Current Transformer
Current position: Home > Rogowski Coil
Rogowski coil OFR Series
OFR is a current transformer fixed by cable ties based on Rogowski principle, particularly suitable for measurement in combination with portable devices.
OFR 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

OFR-100

OFR-150

OFR-200

Reference Rated Current

1000A

3000A

6000A

Ratio

Calibrated

85mV/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