We have a requirement of measuring/sensing 3 phase transformer current (1000A range) using rogowski cable .The output of this cable is fed to the low stage gain and high stage gain integrator circuit and it is then fed to the microcontroller .The microcontroller converts the analog signals to digital (with internal adc) and the final output is obtained.
Currently we are using a discrete integrator circuitry for integrating the output of the rogoswki coil .Our requirement is to replace the discrete integrator circuits between the Rogowski coil and microcontroller with an IC for current sensing.Kindly suggest us any 3 phase rogowski coil current sensing solution that takes 3 phase(R,Y,B) coil input and provides direct digital output of the current measured to the controller.
kindly suggest us if there is any module solution that senses 3 phase transformer current and gives a digital output directly.
I don't think that TI has a current sensing chip with an integrated integrator. But you could adopt the method shown in TIDA-01063, performing the integration with a digital integrator by using a simple IIR digital integration algorithm.
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I checked with our current sense product team and unfortunately they do not have an integrated product that satisfies your 3-phase Rogowski coil current sensing requirement.
Precision Amplifiers Applications Engineering
In reply to Thomas Kuehl:
is there any other way that you can suggest us to sense the current from 3 phase transformer by rogowski coil and get a digital output of the measured current ?
In reply to Vishal A1:
I searched for Rogowski coil solutions on TI.com and these resources seemed to be applicable to your application:
The first TI Design provides information about an analog amplifier and integrator that can be used to interface a Rogowski coil in a signal chain. The bullets state that the design can be interfaced to MSP430F6779 Metering SoC for Accuracy Measurement, and the ADS131E08 analog-to-digital converter. This is a single phase solution so there would have to be 3x channels for a 3-phase application.
TI Designs - Active Integrator for Rogowski Coil Reference Design With Improved Accuracy for Relays and Breakers
The second TI-Design is intended for a 3-phase Rogowski E-Meter application, but could be applicable in concept to what you are doing:
TI Designs - Three Phase Rogowski Coil Based E-Meter Solution
I hope this information helps provide you with some direction on your project.
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