ABB Relion 670 series - Page 545

Table 38: Inverse time characteristics
Curve name
ANSI Extremely Inverse
ANSI Very Inverse
ANSI Normal Inverse
ANSI Moderately Inverse
ANSI/IEEE Definite time
ANSI Long Time Extremely Inverse
ANSI Long Time Very Inverse
ANSI Long Time Inverse
IEC Normal Inverse
IEC Very Inverse
IEC Inverse
IEC Extremely Inverse
IEC Short Time Inverse
IEC Long Time Inverse
IEC Definite Time
User Programmable
ASEA RI
RXIDG (logarithmic)
See chapter “Inverse time characteristics” in Technical Manual for the description of
different characteristics
tPCrv, tACrv, tBCrv, tCCrv: Parameters for customer creation of inverse time
characteristic curve (Curve type = 17). The time characteristic equation is:
[ ]
_
= + ×
-
æ ö
ç ÷
ç ÷
ç ÷
æ ö
ç ÷
ç ÷
è ø
è ø
p
A
t s B InMult
i
C
Pickup N
EQUATION2031-ANSI V1 EN
(Equation 482)
tINNonDir is the definite time delay for the non directional ground fault current
protection, given in s.
OpVN is set Enabled to activate the trip function of the residual over voltage protection.
1MRK 506 369-UUS - Section 9
Current protection
Line distance protection REL670 2.2 ANSI 539
Application manual