4.34
SEL-787 Relay
Instruction Manual
Date Code 20081022
Protection and Logic Functions
Basic Protection
The maximum phase time-overcurrent elements, 51P1T and 51P2T, respond
to the highest of A, B, and C phase currents as shown
Figure 4.15
Maximum Phase Time-Overcurrent Elements 51P1T and 51P2T
Table 4.9
Winding n Maximum Phase Time-Overcurrent (n = 1 or 2)
Setting Prompt
Setting Range
Setting Name :=
Factory Default
PHASE TOC LEVEL
OFF, 0.50–16.00 A
a
,
0.10–3.20 A
b
a
For I
NOM
= 5 A.
b
For I
NOM
= 1 A.
51P
n
P := OFF
51P
n
P := OFF
PHASE TOC CURVE
U1, U2, U3, U4, U5, C1, C2, C3, C4, C5
51P
n
C := U3
PHASE TOC TDIAL
0.50–15.00
c
,
0.05–1.00
d
c
For 51_C := U_.
d
For 51_C := C_.
51P
n
TD := 3.00
EM RESET DELAY
Y, N
51P
n
RS := N
CONST TIME ADDER
0.00–1.00 sec
51P
n
CT := 0.00
MIN RESPONSE TIM
0.00–1.00 sec
51P
n
MR := 0.00
PH TOC TRQCTRL
SEL
OGIC
51P
n
TC := 1
Table 4.10
Residual Time-Overcurrent Settings (n = 1 or 2)
Setting Prompt
Setting Range
Setting Name :=
Factory Default
RES TOC LEVEL
OFF, 0.50–16.00 A
a
,
0.10–3.20 A
b
a
For I
NOM
= 5 A.
b
For I
NOM
= 1 A.
51G
n
P := OFF
51G
n
P := OFF
RES TOC CURVE
U1, U2, U3, U4, U5, C1, C2, C3, C4, C5
51G
n
C := U3
RES TOC TDIAL
0.50–15.00
c
,
0.05–1.00
d
c
For 51_C := U_.
d
For 51_C := C_.
51G
n
TD := 1.50
EM RESET DELAY
Y, N
51G
n
RS := N
CONST TIME ADDER
0.00–1.00 sec
51G
n
CT := 0.00
MIN RESPONSE TIM
0.00–1.00 sec
51G
n
MR := 0.00
RES TOC TRQCTRL
SEL
OGIC
51G
n
TC := 1
51PnP
|IPWn|
Setting
51PnTC
Torque Control Switch
SEL
OGIC
Torque Control
Pickup
Curve
Timeout
Reset
51PnP
51PnR
51PnT
51PnTC
Torque Control
State Switch
Position
Logical 1
Closed
Logical 0
Open
Setting
51PnRS =
Reset Timing
Y
Electromechanical
N
1
Cycle
Relay
Word
Bits
SEL
OGIC
Setting
(From Figure 4.14)
Note: n = 1 or 2 (Winding 1 or 2).
51PnT Phase
Time-Overcurrent Element
Curve Timing and Reset Timing
51PnP Pickup
51PnC Curve
Type
51PnTD Time
Dial
51PnRS Electromechanical
Reset? (Y/N)
51PnCT
Const. Time Add.
51PnMR Min.
Response
Settings
Summary of Contents for SEL-787
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