GUID-19F8E187-4ED0-48C3-92F6-0D9EAA2B39BB v3
Table 677:
ANSI Inverse time characteristics for Sensitive directional residual overcurrent and
power protection
Function
Range or value
Accuracy
Operating characteristic:
(
)
1
P
A
t
B k tDef
I
æ
ö
ç
÷
=
+
× +
ç
÷
ç
-
÷
è
ø
EQUATION1249-SMALL V2 EN-US
Reset characteristic:
( )
2
1
=
×
-
tr
t
k
I
EQUATION1250-SMALL V1 EN-US
I = I
measured
/I
set
0.10 ≤ k ≤ 2.00
1.5 x I
set
≤ I ≤ 20 x I
set
ANSI/IEEE C37.112 ,
±5.0% or ±160 ms
whichever is greater
ANSI Extremely Inverse
A=28.2, B=0.1217, P=2.0 ,
tr=29.1
ANSI Very inverse
A=19.61, B=0.491, P=2.0 ,
tr=21.6
ANSI Normal Inverse
A=0.0086, B=0.0185, P=0.02,
tr=0.46
ANSI Moderately Inverse
A=0.0515, B=0.1140, P=0.02,
tr=4.85
ANSI Long Time Extremely Inverse
A=64.07, B=0.250, P=2.0,
tr=30
ANSI Long Time Very Inverse
A=28.55, B=0.712, P=2.0,
tr=13.46
ANSI Long Time Inverse
A=0.086, B=0.185, P=0.02,
tr=4.6
1MRK 506 382-UEN A
Section 23
Inverse time characteristics
Line distance protection REL650 2.2 IEC
899
Technical manual
Summary of Contents for RELION 650 SERIES
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