Toshiba GR-200 Series Instruction Manual page 716

10.2.18 Supervision of voltage in zero-sequence (VZ error)
Zero-sequence-phase voltage is automatically calculated with three-phase voltages. If
Equation (10.2-4) is satisfied, the supervision function determines that zero-sequence-phase
voltage is 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 detecting an error, the error message will be shown on the LCD screen. LED will be lit
up.
Table 10.2-35 Error messages provided by the supervisor in CHK_VZ
Message and level
V0 error
Error level
Table 10.2-36 Detailed information in Hexadecimal in CHK_VZ
Display
area
Top
00000001: VZ error is existing
row
Middle
(No information is displayed)
row
Bottom
(No information is displayed)
row
| V
+ V + V
a b
3
Detection of the zero-sequence voltage
Minor error (Level 3)
Meaning of the detailed information
Left column
- 697 -
|
c
≥ 6.35⁡(V)
Meaning of the information
(No information is displayed)
(No information is displayed)
(No information is displayed)
6F2T0200 (0.15)
(10.2-4)
Right column
GRE200 (1,2)