ABB REL670 2.2 IEC, Applications Manual

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UPP< : The setting of the phase-to-phase voltage level (line voltage) which is used
by the evaluation logic to verify that a fault exists in two or more phases. The
voltage must be set to avoid that a partly healthy phase-to-phase voltage, for
example, L2-L3 for a L1-L2 fault, picks-up and gives an incorrect release of all
loops. The setting can typically be 40 to 50% of rated voltage (
UBase ) divided by
√3, that is 40%.
3U0> : The setting of the residual voltage level (neutral voltage) which is used by
the evaluation logic to verify that an earth-fault exists. The setting can typically be
20% of base voltage (
UBase ).
IN> : The setting of the residual current level (neutral current) which is used by the
evaluation logic to verify that a cross-country fault exists. The setting can typically
be 20% of base current (
IBase ) but the setting shall be above the maximum current
generated by the system earthing. Note that the systems are high impedance
earthed which means that the earth-fault currents at earth-faults are limited and the
occurring IN above this level shows that there exists a two-phase fault on this line
and a parallel line where the IN is the fault current level in the faulty phase. A high
sensitivity need not to be achieved as the two-phase fault level normally is well
above base current.
tIN : The time delay for detecting that the fault is cross-country. Normal time setting
is 0.1 - 0.15 s.
tUN : The time delay for a secure UN detecting that the fault is an earth-fault or
double earth-fault with residual voltage. Normal time setting is 0.1 - 0.15 s.
tOffUN : The UN voltage has a reset drop-off to ensure correct function without
timing problems. Normal time setting is 0.1 s
8.20 Phase preference logic PPL2PHIZ
GUID-80133640-FB3E-400C-B7FF-C2BB0AD1A045 v1
8.20.1 Identification
GUID-850E4134-E912-45EC-981E-E1A2C12A91A8 v1
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase preference logic PPL2PHIZ - -
8.20.2 Application
GUID-FFAB7FE9-8BB8-4EFD-A2B7-20FA759D47D6 v1
The Phase preference logic function PPL2PHIZ provides a supplementary phase
selection to the High speed distance protection ZMFPDIS. The application is for
resonance (Petersen coil) or high resistive earthed systems where phase preference
based tripping is required for so-called cross-country faults, two simultaneous
single phase-to-earth-faults in different phases and on different line sections.
1MRK 506 369-UEN B
Section 8
Impedance protection
Line distance protection REL670 2.2 IEC 449
Application manual