Hitachi Relion 670 Series Applications Manual page 147

1MRK506375-UEN Rev. N
RFFwZ3: To set the zone 3 forward fault resistive reach in ohm/p if quadrilateral characteristic is
chosen. It should be set to give maximum coverage of the fault resistance and load encroachment.
RFRevZ3: To set the zone 3 reverse fault resistive reach in ohm/p if quadrilateral characteristic is
chosen. It may be set identical to RFFwZ3.
tZ3: To set the zone 3 time delay to trip. Time delay is used to coordinate with the slowest circuit
backup protection or slowest local backup for faults within zone 3 reach. The default setting is 1.5s.
7.4.5 Catenary Protection
The ZGTPDIS function can also be utilized for catenary line protection. By using it a simple, three-
zone underimpedance protection with independent reach in forward and reverse direction can be
easily achieved. Consider the following:
• ZGTPDIS function is using full cycle DFT filtering. Thus, all higher harmonics are effectively
suppressed in measured current and voltage signals.
• The start time of the individual underimpedance zones is typically slightly bigger than one
fundamental power system cycle.
• If directional operation is required (e.g. operation for faults in forward direction only), the
operation of the individual underimpedance zones can be supervised by forward start of the
directional overcurrent function D2PTOC. Several instances of this function are readily available
in the IED.
• Second harmonic blocking feature may be required for catenary protection. For this purpose,
second harmonic blocking feature available in D2PTOC function can be utilized.
• Sometimes supervision by sudden change in current and/or voltage signals is required for
catenary protection. For this purpose, individual zones can be supervised by outputs STDI and
STDU from the FRWSPVC function. Several instances of FRWSPVC function are readily
available in the IED.
• To achieve any of the above mentioned supervisions, corresponding configuration logic and
appropriate setting in the PCM600 tool shall be done.
• For external supervision from any additional logic input BLKZx on the ZGTPDIS function shall be
used in the IED configuration.
7.4.6 Wrong phase coupling protection
The ZGTPDIS function in combination with directional overcurrent function D2PTOC and associated
configuration logic can be utilized for wrong phase coupling protection. The operating characteristic
as shown in Figure
logic and appropriate setting in the PCM600 tool shall be done.
Railway application RER670
Application manual
52 can be easily achieved. To achieve such application, a simple configuration
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Section 7
Impedance protection
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