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coolyaar
Power-User

Join Date: Jul 2011
Posts: 286
Good Answers: 1

S3WR power transducer

11/16/2011 9:05 AM

power transducer S3-WRVP from unidata,italy (4-20mA) is installed in our local panel (440VAC) for sending power flow through local panel to control room.at a load of 150kw , the transducer output should be nearly 6.3mA , however it outputs a current of about 11mA. i have tested all combination of dip switches, yet the problem is persistent.

help needed please.
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Anonymous Poster #1
#1

Re: S3WR power transducer

11/16/2011 9:16 AM

http://www.unidata.it/en/contatti
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TonyS
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United Kingdom - Member - New Member

Join Date: Aug 2010
Location: Resting under the Major Oak
Posts: 4347
Good Answers: 181
#2

Re: S3WR power transducer

11/16/2011 10:29 AM

RTFI

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PeterT
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Join Date: May 2010
Location: Liverpool, NY
Posts: 961
Good Answers: 131
#3

Re: S3WR power transducer

11/16/2011 11:48 AM

Make sure the current and voltage inputs are connected in proper phase relationships. If you are using VTs and CTs, make sure their configuration and ratios are correct. Verify that the transducer is designed for your desired full-scale output. Calibrate the zero and span settings properly so that you get 4mA out for zero input and 20mA out for full-load input. If you do all these things, the transducer should give you the correct value.

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67model
Guru

Join Date: Dec 2010
Posts: 1686
Good Answers: 116
#4

Re: S3WR power transducer

11/16/2011 6:49 PM

11 mA/6.3 mA = 1.746.

Pretty close to √3 = 1.732.

Power in 3 phase is VI√3 and line voltage = √3 x Phase voltage.

I wonder if some one got confused when they worked out the requirements?????
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