Hitachi Relion 670 Series Applications Manual page 142

Section 7
Impedance protection
IEC18000067 V2 EN-US
Figure 49:
Using additional possibilities
The IED is a multifunctional device. This enables the use of configuration tool ACT in order to
achieve special requirements which are required for catenary distance protection. Following are
some typical examples:
• Higher zones (e.g. Z2 and/or Z3) can be enabled by dU/dt or dI/dt criteria. That can be arranged
inside of IED by using appropriate configuration.
• In AT installations, second harmonic blocking may be required for higher zones in order to
restrain the catenary during energizing of the feeder or auto-reclosing attempt. That can be
arranged inside of IED by using D2PTOC function to calculate second harmonic blocking
condition and appropriate configuration. Care shall be taken at which level the second harmonic
block shall be set. Typical value is approximately 40%.
• Cooperation with auto-reclosing function is very flexible. By using configuration tool ACT, it can
easily be controlled which zones/functions shall start the auto-reclosing cycle and which one
shall inhibit it.
• All of the above blocking/enabling can be made settable using GATE function blocks. In such
cases, a special screen can be engineered on the local HMI in order to provide an overview of
which blocking is enabled and active.
136
jX (Ω)
RFRvZ5
WPC -TRIP
XFwZ5
XFwZ4
RFRvZ4
Wrong phase coupling characteristic from ZRCPDIS
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ArgNegRes
CharAng
R (Ω)
ArgDir
IEC18000067=IEC18000067=2
=en-us=Original.vsdx
1MRK506375-UEN Rev. N
GUID-FCD05280-E284-4E6F-99A0-51D09A9BEFB2 v2
Railway application RER670
Application manual