Date Code 20010731 Setting the Relay 7-3
SEL-352-1, -2 Instruction Manual
ADDITIONAL RELAY SETTINGS
Group Settings (SET Command)
The SET command accesses settings that are specific for each of the three setting groups (1, 2,
or 3). All SET command settings are shown in this section in the order they appear in the setting
procedure with their ranges.
Relay Identification (RELID)
The relay identification (RELID) setting is a 17-character label for record keeping. Use any
keyboard character in the label. RELID is displayed each time the settings are displayed. It is
not displayed for any other report. This setting can be used for tracking the relay serial number
or relay type. For example:
RELID = SEL3521, 96268085
Terminal Identification (TRMID)
The terminal identification (TRMID) setting is a 39-character label for record keeping and
reporting. Use any keyboard character in the label. TRMID is displayed in many reports. This
setting can be used for tracking the identification of the terminal that the SEL-352 Relay is
monitoring. For example:
TRMID = BKR 2302, McCall - Parsons 230 kV Line
Nominal Breaker Trip Time (Topen)
The nominal time for the breaker to open (Topen) is for record keeping only. Enter the
manufacturer’s specification, timing test results, your best guess for breaker tripping times, or
results from previously recorded actual operations. The trip time is considered as the time
between the trip coil circuit energization and the breaker opening. An open breaker typically is
indicated by an auxiliary contact or the current dropout.
Nominal Breaker Close Time (Tclose)
The nominal time for the breaker to close (Tclose) is for record keeping and close anticipation
for synchronizing. Enter the manufacturer’s specification, timing test results, your best guess for
breaker closing times, or results from previously recorded actual operations. The close time is
considered as the time between the close coil circuit energization and the breaker closing. A
closed breaker is typically indicated by an auxiliary contact or the current pickup. The SEL-352
Relay can also indicate a closed breaker based on the lack of difference voltage across the
breaker.
Slow Trip Alarm (SlowTr)
SlowTr is the slowest time the breaker will take to open before declaring a failure mode. The ST
breaker alarm logic uses the SlowTr setting. After the TRIPA Relay Word bit asserts, the
SlowTr timer starts timing. If the current does not drop out based on the fixed threshold 50MNA
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