Toshiba GR-200-5 Instruction Manual

Also see for GR 200 Series: Instruction manual Instruction manual Instruction manual Instruction manual Instruction manual

6F2T0207 (0.01)GRE200 (5,6)- 119 -2.8.2 Characteristic and settingThe hatched area of Figure 2.8-2 illustrates the BCD characteristic; the BCD function willoperate when the positive sequence current (I1) is larger than 0.04×In, the negative sequencecurrent (I2) is larger than 0.01×In, and the ratio |I2/I1| is higher than setting [BCD].Figure 2.8-2 Characteristic of BCD2.8.3 Miscellaneous functions(i) Harmonic detection functionThe operation of BCD can be blocked when the IED detects 2nd harmonic caused by thephenomenon of magnetizing inrush current when a transformer is energized. To block theoperation of the BCD function during the occurrence of the harmonic, set scheme switch [BCD-2fBlk] Block.(ii) Block operation of CTF for BCDThe operation of the BCD function can be blocked by the current transformer failure (CTF)function using a scheme switch. Block is set for scheme switch [BCD-CTFBlk] if the user wishesto disable the operation of the BCD function when a current transformer failure occurs.I1I20.01×In0.04×Ino|𝐼2||𝐼1|൘ ≥ 𝐵𝐶𝐷 𝑠𝑒𝑡𝑡𝑖𝑛𝑔|𝐼1| ≥ 0.04 × 𝐼𝑛|𝐼2| ≥ 0.01 × 𝐼𝑛& BCD