4.82
SEL-787 Relay
Instruction Manual
Date Code 20081022
Protection and Logic Functions
Global Settings (SET G Command)
If the contact fail-safe is enabled, the relay output is held in its energized
position when relay control power is applied. The output falls to its de-
energized position when control power is removed. Contact positions with de-
energized output relays are indicated on the relay chassis and in
and
.
When TRIP output fail-safe is enabled and the
TRIP
contact is appropriately
connected (see
), the breaker is automatically tripped when relay
control power fails.
M
IRRORED
B
ITS
Transmit SEL
OGIC
Control Equations
See
and
for details.
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.
Table 4.33
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, DMY
DATE_F := MDY
FAULT CONDITION
SEL
OGIC
FAULT := 51P1P OR 51P2P OR 51G1P OR 51G2P OR
51N1P OR TRIP
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 := (blank)
•
•
•
•
•
•
•
•
•
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 := (blank)
Summary of Contents for SEL-787
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