User's Manual

Operation: C1SD, C1ST, and C1SL Versions
CENTRON Meter Technical Reference Guide 5-21
Calculations
Energy
Calculation of energy is continuously incremented by multiplying the energy pulse
weight by the measured energy. The energy pulse weight is calculated by the
following formula:
The energy in a given interval is the product of the number of pulses received
during that interval times the pulse weight:
Demand
Calculation of demand is always based on rolling or block intervals. Demand
calculations use three constants; the watthour constant (Kh), the demand interval
length, and the register multiplier.
The weight of an incoming pulse is determined according to the following formula:
The demand in a given interval is the product of the number of pulses received
during that interval times the pulse weight:
The Demand value is continuously compared against the stored maximum value. If
a demand value is greater than the corresponding maximum demand, it is saved as
the new maximum demand. If the demand value is less than the corresponding
maximum demand, it is discarded. At the beginning of an interval, the current
interval demand is reset to zero and new demand values begin accumulating.
kWh Pulse Weight
kwh
Pulse
----------------
⎝⎠
⎛⎞
Kh 1000× Register Multiplier==
Energy kWh()Number of Pulses
kWh
Pulse
----------------
⎝⎠
⎛⎞
×=
kW pulse weight
kw
pulse
---------------
⎝⎠
⎛⎞
Kh 1000 Register Multiplier 60/Dem. Int. Lengt
h
××⁄=
Demand kW()Number of Pulses kW Pulse Weight×=