Schweitzer Engineering SEL-387-0, Instruction Manual

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5.7
Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Metering and Monitoring
Temperature Measurement (SEL-387-5 and SEL-387-6 Relays)
Temperature Measurement (SEL-387-5 and
SEL-387-6 Relays)
The relay accepts up to 12 RTD inputs from the SEL-2600A RTD Module at
any one of the ports. The SEL-387-5 and SEL-387-6 can use up to two
SEL-2600A RTD Modules (two ports), processing the temperatures of a total
of 24 RTDs.
=>> MET T <Enter>
XFMR 1 Date: 01/18/02 Time: 11:00:28.404
STATION A
RTDA Input Temperature Data (deg. C)
Communication Failure
RTDB Input Temperature Data (deg. F)
RTD 1B = 123
RTD 2B = 123
RTD 3B = 123
RTD 4B = 123
RTD 5B = 123
RTD 6B = 123
RTD 7B = 123
RTD 8B = 123
RTD 9B = 123
RTD 10B = 123
RTD 11B = 123
RTD 12B = 123
=>>
Station DC Battery Monitor
Use the station dc battery monitor in the SEL-387 to alarm for undervoltage
and overvoltage dc battery conditions and to view how station dc battery
voltage fluctuates during tripping, closing, and other dc control functions. The
monitor measures station dc battery voltage applied to the rear-panel terminals
labeled
Z25 ( + ) and Z26 ( – ). Access the station dc battery monitor settings
(DC1P, DC2P, DC3P, and DC4P) with the SET G command.
Instantaneous
Battery Voltage
Values
The MET serial port command provides instantaneous values of the station dc
battery voltage (Vdc). To obtain these values from the relay front panel, press
the
{METER}
pushbutton, use the arrow pushbuttons to highlight
VDC
, and then
press the {SELECT} pushbutton.
Undervoltage and
Overvoltage Alarms
The flexibility of SEL
OGIC®
control equations lets you create battery warning
and failure alarms that trigger when the station dc battery voltage falls below
or exceeds voltage thresholds.
Figure 5.2 shows the alarm logic and how
Relay Word bits DC1 to DC4 can be used with DC1P, DC2P, DC3P, and
DC4P threshold settings to create the alarms.
Figure 5.3 shows the warning
and alarm regions.