Hitachi Relion 670 Series Applications Manual page 108

Section 7
Impedance protection
Common base IED values for primary current (IBase), primary voltage (UBase) and primary power
(SBase) are set in a global base values for settings function GBASVAL.
General settings
GlobalBaseSel: Selects the global base value group used by the function to define (IBase), (UBase)
and (SBase).
Operation: Sets the protection to On or Off.
System Earthing: To select the type of system earthing (i.e. Compensated, Solidly and High
impedance).
LineAng:To set the distance protection characteristic angle. It should be set to line angle of the
protected transmission line. The default value is 75 deg.
IMinOpPE: To select the minimum operating current for the phase-to-earth loops. If the minimum
current is exceeded, the distance protection calculates the impedance. The default setting is 10% IB.
IMinOpPP: To select the minimum operating current for the phase-to-phase loops. If the minimum
current is exceeded, the distance protection calculates the impedance. The default setting is 10% IB.
OpLoadEnch: To select the load discrimination characteristic operation to On or Off. The default
value is Off.
RLd: To set the resistive reach within the load impedance of load discrimination characteristic. This
setting can be calculated according to equation:
RLd 
IECEQUATION15051 V1 EN-US
Where,
RLd is the resistive reach within the load impedance area measured in Ohm/Phase
P is the maximum exporting power
max
U is the minimum phase-to-phase voltage for which P
min
0.8 is security factor.
ArgLd: To set the load angle determining the load impedance area of the load discrimination
characteristic. Set the parameter to the maximum possible load angle at maximum possible load.
The default value is set at 30 deg.
OpModeI0: To select the operation On or Off of the end zone timer logic using residual overcurrent
start to provide a remote backup.
OpModetEnd1: To select operation On or Off of the end timer 1.
OpDirEnd1: To select the direction mode of end timer 1. It can be set to Non-directional, Forward and
Reverse. It is recommended to set as Forward.
tEnd1: To set time delay for the first stage remote backup (end timer 1). The setting should allow the
farthest zone to operate. The default setting is 2.5 s.
OpModetEnd2: To select the operation On or Off of the end timer 2.
OpDirEnd2: To select the direction mode of the end timer 2. It can be set to Non-directional, Forward
and Reverse. It is recommended to set this as Non-directional.
102
2
U
min
0 8 .
P
max
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GUID-30CF921D-34EE-4F24-B050-C92036619F59 v4
can occur
max
Railway application RER670
1MRK506375-UEN Rev. N
(Equation 16)
Application manual