Toshiba GR200 Series - (i)-6 Charging current compensation

6F2S1914 (0.49)
GRL200 (Soft 033 & 037)
- 109 -
Table 2.10-2 Zone element, characteristics and directional
Zone
Element
Purpose
Directional
Characteristic
Set the ‘ Knee’
Forward
Reverse
Non-directional
Quadrilateral
MHO
Set Z
Set X
1
Z1S
/Z1G
Protection for Zone 1 (Relay
reach ≤ 80 % )
Yes
Yes
Yes
Yes
Yes
Yes
Yes
1X
Z1XS
Z1XG
Protection for Zone 1 extension
(Relay reach ≤ 100 %)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
2
Z2S
/Z2G
/
Back up for Z1S, Z1X
Yes
Yes
Yes
Yes
Yes
Yes
No
3
Z3S
/Z3G
Back up for Z1S, Z1X
Yes
Yes
Yes
Yes
Yes
Yes
No
4
Z4S
/Z4G
Back up for Z1S, Z1X
Yes
Yes
Yes
Yes
Yes
Yes
No
5
Z5S
/Z5G
Protection for over Zone 1
extension (Relay reach > 100 %)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Charging current compensation
When this distance protection function is applied to underground cables or long-distance
overhead lines, the effect of charging current is to be considered; it appears as a distance
measurement error to the fault. In order to suppress the effect and maintain the high-accuracy
distance-measurement capability, the charging current compensation function should be used.
Compensation is recommended if the minimum fault current is three times less than the
charging current.
The charging current compensation function has common scheme switches for both ZS
and ZG. The On setting is selected for the scheme switch [Z-IcC.EN] along with a setting value
for the setting [Z-IcC].