Table 96: FDPSPDIS (21) Group settings (advanced)
Name Values (Range) Unit Step Default Description
21 enable Disabled
Enabled
- - Enabled Operation of impedance based
measurement
50/51 enable Disabled
Enabled
- - Disabled Operation of current based measurement
Pickup Iph 10 - 2500 %IB 1 120 Pickup value for phase over-current
element
Pickup_N 10 - 2500 %IB 1 20 Pickup value for trip from 3I0 over-current
element
TimerPP Disabled
Enabled
- - Disabled Operation mode Disable/Enable of Zone
timer, Ph-Ph
tPP 0.000 - 60.000 s 0.001 3.000 Time delay to trip, Ph-Ph
TimerPE Disabled
Enabled
- - Disabled Operation mode Disable/ Enable of Zone
timer, Ph-G
tPG 0.000 - 60.000 s 0.001 3.000 Time delay to trip, Ph-E
Table 97: FDPSPDIS (21) Non group settings (basic)
Name Values (Range) Unit Step Default Description
GlobalBaseSel 1 - 12 - 1 1 Selection of one of the Global Base Value
groups
7.2.6 Operation principle
M13140-3 v6
Phase selection with load encroachment, quadrilateral characteristic FDPSPDIS (21) includes six
impedance measuring loops; three intended for phase-to-ground faults, and three intended for
phase-to-phase faults as well as for three-phase faults.
The difference, compared to the distance zone measuring function, is in the combination of the
measuring quantities (currents and voltages) for different types of faults.
A current-based phase selection is also included. The measuring elements continuously measure
three phase currents and the residual current, and compare them with the set values. The current
signals are filtered by Fourier's recursive filter, and separate trip counter prevents too high
overreaching of the measuring elements.
The characteristic is basically non-directional, but FDPSPDIS (21) uses information from the
directional function to discriminate whether the fault is in forward or reverse direction.
The pickup condition PHSELZ is essentially based on the following criteria:
1. Residual current criteria, that is, separation of faults with and without ground connection
2. Regular quadrilateral impedance characteristic or current based criteria
3. Load encroachment characteristics is always active but can be switched off by selecting a
high setting.
The current pickup condition DLECND is based on the following criteria:
Section 7 1MRK 502 066-UUS B
Impedance protection
200
Technical manual
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