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Your contact: +49 - 212 8804-0 • info@reo.de

Series WKO

Closed loop current transformers

Series WKO

Unique Selling Point


  • Measurement of direct, alternating and mixed currents
  • Very high precision and short response time
  • Broad frequency spectrum and low temperature drift
  • Very good linearity and
    overcurrent resistance
  • No additional losses in the measuring circuit (DC to 150 kHz)
  • Current output for lengthy transmission lines
  • High-quality UL listed insulating materials (e.g. UL94-V0)
  • Safe electrically isolated primary and secondary circuits
  • Robust housing designs (for horizontal/vertical mounting)
  • Variable connections, e.g. clamps, plugs, flat-cable plugs or cables
  • Wide range of housings with various push-through openings

Description


WKO current sensors work in accordance with the proven compensation principle and are suitable for measuring direct, alternating and mixed currents.

The primary current generates a magnetic flux, which is compensated by an internal secondary coil. The current is evaluated by an electronic circuit and a Hall sensor. The secondary compensating current is a precise representation of the primary current to be measured. 

According to: 

  • EN50178
  • EN50121, EN55011
  • IEC61869-1, IEC61869-8, IEC61010-1 
  • UL94-V0 – UL Norm: all parts are UL-listed

Applications

  • Power Electronics : AC DC motor control , inverter technology , drive control
  • Railway Technology: drive control
  • Renewable energy : wind turbines control, monitoring

 

General technical data:

  • Accuracy: better than 1%
  • Ambient temperature:  -25°C … +70°C
  • Storage temperature: -25°C … +85°C

Technical Data


  • Primary rated current : 25 - 2000 A
  • Frequency range : 100000 - 200000 Hz

Mode of Operation

Your contact: +49 - 212 8804-0 • info@reo.de

Series WKO

Closed loop current transformers

Technical data

Electrical data

Type

Primary RMS
Nominal current 
IPN [A]

Measurement
range
IP [A]

Supply
UC [V]

Accuracy 

XG@Ipn

[-20…70°C]

von IPN [%]

Ratio
KN

Secondary RMS
Nominal current ISN [mA]

Secondary winding
current
Widerstand
Rs@70°C  [Ω]

No load
Current
[mA]

WKO 25

25

0 … ±35

±12…15

<  ±0,9

1000

25

16

36+IS

WKO 50

50

0 … ±70

±12…15

< ±1

1000

50

43

11+IS

WKO 100

100

0 … ±150

±12…15

< ±1

1000

100

24

36+IS

WKO 300

300

0 … ±500

±12…15

< ±1

2000

150

30

36+IS

WKO 500

500

0 … ±1000

±15…24

< ±1

5000

100

72

36+IS

WKO 1000

1000

0 … ±1500

±15…24

< ±1

5000

200

48

24+IS

WKO 2000

2000

0 … ±3000

±15…24

< ±1

5000

400

27

78+IS

 

Accuracy and dynamic data 

Type

Linearity error
e [%]

Offset
error@25°C

IO [mA]

Offset Drift
-25°C …+70°C
IOT [mA]

Reaction time
tra[µs]

Response time
10%-90%
ta[µs]

dI/dt
[A/µs]

Bandwith
-1dB  [kHz]

WKO 25

< ±0,1

< 0,3

< 0,5

< 0,5

< 1

> 50

DC…150

WKO 50

< ±0,1

< 0,3

< 0,5

< 0,5

< 1

> 50

DC … 200

WKO 100

< ±0,1

< 0,4

< 1

< 0,5

< 1

> 100

DC .. 100

WKO 300

< ±0,1

< 0,2

< 0,5

< 0,5

< 1

> 100

DC .. 100

WKO 500

< ±0,1

< 0,2

< 0,5

< 0,5

< 1

> 100

DC .. 100

WKO 1000

< ±0,1

< 0,3

< 0,5

< 0,5

< 1

> 100

DC .. 100

WKO 2000

< ±0,1

< 0,5

< 0,5

< 0,5

< 1

> 100

DC .. 100

 

Isolation data

Type

Creepage path
dCp  [mm]

Air path
dCi  [mm]

Creepage
Strength[CTI]

AC –Isolation test
50/60Hz 1min
Ud [kV]

Pulse voltage test
1,2/50µs
Ui[kV]

Measures
[kg]

WKO 25

4

3

600

3,8

6

0,08

WKO 50

8

7

600

3,8

6

0,022

WKO 100

10

9

600

3,8

6

0,125

WKO 300

10

9

600

3,8

6

0,125

WKO 500

10

9

600

6

12,5

0,240

WKO 1000

15

12

600

6

14,5

0,450

WKO 2000

25

21

600

6

14,5

1,620

Your contact: +49 - 212 8804-0 • info@reo.de

Series WKO

Closed loop current transformers

Maximum measuring resistance 

Your contact: +49 - 212 8804-0 • info@reo.de

Series WKO

Closed loop current transformers

Dimension drawings

Design 25 A - FS 6,3 x 0,8


Design 50 A - Lötpin


Design from 100 A - Molex 6410


   

 

 

Dimensions

Type

PIN-Connection
3polig

h
[mm]

b
[mm]

b1 / b2
[mm]

t
[mm]

DL
[mm]

p / s
[mm]

a / a1
[mm]

a
[mm]

c1 / c2
[mm]

f
[mm]

e
[mm]

l
[mm]

WKO 25

-U A +U

39

39

-

26

10

-

2x10 / 6,5

-

25 / 6,5

M3

6,0 x 4,0

9

WKO 50

please find in drawing

WKO 100

-U A +U

55

-

55 / 68

26

20,2

45 / 45

-

60

13,0 / --

4,3

6,0 x 4,0

12

WKO 300

-U A +U

55

-

55 / 68

26

20,2

45 / 45

-

60

13,0 / --

4,3

6,0 x 4,0

12

WKO 500

+U A -U

70

-

70 / 89

33

31,0

57 / 57

-

77

15,2 / --

43

6,0 x 4,3

12

WKO 1000

+U A -U

95

-

94 / 110

44

40,0

78 / 78

-

100

18,0 / --

5,3

8,0 x 5,3

12

WKO 2000

-U A +U

141

-

138 / 170

55

64,0

120 / 120

-

150

18 / 25

6,5

6,2 x 10

12