Toshiba GR200 Series Instruction Manual page 1057

Line differential protection ied

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Settings for residual voltage, CT polarity, and busbar arrangements

In the IED, the residual voltage represented 'Ve' is given by the computation with three-phase

voltages (V a , V b , and V c ), but the VCT is ready to obtain it exclusively using APPL-VCT

settings when the residual voltage transformer is connected with the VCT. Additionally, the

VCT has the settings for changing the CT polarity so that the user can reverse the polarity

without wiring works. In the 1.5CB arrangement, the IED is required to obtain double three-

phase currents measured at separate current-transforms so that the VCT has a setting for

selecting the current transformers.

Setting [APPL-Ves2] = Ve

Set Ve for the setting [APPL-VTes2], when the residual voltage transform is provided. Figure

5.2-9 illustrates the signals from the VTs on the feeder are injected for the 'Ve' terminal on the

Setting [APPL-Ves2]=Ve

Setting [APPL-Ves2] = Vs2

Figure 5.2-10 illustrates the residual voltage transform is not provided; set Vs2 for the setting

[APPL-VTes2]. Note that the IED computes the voltage in zero-sequence mathematically (3V0)

using the three-phase voltages.

Polarity Change

Figure 5.2-8 APPL-VCT setting screen

VT on busbar

VTs on feeder

Figure 5.2-9 Connection with residual VT

VCHK function

Three-phase voltages

Reference voltage

Residual voltage

6F2S1914 (0.49)

GRL200 (Soft 033 & 037)

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