ABB RET670 - Page 468

Table 99: 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)
The different characteristics are described in Technical Manual.
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 367)
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 voltage protection.
tVN is the definite time delay for the trip function of the residual voltage protection,
given in s.
Section 3 1MRK504116-UUS C
IED application
462
Application manual