phase-to-phase
tPP measuring loops in each distance protection zone separately, to further
increase the total flexibility of a distance protection.
7.10
Phase selection, quadrilateral characteristic with
settable angle FRPSPDIS
GUID-29E9C424-5AF7-40EE-89D9-F6BB4F0A0836 v2
7.10.1
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
Z<phs
SYMBOL-DD V1 EN-US
21
7.10.2
Application
GUID-D07A7B62-FDB9-4728-859A-9CE7423BE128 v1
The operation of transmission networks today is in many cases close to the stability limit. 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 this matter. Phase selection,
quadrilateral characteristic with settable angle (FRPSPDIS) is designed to accurately select the
proper fault loop in the distance measuring function depending on the fault type.
The heavy load transfer that is common in many transmission networks may in some cases be
in opposite to the wanted fault resistance coverage. Therefore, the function has a built in
algorithm for load encroachment, which gives the possibility to enlarge the resistive setting of
both the Phase selection with load encroachment and the measuring zones without interfering
with the load.
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 extensive output signals from FRPSPDIS give also important information about faulty
phase(s), which can be used for fault analysis.
Load encroachment
Each of the six measuring loops has its own load (encroachment) characteristic based on the
corresponding loop impedance. The load encroachment functionality is always active, but can
be switched off by selecting a high setting.
The outline of the characteristic is presented in figure
. As illustrated, the resistive blinders
are set individually in forward and reverse direction while the angle of the sector is the same in
all four quadrants.
1MRK 505 343-UEN B
Section 7
Impedance protection
285
Application manual
Summary of Contents for Relion 670 series
Page 1: ...RELION 670 SERIES Line differential protection RED670 Version 2 1 IEC Application manual...
Page 2: ......
Page 40: ...34...
Page 64: ...58...
Page 150: ...144...
Page 406: ...400...
Page 472: ...466...
Page 494: ...488...
Page 512: ...506...
Page 524: ...518...
Page 604: ...598...
Page 686: ...680...
Page 718: ...712...
Page 722: ...716...
Page 758: ...752...
Page 759: ...753...