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4.98
SEL-787 Relay
Instruction Manual
Date Code 20081022
Protection and Logic Functions
Front-Panel Settings (SET F Command)
Following are examples of selected display point settings, showing the
resulting front-panel displays. For example, at a certain station we want to
display the status of both HV and LV circuit breakers of Transformer 1. When
the HV circuit breaker is open, we want the LCD display to show:
TRFR 1 HV
BRKR: OPEN
, and when the HV circuit breaker is closed, we want the display to
show:
TRFR 1 HV BRKR: CLOSED
. We also want similar displays for the LV
breaker.
After connecting a form a (normally open) auxiliary contact from the HV
circuit breaker to Input
IN101
and a similar contact from the LV circuit breaker
to Input
IN102
of the SEL-787, we are ready to program the display points,
using the following information for the HV breaker (LV breaker similar):
➤
Relay Word bit—IN101
➤
Alias—TRFR 1 HV BRKR:
➤
Set String—CLOSED (the form a [normally open] contact
asserts or sets Relay Word bit IN101 when the circuit breaker is
closed)
➤
Clear String—OPEN (the form a [normally open] contact
deasserts or clears Relay Word bit IN101 when the circuit
breaker is open)
Name, Alias, Set String, and Clear String
When all four strings have entries, the relay reports all states.
shows the settings for the example, using the
SET F
command.
Use the
>
character to move to the next settings category.
Table 4.51
Settings That Always, Never, or Conditionally Hide a Display Point
Programmable Automation Controller
Setting
Name
Alias
Set String
Clear String
Comment
DP01 := IN101,TRFR1,CLOSED,OPEN
IN101
TRFR1
CLOSED
OPEN
Never hidden
DP01 := IN101,TRFR1
IN101
TRFR1
—
—
Never hidden
DP01 := NA
—
—
—
—
Always hidden
DP01 := IN101,,,
IN101
—
—
—
Always hidden
DP01 := IN101,TRFR1,,
IN101
TRFR1
—
—
Always hidden
DP01 := IN101,TRFR1,CLOSED,
IN101
TRFR1
CLOSED
—
Hidden when IN101 is deasserted
DP01 := IN101,"TRFR 1",,OPEN
IN101
TRFR 1
—
OPEN
Hidden when IN101 is asserted
Table 4.52
Entries for the Four Strings
Name
Alias
Set String
Clear String
IN101
TRFR 1 HV BRKR
OPEN
CLOSED
Содержание SEL-787
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