1MAC050144-MB C
Section 4
Protection functions
615 series ANSI
287
Technical Manual
Figure 136:
Configurable directional setting when “Neg. seq. volt.” selection is made
using
Pol signal Sel
When “Measured V
G
” or “Calculated V
N
” voltage selection is made using
Pol signal Sel
setting, the Directional detector module compares the angle of the residual current to the
residual voltage. Using the residual voltage as reference the residual current angle is
compared to the
Characteristic angle
setting. If the angle difference is within the operating
sector selected by
Directional mode
setting, then enable signal is sent to the Timer.
The operating sector is defined by the settings
Max forward angle
,
Max reverse angle
,
Min
forward angle
, and
Min reverse angle
(see Figure 137). User selectable options for
Directional mode
are “Forward” and “Reverse”.
The
Characteristic angle
is also known as Relay Characteristic Angle
(RCA), Relay Base Angle or Maximum Torque Line.
The “Measured IG” or “Calculated IN” (residual current) can be selected
using
Io signal Sel
setting.
The “Measured VG”, “Calculated VN” (residual voltage) can be selected
using
Pol signal Sel
setting.
The polarizing quantity (residual voltage) is inverted because of switched
voltage measurement cables, the correction can be done by setting the
Pol
reversal
setting to
“
True
”
which rotates polarizing quantity by 180
degrees.
-V
2
I
2
RCA=+45 deg
Max
forward
angle
Min
forward
angle
Max
reverse
angle
Min
reverse
angle
Backward
area
Forward
area
No
n-
ope
ra
tin
g
ar
ea
N
on
-o
pe
ra
tin
g
ar
ea
Min operate
voltage
Min operate
current
Characteristic
Angle/
Max torque line
Zero torque line
Содержание 615 Series ANSI
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Страница 389: ...Section 4 1MAC050144 MB C Protection functions 382 615 series ANSI Technical Manual ...
Страница 485: ...Section 6 1MAC050144 MB C Supervision functions 478 615 series ANSI Technical Manual ...
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Страница 707: ...Section 15 1MAC050144 MB C Applicable standards and regulations 700 615 series ANSI Technical Manual ...
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