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<== Date ==> <== Thread ==>

Subject: Re: Analog data acquisition in an EMI environment
From: Paul Sichta <[email protected]>
To: Pavel Maslov <[email protected]>
Cc: EPICS Tech Talk <[email protected]>
Date: Wed, 30 Jan 2013 08:48:14 -0500
Pavel,
The power conversion folks here purchased a fiber optic current
transducer, the  LKCO Series Fiber Optic High Current Measurement
System from DynAmp.  Our range was 150 kA.  It's been tested to some
degree but not used in operations, yet.

-ps



On Wed, Jan 30, 2013 at 6:42 AM, Pavel Maslov <[email protected]> wrote:
> Hello all,
>
>
> We have an issue at the laboratory on how to acquire real-time analog data
> (high voltage ~10kV and current ~70 kA) into digital, in an environment with
> electro-magnetic interference.
>
> In order to get rid of the EMI one could transform analog to light. However,
> you get inaccuracies as a result of the transformation
> analog-light-analog-digital.
>
> I wonder, if any lab has experienced the same problem. If so, how did you
> resolve it? Also, are there any COTS data acquisition systems for measuring
> high voltage/current? After a brief Google search, I have stumbled upon the
> NI PXI Express Optical Sensor Interrogator. One of our labs is currently
> using it. However, it measures temperature/strain only.
>
> There's little we have come up with so far:
> 1. Current transducer. We are considering the NXCT F3 Optical Current Sensor
> (by Alstom). It does provide the required accuracy and is insensitive to
> EMI. Although they claim it's IEC 61850 compliant, I couldn't find any info
> on how to embed it in a control system.
> 2. As a voltage transducer we can take high-precision voltage dividers and
> are thinking of designing custom-made analog-to-light converters
> (transmitter) and light-to-digital receiver.
>
> The total number of sensors/signals to measure is on the order of 80-100.
> Since this is intended to be used in the ITER tokamak, there are constraints
> on the instrumentation/software to be used. In particular, it is proposed to
> use National Instuments architecture, together with the CODAC framework.
> Aslo, it has to be IEEE-1588 compliant (TCN).
>
> Any insights on the matter would be much appreciated!
>
>
>
> --
> Best regards,
>
>
> Pavel Maslov, MS
> Controls Engineer at Pulsed power Lab
> Efremov Institute for Electro-Physical Apparatus
> St. Petersburg, Russia
>
> Mobile: +7 (951) 672 22 19
> Landline: +7 (812) 461 01 01

Replies:
Re: Analog data acquisition in an EMI environment Pavel Maslov
References:
Analog data acquisition in an EMI environment Pavel Maslov

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