Function Range or value Accuracy
Dynamic overreach <5% at 85 degrees
measured with
CVT’s and
0.5<SIR<30
-
Definite time delay phase-
phase and phase-ground
operation
(0.000-60.000) s ±0.2% or ±40 ms whichever is greater
Trip time 25 ms typically IEC 60255-121
Reset ratio 105% typically -
Reset time at 0.1 x Zreach to 2
x Zreach
Min. = 20 ms
Max. =50 ms
-
7.7 Phase selection, quadrilateral characteristic with
settable angle FRPSPDIS (21)
GUID-29E9C424-5AF7-40EE-89D9-F6BB4F0A0836 v2
7.7.1 Identification
GUID-07DB9506-656C-4E5F-A043-3DAA624313C7 v2
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Phase selection, quadrilateral
characteristic with settable angle
FRPSPDIS
SYMBOL-DD V1 EN-US
21
7.7.2 Functionality
GUID-A15350C8-CFA9-4BD9-9DE1-5D5814290F61 v3
The ability to accurately and reliably classify the different types of fault, so that single pole
tripping and autoreclosing can be used plays an important role in today's power systems. Phase
selection, quadrilateral characteristic with settable angle FRPSPDIS (21) is designed to accurately
select the proper fault loop in the distance function dependent on the fault type.
The heavy load transfer that is common in many transmission networks may make fault resistance
coverage difficult to achieve. Therefore, FRPSPDIS (21) has a built-in algorithm for load
encroachment, which gives the possibility to enlarge the resistive setting of both the phase
selection and the measuring zones without interfering with the load.
The extensive output signals from the phase selection gives also important information about
faulty phase(s) which can be used for fault analysis.
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.
Section 7 1MRK 502 066-UUS B
Impedance protection
272
Technical manual
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