Toshiba GR 200 Series, Instruction Manual

Page: 349 / 1563

6F2S1915 (0.46)
GRZ200 (Soft 031 & 032)
- 328 -
together with a brief description of each method and the settings necessary for an earth fault.
Table 2.23-4 Method and setting of earth fault compensation
Compensation
method
Required setting objects
Description of the compensation
method
Required power
system quantities
for respective
operation
Switch
[
FL-Z0B
]
Impedance
setting
Residual-current
Off
[
FL_R0m
]
and
[
FL_X0m
]
When the residual current is
available from the adjacent line, the
compensation method “Residual-
current” is applicable.
I0m, Ia, Ib, Ic,
Va, Vb, Vc
Source-impedance
On
[
FL_Z0B_L
],
[
FL_Z0B_R
],
[
FL_R0m
],
and
[
FL_X0m
]
If the residual current is not
available, the compensation method
“Source-impedance” should be
selected.
Ia, Ib, Ic, Va, Vb,
Vc
†Note: For a single line circuit, the local IED computes the residual current (3I0) using
the AC analog input currents internally, FL compensation is executed
automatically within the IED. Therefore, the user is not required to set the
scheme switch [
FL-Z0B
]
Off
.
(viii)
Trigger of data save and calculation in operation
The FL requires start signals for the computation. The signals are provided by the following
protection functions:
(a) Distance protection
(b) Over current protection
(c) Carrier protection (command protection)
(d) External protection
With regard to the signals of the external protection function, user is allowed to program the
trigger of data-saving and calculation with Data IDs. The following Data IDs (PLC connection
points) are provided as the trigger to start the FL calculation.
Data ID “FL_RecF” and “FL_RecR”: Trigger for data save
Data ID “FL_LocF” and “FL_LocR”: Trigger for of calculation
Note: Data IDs are listed in section 2.23.5.
Data recording
Figure 2.23-4 shows logic that consists of elements of protection function; and these elements
output a trigger signal to data recording. These elements are sorted into the FL are from the
function of distance protection (ZS/ZG and ZCS/ZCG) and overcurrent protection (OC). When
these elements are operated, operation signals are outputted. In the FL, the respective