Hitachi Relion 670 Series Applications Manual page 95

1MRK506375-UEN Rev. N
When Mode is set to UILvl&Imp, the condition for tripping is an ORed between UILevel and
Impedance.
tDuration: The setting of the timer for the release of UILevel is, by default, 0.02 seconds, which has
proven to be suitable in most cases from field experience. If a shorter time delay is to be set, it is
necessary to consider the voltage recovery time during line energization.
7.2 Distance protection, quadrilateral characteristic
ZRWPDIS
7.2.1 Function revision history
Document
revision
A
B
C
D
E
F
G
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M
N
7.2.2 Identification
Function description
Distance protection, quadrilateral
characteristic
7.2.3 Application
The distance protection, quadrilateral characteristic ZRWPDIS function is applicable for all earthing
types in 2-phase power networks. The SystemEarthing setting is provided in order to have the
distance protection function suitable for a specific type of earthing system.
Railway application RER670
Application manual
Product History
revision
2.2.1 Scale factor for setting parameter tVL2 is modified to 1000.
2.2.1 -
2.2.2 Default service value for outputs ZL1Ang, ZL2Ang, and ZL12Ang are displayed as
9999.999 in the monitoring tool when the measured current is below minimum current set
level. Setting parameters REOverRLStart and XEOverXLStart are not visible in PST when
system earthing is chosen as Compensated or High impedance.
2.2.3 Internal time delay of one fundamental power cycle for seal-in detection logic is added for
stable direction detection and trip indication even with low voltage conditions during fault.
Operating time improvement for faults occurrence around 90.0% to 95% of set reach for
all measuring zones. No maloperation from instantaneous measuring zones at CB
opening.
2.2.3 -
2.2.4 -
2.2.4 Added outputs TRUDISP, TRPHPRL2, and STIE after I0 expired signal combined into
STCND. Updated current reversal logic to avoid unintentional additional time delay of 1.5
fundamental power cycles for faults, without current reversal conditions. Updated end
zone timer logic to avoid false trip indications even when OpModeEndI0 is set to Off.
2.2.5 -
2.2.6 -
2.2.6 -
IEC 61850
identification
ZRWPDIS
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Section 7
Impedance protection
89