Siemens 9810 Series, User Manual, Page: 183 / 218

Measurements
Current and voltage in phase (resistive) Current leads voltage (capacitive) Current lags voltage (inductive)
Power demand
Power demand is a measure of average power consumption over a fixed time
interval.
NOTE: If not specified, references to demand are assumed to mean power
demand.
The meter measures instantaneous consumption and can calculate demand using
various methods.
Peak demand
Peak (or maximum) demand is the highest demand level recorded over the billing
period.
Power utilities generally bill commercial customers based on their peak usage
levels, called peak demand (in kW) and energy consumption (in kWh). Peak (or
maximum) demand is the highest demand level recorded over the billing period.
You can view peak demand values on your meter’s display.
Your meter calculates the average current demand and kW, kVAR and kVA
demand using sliding window demand methods. It supports coincident demand
values when a peak demand is detected.
Your meter’s default configuration is suitable for most applications, or you can
customize it for your specific application. You can configure the minimum time
between consecutive demand resets.
NOTE: If not specified, references to demand are assumed to mean power
demand.
Peak demand reset lockout
The demand reset lockout time sets the minimum time allowed between
consecutive demand resets; the meter ignores any attempts to reset demand that
occur within the lockout period.
The peak demand reset lockout period is user-configurable (typical default value
is 25 days).
See the ION Setup online help for instructions on how to configure demand peak
and the demand reset lockout period on your meter.
See the ION Reference, available from www.usa.siemens.com/pds, for detailed
information on how Sliding Window Demand modules measure and calculate
demand values.
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