Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watmath!clyde!rutgers!mtune!mtx5c!mtx5d!dwj
From: dwj@mtx5d.UUCP
Newsgroups: sci.electronics
Subject: Re: Domestic KiloWatt Hour Meters
Message-ID: <834@mtx5d.UUCP>
Date: Thu, 23-Apr-87 12:16:44 EST
Article-I.D.: mtx5d.834
Posted: Thu Apr 23 12:16:44 1987
Date-Received: Sat, 25-Apr-87 05:15:46 EST
References: <923@mhuxh.UUCP> <1715@kitty.UUCP> <555@neoucom.UUCP>
Organization: AT&T Information Systems, Middletown, NJ 07748-4801.
Lines: 24

> It seems to me like the process of metering that Larry described:
>       <P> = <I1><E1> + <I2><E2>
> is the measure of instantaneous *REAL* power consumed by the load,
> as opposed to *REACTIVE* power in the circuit, whcih would not
> actually be energy consumed in the load.
> [The reactive load would ] cause (I**2)*R power loss in the
> power co.'s lines to the customer.
> 
> In essence real power woud be:
>       p(t)=v(t)i(t)cos(theta), theta being the phase angle time
>   --Bill

When talking to a 'power' engineer (5-6yrs) ago, he said that
the phase angle had been realativly insignificant in residential
uses (lights, stove, hot-water and heaters are all resistive).

Industrial users, however, had their power factors measured and were
billed at some rate, set by the PUC.  This put the incentive
on the industrial users to get their power factors down by using
synchronous moters and capacitor banks.
					david james
					mtx5d!dwj
					201-957-1652
					AT&T - ISL