Schweitzer Engineering Laboratories SEL-787 - Figure 4.35 Volts;Hertz Inverse-Time Characteristic, 24 IC; Figure 4.36 Volts;Hertz Inverse-Time Characteristic, 24 IC

4.57
Date Code 20081022 Instruction Manual SEL-787 Relay
Protection and Logic Functions
Voltage-Based Protection
Figure 4.34 Volts/Hertz Inverse-Time Characteristic, 24IC = 0.5
Figure 4.35 Volts/Hertz Inverse-Time Characteristic, 24IC = 1
100
0.01
0.1
1
10
100
120 140 160 180 200
24C2T Operating Time
(seconds)
Volts/Hertz (%)
(24IP = 100%)
24ITD = 5.0
24ITD = 7.5
24ITD = 10.0
24ITD = 0.5
24ITD = 1.0
24ITD = 0.1
t
p
24 ITD
3V
sec
PTR••
freq
-----------------------------------------
FNOM
VNOM 10
3
⋅
--------------------------------
•
24 IP
100%
--------------
--------------------------------------------------------------------------------
⎝⎠
⎜⎟
⎜⎟
⎜⎟
⎜⎟
⎛⎞
1–
⎝⎠
⎜⎟
⎜⎟
⎜⎟
⎜⎟
⎜⎟
⎛⎞
0.5
----------------------------------------------------------------------------------------------------------
ondssec=
100
0.01
0.1
1
10
100
1000
24C2T Operating Time
(seconds)
120 140 160 180 200
Volts/Hertz (%)
(24IP = 100%)
24ITD = 5.0
24ITD = 0.5
24ITD = 1.0
24ITD = 0.1
24ITD = 10.0
24ITD = 7.5
t
p
24 ITD
3V
sec
PTR••
freq
-----------------------------------------
FNOM
VNOM 10
3
⋅
--------------------------------
•
24 IP
100%
--------------
--------------------------------------------------------------------------------
⎝⎠
⎜⎟
⎜⎟
⎜⎟
⎜⎟
⎛⎞
1–
⎝⎠
⎜⎟
⎜⎟
⎜⎟
⎜⎟
⎜⎟
⎛⎞
1
------------------------------------------------------------------------------------------------------
ondssec=