[GreenKeys] History - Why voltages and frequencies are chosen(5v & 3.3v l...

[Sheldon Daitch]

True enough.

The one primary side metering that we have is on a 69kV line and the
transformer, as best as I remember, was a 10 MVA unit.

That installation also had an interesting distribution situation.  We
were the primary user of the load off that transformer and there
was another user next door to us.  That user was metered on the
low side at their location and their power use was subtracted from
the primary side metering…..they paid their use and we paid the
difference.

73

Sheldon

From: Peter Gottlieb [mailto:hpnpilot at gmail.com]
Sent: Friday, November 23, 2012 8:10 PM
To: Sheldon Daitch
Cc: Peter Gottlieb; WA5CAB at cs.com; Greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] History - Why voltages and frequencies are chosen(5v & 3.3v l...

We got 99.4% efficient ones.

Peter

On Nov 23, 2012, at 6:04 AM, Sheldon Daitch <SDAITCH at bbg.gov<mailto:SDAITCH at bbg.gov>> wrote:



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[Most common industrial is 480/277 Wye grounded neutral. Larger facilities are "primary metered" at 13.8 kV and get better rates as the company bought and maintains MV switchgear and transformers. ]

Another reason to meter on the primary side, is that the customer eats (pays for) the losses in the transformers.

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