ABB Relion 650 Series Technical Manual page 114

Section 5
Impedance protection
5.3.6.3 Basic operation characteristics
Each zone can also be set to
x is 1-5 depending on selected zone).
(where
Each impedance zone can be disabled, or set to operate for phase-to-ground or phase-to-phase
fault by setting
The offset mho characteristic can be set in
parameter
selected a directional line is introduced. Information about the directional line is given from the
directional element (ZDNRDIR) and given to the measuring element as binary coded signal to the
input DIRCND.
The zone reach for phase-to-ground fault and phase-to-phase fault is set individually in polar
coordinates.
The impedance is set by the parameter
Compensation for ground return path for faults involving ground is done by setting the parameter
KNMagx and KNAngx .
KNMag =
EQUATION1579 V1 EN-US
KNAng
EQUATION1807-ANSI V1 EN-US
where
Z0
Z1
The phase-to-ground and phase-to-phase measuring loops can be time delayed individually by
setting the parameter
depending on selected zone) respectively. To release the time delay, the operation mode for the
OpModeLGx (where x is 1-5 depending on selected zone) and OpModetPPx (where x is 1-5
timers,
depending on selected zone), has to be set to
operation.
The function can be blocked in the following ways:
• activating of input BLOCK blocks the whole function
• activating of the input BLKZ (fuse failure) blocks all output signals
• activating of the input BLOCK_OP blocks all output signals
• activating the input BLKPG blocks the phase-to-ground fault loop outputs
• activating the input BLKPP blocks the phase-to-phase fault loop outputs
108
Offset , Forward or Reverse by setting the parameter DirModeSelx
OpModex (where x is 1-5 depending on selected zone).
OffsetMhoDirx (where x is 1-5 depending on selected zone). When Forward or Reverse is
Z0-Z1
×
3 Z1
( )
-
Z 0 Z 1
=
ang
×
3 Z 1
is the complex zero sequence impedance of the line in Ω/phase
is the complex positive sequence impedance of the line in Ω/phase
tLGx (where x is 1-5 depending on selected zone) and tPPx (where x is 1-5
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Non-directional , Forward or Reverse by the setting
Z and the corresponding angles by the parameter LineAng .
Enabled . This is also the case for instantaneous
1MRK 506 326-UUS B
SEMOD154224-21 v4
(Equation 11)
(Equation 12)
Line distance protection REL650
Technical manual