Toshiba GR-200 Series Instruction Manual page 62
Multi functional protection ied
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Also See for GR-200 Series:
- Instruction manual (1770 pages) ,
- Instruction manual (996 pages) ,
- Instruction manual (1176 pages)
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where
3Io = residual current
3Vo = residual voltage
−3Vo = reference voltage (or polarizing voltage)
φ= lagging angle
θ = EF setting angle
I
= Setting value of the EF element ([EF1-DT] and the others)
EF
EF_Vpol = Setting value of the polarizing voltage ([EF1-Vpol])
Note: In the case of an internal fault, the phase angle is equal to the angle of the zero-
sequence impedance of the system, in a directly-earthed system this value is in
the range of approximately 50° to 90°. The sensing angle θ of the EF element can
be set between -90° to 90°. The minimum voltage necessary to maintain
directionality can be set from 0.5 to 100.0 V.
Reverse
Operation zone
Directional characteristic
θ= 0°
angle line
Forward
Operation zone
θ= 0°
Figure 2.2-2 Examples of directional characteristic angle (θ)
Characteristic of directional EF in the reverse direction
(iii)
The reverse characteristic is a mirror image of the forward characteristic. The setting and the
scheme switch, in addition to providing the setting of the directional EF element in the forward
direction, provides the setting of the directional EF element in the reverse direction: for
example, Reverse is set for the scheme switch [EF1-Dir] when the direction of the EF element
for stage 1 is considered.
3��
≥ ��
0
����
3��
× cos(φ − |θ|) ≥ 0
0
3��
≥ ����_��������
0
Forward
Operation zone
Vpol
θ= +60°
Forward
Operation zone
θ= -60°
- 43 -
Forward
Directional characteristic
Operation zone
angle line
θ= +60°
Vpol
Reverse
Operation zone
Reverse
Operation zone
Vpol
θ= -60°
Directional characteristic
Forward
angle line
Operation zone
6F2T0200 (0.15)
(2.2-1)
(2.2-2)
(2.2-3)
Directional characteristic
angle line
θ= +90°
Vpol
Reverse
Operation zone
θ= +90°
Reverse
Operation zone
Vpol
θ= -90°
Directional characteristic
angle line
θ= -90°
GRE200 (1,2)
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