![ABB RELION Series Technical Manual Download Page 367](http://html1.mh-extra.com/html/abb/relion-series/relion-series_technical-manual_3663191367.webp)
The function contains a blocking functionality. It is possible to block function outputs,
timers or the function itself, if desired.
4.2.6.4
Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "On" and "Off".
For WPWDE, certain notations and definitions are used.
Residual voltage Uo = (UA+UB+UC)/3 = U
0
, where U
0
= zero-
sequence voltage
Residual current Io = -(IA+IB+IC) = 3×- I
0
, where I
0
= zero-sequence
current
The minus sign (-) is needed to match the polarity of calculated and
measured residual currents.
The operation of WPWDE can be described with a module diagram. All the modules
in the diagram are explained in the next sections.
Directional
calculation
Level
detector
Io
Residual
power
calculation
Uo
BLOCK
OPERATE
START
RCA_CTL
t
Timer
t
Blocking
logic
GUID-2E3B73F0-DB0D-4E84-839F-8E12D6528EEC V1 EN
Figure 188:
Function module diagram
Directional calculation
The Directional calculation module monitors the angle between the operating quantity
(residual current Io) and polarizing quantity (residual voltage Uo). The operating
quantity can be selected with the setting
Io signal Sel
. The selectable options are
“Measured Io” and “Calculated Io”. The polarizing quantity can be selected with the
setting
Pol signal Sel
. The selectable options are “Measured Uo” and “Calculated
Uo”. When the angle between operating quantity and polarizing quantity after
considering the
Characteristic angle
setting is in the operation sector, the module
sends an enabling signal to Level detector. The directional operation is selected with
the
Directional mode
setting. Either the “Forward” or “Reverse” operation mode can
be selected. The direction of fault is calculated based on the phase angle difference
between the operating quantity Io and polarizing quantity Uo, and the value (ANGLE)
is available in the monitored data view.
1MRS758755 A
Section 4
Protection functions
REC615 and RER615
361
Technical Manual
Summary of Contents for RELION Series
Page 1: ... RELION PRODUCT FAMILY Grid Automation REC615 and RER615 Technical Manual ...
Page 2: ......
Page 30: ...24 ...
Page 50: ...44 ...
Page 189: ...3 18 5 Settings 1MRS758755 A Section 3 Basic functions REC615 and RER615 183 Technical Manual ...
Page 206: ...200 ...
Page 514: ...508 ...
Page 714: ...708 ...
Page 786: ...780 ...
Page 796: ...790 ...
Page 798: ...792 ...
Page 803: ...797 ...