4.92
SEL-751A Relay Instruction Manual Date Code 20100129
Protection and Logic Functions
Global Settings (SET G Command)
Global Settings (SET G Command)
General Settings
The phase rotation setting tells the relay your phase labeling standard. Set
PHROT equal to ABC when B-phase current lags A-phase current by 120
degrees. Set PHROT equal to ACB when B-phase current leads A-phase
current by 120 degrees.
Figure 4.50 Phase Rotation Setting
Set the FNOM setting equal to your system nominal frequency. The DATE_F
setting allows you to change the relay date presentation format to the North
American standard (Month/Day/Year), the engineering standard (Year/
Month/Day), or the European standard (Day/Month/Year).
Set the SEL
OGIC equation FAULT to temporarily block maximum and
minimum metering, energy metering, and demand metering.
Event Messenger
Points
The SEL-751A can be configured to automatically send ASCII message on a
communications port when trigger condition is satisfied. Use the SET P
command to set PROTO := EVMSG on the desired port to select the port. This
feature is designed to send messages to the SEL-3010 Event Messenger,
however, any device capable of receiving ASCII messages can be used.
Table 4.39 General Global Settings
Setting Prompt Setting Range Setting Name := Factory Default
PHASE ROTATION ABC, ACB PHROT := ABC
RATED FREQ. 50, 60 Hz FNOM := 60
DATE FORMAT MDY, YMD, DATE_F := MDY
FAULT CONDITION SEL
OGIC FAULT := 50G1P OR 50N1P OR
51P1P OR 51QP OR 50Q1P OR TRIP
B
C
A
C
PHROT = ABC
A
PHROT = ACB
B
Table 4.40 Event Messenger Settings (Sheet 1 of 2)
Setting Prompt Setting Range
Setting Name :=
Facto ry Default
EVE MSG PTS ENABL N, 1–32 EMP := N
MESSENGER POINT
MP01 TRIGGER
Off, 1 Relay Word bit MPTR01 := OFF
MESSENGER POINT
MP01 AQ
None, 1 analog quantity MPAQ01 := NONE
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