4.12
SEL-700G Relay
Instruction Manual
Date Code 20170814
Protection and Logic Functions
Group Settings (SET Command)
Differential Element Output Logic.
Relay Word bits 87R and 87U, shown
in Figure 4.7, are high-speed elements that must trip all breakers. The assigns
87R and 87U (along with other protection elements) to assert four Relay Word
bits (TRIPX, TRIP1, TRIP2, and TRIP3) to shut down the generator.
Select GEN or TRANS for E87 to configure the differential element for
generator or transformer protection, respectively.
When E87 := TRANS, use the highest expected transformer rating, such as
the forced oil and air cooled (FOA) rating or a higher emergency rating, when
setting the maximum transformer capacity (MVA). When a value is entered in
Table 4.3
Differential Element Settings
Setting Prompt
Setting Range
Setting Name :=
Factory Default
PHASE DIFF EN
GEN, TRANS, NONE
E87 := GEN
MAX XFMR CAP
OFF, 0.2-5000.0 MVA
MVA := OFF
DEFINE CT COMP
Y, N
ICOM := N
X SIDE CT COMP
0, 12
CTCX := 0
Y SIDE CT COMP
0, 1, 5, 6, 7, 11, 12
CTCY := 0
WDG-X L-L VOLTS
0.20-1000.00 kV
VWDGX := 13.80 kV
WDG-Y L-L VOLTS
0.20-1000.00 kV
VWDGY := 138.00 kV
X SIDE CURR TAP
0.50–31.00 A
a
a
Range shown is for I
NOM
= 5 A; range for I
NOM
= 1 A is 0.1—6.20 A.
TAPX := 2.09
Y SIDE CURR TAP
0.50–31.00 A
a
TAPY := 2.09
OPERATE CURR LVL
0.10–1.00 TAP
O87P := 0.30
UNRES CURR LVL
1.0–20.0 TAP
U87P := 10.0
DIFF CURR AL LVL
OFF, 0.05–1.00 TAP
87AP := 0.15
DIFF CURR AL DLY
1.00–120.00 s
87AD := 5.00
RESTRAINT SLOPE1
5–90 %
SLP1 := 25
RESTRAINT SLOPE2
5–90 %
SLP2 := 70
RES SLOPE1 LIMIT
1.0–20.0 TAP
IRS1 := 6.0
2ND HARM BLOCK
OFF, 5–100 %
PCT2 := OFF
4TH HARM BLOCK
OFF, 5–100 %
PCT4 := OFF
5TH HARM BLOCK
OFF, 5–100 %
PCT5 := OFF
5TH HARM AL LVL
OFF, 0.02–3.20 TAP
TH5P := OFF
5TH HARM AL DLY
0.00–120.00 s
TH5D := 1.00
HARMONIC RESTRNT
Y, N
HRSTR := N
HARMONIC BLOCK
Y, N
HBLK := Y
HI SECURITY MODE
SEL
OGIC
HSM := 0
HI SECURITY PU
AUTO, O87P–2.00
O87P2 := 1.25
EXT FLT DET DO
1.00–30.00 s
HSMDOT := 10.00
Summary of Contents for SEL-700G Series
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