Thermal Overload Protection, Two Time Constants Trpttr - ABB RELION 650 Series Applications Manual

1MRK 504 158-UEN A
Table 18:
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
ç
ç
[ ] =
t s
ç
ç
è
EQUATION1958 V1 EN-US
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.
7.6 Thermal overload protection, two time constants
TRPTTR
Application manual
Inverse time characteristics
ö
÷
A
÷
+ ×
B InMult
÷
p
æ ö
i
-
C
ç ÷ ÷
è > ø ø
in
Section 7
Current protection
(Equation 49)
IP14513-1 v4
119