Curve name
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
in
EQUATION1958 V1 EN (Equation 209)
tINNonDir is the definite time delay for the non directional earth fault current
protection, given in s.
OpUN> is set On to activate the trip function of the residual over voltage protection.
tUN is the definite time delay for the trip function of the residual voltage protection,
given in s.
9.7 Thermal overload protection, two time constants
TRPTTR
Section 9 1MRK 502 071-UEN -
Current protection
366 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
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