Bulletin No. 3020IM9503R6/98 Power Meter
December 1998 Chapter 8—Metering Capabilities
1998 Square D All Rights Reserved 63
Demand Power Calculation Methods
To be compatible with electric utility billing practices, the power meter
provides the following types of demand power calculations:
• Sliding Block Interval Demand (PM-620 and PM-650 only)
• Block Interval Demand with Rolling Subinterval (PM-650 only)
• Synch to Comms (PM-650 only)
Block interval demand can be set up using the power meter display. Block
interval demand with a subinterval and sync to comms must be set up over
the communications link. A brief description of these three demand power
calculations follows.
Sliding Block Interval Demand
The block interval demand mode supports a sliding block interval calculation.
The default interval is 15 minutes.
In the sliding block interval mode, you can select a demand interval from 1 to
60 minutes in 1-minute increments. (The demand interval is set in the Setup
Mode. See Chapter 7 for details.) If you specify an interval of 1 to 15 minutes,
the demand calculation updates every 15 seconds on a sliding window basis.
Table 8-4
Demand Readings
Demand Reading Reportable Range
Demand Current, Per-Phase & Neutral
Present 0 to 32,767 A
Peak 0 to 32,767 A
Demand Real Power, 3Ø Total
Present 0 to +/-3,276.70 MW
Peak 0 to +/-3,276.70 MW
Demand Reactive Power, 3Ø Total
Present 0 to +/-3,276.70 MVAr
Peak 0 to +/-3,276.70 MVAr
Demand Apparent Power, 3Ø Total
Present 0 to 3,276.70 MVA
Peak 0 to 3,276.70 MVA
Predicted Real Power Demand ➀➁ 0 to ±32,767 kW ➂
Predicted Reactive Power Demand ➀➁ 0 to 32,767 kVAr ➂
Predicted Apparent Power Demand ➀➁ 0 to 32,767 KVA ➂
DEMAND READINGS (PM-620 AND PM-650 ONLY)
Power meter models PM-620 and PM-650 provides both current and power
demand readings (table 8-4).
➀ PM-650 only.
➁ Via communications only.
➂ 3-phase total.
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