Re: Yokogawa Power Primer

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Sparktron01@xxxxxxxxxxx 

DC

The WT2010 (single phase) will read up to 600V, and 30A directly
(at 240VAC 7.2kW without PT's or CT's).  WT2030 has three "elements"
(V and I inputs) and can measure 3 phase power.  Will use all standard
PT's an CT's so with math scaling can measure accurately to MegaWatts
(NO BS).  Has on board integrator so it can also read load energy
(from Watt-secs to Mega-Watt Hours).

The key to the accuracy/repeatability of instrument is the current
measuring shunt (NIST traceable -- 6 milliohms) section in the instrument
plus use of separate farady cages between V and I inputs and digital
sections for noise and EMI/RFI isolation and rejection.

Bandwidth is DC and 2Hz to 500KHz, 16Bit A/D section 0.03% of
reading +0.03% of range basic instrument accuracy.  A QUALITY built 
instrument, ideal for production / field use.  I'm not aware of another
instrument by ANY manufacturer that comes close to its specifications
for typical electrical power measurements.  That's why it is king
(literally) among utilities.

See below URL for more info on unit.

http://www.yokogawa.com/tm/wtpz/wt2010/tm-wt2010_01.htm

I have used these instruments for better then 10 years, and they
are in a league by themselves.

Best Regards
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA. USA

 -------------- Original message ----------------------
From: "Tesla list" <tesla@xxxxxxxxxx>
> Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>
>
>
>
> Dave:
>
> What are the max power ratings for each of the three Yokogawa power
> measuring instruments you mentioned?  Any in the 10-20 kVA max range
> that could be used with pole pig powered coils?  Also, any for a
> range of 0-5 kVA for NST power range testing applications?
>
> Dr. Resonance
>
> >Folks
> >
> >I got this excellent power measurement primer from Yokogawa Electric
> >(Yokogawa Corporation of America [YCA] for us in the 'States).
> >
> >http://www.yokogawa.com/tm/tr/tm-tr0605_06.htm
> >
> >I use Yokogawa WT20xx, PZ4000, and WT3000 powermeters/analyzers
> >at work and they are the "top of the metrology pyramid" for AC power
> >measurement capability.   They are used pretty exclusively by power
> >utilities for substation/feeder loading surveys, large load power
> >monitoring, motor / transformer efficiency measurement, etc.
> >
> >I have been to their SOTA Tier 2 Calibration facility
> >in GA (Atlanta Region).  Their equipment is pricey (WT2010 single phase
> >wattmeter is 10k, 2030 or 3000 is 20k + options), but excellent deals can
> >occasionally be had on surplus market.  Alex Tajnsek picked up a
> >serviceable "second generation" WT2533 (predecessor to WT20xx series)
> >DSP wattmeter for $20 US (no joke) at the Richmond salvage yard in
> >a box buried under some tech manuals and miscellaneous parts.
> >
> >Yep, fully functional, and even had a still valid cal sticker on it... :^D
> >
> >So guess what we are going to use to measure power on his TC's???
> >
> >Best Regards
> >Dave Sharpe, TCBOR/HEAS
> >Chesterfield, VA. USA
> >
> >
>
>
>