Table 73. 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
unless otherwise stated
Class 5 +40 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
unless otherwise stated
Breaker protection REQ650 ANSI
1MRK 505 269-BUS -
Product version: 1.1
Issued: April 2011
ABB
83