ABB Relion 670 Series Applications Manual page 169

1MRK 511 358-UUS A
OpINNonDir is set Enabled to activate the non-directional residual current protection.
INNonDirPU is the operate current level for the non-directional function. The setting is given in %
IBase . This function can be used for detection and clearance of cross-country faults in a shorter
of
time than for the directional function. The current setting should be larger than the maximum
single-phase residual current on the protected line.
TimeChar is the selection of time delay characteristic for the non-directional residual current
protection. Definite time delay and different types of inverse time characteristics are available:
Table 19:
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:
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t s
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EQUATION2031-ANSI V1 EN-US
Application manual
Inverse time characteristics
A
+
B
p
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i
-
C
ç ÷
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Pickup N _
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÷
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×
InMult
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Section 7
Current protection
(Equation 60)
163