© 2008 Siemens Energy & Automation, Inc. All Rights Reserved.
PMCM-9340D-0208 ACCESS 9340 and 9360 Meters
2/2008 Chapter 5—Input/Output Capabilities
EN–67
Calculating the Kilowatthour-Per-Pulse Value
This section shows an example of how to calculate kilowatthours per
pulse. To calculate this value, first determine the highest kW value
you can expect and the required pulse rate. In this example, the
following assumptions are made:
• The metered load should not exceed 1600 kW.
• About two KY pulses per second should occur at full scale.
Step 1: Convert 1600 kW load into kWh/second.
Step 2: Calculate the kWh required per pulse.
Step 3: Adjust for the KY initiator (KY will give one pulse per two
transitions of the relay).
Step 4: Round to nearest hundredth, since the meter only accepts
0.01 kWh increments.
(1600 kWh)
1 hour
-------------------------------
X kWh
1 second
------------------------=
(1600 kWh)
3600 seconds
-------------------------------------
X kWh
1 second
------------------------=
X 1600/3600 0.444 kWh/second==
(1600 kW)(1 Hr) 1600 kWh=
0.444 kWh/second
2 pulses/second
------------------------------------------------- 0 . 2222 kWh/pulse=
0.2222 kWh/second
2
----------------------------------------------------- 0.1111 kWh/pulse=
Ke 0.11 kWh/pulse=
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