Re: Can you identify this "pole transformer" looking thing . . .????

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Bert Hickman by way of Terry Fritz <teslalist-at-qwest-dot-net>" <bert.hickman-at-aquila-dot-net>

Hi Dan,

Those are oil-immersed motor-driven relays used to switch the PFC capacitor 
bank into/out of the circuit as necessary. Some distribution lines 
experience fluctuating inductive loads (office buildings or stores with 
fluorescent lighting, large industrial motors, etc.) that introduce voltage 
sags from lagging power factor only some of the time. To improve voltage 
regulation and power distribution efficiency on these lines, the power 
company often installs a switchable capacitor bank in conjunction with 
sensing circuitry. When the distribution feeder's voltage sags due to an 
increasingly lagging power factor, the relays connect the capacitor bank to 
compensate. A small step down transformer provides LV power for these relays.

Best regards,

-- Bert --
-- 
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Tesla list wrote:
>Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
><dhmccauley-at-spacecatlighting-dot-com>
>While driving, I often look above at the beautiful power lines and lust over
>all those huge pole transformers.
>However, I noticed every once in awhile (maybe every half-mile), you'll see
>(3) giant capacitors (rectangular type) on the three-phase high voltage
>which are obviously used for power factor correction on the lines but it
>looks like in parallel with each of the caps are (3) tiny pole transformer
>looking objects with two bushings out the top.  They are probably about a
>foot high each and about six inches
>in diameter.  (Maybe a bit larger)  Anyone know what these are?  Are they
>perhaps another capacitor??
>The Captain
>
>.