ITRON Centron, Technical Reference Manual

Page: 62 / 100

Operation: C12.19 C1SD, C1ST, and C1SL Versions
52 CENTRON® Meter Technical Reference Guide
Projected Demand
Projected Demand is an estimate of the demand the meter will have accumulated by the end
of the current interval. This value is calculated by dividing the accumulated energy by the
amount of time accumulated in the interval. Projected demand is calculated upon request.
Projected demand is available for block and rolling demand only.
Peak Demand (Maximum Demand)
Peak Demand is the largest demand value that has occurred during any demand interval
since the last demand reset. At the end of a demand interval, the present demand is
compared with the current maximum demand register. If the present demand is greater, it is
transferred to the maximum demand. The maximum demand is reset to zero on a demand
reset. The date and time of the maximum demand are also recorded. Maximum demand is
used for block, rolling, and thermal demand types.
Coincident Demand
Coincident Demand is the energy demand required by a given customer or class of
customers during a particular time period. Coincident peak demand is the energy demand by
that group during periods of peak system demand. A customer's coincident peak demand is
usually calculated from meter readings taken at the time when the customer's demand is
likely to be highest. An energy provider may be more concerned with demand at a given
time when total customer demand is highest than they are with the peak demand of a given
customer during other times.
Multiple Peaks
The CENTRON meter can measure the top five maximum demands for the quantities
selected. The possible quantities include W d, W r, W net, and W uni.
Demand Reset
A demand reset can occur in both Normal and Alternate modes. A demand reset can occur
in four ways:
1 Through the optical port using a compatible programming device.
2
With the standard push-button demand reset switch located on the face of the meter
(Controls and Indicators (on page 43)).
3 Through the use of TOU scheduling for specific reset dates and times.
4
Through the use of programmable Billing Schedules and Self Reads.
When a demand reset is initiated, the following events occur:

As an indication of a demand reset, the display flashes all eights for six seconds.

The current maximum demand values are added to the corresponding Cumulative
Demand values

A snapshot is performed.