sensitivity by reducing the minimum operating current down to 10% of the IED base current.
This happens especially in cases, when the IED serves as a remote back-up protection on series
of very long transmission lines.
If the load current compensation is activated, there is an additional criteria
IMinOpIN that will
block the phase-earth loop if the 3I0<
IMinOpIN. The default setting of IMinOpIN is 5% of the
IED base current
IBase.
The minimum operating fault current is automatically reduced to 75% of its set value, if the
distance protection zone has been set for the operation in reverse direction.
7.5.3.10
Setting of timers for distance protection zones
SEMOD154704-138 v1
The required time delays for different distance-protection zones are independent of each
other. Distance protection zone1 can also have a time delay, if so required for selectivity
reasons. One can set the time delays for all zones (basic and optional) in a range of 0 to 60
seconds. The tripping function of each particular zone can be inhibited by setting the
corresponding
Operation parameter to Off. Different time delays are possible for the ph-E
(
tPE) measuring loops in each distance protection zone separately, to further increase the
total flexibility of a distance protection.
7.6
Additional distance protection directional function for
earth faults ZDARDIR
SEMOD175630-1 v3
7.6.1
Identification
GUID-39299546-12A2-4D9D-86D0-A33F423944E4 v2
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Additional distance protection
directional function for earth faults
ZDARDIR
S00346 V1 EN-US
-
7.6.2
Application
SEMOD154885-5 v9
The phase-to-earth impedance elements can be supervised by a phase unselective directional
function based on symmetrical components (option).
7.6.3
Setting guidelines
SEMOD154897-5 v6
AngleRCA and AngleOp: these settings define the operation characteristic. Setting AngleRCA is
used to turn the directional characteristic, if the expected fault current angle does not
coincide with the polarizing quantity to produce the maximum torque. The angle is positive, if
operating quantity lags the polarizing quantity and negative if it leads the polarizing quantity.
The setting
AngleOp (max. 180 degrees) defines the wideness of the operating sector. The
sector is mirror-symmetric along the MTA (Maximum Torque Axis).
Directional elements for earth-faults must operate at fault current values below the magnitude
of load currents. As phase quantities are adversely affected by load, the use of sequence
quantities are preferred as polarizing quantities for the earth directional elements. Optionally
six modes are available:
Section 7
1MRK 505 343-UEN B
Impedance protection
260
Application manual
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