4.170
SEL-751 Relay Instruction Manual Date Code 20170927
Protection and Logic Functions
Global Settings (SET G Command)
The METHRES setting governs how various metering functions behave when
the metered value is smaller than a fixed threshold. Refer to Small Signal Cut-
off for Metering on page 5.14 for more details.
Set the SEL
OGIC control equation FAULT to temporarily block maximum and
minimum metering, energy metering, and demand metering.
Event Messenger
Points
You can configure the SEL-751 to automatically send an ASCII message on a
communications port when the trigger condition is satisfied. Use the SET P
command to set PROTO := EVMSG on the desired port to select that port.
This feature is designed to send messages to the SEL-3010 Event Messenger,
however, you can use any device capable of receiving ASCII messages.
Set EMP to enable the number of message points you want.
Set each of MPTRxx (xx = 01–32) to the desired Relay Word bit, the rising
edge of which defines the trigger condition.
MPAQxx is an optional setting that you can use to specify an analog quantity
to be formatted into a single message as described next.
Use MPTXxx to construct the desired message. Note that by default the analog
quantity value, if specified, is added at the end of the message, rounded to the
nearest integer value (see Example 4.34).
Table 4.67 Event Messenger Settings
Setting Prompt Setting Range
Setting Name :=
Fac to ry Defa ult
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
MESSENGER POINT
MP01 TEXT
148 characters MPTX01 :=
•
•
•
•
•
•
•
•
•
MESSENGER POINT
MP32 TRIGGER
Off, 1 Relay Word bit MPTR32 := OFF
MESSENGER POINT
MP32 AQ
None, 1 analog quantity MPAQ32 := NONE
MESSENGER POINT
MP32 TEXT
148 characters MPTX32 :=
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