Table 969:
IEC Inverse time characteristics for Voltage restrained time overcurrent protection
Function
Range or value
Accuracy
Operating characteristic:
(
)
1
=
×
-
æ
ö
ç
÷
ç
÷
è
ø
P
A
t
k
I
EQUATION1251-SMALL V1 EN
I = I
measured
/I
set
0.10 ≤ k ≤ 3.00
IEC 60255-151, ±5.0%
or ±40 ms whichever is
greater
IEC Normal Inverse
A=0.14, P=0.02
IEC Very inverse
A=13.5, P=1.0
IEC Inverse
A=0.14, P=0.02
IEC Extremely inverse
A=80.0, P=2.0
IEC Short time inverse
A=0.05, P=0.04
IEC Long time inverse
A=120, P=1.0
Table 970:
Inverse time characteristics for overvoltage protection
Function
Range or value
Accuracy
Type A curve:
=
-
>
>
æ
ö
ç
÷
è
ø
t
k
U
U
U
EQUATION1436-SMALL V1 EN
U> = U
set
U = U
measured
k = (0.05-1.10) in
steps of 0.01
±5.0% or ±45 ms
whichever is greater
Type B curve:
2.0
480
32
0.5
=
⋅
−
>
⋅
−
0.035
+
>
t
k
U U
U
EQUATION1437-SMALL V2 EN
k = (0.05-1.10) in
steps of 0.01
Type C curve:
3.0
480
32
0.5
=
⋅
⋅
−
−
>
0.035
+
>
t
k
U U
U
EQUATION1438-SMALL V2 EN
k = (0.05-1.10) in
steps of 0.01
Programmable curve:
×
=
+
-
>
×
-
>
æ
ö
ç
÷
è
ø
P
k A
t
D
U
U
B
C
U
EQUATION1439-SMALL V1 EN
k = (0.05-1.10) in
steps of 0.01
A = (0.005-200.000)
in steps of 0.001
B = (0.50-100.00) in
steps of 0.01
C = (0.0-1.0) in steps
of 0.1
D = (0.000-60.000) in
steps of 0.001
P = (0.000-3.000) in
steps of 0.001
Section 25
1MRK502052-UEN B
Inverse time characteristics
1260
Technical manual
Summary of Contents for Relion REG670
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