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I.L. 40-201.9
In order to change the "current value" of a particular settings function, "RAISE" or "LOWER" the
FUNCTION field until the desired function appears (e.g., "RP"). Then "RAISE" or "LOWER" the
values in the VALUE field until the desired value appears. If the "ENTER" key (recessed for se-
curity purposes) is depressed, the value which appears in the VALUE field will replace the "cur-
rent value" in memory; but only if the "VALUE ACCEPTED" LED flashes once to indicate that
the value has been successfully entered into the system.
For reasons of security, a plastic screw is used to cover the ENTER key. A wire can be used to
lock the plastic screw and to prevent any unauthorized personnel from changing the settings.
4.2.
Metering (Volts/Amps/Angle) Mode
When the Volts/Amps/Angle LED is selected by the "Display Select" key, the phase A, B, C volt-
ages, currents and phase angles are available for on-line display during normal operation. All
measured values can be shown by scrolling the "Raise" or "Lower" key in the FUNCTION field.
The values on the display are dependent on the settings of RP (read primary); RP= YES for the
primary side values and RP = NO for the secondary values. Conditions such as channel re-
ceive, channel transmit and loss-of-potential can also be monitored. The function names and
values are shown in Table 4-5 (
NOTE:
4.3.
Target (LAST and PREVIOUS FAULT) Mode
The last two Fault records are assessable at the Front panel. The "LAST FAULT" information
is of the most recent fault, the "PREVIOUS FAULT" information is of the fault prior to the "LAST
FAULT". These displays contain the target information along with the "Frozen" data at the time
of trip. The "LAST FAULT" register shows one or two records stored by flashing the LED once
or twice per second, respectively.
Different types of faults with related descriptions are shown in Table 4-6. As soon as a fault
event is detected, the most recent two sets of target data are available for display. The "LAST
FAULT" is the data associated with the most recent trip event. The "PREVIOUS FAULT" con-
tains the data from the prior trip event. If a single fault occurs, the "LAST FAULT" LED flashes.
If a reclosing is applied and the system trips, the original "LAST FAULT" information will be
transferred to the "PREVIOUS FAULT" memory. The latest trip information will be stored in the
"LAST FAULT" memory, and its LED flashes twice per second. To reset the flashing LEDs, de-
press the "Target Acknowledge" key once. To reset the target information in "LAST FAULT" and
"PREVIOUS FAULT", see the foregoing procedure (
There are 2 ways to reset the targets:
• Using the "Target Reset" Contact Input.
• With the INCOM command, using the communication channel.
4.4.
Test Mode Function
The test display mode provides diagnostic and testing capabilities for REL 352. Relay status
display, local delay time computation, and relay testing are among the functions provided. The
test mode functions are listed in Table 4-1.
4-4
page 4-17
All displayed Phase Angles use V
Power Automation and Protection Division
).
as reference.
A
in section 3.3, Key Switches
).
REL 352 Version 1.00
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