Double core technology closed-loop current transformers
DESCRIPTION
REO has developed a new generation of closed-loop (C/L) current transducers which guarantees increased current measurement accuracy better than 0.3% in the whole frequency range: DC to 150 kHz. The new current transducer type WKO-2C is a completely new development utilizing REO’s double-core technology magnetic design. The unit uses the latest Hall effect elements with an extended frequency response of up to 150 kHz and an accurate phase response.
Completely redesigned electronics ensure that the new C/L current transducer has better drift compensation and an extended temperature range from -40°C to 85°C.
Modular mounting plates providing universal mounting options
All REO current transformers in the WKO-2C series work according to the proven compensation principle and are suitable for measuring direct and alternating currents.
According to
- EN 50178:1997, UL 94-V0
- EN50121, EN55011
- IEC61869-1, IEC61869-8, IEC61010-1
- According to: EN 50178:1997, UL 94-V0
ADVANTAGES
- High current measurement accuracy of 0.3%
- Modular mounting plates providing universal mounting options
- Lower sensitivity to external magnetic fields
- Bidirectional and isolated current measurement up to ±750A current output
- Modular mounting plates
- REO double core technology
- All materials manufactured using UL-listed materials
Typical applications
- Power electronics: AC-DC motor control, inverter technology, drive control
- Railway technology: drive control
- Renewable energy: control and monitoring of wind turbines
- Accuracy: better than 0.3%
- Ambient temperature: -40 ° C… + 85 ° C
- Storage temperature: -40 ° C… + 90 ° C
- Primary rated current: 300 – 2000 A
- Measurement range: 0… 4000 A
- Frequency range: 150000 Hz
| Type | Primary RMS Nominalcurrent IPN [A] |
Measurement range IP[A] |
Feed-in UC [V] |
Measurement accuracy XG@Ipn [-20…70°C] von IPN [%] |
Ratio KN |
Secondary RMS nominal current ISN [mA] |
Secondary winding Resistor Rs@85°C [Ω] |
No-load current [mA] |
| WKO-2C-300 | 300 | 0…±2000 | ±11,4…25,2 | >±0,3 | 2000 | 150 | 13 | 26+IS |
| WKO-2C-500 | 500 | 0…±1000 | ±11,4…25,2 | >±0,3 | 5000 | 100 | 76 | 26+IS |
| WKO-2C-1000 | 1000 | 0…±2700 | ±14,25…25,2 | >±0,3 | 5000 | 200 | 42 | 26+IS |
| WKO-2C-2000 | 2000 | 0…±4000 | ±14,25…25,2 | >±0,3 | 5000 | 400 | 26 | 26+IS |
| Type | Linearity error e [%] |
Offset error@25°CIO [mA] | Offset Drift-25°C…+70°CIOT [mA] | Response time tRA [μs] |
Response time10%-90%ta [μs] | dl/dt ta [A/μs] |
Bandwidth -1 dB [kHz] |
| WKO-2C-300 | < ±0,1 | ±0,5 | <25 | 0,2 | 0,4 | 400 | 150 |
| WKO-2C-500 | < ±0,1 | ±0,5 | <25 | 0,2 | 0,4 | 400 | 150 |
| WKO-2C-1000 | < ±0,1 | ±0,5 | <25 | 0,2 | 0,4 | 400 | 150 |
| WKO-2C-2000 | < ±0,1 | ±0,5 | <25 | 0,2 | 0,4 | 1000 | 150 |
| Type | Creepage distance dCp [mm] |
Air sectiondCi [mm] | Creep distance [CTI] |
AC insulation test 50/60Hz 1min Ud [kV] |
Pulse voltage test 1,2/50μs Ui [kV] |
Mass [kg] [kg] |
| WKO-2C-300 | 14 | 13 | 600 | 6 | 12,5 | 0,340 |
| WKO-2C-500 | 14 | 13 | 600 | 6 | 12,5 | 0,260 |
| WKO-2C-1000 | 20 | 18 | 600 | 6 | 12,5 | 0,700 |
| WKO-2C-2000 | 35 | 30 | 600 | 6 | 12,5 | 1,600 |
| Type | b1 [mm] |
b2 [mm] |
t [mm] |
s [mm] |
h [mm] |
D Ø [mm] |
D1/D2 [mm] |
Ø f [mm] |
Ø e [mm] |
| WKO-2C-300 | 57 | 70 | 38 | 57 | 70 | 30,2 | 10,4/30,4 | 4,3 | 4,3 |
| WKO-2C-500 | 57 | 70 | 38 | 57 | 70 | 30,2 | 10,4/30,4 | 4,3 | 4,3 |
| WKO-2C-1000 | 78 | 94 | 42 | 78 | 94 | 38,5 | 13,5/40,5 | 5,3 | 5,3 |
| WKO-2C-2000 | 102 | 135 | 52 | 102 | 135 | 57,5 | 20,5/60,5 | 6,5 | 6,5 |
