
4.16
SEL-734 Meter
Instruction Manual
Date Code 20090730
Metering
Maximum/Minimum Metering
Fast Meter (A5D1)
The SEL-734 reports Fast Meter Messages energy data as FLOAT32 values
for each phase. Fast Meter data is in primary Mega units, does not rollover,
and is not affected by scaling settings.
Fast Message (A546 Function Code 1-Data Read Request)
The SEL-734 reports Fast Messages in Kilo units that rollover at 999,999,999.
Maximum/Minimum Metering
View or Reset Maximum/Minimum Metering Information
Via Serial Port
Use the
MET M
command to display maximum/minimum metering and the
date and time associated for the following values:
The
MET R M
command resets the maximum/minimum metering values.
The power maximum and minimum values can be negative or positive,
indicating the range of power flow that has occurred since the last
MET R M
reset command. These functions simulate analog meter drag-hands, with the
maximum value representing the upper drag-hand and the minimum value
representing the lower drag-hand.
Via Front Panel
The metering and reset functions available via serial port commands
MET M
and
MET R M
are also available via the front-panel pushbuttons. See
.
Maximum/Minimum Metering Update and Storage
The maximum/minimum metering function is intended to reflect normal load
variations rather than fault conditions or outages. Therefore, maximum/
minimum values are updated only if the following conditions are met:
➤
DFAULT is deasserted (= logical 0).
➤
For Form 9 voltage values V
A,B,C
or Form 5 voltage values
V
AB,BC,CA
, the voltage is above the corresponding 25.0 V
secondary threshold.
➤
For current values I
A,B,C,N
the current is above the
corresponding 0.05 A secondary threshold.
Currents
I
A,B,C,N
Input currents (A primary)
Voltages
V
A,B,C
Input voltages (kV primary, Form 9 only)
V
AB,BC,CA
Input voltages (kV primary, Form 5 only)
Power
MW
3P
(P)
Three-phase megawatts (primary)
MVAR
3P
(Q)
Three-phase megavars (primary)
Содержание SEL-734
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