ABB REC650 ANSI - Page 670

Table 577: Inverse time characteristics for undervoltage protection
Function Range or value Accuracy
Type A curve:
=
-
æ ö
ç ÷
è ø
td
t
VPickup V
VPickup
EQUATION1658 V1 EN
V = V
measured
td = (0.05-1.10) in steps of
0.01
±5% +60 ms
Type B curve:
×
= +
-
× -
æ ö
ç ÷
è ø
2.0
480
0.055
32 0.5
td
t
VPickup V
VPickup
EQUATION1659 V1 EN
V = V
measured
td = (0.05-1.10) in steps of
0.01
Table 578: 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
V = V
measured
td = (0.05-1.10) in steps of
0.01
±5% +70 ms
Type B curve:
=
×
-
× - -
æ ö
ç ÷
è ø
2.0
480
32 0.5 0.035
t
td
V VPickup
VPickup
EQUATION1662 V1 EN
td = (0.05-1.10) in steps of
0.01
Type C curve:
=
×
-
× - -
æ ö
ç ÷
è ø
3.0
480
32 0.5 0.035
t
td
V VPickup
VPickup
EQUATION1663 V1 EN
td = (0.05-1.10) in steps of
0.01
Section 19 1MRK 511 287-UUS A
Time inverse characteristics
664
Technical manual