SATEC EM920 Operation Manual - Manual (Page 73)

Chapter 5 Configuring the EM920
General Meter Setup
EM920 Power Quality and Revenue Meter 73
Display Label Parameter Options Default Description
Nom. Voltage PT Secondary (L-L)
Voltage
50-480 V 120 V The nominal secondary line-to-
line voltage. Used as a
reference voltage for the
EN50160 evaluation.
CT Primary CT Primary Current 1 1-20,000 A 5 A The primary rating of the phase
current transformer
CT4 Primary I4 CT Primary
Current 1-20,000 A 5 A The primary rating of the I4
current transformer
Nom.
Frequency Nominal Frequency 50, 60 Hz 60 Hz The nominal line frequency
Demand Setup
Power Dmd.
Period Power block demand
period 1, 2, 3, 5, 10,
15, 20, 30, 60
min
15 min The length of the demand
period for power demand
calculations.
Num. Dmd.
Periods Number of Blocks in
Sliding Demand 1-15 1 The number of blocks to be
averaged for sliding window
demands
Dmd. Sync.
Source Power Demand Sync
Source Meter clock,
DI1-DI10 Meter
clock The source input for
synchronization of the demand
intervals. If a digital input is
selected as the source, a pulse
front denotes the start of the
demand interval
Volt. Dmd.
Period Volt Demand Period 0-9000 sec 900 sec The length of the demand
period for volt demand
calculations
Amp. Dmd.
Period
Ampere Demand
Period
0-9000 sec 900 sec The length of the demand
period for ampere demand
calculations
Hrm. Dmd.
Period THD Demand Period 0-9000 sec 900 sec The length of the demand
period for THD demand
calculations
TDD Setup
Max. Dmd.
Load I Max. Load Current 0 – 20,000 A
0 = CT primary
0 The maximum demand load
current for phase current inputs
I4 Max. Dmd.
Load I4 Max. Load Current 0 – 20,000 A
0 = CT primary
0 The maximum demand load
current for I4 current input
1 The maximum value for the product of the CT primary current
and PT ratio is 57,500,000. If the product is greater, power
readings are zeroed.
Available wiring modes are listed in the following table.
Wiring Mode Description
3OP2 3-wire Open Delta using 2 CTs (2 element)
4LN3 4-wire Wye using 3 PTs (3 element), line-to-neutral voltage readings
3DIR2 3-wire Direct Connection using 2 CTs (2 element)
4LL3 4-wire Wye using 3 PTs (3 element), line-to-line voltage readings
3OP3 3-wire Open Delta using 3 CTs (2½ element)
3LN3 4-wire Wye using 2 PTs (2½ element), line-to-neutral voltage readings
3LL3 4-wire Wye using 2 PTs (2½ element), line-to-line voltage readings
NOTE
In 4LN3 and 3LN3 wiring modes, the voltage readings for volt
demands represent line-to-neutral voltages; otherwise, they
will be line-to-line voltages. The voltage waveforms and
harmonics in 4LN3 and 3LN3 wiring modes represent line-to-
neutral voltages; otherwise, they will be line-to-line voltages.