ABB Relion 670 series, Technical Manual

Page: 1401 / 1432

Table
1086: Inverse time characteristics for residual overvoltage protection
Function Range or value Accuracy
Type A curve:
=
-
æ ö
ç ÷
è ø
t
td
V VPickup
VPickup
EQUATION1661 V1 EN-US
V = V
measured
td = (0.05-1.10) in steps
of 0.01
±5.0% or ±45 ms whichever is greater
Type B curve:
32 0.5
=
⋅
−
⋅ −
 
 
 
2.0
480
+ 0.035
t
td
V VPickup
VPickup
EQUATION1662 V2 EN-US
td = (0.05-1.10) in steps
of 0.01
Type C curve:
=
⋅
−
 
 
 
3.0
480
32 0.5
+ 0.035
t
td
V VPickup
VPickup
⋅ −
EQUATION1663 V2 EN-US
td = (0.05-1.10) in steps
of 0.01
Programmable curve:
×
= +
-
× -
æ ö
ç ÷
è ø
P
td A
t D
V VPickup
B C
VPickup
EQUATION1664 V1 EN-US
td = (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
1MRK 502 066-UUS B Section 26
Inverse time characteristics
1395
Technical manual