Current Transformer
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Rogowski coil OFT Series
OFT is a current transformer fixed by cable ties based on Rogowski principle, particularly suitable for measurement in combination with portable devices.
OFT coils are available in different sizes and can be supplied according to customer’s design. Therefore they can be used in all those applications, in which traditional transformers are not fitting due to its size and/or weight.
Due to its specific features, Rogowski coil is an extremely comfortable solution for current measurement and can be used in a number of cases where traditional current transformer is not the adequate solution.
Specifications

Features:

  • Highlinearity from 1A to 100kA

  • Widedynamic range

  • With ashield against the influence of external magnetic fields.

  • No dangerfrom open-circuited secondary.

  • Not damagedby large overloads.

  • Non-intrusive,no power drawn from the main.

  • Measurementuniformity at any position of the conductor inside the coil.

  • IngressProtection Grade: IP67


Applications:

  • Electricitymeters

  • PowerQuality analyzer

  • Lightningcurrent detection system

  • Industrialelectric furnace current measurement

  • Arcfault current measurement

  • Transmissionline distributed fault detection system

  • Transientfilter type fault indicator


Characteristics:

MODEL

OFT-60

OFT-100

OFT-150

OFT-240

Reference Rated Current

600A

1000A

3000A

6000A

Ratio

Calibrated

85mV/kA@50Hz

100mV/kA@50Hz

50mV/kA

@50Hz

Uncalibrated

110mV/kA@50Hz

Read  Accuracy

Calibrated  <0.5% (central position, 25)

Uncalibrated  < 5% tolerance (central position, 25)

Maximum Current  Measurable

100kA

Coil  Resistance

from 100  to 250 Ω

Coil  Section

8mm

Lead Length

2meter

Temperature

Uncalibrated  200ppm/C

Calibrated  400ppm/C

Position  Error

±1%  maximum

      Output On  0A(Zero  Drift)     

≤0.1mV

Phase Error

≤0.5°

Linearity

±0.2% of  reading

Bandwidth

1Hz to  100kHz(-3dB)

Operating Temperature

-30  to 80

Storage Temperature

-40  to 90


Drawings