Toshiba GR-200 Series Instruction Manual page 323
Multi functional protection ied
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Also See for GR-200 Series:
- Instruction manual (1770 pages) ,
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- Instruction manual (1176 pages)
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together with a brief description of each method and the settings necessary for an earth fault.
Table 2.26-3 Method and setting of earth fault compensation
Compensation
method
Residual-current
Source-impedance
†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.
Scheme logic
2.26.4
Figure 2.26-4 shows the trigger signals for FL data recording and computation. The elements
of the overcurrent protection function, (OC) output signals when their respective elements
operate. As it is necessary to match the direction of both the FL calculation and the elements
of the protection functions, the user must set the direction of the protection elements and the
direction of the FL computation to be the same.
The trigger signals are provided by the following functions: (a) Over current protection
function and (b) External protection function. With regard to the signals from external
protection function, the user is allowed to program triggers for data-saving and calculation
using Data IDs. The following Data IDs (i.e. PLC connection points) are provided in order that
the trigger is able to initiate the start of the FL calculation.
Data ID "FL_RecF" and "FL_RecR":
Data ID "FL_LocF" and "FL_LocR":
Required setting objects
Switch
Impedance
[FL-Z0B]
setting
[FL_R0m]
and
Off
[FL_X0m]
[FL_Z0B_L],
[FL_Z0B_R],
[FL_R0m],
On
and
[FL_X0m]
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Description of the compensation
method
When the residual current is
available from the adjacent line, the
compensation method "Residual-
current" is applicable.
If the residual current is not
available, the compensation method
"Source-impedance" should be
selected.
Trigger for data save
Trigger for of calculation
6F2T0200 (0.15)
Required power
system quantities
for respective
operation
I0m, Ia, Ib, Ic,
Va, Vb, Vc
Ia, Ib, Ic, Va, Vb,
Vc
GRE200 (1,2)
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