Toshiba GR200 Series Instruction Manual

Also see for GRB200: Instruction manual

6F2S1931 (0.20)Centralized GRB200(Soft: 030, 031, 032, 033, 034)- 484 -9.2.16 Supervision of voltage in negative-sequence (V2 error)Applying the voltage in negative-sequence is calculated regularly using three-phase voltagesmeasured in the IED. If Equation (9.2-2) is satisfied over 10 seconds, the supervision functiondetermines that a failure occurs in the input circuit.The voltage in negative sequence can be used to detect a failure within the voltage inputcircuit in high sensitivity. It facilitates the detection of the incorrect phase sequence if cablesare connected irregularly.1. |Va + 𝑎2Vb + aVc|3 ≥ 6.35 (V) (9.2-2)where,a = Phase shift operator of 120(i) Error levelThe default error level is set at level 3 (Minor error), but the user can program the level usingsetting [CHK_V2:LVl]; then, set On for the setting [CHK_V2:Sw]. The time for the detectioncan be set using [CHK_V2:Timer], which is set for 15 seconds as default. After the error iscleared, it is reset in the time that is the same as the setting time to the detection.(ii) Error messageWhen detecting an error, an error message can be shown on the LCD screen and an LED is lit.Table 9.2-32 Error messages provided by the supervisor in CHK_V2_CBPMessage and level Meaning of the informationV2 error Detection of the negative-sequence voltageError level Minor error (Level 3)Table 9.2-33 Detailed information in Hexadecimal in CHK_V2_CBPDisplayareaMeaning of the detailed informationLeft column Right columnTop row10000000: ZoneA01000000: ZoneB00100000: ZoneC00010000: ZoneD00001000: ZoneE00000100: ZoneF00000001: ORed state in all zonesMiddle row (No information displayed) (No information displayed)Bottom row (No information displayed) (No information displayed)