Schweitzer Engineering Laboratories SEL-700G1 - Table 4.22 Negative-Sequence Time-Overcurrent Settings; Figure 4.59 Negative-Sequence Time-Overcurrent Elements

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 :=
Factor y Defa ul t
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
SELOGIC
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
SELOGIC
Torque Control
51QmP
(Pickup)
51QmR
(Reset)
51QmT
(Curve
Timeout)
Relay
Word
Bits
SELOGIC
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-700GT)
(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