4.95
Date Code 20170814
Instruction Manual
SEL-700G Relay
Protection and Logic Functions
Group Settings (SET Command)
The negative-sequence time-overcurrent element 51QmT responds to the 3I2m
current as shown in Figure 4.59.
Figure 4.59
Negative-Sequence Time-Overcurrent Elements
False negative-sequence current can appear transiently when a circuit breaker
is closed and a balanced load current suddenly appears. To avoid tripping for
Table 4.22
Negative-Sequence Time-Overcurrent Settings
Setting Prompt
Setting Range
Setting Name :=
Factory Default
a
a
m = X or Y.
NSEQ TOC LEVEL
OFF, 0.50–16.00 A
b
b
Setting range shown is for 5 A nominal CT rating. Divide by 5 for 1 A CTs.
51QmP :=OFF
NSEQ TOC CURVE
U1–U5, C1–C5
51QmC := U3
NSEQ TOC TDIAL
0.50–15.00
c
,
0.05–1.00
d
c
Setting range shown is for 51_C := U_.
d
Setting range shown is for 51_C := C_.
51QmTD := 3.00
EM RESET DELAY
Y, N
51QmRS := N
CONST TIME ADDER
0.00–1.00 s
51QmCT := 0.00
MIN RESPONSE TIM
0.00–1.00 s
51QmMR := 0.00
NSEQ TOC TRQCTRL
SEL
OGIC
51QmTC := 1
q
From Figure 4.54
w
From Figure 4.89
e
From Figure 4.55
51QYP
Setting
51QYTC
Torque Control Switch
Torque
Control
51QYP
(Pickup)
51QYR
(Reset)
51QYT
(Curve
Timeout)
Torque
Control
Torque Control
State Switch
Position
Logical 1
Closed
Logical 0
Open
Setting
51QYRS =
Reset Timing
Y
Electromechanical
N
1
Cycle
Relay
Word
Bits
SEL
OGIC
Setting
51QYT Phase
Time-Overcurrent Element
Curve Timing and Reset Timing
Settings
51QYP
Pickup
51QYC
Curve
Type
51QYTD Time
Dial
51QYRS Electromechanical
Reset? (Y/N)
51QYCT
Const. Time Add.
51QYMR Min.
Response
51QmP
|3I2m|
Setting
51QmTC
Torque Control Switch
SEL
OGIC
Torque Control
51QmP
(Pickup)
51QmR
(Reset)
51QmT
(Curve
Timeout)
Relay
Word
Bits
SEL
OGIC
Setting
51QmT Phase
Time-Overcurrent Element
Curve Timing and Reset Timing
Settings
51QmP Pickup
51QmC Curve
Type
51QmTD Time
Dial
51QmRS Electromechanical
Reset? (Y/N)
51QmCT
Const. Time Add.
51QmMR Min.
Response
(a)
Intertie Protection (SEL-700G
T)
(
b)
Feeder Protection (SEL-700GW)
QY1DIR
51QmTC Torque
Control
State Switch
Position
Logical 1
Closed
Logical 0
Open
Setting
51QmRS =
Reset Timing
Y
Electromechanical
N
1
Cycle
m = X or Y
|3I2Y| 1
2
3
Summary of Contents for SEL-700G Series
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