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UK Design and manufacture of wideband current measurement transformers and wideband voltage measurement transformers

BROADBAND UNTERMINATED CURRENT TRANSFORMER DATA

These transformers can provide an economical alternative to the broadband terminated transformers where frequency response significantly above 2MHz is not required
Unterminated-current-transf

Model

ID minimum mm

OD typical mm

W typical mm

H typical mm

Screened secondary

14

50

25

60

Unscreened secondary

17

47

23

55
Broadband-Current-Transform

All models are available with solder terminals or flying lead output, with or without mounting feet.

A screened secondary winding may also be specified.

TYPICAL VALUES

Model number

notes

Screen, leads, feet

Secondary resistor value

Output

RECTANGULAR PULSE

SINEWAVE

DC Saturation current

Max rms current

Peak current

Price

Droop

Rise time

I-t

3dB bandwidth

Ipeak/f

 

 

Ohms

V/A

%/ms

ns

mA s

lf Hz

hf MHz

A/Hz

Isat A

Irms A

Ipeak A

GBP

Notes

 

1

2

 

 

3

 

4

 

 

 

 

5

K2108

Y,N,Y

5

0.025

0.8

200

400

1.5

2

2.7

3

50

5000

92.00

20

0.1

2.2

200

140

5

2

0.8

50

0.25

5

200

60

10

2

0.4

K2125

N,Y,N

5

0.01

0.06

800

1600

0.1

0.5

10

0.35

200

10000

73.00

50

0.1

0.25

800

350

0.5

0.5

2.3

K2136

N,Y,N

5

0.01

2

800

1200

3

0.5

8

18

200

10000

74.00

50

0.1

10

800

250

15

0.5

1.5

Notes:

 

1. Resistors should be non-inductive and selected to carry secondary rms and pulse currents.

 

2. The sensitivity is determined from the relationship Output = Secondary resistor / ratio. The ratio may be deduced from the resistor values and sensitivities in the data table. Current ratio accuracy +/-0.5% at log mid frequency point. +/-2% within one decade of 3dB cut-off points.

 

3. I-t capability may be improved up to 80% by applying a dc offset current equal to Isat. See “Characteristics” section.

 

4. High frequency properties achieved when secondary resistor is connected to a 50R cable via a resistor designed to make the source resistor equal to 50R. A 50R terminating resistor is employed at the receiver.

 

5. Small quantity price

Updated    December 2018

Other Models:

 

The table describes a small selection from the possible designs of unterminated broadband current transformers.

 

The range can be extended to cover:

    ID 5mm to 100mm

    Sensitivity to 5V/A

    Droop to <0.01%/ms

    I-t to >20,000mA s

    Lf cut-off to <0.01Hz

    Hf cut-off to 5MHz

Contact Lilco Ltd or complete the enquiry form for further information on this range.