Toshiba GR200 Series Instruction Manual page 404

Line differential protection ied

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The three calculations are in sequence performed and a calculation result is selected from

(Calc. 1) Calculation for a fault being as far as the junction (a fault on line GJ)

(Calc. 2) Calculation for a fault being beyond the junction (a fault on line JH)

(Calc. 3) Calculation for a fault being beyond the junction (a fault on line JS)

Figure 2.32-2 IED G, H, and S on lines with a junction and a fault on line JS

The FL in IED G makes calculation with the following equations:

V G , V H , V S :

I G , I H , I S : Current at IED G, IED H, and IED S

Voltage at IED G, IED H, and IED S

Distance ratio of GF to GJ when a fault (F) arises on line GJ

Distance ratio of JF to JH when a fault (F) arises on line JH

Distance ratio of JF to JS when a fault (F) arises on line JS

Section impedance

6F2S1914 (0.49)

GRL200 (Soft 033 & 037)

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