Siemens SG8158-00 사용자 설명서
Appendix A: Trip Curves & Equations
Siemens Energy & Automation, Inc.
57
Table A.2 Under/Overvoltage Coefficients
Equation A.5 Overvoltage Equation
Equation A.6 Undervoltage Equation
Over/Undervoltage Coefficients
Curve Type
Des.
A
1
B
1
N
1
t
r
Inverse
0.51
-1.75
0.50
---
Mod. Inverse
0.51
-0.45
0.50
---
Very Inverse
0.51
1.75
0.50
---
1
The A, B, and N coefficients are for the standard relay formula
T = time to trip, in seconds
v = measured input voltage
v
v = measured input voltage
v
p
= pickup value (tap setting)
= multiple of pickup setting
D = time dial setting, 0.1 to 9.9 in steps of 0.1
A, B, N
A, B, N
= constants for inverse curves
For1.01
v
v
p
-----
1.5: T
AD
v
vp
-----
N
1
–
------------------------- BD
+
=
≤
≤
For
v
v
p
-----
1.5: T
AD
1.5
)
(
N
1
–
-------------------------- BD
+
=
>
v
vp
------
T = time to trip, in seconds
v = measured input voltage
v
v = measured input voltage
v
p
= pickup value (tap setting)
= multiple of pickup setting
D = time dial setting, 0.1 to 9.9 in steps of 0.1
A, B, N
A, B, N
= constants for inverse curves
For 0.5
v
v
p
-----
1.5: T
AD
v
vp
-----
N
1
–
------------------------- BD
+
=
≤
≤
For
v
v
p
-----
0.5:
T
AD
1.5
)
(
N
1
–
-------------------------- BD
+
=
≤
v
vp
------
Figure A.11 Moderately Inverse Overvoltage Curve
Figure A.12 Moderately Inverse Undervoltage Curve
Multiples of Pickup
T
ime to T
rip (Seconds)
T
ime Dial
1000
100
10
1
0.1
9.9
5.0
2.0
1.0
0.5
0.2
0.1
1
1.1
1.2
1.3
1.4
1.5
1.6
Multiples of Pickup
T
ime to T
rip (Seconds)
T
ime Dial
1000
100
10
1
0.1
9.9
5.0
2.0
1.0
0.5
0.2
0.1
0.4
0.5
0.6
0.7
0.8
0.9
1.0
A
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