Hitachi Relion 670 Series Applications Manual page 145

1MRK511407-UUS Rev. N
INNonDirPU is the pickup current level for the non-directional function. The setting is given in % of IBase.
This function can be used for detection and clearance of cross-country faults in a shorter 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 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:
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EQUATION2031-ANSI V1 EN-US
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.
tVN is the definite time delay for the trip function of the residual voltage protection, given in s.
Phasor measurement unit RES670
Application manual
Inverse time characteristics
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B
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Pickup N _
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InMult
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Section 8
Current protection
(Equation 57)
139