Eaton Power Xpert PXM 4000, User And Installation Manual

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IM02601004E
Page 91
6 Functions on the Web Server Pages
Energy Comparison
The Energy Comparison page shows the same information as the Energy Profile, but allows you to
compare data as follows:
• This Week with Last Week
• This Month with Last Month
• 2 different Weeks
• 2 different Months
To locate this page, select Energy Comparison from the drop-down box.
Point Timestamp Wh Timestamp Wh
1 August 01, 2010 12:00 AM -0400 48620.69922 August 29, 2010 12:00 AM -0400 43385.19922
2 August 02, 2010 12:00 AM -0400 125228.00000 August 30, 2010 12:00 AM -0400 123068.00000
3 August 03, 2010 12:00 AM -0400 128115.00000 August 31, 2010 12:00 AM -0400 130590.00000
4 August 04, 2010 12:00 AM -0400 120393.00000 September 01, 2010 12:00 AM -0400 138424.00000
5 August 05, 2010 12:00 AM -0400 118050.00000 September 02, 2010 12:00 AM -0400 123612.00000
6 August 06, 2010 12:00 AM -0400 100662.00000 September 03, 2010 12:00 AM -0400 80656.00000
7 August 07, 2010 12:00 AM -0400 49797.69922 September 04, 2010 12:00 AM -0400 54777.50000
09/29/2010 09/01/2010
To: To:
08/29/2010 08/01/2010 2 different Months
From: From: Compare:
Comparison View
Energy Comparison
18 Aug 08 07:38:48
Last Demand Reset:
A Rate:
Active
-----------------------------------
Display Demand in Amps
Sum
Net
Delivered
Received
kVARh / kVAR
kVAh / kVA
Sum
Net
Reverse
Forward
kWh / kW
ENERGY / DEMAND
        
Energy
1 - NY Sales Office
11:33 AM -0400 Oct 08, 2010
QUALITY
The Quality section of the Power Xpert Meter outlines the measurements that have been calculated
and describes the health of the system. It consists of seven main sections of information, THD Cur-
rent, THD Voltage, K Factor, Crest Factor, Flicker and 9’s of Availability.
THD
The Total Harmonic Distortions (THD) is the ratio, expressed as a percent, of the rms value of the
ac signal after the fundamental component is removed and inter-harmonic components are ignored,
to the rms value of the fundamental. The formula for THD is provided below. The variables X
1
and
x
n
may represent either voltage or current and may be expressed either as rms or peak values, as
long as all are expressed in the same fashion.
X
1
= fundamental value of current or voltage.
x
n
= nth harmonic value of current or voltage.
CURRENT
The THD Current is calculated for peak phase A, B and, C as Amperes. Meanwhile, the TDD% is
calculated as a percentage of peak demand current. The THD Current is individually measured for
Odd, Even and Inter Harmonics. Maximum THD Current is determined using individual phase THD
Currents. All of the THD Current measurements in the Power Xpert Meter are trended and mini-
mum and maximum values are logged with date and time stamps.