Sel SEL-DTA2, Инструкция по эксплуатации

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2.4
SEL-DTA2 Instruction Manual
Date Code 20020329
Specifications
Display Modes
Line 2.
Display line two contains the real power in MW and reactive
power in MVAR. When Fast Meter is available and enabled, three
times the negative-sequence current (3I2) in rms amps is displayed
preceding the power quantities.
Line 3 .
Display line three contains phase-to-neutral voltage data in rms
kV. When Fast Meter is available and enabled, three times the zero-
sequence voltage (3V0) in rms kV is displayed following the phase-to-
neutral voltages. If the SEL-DTA2 is connected to an SEL-121F Relay,
the synchronizing voltage (VS) in rms kV is displayed following the
phase-to-neutral voltages.
Line 4 .
Display line four contains phase-to-phase voltage data in rms kV.
If Fast Meter is available and enabled, three times the negative-
sequence voltage (3V2) in rms kV is displayed following the phase-to-
phase voltages.
Additional lines containing demand and peak-demand meter values are
available when the SEL-DTA2 is connected to a relay that supports those
functions.
Figure 2.5 Example Meter Display
The SEL-DTA2 remains in the METER operating mode until a new fault is
reported, the mode is manually exited by pressing the “CLEAR” control, or
another display mode is activated by pressing the corresponding control.
Additionally, the METER mode can be pre-empted by the STATUS mode via
detection of a relay status warning.
Pressing “METER” once toggles display updating, showing the present meter
values until the button is pressed again. Pressing “METER” an even number
of times freezes the meter display. A frozen meter display is identified by a “:”
following the meter quantity label as shown in Example Frozen Meter
Display. Press “METER” again to release the display. The analog output
channels are continuously updated regardless of display mode.
Figure 2.6 Example Frozen Meter Display
Standard Meter.
The instrument updates the display with new data
approximately every five seconds.
Fast Meter.
The SEL-DTA2 is capable of updating and displaying meter
data every 0.5 seconds using binary Fast Meter data transfer. The
SEL-DTA2 automatically attempts the Fast Meter function when
initially connected to an SEL relay. In some SEL relays, Fast Meter is
supported automatically in a specific serial port. Other SEL relays
have a port Automatic Message setting that needs to be set to DTA in
order for the SEL-DTA2 to receive the Fast Meter messages. Refer to
your relay instruction manual to get specific information about port
settings and Fast Meter support.
If the SEL relay does not support Fast Meter, the SEL-DTA2 defaults
to the standard meter function. Fast Meter data transfer allows for fast
MET IA=994 B=995 C=994
P=350.90 Q=67.80
VA=133.5 VB=134.0 VC=133.5
AB=230.5 BC=231.0 CA=230.5
MET IA=994 B=995 C=994
P=350.90 Q=67.80
VA=133.5 VB=134.0 VC=133.5
AB=230.5 BC=231.0 CA=230.5
Displayed
Data
Displayed
Data