Schweitzer Engineering Laboratories SEL-787, Instruction Manual, Page: 161 / 564

4.83
Date Code 20081022 Instruction Manual SEL-787 Relay
Protection and Logic Functions
Global Settings (SET G Command)
Figure 4.53 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-787 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.
Set EMP to enable the desired number of message points.
Set each of MPTR xx ( xx = 01–32) to the desired Relay Word bits, the rising
edge of which defines the trigger condition.
MPAQ xx is an optional setting and can be used to specify an Analog Quantity
to be formatted into a single message as described next.
Use MPTX xx to construct the desired message. Note that by default the analog
quantity value, if specified, will be added at the end of the message, rounded
to the nearest integer value (see
Example 4.4 ).
EXAMPLE 4.4 Setting MPTXxx Using the Default Location of
Analog Quantity
MPTX01 := THE LOAD CURRENT IS
MPAQ01 value = 157.44
Formatted message out when triggered: THE LOAD CURRENT IS 157
Location and resolution of the analog quantity value within the message can
be specified by using “%.pf”, where,
% defines location of the value
p defines number of digits (up to 6, defaults to 6 if omitted)
f indicates floating point value (use %d if nearest whole number is
desired)
B
C
A
C
PHROT = ABC
A
PHROT = ACB
B