Satec Expertmeter EM720 Operation Manual page 71

Chapter 5 Configuring the EM720
Display
Label
Power Mode
Energy Roll
End of Bill
Test Mode
Pulse Const
N/A
N/A
EM720 Power Quality and Revenue Meter
The following table lists available device options.
Parameter Options
Power S=f(P, Q) (reactive
Calculation power mode),
Mode
Q=f(S, P) (non-
active power
mode)
Energy Roll 1000.0
Value, kWh
10000.0
100000.0
1000000.0
10000000.0
100000000.0
End of Billing Auto (monthly)
Period
Auto/COM
Auto/COM/Manual
COM
Manual
Energy LED OFF (disabled)
Test
ON (enabled)
Energy LED 0.01-0.25 Wh/imp
pulse rate,
(100,000 – 4,000
Wh/impulse
imp/kWh)
Volts Scale, V 60-600 V
Amps Scale, A 1.0 – 50.0
Power Calculation Modes
The power calculation mode option allows you to change
the method for calculating reactive and apparent powers
in presence of high harmonics. The options work as
follows:
1. When the reactive power calculation mode is
selected, active and reactive powers are measured
directly and apparent power is calculated as:
2. This mode is recommended for electrical networks
with low harmonic distortion, commonly with THD <
5% for volts, and THD < 10% for currents. In
networks with high harmonics, the following method
is preferable.
3. When the non-active power calculation mode is
selected, active power is measured directly,
apparent power is taken as product S = V x I,
where V and I are the RMS volts and amps, and
reactive power (called non-active power) is
calculated as:
Default
Power/Energy Options
S=f(P, Q)
100000000.0
Auto
(monthly)
Test Mode
Disabled
0.10 Wh/imp
(10,000
imp/kWh)
Data Scales
144 V
2A/10 A
2 2
S = P + Q
General Meter Setup
Description
The method used for calculating
reactive and apparent powers (see
"Power Calculation Modes" below)
The value at which energy
counters roll over to zero
Triggering an end of billing period:
Auto – monthly self-reading
COM – remote via communications
Manual – from the front display
Setting this option puts the meter
into TEST mode
Test LED pulse constant - the
amount of accumulated energy (in
secondary readings) giving one
pulse via "kWh" and "kvarh" LEDs.
The maximum voltage scale
allowed, in secondary volts. See
in Appendix F
Data Scales
The maximum current scale
allowed, in secondary amps. See
in Appendix F
Data Scales
71