Hitachi Relion REL670 Product Manual page 149

Line distance protection REL670
Version 2.2
Table 211. ANSI Inverse time characteristics for Sensitive directional residual overcurrent and power protection
Function
Operating characteristic:
æ ö
A
ç ÷
= + ×
t B k
( )
ç ÷
-
P
I 1
è ø
EQUATION1249-SMALL V3 EN-US
Reset characteristic:
t r
= ×
t k
( )
2
-
I 1
EQUATION1250-SMALL V1 EN-US
I = I /I
measured set
ANSI Extremely Inverse
ANSI Very inverse
ANSI Normal Inverse
ANSI Moderately Inverse
Long Time Extremely Inverse
Long Time Very Inverse
Long Time Inverse
Hitachi Energy
GUID-19F8E187-4ED0-48C3-92F6-0D9EAA2B39BB v5
Range or value
0.05 ≤ k ≤ 2.00
1.5 x I ≤ I ≤ 20 x I
set set
A=28.2, B=0.1217, P=2.0 , tr=29.1
A=19.61, B=0.491, P=2.0 , tr=21.6
A=0.0086, B=0.0185, P=0.02, tr=0.46
A=0.0515, B=0.1140, P=0.02, tr=4.85
A=64.07, B=0.250, P=2.0, tr=30
A=28.55, B=0.712, P=2.0, tr=13.46
A=0.086, B=0.185, P=0.02, tr=4.6
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1MRK 506 372-BEN Q
Accuracy
ANSI/IEEE C37.112 ,
±5.0% or ±160 ms
whichever is greater
149