/vertical mounting)
- Connections: clamps, plugs, flat-cable plugs or cables
- Wide range of housings with various push-through openings
Typical applications
Industry, Renewable energy sources, Railway engineering, Energy, automation and building technology
| Type | 25 | 150 | 300 | ||
| Primary rated current [A] | ÎPN | Peak | 25 | 150 | 300 |
| Max. Primary rated 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 |
| Standing impulse 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% von 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 | |
| Air section [mm] | dCpi | 3 | 9 | 9 | |
| Type | PIN-Conncetion / 4-pole | 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 |
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