Toshiba GR200 Series Instruction Manual page 498

Centralized busbar protection ied

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Supervision of voltage in negative-sequence (V2 error)

Applying the voltage in negative-sequence is calculated regularly using three-phase voltages

measured in the IED. If Equation (9.2-2) is satisfied over 10 seconds, the supervision function

determines that a failure occurs in the input circuit.

The voltage in negative sequence can be used to detect a failure within the voltage input

circuit in high sensitivity. It facilitates the detection of the incorrect phase sequence if cables

are connected irregularly.

a = Phase shift operator of 120

The default error level is set at level 3 (Minor error), but the user can program the level using

setting [CHK_V2:LVl]; then, set On for the setting [CHK_V2:Sw]. The time for the detection

can be set using [CHK_V2:Timer], which is set for 15 seconds as default. After the error is

cleared, it is reset in the time that is the same as the setting time to the detection.

Error message

When 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_CBP

Message and level

Table 9.2-33 Detailed information in Hexadecimal in CHK_V2_CBP

Meaning of the information

Detection of the negative-sequence voltage

Meaning of the detailed information

(No information displayed)

Minor error (Level 3)

Right column

00000001: ORed state in all zones

(No information displayed)

6F2S1931 (0.20)

Centralized GRB200

(Soft: 030, 031, 032, 033, 034)

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