Sel SEL-DTA2, Инструкция по эксплуатации

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2.5
Date Code 20020329
SEL-DTA2 Instruction Manual
Specifications
Display Modes
confirmation of voltage and current quantities during substation
switching operations.
The SEL-DTA2 performs meter calculations instead of the relay
during Fast Meter data transfer. The SEL-DTA2 uses a three-sample
average and updates selected outputs every 0.5 second. A signal
transition from zero to full scale will require three Fast Meter updates,
or 1.5 seconds.
If the SEL-DTA2 has defaulted to the standard meter function, it
automatically attempts the Fast Meter function every ten minutes.
You can manually initiate the Fast Meter function from the SEL-DTA2
by entering the
SET command. The SEL-DTA2 will initiate the Fast
Meter request once the settings have been accepted, with or without a
setting change. See
Command Descriptions on page 3.6 in Section 3:
Communications for information on the SET command.
You can confirm the Fast Meter function by observing the meter
display updating time.
Status
There are two ways to enter the STATUS mode.
1. Press the front-panel “STATUS” control.
2. A relay status warning forces the SEL-DTA2 into STATUS
mode.
When the “STATUS” control is pressed, the SEL-DTA2 checks the status of
the relay and displays the received status message (see Relay Status Message).
The “SCROLL” controls can be used to view any two lines of the message.
Figure 2.7 Relay Status Message
Upon automatic receipt of a relay status warning, the SEL-DTA2 enters the
STATUS mode. The display shows “RELAY STATUS WARNING” in
blinking characters above the message (see Relay Status Warning Message).
Pressing any operative front panel control acknowledges the condition, after
which the STATUS mode functions as previously defined.
Figure 2.8 Relay Status Warning Message
The SEL-DTA2 automatically exits the STATUS mode when it receives a fault
report; press “CLEAR,” “METER,” or “FAULTS” to exit manually.
Standby
Press the front panel “CLEAR” switch to enter the STANDBY mode; the
following display message indicates STANDBY:
The SEL-DTA2 remains in this mode until:
1. An active display mode is selected by pressing an operative
front panel switch, or
2. The SEL-DTA2 receives a relay status message, or
3. The relay reports a fault to the SEL-DTA2.
DATE: 01/04/90 Time: 08:50:30
OFFSET IP = 0 mV
RELAY STATUS WARNING
DATE: 01/04/90 Time: 08:50:30
SEL-DTA
RELAY ID STRING