Toshiba GR-200 Series Instruction Manual page 139

Characteristic and setting
2.8.2
The hatched area of Figure 2.8-2 illustrates the BCD characteristic; the BCD function will
operate when the positive sequence current (I1) is larger than 0.04×In, the negative sequence
current (I2) is larger than 0.01×In, and the ratio |I
I
2
0.01×In
o
0.04×In
Miscellaneous functions
2.8.3
Harmonic detection function
(i)
The operation of BCD can be blocked when the IED detects 2
phenomenon of magnetizing inrush current when a transformer is energized. To block the
operation of the BCD function during the occurrence of the harmonic, set scheme switch [BCD-
2fBlk] Block.
Block operation of CTF for BCD
(ii)
The operation of the BCD function can be blocked by the current transformer failure (CTF)
function using a scheme switch. Block is set for scheme switch [BCD-CTFBlk] if the user wishes
to disable the operation of the BCD function when a current transformer failure occurs.
| �� |
2
| �� | ≥ 0.04 × ����
1
| �� | ≥ 0.01 × ����
2
Figure 2.8-2 Characteristic of BCD
- 120 -
/I | is higher than setting [BCD].
2 1
൘ ≥ ������⁡��������������
| �� |
1
I
1
nd
6F2T0200 (0.15)
BCD
&
harmonic caused by the
GRE200 (1,2)