Toshiba GR200 Series Instruction Manual page 1112

10.2.18 Supervision of voltage in zero-sequence (VZ error)
Voltage in zero-sequence is automatically calculated using three-phase voltages measured in
the relay. If Equation (10.2-4) is made up, the supervision function can determine that a voltage
in zero-sequence is being applied erroneously.
1.
Error level
(i)
Generally, the default error level has been set at level 3 (Minor error), but the user can program
the level using setting [CHK_VZ:LVl]; then, set On for the setting [CHK_VZ:Sw]. The time for
the detection can be set using [CHK_VZ: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
(ii)
When the function operates and detects error, an error message can be shown at the LED and
the LCD screen.
Table 10.2-37 Error messages provided by the supervisor in CHK_VZ
Message and level
V0 error
Error level
Table 10.2-38 Detailed information in Hexadecimal in CHK_VZ
Display area
N/A
| V |
+ V + V
a b c
≥ 6.35 (V)
3
Meaning of the information
Detection of the zero-sequence voltage
Minor error (Level 3)
Meaning of the detailed information
(No information is displayed)
- 1091 -
6F2S1915 (0.46)
(10.2-4)
GRZ200 (Soft 031 & 032)